NEWS revision 1.4
1 This file contains information about GCC releases which has been generated 2 automatically from the online release notes. It covers releases of GCC 3 (and the former EGCS project) since EGCS 1.0, on the line of development 4 that led to GCC 3. For information on GCC 2.8.1 and older releases of GCC 2, 5 see ONEWS. 6 7 ====================================================================== 8 http://gcc.gnu.org/gcc-4.8/index.html 9 10 GCC 4.8 Release Series 11 12 June 23, 2015 13 14 The [1]GNU project and the GCC developers are pleased to announce the 15 release of GCC 4.8.5. 16 17 This release is a bug-fix release, containing fixes for regressions in 18 GCC 4.8.4 relative to previous releases of GCC. 19 20 Release History 21 22 GCC 4.8.5 23 June 23, 2015 ([2]changes, [3]documentation) 24 25 GCC 4.8.4 26 December 19, 2014 ([4]changes, [5]documentation) 27 28 GCC 4.8.3 29 May 22, 2014 ([6]changes, [7]documentation) 30 31 GCC 4.8.2 32 October 16, 2013 ([8]changes, [9]documentation) 33 34 GCC 4.8.1 35 May 31, 2013 ([10]changes, [11]documentation) 36 37 GCC 4.8.0 38 March 22, 2013 ([12]changes, [13]documentation) 39 40 References and Acknowledgements 41 42 GCC used to stand for the GNU C Compiler, but since the compiler 43 supports several other languages aside from C, it now stands for the 44 GNU Compiler Collection. 45 46 A list of [14]successful builds is updated as new information becomes 47 available. 48 49 The GCC developers would like to thank the numerous people that have 50 contributed new features, improvements, bug fixes, and other changes as 51 well as test results to GCC. This [15]amazing group of volunteers is 52 what makes GCC successful. 53 54 For additional information about GCC please refer to the [16]GCC 55 project web site or contact the [17]GCC development mailing list. 56 57 To obtain GCC please use [18]our mirror sites or [19]our SVN server. 58 59 60 For questions related to the use of GCC, please consult these web 61 pages and the [20]GCC manuals. If that fails, the 62 [21]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 63 web pages and the development of GCC are welcome on our developer 64 list at [22]gcc (a] gcc.gnu.org. All of [23]our lists have public 65 archives. 66 67 Copyright (C) [24]Free Software Foundation, Inc. Verbatim copying and 68 distribution of this entire article is permitted in any medium, 69 provided this notice is preserved. 70 71 These pages are [25]maintained by the GCC team. Last modified 72 2015-06-23[26]. 73 74 References 75 76 1. http://www.gnu.org/ 77 2. http://gcc.gnu.org/gcc-4.8/changes.html 78 3. https://gcc.gnu.org/onlinedocs/4.8.5/ 79 4. http://gcc.gnu.org/gcc-4.8/changes.html 80 5. https://gcc.gnu.org/onlinedocs/4.8.4/ 81 6. http://gcc.gnu.org/gcc-4.8/changes.html 82 7. https://gcc.gnu.org/onlinedocs/4.8.3/ 83 8. http://gcc.gnu.org/gcc-4.8/changes.html 84 9. https://gcc.gnu.org/onlinedocs/4.8.2/ 85 10. http://gcc.gnu.org/gcc-4.8/changes.html 86 11. https://gcc.gnu.org/onlinedocs/4.8.1/ 87 12. http://gcc.gnu.org/gcc-4.8/changes.html 88 13. https://gcc.gnu.org/onlinedocs/4.8.0/ 89 14. http://gcc.gnu.org/gcc-4.8/buildstat.html 90 15. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 91 16. http://gcc.gnu.org/index.html 92 17. mailto:gcc (a] gcc.gnu.org 93 18. http://gcc.gnu.org/mirrors.html 94 19. http://gcc.gnu.org/svn.html 95 20. https://gcc.gnu.org/onlinedocs/ 96 21. mailto:gcc-help (a] gcc.gnu.org 97 22. mailto:gcc (a] gcc.gnu.org 98 23. https://gcc.gnu.org/lists.html 99 24. http://www.fsf.org/ 100 25. https://gcc.gnu.org/about.html 101 26. http://validator.w3.org/check/referer 102 ====================================================================== 103 http://gcc.gnu.org/gcc-4.8/changes.html 104 105 GCC 4.8 Release Series 106 Changes, New Features, and Fixes 107 108 Caveats 109 110 GCC now uses C++ as its implementation language. This means that to 111 build GCC from sources, you will need a C++ compiler that understands 112 C++ 2003. For more details on the rationale and specific changes, 113 please refer to the [1]C++ conversion page. 114 115 To enable the Graphite framework for loop optimizations you now need 116 CLooG version 0.18.0 and ISL version 0.11.1. Both can be obtained from 117 the [2]GCC infrastructure directory. The installation manual contains 118 more information about requirements to build GCC. 119 120 GCC now uses a more aggressive analysis to derive an upper bound for 121 the number of iterations of loops using constraints imposed by language 122 standards. This may cause non-conforming programs to no longer work as 123 expected, such as SPEC CPU 2006 464.h264ref and 416.gamess. A new 124 option, -fno-aggressive-loop-optimizations, was added to disable this 125 aggressive analysis. In some loops that have known constant number of 126 iterations, but undefined behavior is known to occur in the loop before 127 reaching or during the last iteration, GCC will warn about the 128 undefined behavior in the loop instead of deriving lower upper bound of 129 the number of iterations for the loop. The warning can be disabled with 130 -Wno-aggressive-loop-optimizations. 131 132 On ARM, a bug has been fixed in GCC's implementation of the AAPCS rules 133 for the layout of vectors that could lead to wrong code being 134 generated. Vectors larger than 8 bytes in size are now by default 135 aligned to an 8-byte boundary. This is an ABI change: code that makes 136 explicit use of vector types may be incompatible with binary objects 137 built with older versions of GCC. Auto-vectorized code is not affected 138 by this change. 139 140 On AVR, support has been removed for the command-line option 141 -mshort-calls deprecated in GCC 4.7. 142 143 On AVR, the configure option --with-avrlibc supported since GCC 4.7.2 144 is turned on per default for all non-RTEMS configurations. This option 145 arranges for a better integration of [3]AVR Libc with avr-gcc. For 146 technical details, see [4]PR54461. To turn off the option in non-RTEMS 147 configurations, use --with-avrlibc=no. If the compiler is configured 148 for RTEMS, the option is always turned off. 149 150 More information on porting to GCC 4.8 from previous versions of GCC 151 can be found in the [5]porting guide for this release. 152 153 General Optimizer Improvements (and Changes) 154 155 * DWARF4 is now the default when generating DWARF debug information. 156 When -g is used on a platform that uses DWARF debugging 157 information, GCC will now default to -gdwarf-4 158 -fno-debug-types-section. 159 GDB 7.5, Valgrind 3.8.0 and elfutils 0.154 debug information 160 consumers support DWARF4 by default. Before GCC 4.8 the default 161 version used was DWARF2. To make GCC 4.8 generate an older DWARF 162 version use -g together with -gdwarf-2 or -gdwarf-3. The default 163 for Darwin and VxWorks is still -gdwarf-2 -gstrict-dwarf. 164 * A new general optimization level, -Og, has been introduced. It 165 addresses the need for fast compilation and a superior debugging 166 experience while providing a reasonable level of run-time 167 performance. Overall experience for development should be better 168 than the default optimization level -O0. 169 * A new option -ftree-partial-pre was added to control the partial 170 redundancy elimination (PRE) optimization. This option is enabled 171 by default at the -O3 optimization level, and it makes PRE more 172 aggressive. 173 * The option -fconserve-space has been removed; it was no longer 174 useful on most targets since GCC supports putting variables into 175 BSS without making them common. 176 * The struct reorg and matrix reorg optimizations (command-line 177 options -fipa-struct-reorg and -fipa-matrix-reorg) have been 178 removed. They did not always work correctly, nor did they work with 179 link-time optimization (LTO), hence were only applicable to 180 programs consisting of a single translation unit. 181 * Several scalability bottle-necks have been removed from GCC's 182 optimization passes. Compilation of extremely large functions, e.g. 183 due to the use of the flatten attribute in the "Eigen" C++ linear 184 algebra templates library, is significantly faster than previous 185 releases of GCC. 186 * Link-time optimization (LTO) improvements: 187 + LTO partitioning has been rewritten for better reliability and 188 maintanibility. Several important bugs leading to link 189 failures have been fixed. 190 * Interprocedural optimization improvements: 191 + A new symbol table has been implemented. It builds on existing 192 callgraph and varpool modules and provide a new API. Unusual 193 symbol visibilities and aliases are handled more consistently 194 leading to, for example, more aggressive unreachable code 195 removal with LTO. 196 + The inline heuristic can now bypass limits on the size of of 197 inlined functions when the inlining is particularly 198 profitable. This happens, for example, when loop bounds or 199 array strides get propagated. 200 + Values passed through aggregates (either by value or 201 reference) are now propagated at the inter-procedural level 202 leading to better inlining decisions (for example in the case 203 of Fortran array descriptors) and devirtualization. 204 * [6]AddressSanitizer , a fast memory error detector, has been added 205 and can be enabled via -fsanitize=address. Memory access 206 instructions will be instrumented to detect heap-, stack-, and 207 global-buffer overflow as well as use-after-free bugs. To get nicer 208 stacktraces, use -fno-omit-frame-pointer. The AddressSanitizer is 209 available on IA-32/x86-64/x32/PowerPC/PowerPC64 GNU/Linux and on 210 x86-64 Darwin. 211 * [7]ThreadSanitizer has been added and can be enabled via 212 -fsanitize=thread. Instructions will be instrumented to detect data 213 races. The ThreadSanitizer is available on x86-64 GNU/Linux. 214 * A new local register allocator (LRA) has been implemented, which 215 replaces the 26 year old reload pass and improves generated code 216 quality. For now it is active on the IA-32 and x86-64 targets. 217 * Support for transactional memory has been implemented on the 218 following architectures: IA-32/x86-64, ARM, PowerPC, SH, SPARC, and 219 Alpha. 220 221 New Languages and Language specific improvements 222 223 C family 224 225 * Each diagnostic emitted now includes the original source line and a 226 caret '^' indicating the column. The option 227 -fno-diagnostics-show-caret suppresses this information. 228 * The option -ftrack-macro-expansion=2 is now enabled by default. 229 This allows the compiler to display the macro expansion stack in 230 diagnostics. Combined with the caret information, an example 231 diagnostic showing these two features is: 232 233 t.c:1:94: error: invalid operands to binary < (have `struct mystruct' and `float 234 ') 235 #define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) _ 236 _b = (B); __a < __b ? __b : __a; }) 237 238 ^ 239 t.c:7:7: note: in expansion of macro 'MYMAX' 240 X = MYMAX(P, F); 241 ^ 242 243 * A new -Wsizeof-pointer-memaccess warning has been added (also 244 enabled by -Wall) to warn about suspicious length parameters to 245 certain string and memory built-in functions if the argument uses 246 sizeof. This warning warns e.g. about memset (ptr, 0, sizeof 247 (ptr)); if ptr is not an array, but a pointer, and suggests a 248 possible fix, or about memcpy (&foo, ptr, sizeof (&foo));. 249 * The new option -Wpedantic is an alias for -pedantic, which is now 250 deprecated. The forms -Wno-pedantic, -Werror=pedantic, and 251 -Wno-error=pedantic work in the same way as for any other -W 252 option. One caveat is that -Werror=pedantic is not equivalent to 253 -pedantic-errors, since the latter makes into errors some warnings 254 that are not controlled by -Wpedantic, and the former only affects 255 diagnostics that are disabled when using -Wno-pedantic. 256 * The option -Wshadow no longer warns if a declaration shadows a 257 function declaration, unless the former declares a function or 258 pointer to function, because this is [8]a common and valid case in 259 real-world code. 260 261 C++ 262 263 * G++ now implements the [9]C++11 thread_local keyword; this differs 264 from the GNU __thread keyword primarily in that it allows dynamic 265 initialization and destruction semantics. Unfortunately, this 266 support requires a run-time penalty for references to 267 non-function-local thread_local variables defined in a different 268 translation unit even if they don't need dynamic initialization, so 269 users may want to continue to use __thread for TLS variables with 270 static initialization semantics. 271 If the programmer can be sure that no use of the variable in a 272 non-defining TU needs to trigger dynamic initialization (either 273 because the variable is statically initialized, or a use of the 274 variable in the defining TU will be executed before any uses in 275 another TU), they can avoid this overhead with the 276 -fno-extern-tls-init option. 277 OpenMP threadprivate variables now also support dynamic 278 initialization and destruction by the same mechanism. 279 * G++ now implements the [10]C++11 attribute syntax, e.g. 280 281 [[noreturn]] void f(); 282 283 and also the alignment specifier, e.g. 284 285 alignas(double) int i; 286 287 * G++ now implements [11]C++11 inheriting constructors, e.g. 288 289 struct A { A(int); }; 290 struct B: A { using A::A; }; // defines B::B(int) 291 B b(42); // OK 292 293 * As of GCC 4.8.1, G++ implements the change to decltype semantics 294 from [12]N3276. 295 296 struct A f(); 297 decltype(f()) g(); // OK, return type of f() is not required to be complete. 298 299 * As of GCC 4.8.1, G++ implements [13]C++11 ref-qualifiers, e.g. 300 301 struct A { int f() &; }; 302 int i = A().f(); // error, f() requires an lvalue object 303 304 * G++ now supports a -std=c++1y option for experimentation with 305 features proposed for the next revision of the standard, expected 306 around 2014. Currently the only difference from -std=c++11 is 307 support for return type deduction in normal functions, as proposed 308 in [14]N3386. Status of C++1y features in GCC 4.8 can be found 309 [15]here. 310 * The G++ namespace association extension, __attribute ((strong)), 311 has been deprecated. Inline namespaces should be used instead. 312 * G++ now supports a -fext-numeric-literal option to control whether 313 GNU numeric literal suffixes are accepted as extensions or 314 processed as C++11 user-defined numeric literal suffixes. The flag 315 is on (use suffixes for GNU literals) by default for -std=gnu++*, 316 and -std=c++98. The flag is off (use suffixes for user-defined 317 literals) by default for -std=c++11 and later. 318 319 Runtime Library (libstdc++) 320 321 * [16]Improved experimental support for the new ISO C++ standard, 322 C++11, including: 323 + forward_list meets the allocator-aware container requirements; 324 + this_thread::sleep_for(), this_thread::sleep_until() and 325 this_thread::yield() are defined without requiring the 326 configure option --enable-libstdcxx-time; 327 * Improvements to <random>: 328 + SSE optimized normal_distribution. 329 + Use of hardware RNG instruction for random_device on new x86 330 processors (requires the assembler to support the 331 instruction.) 332 and <ext/random>: 333 + New random number engine simd_fast_mersenne_twister_engine 334 with an optimized SSE implementation. 335 + New random number distributions beta_distribution, 336 normal_mv_distribution, rice_distribution, 337 nakagami_distribution, pareto_distribution, k_distribution, 338 arcsine_distribution, hoyt_distribution. 339 * Added --disable-libstdcxx-verbose configure option to disable 340 diagnostic messages issued when a process terminates abnormally. 341 This may be useful for embedded systems to reduce the size of 342 executables that link statically to the library. 343 344 Fortran 345 346 * Compatibility notice: 347 + Module files: The version of module files (.mod) has been 348 incremented. Fortran MODULEs compiled by earlier GCC versions 349 have to be recompiled, when they are USEd by files compiled 350 with GCC 4.8. GCC 4.8 is not able to read .mod files created 351 by earlier versions; attempting to do so gives an error 352 message. 353 Note: The ABI of the produced assembler data itself has not 354 changed; object files and libraries are fully compatible with 355 older versions except as noted below. 356 + ABI: Some internal names (used in the assembler/object file) 357 have changed for symbols declared in the specification part of 358 a module. If an affected module - or a file using it via use 359 association - is recompiled, the module and all files which 360 directly use such symbols have to be recompiled as well. This 361 change only affects the following kind of module symbols: 362 o Procedure pointers. Note: C-interoperable function 363 pointers (type(c_funptr)) are not affected nor are 364 procedure-pointer components. 365 o Deferred-length character strings. 366 * The [17]BACKTRACE intrinsic subroutine has been added. It shows a 367 backtrace at an arbitrary place in user code; program execution 368 continues normally afterwards. 369 * The [18]-Wc-binding-type warning option has been added (disabled by 370 default). It warns if the a variable might not be C interoperable; 371 in particular, if the variable has been declared using an intrinsic 372 type with default kind instead of using a kind parameter defined 373 for C interoperability in the intrinsic ISO_C_Binding module. 374 Before, this warning was always printed. The -Wc-binding-type 375 option is enabled by -Wall. 376 * The [19]-Wrealloc-lhs and -Wrealloc-lhs-all warning command-line 377 options have been added, which diagnose when code is inserted for 378 automatic (re)allocation of a variable during assignment. This 379 option can be used to decide whether it is safe to use 380 [20]-fno-realloc-lhs. Additionally, it can be used to find 381 automatic (re)allocation in hot loops. (For arrays, replacing 382 "var=" by "var(:)=" disables the automatic reallocation.) 383 * The [21]-Wcompare-reals command-line option has been added. When 384 this is set, warnings are issued when comparing REAL or COMPLEX 385 types for equality and inequality; consider replacing a == b by 386 abs(a -b) < eps with a suitable eps. -Wcompare-reals is enabled by 387 -Wextra. 388 * The [22]-Wtarget-lifetime command-line option has been added 389 (enabled with -Wall), which warns if the pointer in a pointer 390 assignment might outlive its target. 391 * Reading floating point numbers which use "q" for the exponential 392 (such as 4.0q0) is now supported as vendor extension for better 393 compatibility with old data files. It is strongly recommended to 394 use for I/O the equivalent but standard conforming "e" (such as 395 4.0e0). 396 (For Fortran source code, consider replacing the "q" in 397 floating-point literals by a kind parameter (e.g. 4.0e0_qp with a 398 suitable qp). Note that - in Fortran source code - replacing "q" by 399 a simple "e" is not equivalent.) 400 * The GFORTRAN_TMPDIR environment variable for specifying a 401 non-default directory for files opened with STATUS="SCRATCH", is 402 not used anymore. Instead gfortran checks the POSIX/GNU standard 403 TMPDIR environment variable. If TMPDIR is not defined, gfortran 404 falls back to other methods to determine the directory for 405 temporary files as documented in the [23]user manual. 406 * [24]Fortran 2003: 407 + Support for unlimited polymorphic variables (CLASS(*)) has 408 been added. Nonconstant character lengths are not yet 409 supported. 410 * [25]TS 29113: 411 + Assumed types (TYPE(*)) are now supported. 412 + Experimental support for assumed-rank arrays (dimension(..)) 413 has been added. Note that currently gfortran's own array 414 descriptor is used, which is different from the one defined in 415 TS29113, see [26]gfortran's header file or use the [27]Chasm 416 Language Interoperability Tools. 417 418 Go 419 420 * GCC 4.8.2 provides a complete implementation of the Go 1.1.2 421 release. 422 * GCC 4.8.0 and 4.8.1 implement a preliminary version of the Go 1.1 423 release. The library support is not quite complete. 424 * Go has been tested on GNU/Linux and Solaris platforms for various 425 processors including x86, x86_64, PowerPC, SPARC, and Alpha. It may 426 work on other platforms as well. 427 428 New Targets and Target Specific Improvements 429 430 AArch64 431 432 * A new port has been added to support AArch64, the new 64-bit 433 architecture from ARM. Note that this is a separate port from the 434 existing 32-bit ARM port. 435 * The port provides initial support for the Cortex-A53 and the 436 Cortex-A57 processors with the command line options 437 -mcpu=cortex-a53 and -mcpu=cortex-a57. 438 * As of GCC 4.8.4 a workaround for the ARM Cortex-A53 erratum 835769 439 has been added and can be enabled by giving the 440 -mfix-cortex-a53-835769 option. Alternatively it can be enabled by 441 default by configuring GCC with the --enable-fix-cortex-a53-835769 442 option. 443 444 ARM 445 446 * Initial support has been added for the AArch32 extensions defined 447 in the ARMv8 architecture. 448 * Code generation improvements for the Cortex-A7 and Cortex-A15 CPUs. 449 * A new option, -mcpu=marvell-pj4, has been added to generate code 450 for the Marvell PJ4 processor. 451 * The compiler can now automatically generate the VFMA, VFMS, REVSH 452 and REV16 instructions. 453 * A new vectorizer cost model for Advanced SIMD configurations to 454 improve the auto-vectorization strategies used. 455 * The scheduler now takes into account the number of live registers 456 to reduce the amount of spilling that can occur. This should 457 improve code performance in large functions. The limit can be 458 removed by using the option -fno-sched-pressure. 459 * Improvements have been made to the Marvell iWMMX code generation 460 and support for the iWMMX2 SIMD unit has been added. The option 461 -mcpu=iwmmxt2 can be used to enable code generation for the latter. 462 * A number of code generation improvements for Thumb2 to reduce code 463 size when compiling for the M-profile processors. 464 * The RTEMS (arm-rtems) port has been updated to use the EABI. 465 * Code generation support for the old FPA and Maverick floating-point 466 architectures has been removed. Ports that previously relied on 467 these features have also been removed. This includes the targets: 468 + arm*-*-linux-gnu (use arm*-*-linux-gnueabi) 469 + arm*-*-elf (use arm*-*-eabi) 470 + arm*-*-uclinux* (use arm*-*-uclinux*eabi) 471 + arm*-*-ecos-elf (no alternative) 472 + arm*-*-freebsd (no alternative) 473 + arm*-wince-pe* (no alternative). 474 475 AVR 476 477 * Support for the "Embedded C" fixed-point has been added. For 478 details, see the [28]GCC wiki and the [29]user manual. The support 479 is not complete. 480 * A new print modifier %r for register operands in inline assembler 481 is supported. It will print the raw register number without the 482 register prefix 'r': 483 /* Return the most significant byte of 'val', a 64-bit value. */ 484 485 unsigned char msb (long long val) 486 { 487 unsigned char c; 488 __asm__ ("mov %0, %r1+7" : "=r" (c) : "r" (val)); 489 return c; 490 } 491 The inline assembler in this example will generate code like 492 mov r24, 8+7 493 provided c is allocated to R24 and val is allocated to R8...R15. 494 This works because the GNU assembler accepts plain register numbers 495 without register prefix. 496 * Static initializers with 3-byte symbols are supported now: 497 extern const __memx char foo; 498 const __memx void *pfoo = &foo; 499 This requires at least Binutils 2.23. 500 501 IA-32/x86-64 502 503 * Allow -mpreferred-stack-boundary=3 for the x86-64 architecture with 504 SSE extensions disabled. Since the x86-64 ABI requires 16 byte 505 stack alignment, this is ABI incompatible and intended to be used 506 in controlled environments where stack space is an important 507 limitation. This option will lead to wrong code when functions 508 compiled with 16 byte stack alignment (such as functions from a 509 standard library) are called with misaligned stack. In this case, 510 SSE instructions may lead to misaligned memory access traps. In 511 addition, variable arguments will be handled incorrectly for 16 512 byte aligned objects (including x87 long double and __int128), 513 leading to wrong results. You must build all modules with 514 -mpreferred-stack-boundary=3, including any libraries. This 515 includes the system libraries and startup modules. 516 * Support for the new Intel processor codename Broadwell with RDSEED, 517 ADCX, ADOX, PREFETCHW is available through -madx, -mprfchw, 518 -mrdseed command-line options. 519 * Support for the Intel RTM and HLE intrinsics, built-in functions 520 and code generation is available via -mrtm and -mhle. 521 * Support for the Intel FXSR, XSAVE and XSAVEOPT instruction sets. 522 Intrinsics and built-in functions are available via -mfxsr, -mxsave 523 and -mxsaveopt respectively. 524 * New -maddress-mode=[short|long] options for x32. 525 -maddress-mode=short overrides default 64-bit addresses to 32-bit 526 by emitting the 0x67 address-size override prefix. This is the 527 default address mode for x32. 528 * New built-in functions to detect run-time CPU type and ISA: 529 + A built-in function __builtin_cpu_is has been added to detect 530 if the run-time CPU is of a particular type. It returns a 531 positive integer on a match and zero otherwise. It accepts one 532 string literal argument, the CPU name. For example, 533 __builtin_cpu_is("westmere") returns a positive integer if the 534 run-time CPU is an Intel Core i7 Westmere processor. Please 535 refer to the [30]user manual for the list of valid CPU names 536 recognized. 537 + A built-in function __builtin_cpu_supports has been added to 538 detect if the run-time CPU supports a particular ISA feature. 539 It returns a positive integer on a match and zero otherwise. 540 It accepts one string literal argument, the ISA feature. For 541 example, __builtin_cpu_supports("ssse3") returns a positive 542 integer if the run-time CPU supports SSSE3 instructions. 543 Please refer to the [31]user manual for the list of valid ISA 544 names recognized. 545 Caveat: If these built-in functions are called before any static 546 constructors are invoked, like during IFUNC initialization, then 547 the CPU detection initialization must be explicitly run using this 548 newly provided built-in function, __builtin_cpu_init. The 549 initialization needs to be done only once. For example, this is how 550 the invocation would look like inside an IFUNC initializer: 551 static void (*some_ifunc_resolver(void))(void) 552 { 553 __builtin_cpu_init(); 554 if (__builtin_cpu_is("amdfam10h") ... 555 if (__builtin_cpu_supports("popcnt") ... 556 } 557 558 * Function Multiversioning Support with G++: 559 It is now possible to create multiple function versions each 560 targeting a specific processor and/or ISA. Function versions have 561 the same signature but different target attributes. For example, 562 here is a program with function versions: 563 __attribute__ ((target ("default"))) 564 int foo(void) 565 { 566 return 1; 567 } 568 569 __attribute__ ((target ("sse4.2"))) 570 int foo(void) 571 { 572 return 2; 573 } 574 575 int main (void) 576 { 577 int (*p) = &foo; 578 assert ((*p)() == foo()); 579 return 0; 580 } 581 582 Please refer to this [32]wiki for more information. 583 * The x86 back end has been improved to allow option -fschedule-insns 584 to work reliably. This option can be used to schedule instructions 585 better and leads to improved performace in certain cases. 586 * Windows MinGW-w64 targets (*-w64-mingw*) require at least r5437 587 from the Mingw-w64 trunk. 588 * Support for new AMD family 15h processors (Steamroller core) is now 589 available through the -march=bdver3 and -mtune=bdver3 options. 590 * Support for new AMD family 16h processors (Jaguar core) is now 591 available through the -march=btver2 and -mtune=btver2 options. 592 593 FRV 594 595 * This target now supports the -fstack-usage command-line option. 596 597 MIPS 598 599 * GCC can now generate code specifically for the R4700, Broadcom XLP 600 and MIPS 34kn processors. The associated -march options are 601 -march=r4700, -march=xlp and -march=34kn respectively. 602 * GCC now generates better DSP code for MIPS 74k cores thanks to 603 further scheduling optimizations. 604 * The MIPS port now supports the -fstack-check option. 605 * GCC now passes the -mmcu and -mno-mcu options to the assembler. 606 * Previous versions of GCC would silently accept -fpic and -fPIC for 607 -mno-abicalls targets like mips*-elf. This combination was not 608 intended or supported, and did not generate position-independent 609 code. GCC 4.8 now reports an error when this combination is used. 610 611 PowerPC / PowerPC64 / RS6000 612 613 * SVR4 configurations (GNU/Linux, FreeBSD, NetBSD) no longer save, 614 restore or update the VRSAVE register by default. The respective 615 operating systems manage the VRSAVE register directly. 616 * Large TOC support has been added for AIX through the command line 617 option -mcmodel=large. 618 * Native Thread-Local Storage support has been added for AIX. 619 * VMX (Altivec) and VSX instruction sets now are enabled implicitly 620 when targetting processors that support those hardware features on 621 AIX 6.1 and above. 622 623 RX 624 625 * This target will now issue a warning message whenever multiple fast 626 interrupt handlers are found in the same compilation unit. This 627 feature can be turned off by the new 628 -mno-warn-multiple-fast-interrupts command-line option. 629 630 S/390, System z 631 632 * Support for the IBM zEnterprise zEC12 processor has been added. 633 When using the -march=zEC12 option, the compiler will generate code 634 making use of the following new instructions: 635 + load and trap instructions 636 + 2 new compare and trap instructions 637 + rotate and insert selected bits - without CC clobber 638 The -mtune=zEC12 option enables zEC12 specific instruction 639 scheduling without making use of new instructions. 640 * Register pressure sensitive instruction scheduling is enabled by 641 default. 642 * The ifunc function attribute is enabled by default. 643 * memcpy and memcmp invokations on big memory chunks or with run time 644 lengths are not generated inline anymore when tuning for z10 or 645 higher. The purpose is to make use of the IFUNC optimized versions 646 in Glibc. 647 648 SH 649 650 * The default alignment settings have been reduced to be less 651 aggressive. This results in more compact code for optimization 652 levels other than -Os. 653 * Improved support for the __atomic built-in functions: 654 + A new option -matomic-model=model selects the model for the 655 generated atomic sequences. The following models are 656 supported: 657 658 soft-gusa 659 Software gUSA sequences (SH3* and SH4* only). On 660 SH4A targets this will now also partially utilize 661 the movco.l and movli.l instructions. This is the 662 default when the target is sh3*-*-linux* or 663 sh4*-*-linux*. 664 665 hard-llcs 666 Hardware movco.l / movli.l sequences (SH4A only). 667 668 soft-tcb 669 Software thread control block sequences. 670 671 soft-imask 672 Software interrupt flipping sequences (privileged 673 mode only). This is the default when the target is 674 sh1*-*-linux* or sh2*-*-linux*. 675 676 none 677 Generates function calls to the respective __atomic 678 built-in functions. This is the default for SH64 679 targets or when the target is not sh*-*-linux*. 680 681 + The option -msoft-atomic has been deprecated. It is now an 682 alias for -matomic-model=soft-gusa. 683 + A new option -mtas makes the compiler generate the tas.b 684 instruction for the __atomic_test_and_set built-in function 685 regardless of the selected atomic model. 686 + The __sync functions in libgcc now reflect the selected atomic 687 model when building the toolchain. 688 * Added support for the mov.b and mov.w instructions with 689 displacement addressing. 690 * Added support for the SH2A instructions movu.b and movu.w. 691 * Various improvements to code generated for integer arithmetic. 692 * Improvements to conditional branches and code that involves the T 693 bit. A new option -mzdcbranch tells the compiler to favor 694 zero-displacement branches. This is enabled by default for SH4* 695 targets. 696 * The pref instruction will now be emitted by the __builtin_prefetch 697 built-in function for SH3* targets. 698 * The fmac instruction will now be emitted by the fmaf standard 699 function and the __builtin_fmaf built-in function. 700 * The -mfused-madd option has been deprecated in favor of the 701 machine-independent -ffp-contract option. Notice that the fmac 702 instruction will now be generated by default for expressions like a 703 * b + c. This is due to the compiler default setting 704 -ffp-contract=fast. 705 * Added new options -mfsrra and -mfsca to allow the compiler using 706 the fsrra and fsca instructions on targets other than SH4A (where 707 they are already enabled by default). 708 * Added support for the __builtin_bswap32 built-in function. It is 709 now expanded as a sequence of swap.b and swap.w instructions 710 instead of a library function call. 711 * The behavior of the -mieee option has been fixed and the negative 712 form -mno-ieee has been added to control the IEEE conformance of 713 floating point comparisons. By default -mieee is now enabled and 714 the option -ffinite-math-only implicitly sets -mno-ieee. 715 * Added support for the built-in functions __builtin_thread_pointer 716 and __builtin_set_thread_pointer. This assumes that GBR is used to 717 hold the thread pointer of the current thread. Memory loads and 718 stores relative to the address returned by __builtin_thread_pointer 719 will now also utilize GBR based displacement address modes. 720 * The -mdiv= option for targets other than SHmedia has been fixed and 721 documented. 722 723 SPARC 724 725 * Added optimized instruction scheduling for Niagara4. 726 727 TILE-Gx 728 729 * Added support for the -mcmodel=MODEL command-line option. The 730 models supported are small and large. 731 732 V850 733 734 * This target now supports the E3V5 architecture via the use of the 735 new -mv850e3v5 command-line option. It also has experimental 736 support for the e3v5 LOOP instruction which can be enabled via the 737 new -mloop command-line option. 738 739 XStormy16 740 741 * This target now supports the -fstack-usage command-line option. 742 743 Operating Systems 744 745 Windows (Cygwin) 746 747 * Executables are now linked against shared libgcc by default. The 748 previous default was to link statically, which can still be done by 749 explicitly specifying -static or static-libgcc on the command line. 750 However it is strongly advised against, as it will cause problems 751 for any application that makes use of DLLs compiled by GCC. It 752 should be alright for a monolithic stand-alone application that 753 only links against the Windows DLLs, but offers little or no 754 benefit. 755 756 GCC 4.8.1 757 758 This is the [33]list of problem reports (PRs) from GCC's bug tracking 759 system that are known to be fixed in the 4.8.1 release. This list might 760 not be complete (that is, it is possible that some PRs that have been 761 fixed are not listed here). 762 763 The C++11 <chrono> std::chrono::system_clock and 764 std::chrono::steady_clock classes have changed ABI in GCC 4.8.1, they 765 both are now separate (never typedefs of each other), both use 766 std::chrono::nanoseconds resolution, on most GNU/Linux configurations 767 std::chrono::steady_clock is now finally monotonic, and both classes 768 are mangled differently than in the previous GCC releases. 769 std::chrono::system_clock::now() with std::chrono::microseconds resp. 770 std::chrono::seconds resolution is still exported for backwards 771 compatibility with default configured libstdc++. Note that libstdc++ 772 configured with --enable-libstdcxx-time= used to be ABI incompatible 773 with default configured libstdc++ for those two classes and no ABI 774 compatibility can be offered for those configurations, so any C++11 775 code that uses those classes and has been compiled and linked against 776 libstdc++ configured with the non-default --enable-libstdcxx-time= 777 configuration option needs to be recompiled. 778 779 GCC 4.8.2 780 781 This is the [34]list of problem reports (PRs) from GCC's bug tracking 782 system that are known to be fixed in the 4.8.2 release. This list might 783 not be complete (that is, it is possible that some PRs that have been 784 fixed are not listed here). 785 786 GCC 4.8.3 787 788 This is the [35]list of problem reports (PRs) from GCC's bug tracking 789 system that are known to be fixed in the 4.8.3 release. This list might 790 not be complete (that is, it is possible that some PRs that have been 791 fixed are not listed here). 792 793 Support for the new powerpc64le-linux platform has been added. It 794 defaults to generating code that conforms to the ELFV2 ABI. 795 796 GCC 4.8.4 797 798 This is the [36]list of problem reports (PRs) from GCC's bug tracking 799 system that are known to be fixed in the 4.8.4 release. This list might 800 not be complete (that is, it is possible that some PRs that have been 801 fixed are not listed here). 802 803 GCC 4.8.5 804 805 This is the [37]list of problem reports (PRs) from GCC's bug tracking 806 system that are known to be fixed in the 4.8.5 release. This list might 807 not be complete (that is, it is possible that some PRs that have been 808 fixed are not listed here). 809 810 811 For questions related to the use of GCC, please consult these web 812 pages and the [38]GCC manuals. If that fails, the 813 [39]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 814 web pages and the development of GCC are welcome on our developer 815 list at [40]gcc (a] gcc.gnu.org. All of [41]our lists have public 816 archives. 817 818 Copyright (C) [42]Free Software Foundation, Inc. Verbatim copying and 819 distribution of this entire article is permitted in any medium, 820 provided this notice is preserved. 821 822 These pages are [43]maintained by the GCC team. Last modified 823 2015-06-23[44]. 824 825 References 826 827 1. https://gcc.gnu.org/wiki/cxx-conversion 828 2. ftp://gcc.gnu.org/pub/gcc/infrastructure/ 829 3. http://www.nongnu.org/avr-libc/ 830 4. https://gcc.gnu.org/PR54461 831 5. https://gcc.gnu.org/gcc-4.8/porting_to.html 832 6. https://code.google.com/p/address-sanitizer/ 833 7. https://code.google.com/p/data-race-test/wiki/ThreadSanitizer 834 8. https://lkml.org/lkml/2006/11/28/239 835 9. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 836 10. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 837 11. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 838 12. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf 839 13. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 840 14. http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3386.html 841 15. http://gcc.gnu.org/projects/cxx1y.html 842 16. https://gcc.gnu.org/onlinedocs/gcc-4.8.4/libstdc++/manual/manual/status.html#status.iso.2011 843 17. https://gcc.gnu.org/onlinedocs/gfortran/BACKTRACE.html 844 18. https://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 845 19. https://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 846 20. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html 847 21. https://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 848 22. https://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 849 23. https://gcc.gnu.org/onlinedocs/gfortran/TMPDIR.html 850 24. https://gcc.gnu.org/wiki/Fortran2003Status 851 25. https://gcc.gnu.org/wiki/TS29113Status 852 26. https://gcc.gnu.org/viewcvs/trunk/libgfortran/libgfortran.h?content-type=text%2Fplain&view=co 853 27. http://chasm-interop.sourceforge.net/ 854 28. https://gcc.gnu.org/wiki/avr-gcc#Fixed-Point_Support 855 29. https://gcc.gnu.org/onlinedocs/gcc/Fixed-Point.html 856 30. https://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html#X86-Built-in-Functions 857 31. https://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html#X86-Built-in-Functions 858 32. https://gcc.gnu.org/wiki/FunctionMultiVersioning 859 33. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.1 860 34. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.2 861 35. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.3 862 36. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.4 863 37. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.5 864 38. https://gcc.gnu.org/onlinedocs/ 865 39. mailto:gcc-help (a] gcc.gnu.org 866 40. mailto:gcc (a] gcc.gnu.org 867 41. https://gcc.gnu.org/lists.html 868 42. http://www.fsf.org/ 869 43. https://gcc.gnu.org/about.html 870 44. http://validator.w3.org/check/referer 871 ====================================================================== 872 http://gcc.gnu.org/gcc-4.7/index.html 873 874 GCC 4.7 Release Series 875 876 June 12, 2014 877 878 The [1]GNU project and the GCC developers are pleased to announce the 879 release of GCC 4.7.4. 880 881 This release is a bug-fix release, containing fixes for regressions in 882 GCC 4.7.3 relative to previous releases of GCC. 883 884 Release History 885 886 GCC 4.7.4 887 June 12, 2014 ([2]changes, [3]documentation) 888 889 GCC 4.7.3 890 April 11, 2013 ([4]changes, [5]documentation) 891 892 GCC 4.7.2 893 September 20, 2012 ([6]changes, [7]documentation) 894 895 GCC 4.7.1 896 June 14, 2012 ([8]changes, [9]documentation) 897 898 GCC 4.7.0 899 March 22, 2012 ([10]changes, [11]documentation) 900 901 References and Acknowledgements 902 903 GCC used to stand for the GNU C Compiler, but since the compiler 904 supports several other languages aside from C, it now stands for the 905 GNU Compiler Collection. 906 907 A list of [12]successful builds is updated as new information becomes 908 available. 909 910 The GCC developers would like to thank the numerous people that have 911 contributed new features, improvements, bug fixes, and other changes as 912 well as test results to GCC. This [13]amazing group of volunteers is 913 what makes GCC successful. 914 915 For additional information about GCC please refer to the [14]GCC 916 project web site or contact the [15]GCC development mailing list. 917 918 To obtain GCC please use [16]our mirror sites or [17]our SVN server. 919 920 921 For questions related to the use of GCC, please consult these web 922 pages and the [18]GCC manuals. If that fails, the 923 [19]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 924 web pages and the development of GCC are welcome on our developer 925 list at [20]gcc (a] gcc.gnu.org. All of [21]our lists have public 926 archives. 927 928 Copyright (C) [22]Free Software Foundation, Inc. Verbatim copying and 929 distribution of this entire article is permitted in any medium, 930 provided this notice is preserved. 931 932 These pages are [23]maintained by the GCC team. Last modified 933 2014-06-12[24]. 934 935 References 936 937 1. http://www.gnu.org/ 938 2. http://gcc.gnu.org/gcc-4.7/changes.html 939 3. https://gcc.gnu.org/onlinedocs/4.7.4/ 940 4. http://gcc.gnu.org/gcc-4.7/changes.html 941 5. https://gcc.gnu.org/onlinedocs/4.7.3/ 942 6. http://gcc.gnu.org/gcc-4.7/changes.html 943 7. https://gcc.gnu.org/onlinedocs/4.7.2/ 944 8. http://gcc.gnu.org/gcc-4.7/changes.html 945 9. https://gcc.gnu.org/onlinedocs/4.7.1/ 946 10. http://gcc.gnu.org/gcc-4.7/changes.html 947 11. https://gcc.gnu.org/onlinedocs/4.7.0/ 948 12. http://gcc.gnu.org/gcc-4.7/buildstat.html 949 13. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 950 14. http://gcc.gnu.org/index.html 951 15. mailto:gcc (a] gcc.gnu.org 952 16. http://gcc.gnu.org/mirrors.html 953 17. http://gcc.gnu.org/svn.html 954 18. https://gcc.gnu.org/onlinedocs/ 955 19. mailto:gcc-help (a] gcc.gnu.org 956 20. mailto:gcc (a] gcc.gnu.org 957 21. https://gcc.gnu.org/lists.html 958 22. http://www.fsf.org/ 959 23. https://gcc.gnu.org/about.html 960 24. http://validator.w3.org/check/referer 961 ====================================================================== 962 http://gcc.gnu.org/gcc-4.7/changes.html 963 964 GCC 4.7 Release Series 965 Changes, New Features, and Fixes 966 967 Caveats 968 969 * The -fconserve-space flag has been deprecated. The flag had no 970 effect for most targets: only targets without a global .bss section 971 and without support for switchable sections. Furthermore, the flag 972 only had an effect for G++, where it could result in wrong 973 semantics (please refer to the GCC manual for further details). The 974 flag will be removed in GCC 4.8 975 * Support for a number of older systems and recently unmaintained or 976 untested target ports of GCC has been declared obsolete in GCC 4.7. 977 Unless there is activity to revive them, the next release of GCC 978 will have their sources permanently removed. 979 All GCC ports for the following processor architectures have been 980 declared obsolete: 981 + picoChip (picochip-*) 982 The following ports for individual systems on particular 983 architectures have been obsoleted: 984 + IRIX 6.5 (mips-sgi-irix6.5) 985 + MIPS OpenBSD (mips*-*-openbsd*) 986 + Solaris 8 (*-*-solaris2.8). Details can be found in the 987 [1]announcement. 988 + Tru64 UNIX V5.1 (alpha*-dec-osf5.1*) 989 * On ARM, when compiling for ARMv6 (but not ARMv6-M), ARMv7-A, 990 ARMv7-R, or ARMv7-M, the new option -munaligned-access is active by 991 default, which for some sources generates code that accesses memory 992 on unaligned addresses. This requires the kernel of those systems 993 to enable such accesses (controlled by CP15 register c1, refer to 994 ARM documentation). Alternatively, or for compatibility with 995 kernels where unaligned accesses are not supported, all code has to 996 be compiled with -mno-unaligned-access. Upstream Linux kernel 997 releases have automatically and unconditionally supported unaligned 998 accesses as emitted by GCC due to this option being active since 999 version 2.6.28. 1000 * Support on ARM for the legacy floating-point accelerator (FPA) and 1001 the mixed-endian floating-point format that it used has been 1002 obsoleted. The ports that still use this format have been obsoleted 1003 as well. Many legacy ARM ports already provide an alternative that 1004 uses the VFP floating-point format. The obsolete ports will be 1005 deleted in the next release. 1006 The obsolete ports with alternatives are: 1007 + arm*-*-rtems (use arm*-*-rtemseabi) 1008 + arm*-*-linux-gnu (use arm*-*-linux-gnueabi) 1009 + arm*-*-elf (use arm*-*-eabi) 1010 + arm*-*-uclinux* (use arm*-*-uclinux*eabi) 1011 Note, however, that these alternatives are not binary compatible 1012 with their legacy counterparts (although some can support running 1013 legacy applications). 1014 The obsolete ports that currently lack a modern alternative are: 1015 + arm*-*-ecos-elf 1016 + arm*-*-freebsd 1017 + arm*-wince-pe* 1018 New ports that support more recent versions of the architecture are 1019 welcome. 1020 * Support for the Maverick co-processor on ARM has been obsoleted. 1021 Code to support it will be deleted in the next release. 1022 * Support has been removed for Unix International threads on Solaris 1023 2, so the --enable-threads=solaris configure option and the 1024 -threads compiler option don't work any longer. 1025 * Support has been removed for the Solaris BSD Compatibility Package, 1026 which lives in /usr/ucbinclude and /usr/ucblib. It has been removed 1027 from Solaris 11, and was only intended as a migration aid from 1028 SunOS 4 to SunOS 5. The -compat-bsd compiler option is not 1029 recognized any longer. 1030 * The AVR port's libgcc has been improved and its multilib structure 1031 has been enhanced. As a result, all objects contributing to an 1032 application must either be compiled with GCC versions up to 4.6.x 1033 or with GCC versions 4.7.1 or later. If the compiler is used with 1034 AVR Libc, you need a version that supports the new layout, i.e. 1035 implements [2]#35407. 1036 * The AVR port's -mshort-calls command-line option has been 1037 deprecated. It will be removed in the GCC 4.8 release. See -mrelax 1038 for a replacement. 1039 * The AVR port only references startup code that clears .bss and the 1040 common section resp. initializes the .data and .rodata section 1041 provided respective sections (or subsections thereof) are not 1042 empty, see [3]PR18145. Applications that put all static storage 1043 objects into non-standard sections and / or define all static 1044 storage objects in assembler modules, must reference __do_clear_bss 1045 resp. __do_copy_data by hand or undefine the symbol(s) by means of 1046 -Wl,-u,__do_clear_bss resp. -Wl,-u,__do_copy_data. 1047 * The ARM port's -mwords-little-endian option has been deprecated. It 1048 will be removed in a future release. 1049 * Support has been removed for the NetWare x86 configuration 1050 obsoleted in GCC 4.6. 1051 * It is no longer possible to use the "l" constraint in MIPS16 asm 1052 statements. 1053 * GCC versions 4.7.0 and 4.7.1 had changes to the C++ standard 1054 library which affected the ABI in C++11 mode: a data member was 1055 added to std::list changing its size and altering the definitions 1056 of some member functions, and std::pair's move constructor was 1057 non-trivial which altered the calling convention for functions with 1058 std::pair arguments or return types. The ABI incompatibilities have 1059 been fixed for GCC version 4.7.2 but as a result C++11 code 1060 compiled with GCC 4.7.0 or 4.7.1 may be incompatible with C++11 1061 code compiled with different GCC versions and with C++98/C++03 code 1062 compiled with any version. 1063 * On ARM, a bug has been fixed in GCC's implementation of the AAPCS 1064 rules for the layout of vectors that could lead to wrong code being 1065 generated. Vectors larger than 8 bytes in size are now by default 1066 aligned to an 8-byte boundary. This is an ABI change: code that 1067 makes explicit use of vector types may be incompatible with binary 1068 objects built with older versions of GCC. Auto-vectorized code is 1069 not affected by this change. (This change affects GCC versions 1070 4.7.2 and later.) 1071 * More information on porting to GCC 4.7 from previous versions of 1072 GCC can be found in the [4]porting guide for this release. 1073 1074 General Optimizer Improvements 1075 1076 * Support for a new parameter --param case-values-threshold=n was 1077 added to allow users to control the cutoff between doing switch 1078 statements as a series of if statements and using a jump table. 1079 * Link-time optimization (LTO) improvements: 1080 + Improved scalability and reduced memory usage. Link time 1081 optimization of Firefox now requires 3GB of RAM on a 64-bit 1082 system, while over 8GB was needed previously. Linking time has 1083 been improved, too. The serial stage of linking Firefox has 1084 been sped up by about a factor of 10. 1085 + Reduced size of object files and temporary storage used during 1086 linking. 1087 + Streaming performance (both outbound and inbound) has been 1088 improved. 1089 + ld -r is now supported with LTO. 1090 + Several bug fixes, especially in symbol table handling and 1091 merging. 1092 * Interprocedural optimization improvements: 1093 + Heuristics now take into account that after inlining code will 1094 be optimized out because of known values (or properties) of 1095 function parameters. For example: 1096 void foo(int a) 1097 { 1098 if (a > 10) 1099 ... huge code ... 1100 } 1101 void bar (void) 1102 { 1103 foo (0); 1104 } 1105 1106 The call of foo will be inlined into bar even when optimizing 1107 for code size. Constructs based on __builtin_constant_p are 1108 now understood by the inliner and code size estimates are 1109 evaluated a lot more realistically. 1110 + The representation of C++ virtual thunks and aliases (both 1111 implicit and defined via the alias attribute) has been 1112 re-engineered. Aliases no longer pose optimization barriers 1113 and calls to an alias can be inlined and otherwise optimized. 1114 + The inter-procedural constant propagation pass has been 1115 rewritten. It now performs generic function specialization. 1116 For example when compiling the following: 1117 void foo(bool flag) 1118 { 1119 if (flag) 1120 ... do something ... 1121 else 1122 ... do something else ... 1123 } 1124 void bar (void) 1125 { 1126 foo (false); 1127 foo (true); 1128 foo (false); 1129 foo (true); 1130 foo (false); 1131 foo (true); 1132 } 1133 1134 GCC will now produce two copies of foo. One with flag being 1135 true, while other with flag being false. This leads to 1136 performance improvements previously possible only by inlining 1137 all calls. Cloning causes a lot less code size growth. 1138 * A string length optimization pass has been added. It attempts to 1139 track string lengths and optimize various standard C string 1140 functions like strlen, strchr, strcpy, strcat, stpcpy and their 1141 _FORTIFY_SOURCE counterparts into faster alternatives. This pass is 1142 enabled by default at -O2 or above, unless optimizing for size, and 1143 can be disabled by the -fno-optimize-strlen option. The pass can 1144 e.g. optimize 1145 char *bar (const char *a) 1146 { 1147 size_t l = strlen (a) + 2; 1148 char *p = malloc (l); if (p == NULL) return p; 1149 strcpy (p, a); strcat (p, "/"); return p; 1150 } 1151 1152 into: 1153 char *bar (const char *a) 1154 { 1155 size_t tmp = strlen (a); 1156 char *p = malloc (tmp + 2); if (p == NULL) return p; 1157 memcpy (p, a, tmp); memcpy (p + tmp, "/", 2); return p; 1158 } 1159 1160 or for hosted compilations where stpcpy is available in the runtime 1161 and headers provide its prototype, e.g. 1162 void foo (char *a, const char *b, const char *c, const char *d) 1163 { 1164 strcpy (a, b); strcat (a, c); strcat (a, d); 1165 } 1166 1167 can be optimized into: 1168 void foo (char *a, const char *b, const char *c, const char *d) 1169 { 1170 strcpy (stpcpy (stpcpy (a, b), c), d); 1171 } 1172 1173 New Languages and Language specific improvements 1174 1175 * Version 3.1 of the [5]OpenMP specification is now supported for the 1176 C, C++, and Fortran compilers. 1177 1178 Ada 1179 1180 * The command-line option -feliminate-unused-debug-types has been 1181 re-enabled by default, as it is for the other languages, leading to 1182 a reduction in debug info size of 12.5% and more for relevant 1183 cases, as well as to a small compilation speedup. 1184 1185 C family 1186 1187 * A new built-in, __builtin_assume_aligned, has been added, through 1188 which the compiler can be hinted about pointer alignment and can 1189 use it to improve generated code. 1190 * A new warning option -Wunused-local-typedefs was added for C, C++, 1191 Objective-C and Objective-C++. This warning diagnoses typedefs 1192 locally defined in a function, and otherwise not used. 1193 * A new experimental command-line option -ftrack-macro-expansion was 1194 added for C, C++, Objective-C, Objective-C++ and Fortran. It allows 1195 the compiler to emit diagnostic about the current macro expansion 1196 stack when a compilation error occurs in a macro expansion. 1197 * Experimental support for transactional memory has been added. It 1198 includes support in the compiler, as well as a supporting runtime 1199 library called libitm. To compile code with transactional memory 1200 constructs, use the -fgnu-tm option. 1201 Support is currently available for Alpha, ARM, PowerPC, SH, SPARC, 1202 and 32-bit/64-bit x86 platforms. 1203 For more details on transactional memory see [6]the GCC WiKi. 1204 * Support for atomic operations specifying the C++11/C11 memory model 1205 has been added. These new __atomic routines replace the existing 1206 __sync built-in routines. 1207 Atomic support is also available for memory blocks. Lock-free 1208 instructions will be used if a memory block is the same size and 1209 alignment as a supported integer type. Atomic operations which do 1210 not have lock-free support are left as function calls. A set of 1211 library functions is available on the GCC atomic wiki in the 1212 "External Atomics Library" section. 1213 For more details on the memory models and features, see the 1214 [7]atomic wiki. 1215 * When a binary operation is performed on vector types and one of the 1216 operands is a uniform vector, it is possible to replace the vector 1217 with the generating element. For example: 1218 typedef int v4si __attribute__ ((vector_size (16))); 1219 v4si res, a = {1,2,3,4}; 1220 int x; 1221 1222 res = 2 + a; /* means {2,2,2,2} + a */ 1223 res = a - x; /* means a - {x,x,x,x} */ 1224 1225 C 1226 1227 * There is support for some more features from the C11 revision of 1228 the ISO C standard. GCC now accepts the options -std=c11 and 1229 -std=gnu11, in addition to the previous -std=c1x and -std=gnu1x. 1230 + Unicode strings (previously supported only with options such 1231 as -std=gnu11, now supported with -std=c11), and the 1232 predefined macros __STDC_UTF_16__ and __STDC_UTF_32__. 1233 + Nonreturning functions (_Noreturn and <stdnoreturn.h>). 1234 + Alignment support (_Alignas, _Alignof, max_align_t, 1235 <stdalign.h>). 1236 + A built-in function __builtin_complex is provided to support C 1237 library implementation of the CMPLX family of macros. 1238 1239 C++ 1240 1241 * G++ now accepts the -std=c++11, -std=gnu++11, and -Wc++11-compat 1242 options, which are equivalent to -std=c++0x, -std=gnu++0x, and 1243 -Wc++0x-compat, respectively. 1244 * G++ now implements [8]C++11 extended friend syntax: 1245 1246 template<class W> 1247 class Q 1248 { 1249 static const int I = 2; 1250 public: 1251 friend W; 1252 }; 1253 1254 struct B 1255 { 1256 int ar[Q<B>::I]; 1257 }; 1258 1259 * Thanks to Ville Voutilainen, G++ now implements [9]C++11 explicit 1260 override control. 1261 1262 struct B { 1263 virtual void f() const final; 1264 virtual void f(int); 1265 }; 1266 1267 struct D : B { 1268 void f() const; // error: D::f attempts to override final B::f 1269 void f(long) override; // error: doesn't override anything 1270 void f(int) override; // ok 1271 }; 1272 1273 struct E final { }; 1274 struct F: E { }; // error: deriving from final class 1275 1276 * G++ now implements [10]C++11 non-static data member initializers. 1277 1278 struct A { 1279 int i = 42; 1280 } a; // initializes a.i to 42 1281 1282 * Thanks to Ed Smith-Rowland, G++ now implements [11]C++11 1283 user-defined literals. 1284 1285 // Not actually a good approximation. :) 1286 constexpr long double operator"" _degrees (long double d) { return d * 0.0175; } 1287 long double pi = 180.0_degrees; 1288 1289 * G++ now implements [12]C++11 alias-declarations. 1290 1291 template <class T> using Ptr = T*; 1292 Ptr<int> ip; // decltype(ip) is int* 1293 1294 * Thanks to Ville Voutilainen and Pedro Lamarao, G++ now implements 1295 [13]C++11 delegating constructors. 1296 1297 struct A { 1298 A(int); 1299 A(): A(42) { } // delegate to the A(int) constructor 1300 }; 1301 1302 * G++ now fully implements C++11 atomic classes rather than just 1303 integer derived classes. 1304 1305 class POD { 1306 int a; 1307 int b; 1308 }; 1309 std::atomic<POD> my_atomic_POD; 1310 1311 * G++ now sets the predefined macro __cplusplus to the correct value, 1312 199711L for C++98/03, and 201103L for C++11. 1313 * G++ now correctly implements the two-phase lookup rules such that 1314 an unqualified name used in a template must have an appropriate 1315 declaration found either in scope at the point of definition of the 1316 template or by argument-dependent lookup at the point of 1317 instantiation. As a result, code that relies on a second 1318 unqualified lookup at the point of instantiation to find functions 1319 declared after the template or in dependent bases will be rejected. 1320 The compiler will suggest ways to fix affected code, and using the 1321 -fpermissive compiler flag will allow the code to compile with a 1322 warning. 1323 1324 template <class T> 1325 void f() { g(T()); } // error, g(int) not found by argument-dependent lookup 1326 void g(int) { } // fix by moving this declaration before the declaration of f 1327 1328 template <class T> 1329 struct A: T { 1330 // error, B::g(B) not found by argument-dependent lookup 1331 void f() { g(T()); } // fix by using this->g or A::g 1332 }; 1333 1334 struct B { void g(B); }; 1335 1336 int main() 1337 { 1338 f<int>(); 1339 A<B>().f(); 1340 } 1341 1342 * G++ now properly re-uses stack space allocated for temporary 1343 objects when their lifetime ends, which can significantly lower 1344 stack consumption for some C++ functions. As a result of this, some 1345 code with undefined behavior will now break: 1346 1347 const int &f(const int &i) { return i; } 1348 .... 1349 const int &x = f(1); 1350 const int &y = f(2); 1351 1352 Here, x refers to the temporary allocated to hold the 1 argument, 1353 which only lives until the end of the initialization; it 1354 immediately becomes a dangling reference. So the next statement 1355 re-uses the stack slot to hold the 2 argument, and users of x get 1356 that value instead. 1357 Note that this should not cause any change of behavior for 1358 temporaries of types with non-trivial destructors, as they are 1359 already destroyed at end of full-expression; the change is that now 1360 the storage is released as well. 1361 * A new command-line option -Wdelete-non-virtual-dtor has been added 1362 to warn when delete is used to destroy an instance of a class which 1363 has virtual functions and non-virtual destructor. It is unsafe to 1364 delete an instance of a derived class through a pointer to a base 1365 class if the base class does not have a virtual destructor. This 1366 warning is enabled by -Wall. 1367 * A new command-line option -Wzero-as-null-pointer-constant has been 1368 added to warn when a literal '0' is used as null pointer constant. 1369 It can be useful to facilitate the conversion to nullptr in C++11. 1370 * As per C++98, access-declarations are now deprecated by G++. 1371 Using-declarations are to be used instead. Furthermore, some 1372 efforts have been made to improve the support of class scope 1373 using-declarations. In particular, using-declarations referring to 1374 a dependent type now work as expected ([14]bug c++/14258). 1375 * The ELF symbol visibility of a template instantiation is now 1376 properly constrained by the visibility of its template arguments 1377 ([15]bug c++/35688). 1378 1379 Runtime Library (libstdc++) 1380 1381 * [16]Improved experimental support for the new ISO C++ standard, 1382 C++11, including: 1383 + using noexcept in most of the library; 1384 + implementations of pointer_traits, allocator_traits and 1385 scoped_allocator_adaptor; 1386 + uses-allocator construction for tuple; 1387 + vector meets the allocator-aware container requirements; 1388 + replacing monotonic_clock with steady_clock; 1389 + enabling the thread support library on most POSIX targets; 1390 + many small improvements to conform to the FDIS. 1391 * Added --enable-clocale=newlib configure option. 1392 * Debug Mode iterators for unordered associative containers. 1393 * Avoid polluting the global namespace and do not include <unistd.h>. 1394 1395 Fortran 1396 1397 * The compile flag [17]-fstack-arrays has been added, which causes 1398 all local arrays to be put on stack memory. For some programs this 1399 will improve the performance significantly. If your program uses 1400 very large local arrays, it is possible that you will have to 1401 extend your runtime limits for stack memory. 1402 * The [18]-Ofast flag now also implies [19]-fno-protect-parens and 1403 [20]-fstack-arrays. 1404 * Front-end optimizations can now be selected by the 1405 [21]-ffrontend-optimize option and deselected by the 1406 -fno-frontend-optimize option. 1407 * When front-end optimization removes a function call, 1408 [22]-Wfunction-elimination warns about that. 1409 * When performing front-end-optimization, the 1410 [23]-faggressive-function-elimination option allows the removal of 1411 duplicate function calls even for impure functions. 1412 * The flag [24]-Wreal-q-constant has been added, which warns if 1413 floating-point literals have been specified using q (such as 1414 1.0q0); the q marker is now supported as a vendor extension to 1415 denote quad precision (REAL(16) or, if not available, REAL(10)). 1416 Consider using a kind parameter (such as in 1.0_qp) instead, which 1417 can be obtained via [25]SELECTED_REAL_KIND. 1418 * The GFORTRAN_USE_STDERR environment variable has been removed. GNU 1419 Fortran now always prints error messages to standard error. If you 1420 wish to redirect standard error, please consult the manual for your 1421 OS, shell, batch environment etc. as appropriate. 1422 * The -fdump-core option and GFORTRAN_ERROR_DUMPCORE environment 1423 variable have been removed. When encountering a serious error, 1424 gfortran will now always abort the program. Whether a core dump is 1425 generated depends on the user environment settings; see the ulimit 1426 -c setting for POSIX shells, limit coredumpsize for C shells, and 1427 the [26]WER user-mode dumps settings on Windows. 1428 * The [27]-fbacktrace option is now enabled by default. When 1429 encountering a fatal error, gfortran will attempt to print a 1430 backtrace to standard error before aborting. It can be disabled 1431 with -fno-backtrace. Note: On POSIX targets with the addr2line 1432 utility from GNU binutils, GNU Fortran can print a backtrace with 1433 function name, file name, line number information in addition to 1434 the addresses; otherwise only the addresses are printed. 1435 * [28]Fortran 2003: 1436 + Generic interface names which have the same name as derived 1437 types are now supported, which allows to write constructor 1438 functions. Note that Fortran does not support static 1439 constructor functions; only default initialization or an 1440 explicit structure-constructor initialization are available. 1441 + [29]Polymorphic (class) arrays are now supported. 1442 * [30]Fortran 2008: 1443 + Support for the DO CONCURRENT construct has been added, which 1444 allows the user to specify that individual loop iterations 1445 have no interdependencies. 1446 + [31]Coarrays: Full single-image support except for polymorphic 1447 coarrays. Additionally, preliminary support for multiple 1448 images via an MPI-based [32]coarray communication library has 1449 been added. Note: The library version is not yet usable as 1450 remote coarray access is not yet possible. 1451 * [33]TS 29113: 1452 + New flag [34]-std=f2008ts permits programs that are expected 1453 to conform to the Fortran 2008 standard and the draft 1454 Technical Specification (TS) 29113 on Further Interoperability 1455 of Fortran with C. 1456 + The OPTIONAL attribute is now allowed for dummy arguments of 1457 BIND(C) procedures. 1458 + The RANK intrinsic has been added. 1459 + The implementation of the ASYNCHRONOUS attribute in GCC is 1460 compatible with the candidate draft of TS 29113 (since GCC 1461 4.6). 1462 1463 Go 1464 1465 * GCC 4.7 implements the [35]Go 1 language standard. The library 1466 support in 4.7.0 is not quite complete, due to release timing. 1467 Release 4.7.1 includes complete support for Go 1. The Go library is 1468 from the Go 1.0.1 release. 1469 * Go has been tested on GNU/Linux and Solaris platforms. It may work 1470 on other platforms as well. 1471 1472 New Targets and Target Specific Improvements 1473 1474 ARM 1475 1476 * GCC now supports the Cortex-A7 processor implementing the v7-a 1477 version of the architecture using the option -mcpu=cortex-a7. 1478 * The default vector size in auto-vectorization for NEON is now 128 1479 bits. If vectorization fails thusly, the vectorizer tries again 1480 with 64-bit vectors. 1481 * A new option -mvectorize-with-neon-double was added to allow users 1482 to change the vector size to 64 bits. 1483 1484 AVR 1485 1486 * GCC now supports the XMEGA architecture. This requires GNU binutils 1487 2.22 or later. 1488 * Support for the [36]named address spaces __flash, __flash1, ..., 1489 __flash5 and __memx has been added. These address spaces locate 1490 read-only data in flash memory and allow reading from flash memory 1491 by means of ordinary C code, i.e. without the need of (inline) 1492 assembler code: 1493 1494 const __flash int values[] = { 42, 31 }; 1495 1496 int add_values (const __flash int *p, int i) 1497 { 1498 return values[i] + *p; 1499 } 1500 1501 * Support has been added for the AVR-specific configure option 1502 --with-avrlibc=yes in order to arrange for better integration of 1503 [37]AVR-Libc. This configure option is supported in avr-gcc 4.7.2 1504 and newer and will only take effect in non-RTEMS configurations. If 1505 avr-gcc is configured for RTEMS, the option will be ignored which 1506 is the same as specifying --with-avrlibc=no. See [38]PR54461 for 1507 more technical details. 1508 * Support for AVR-specific [39]built-in functions has been added. 1509 * Support has been added for the signed and unsigned 24-bit scalar 1510 integer types __int24 and __uint24. 1511 * New command-line options -maccumulate-args, -mbranch-cost=cost and 1512 -mstrict-X were added to allow better fine-tuning of code 1513 optimization. 1514 * The command option -fdata-sections now also takes affect on the 1515 section names of variables with the progmem attribute. 1516 * A new inline assembler print modifier %i to print a RAM address as 1517 I/O address has been added: 1518 1519 #include <avr/io.h> /* Port Definitions from AVR-LibC */ 1520 1521 void set_portb (uint8_t value) 1522 { 1523 asm volatile ("out %i0, %1" :: "n" (&PORTB), "r" (value) : "memory"); 1524 } 1525 1526 The offset between an I/O address and the RAM address for that I/O 1527 location is device-specific. This offset is taken into account when 1528 printing a RAM address with the %i modifier so that the address is 1529 suitable to be used as operand in an I/O command. The address must 1530 be a constant integer known at compile time. 1531 * The inline assembler constraint "R" to represent integers in the 1532 range -6 ... 5 has been removed without replacement. 1533 * Many optimizations to: 1534 + 64-bit integer arithmetic 1535 + Widening multiplication 1536 + Integer division by a constant 1537 + Avoid constant reloading in multi-byte instructions. 1538 + Micro-optimizations for special instruction sequences. 1539 + Generic built-in functions like __builtin_ffs*, 1540 __builtin_clz*, etc. 1541 + If-else decision trees generated by switch instructions 1542 + Merging of data located in flash memory 1543 + New libgcc variants for devices with 8-bit wide stack pointer 1544 + ... 1545 * Better documentation: 1546 + Handling of EIND and indirect jumps on devices with more than 1547 128 KiB of program memory. 1548 + Handling of the RAMPD, RAMPX, RAMPY and RAMPZ special function 1549 registers. 1550 + Function attributes OS_main and OS_task. 1551 + AVR-specific built-in macros. 1552 1553 C6X 1554 1555 * Support has been added for the Texas Instruments C6X family of 1556 processors. 1557 1558 CR16 1559 1560 * Support has been added for National Semiconductor's CR16 1561 architecture. 1562 1563 Epiphany 1564 1565 * Support has been added for Adapteva's Epiphany architecture. 1566 1567 IA-32/x86-64 1568 1569 * Support for Intel AVX2 intrinsics, built-in functions and code 1570 generation is available via -mavx2. 1571 * Support for Intel BMI2 intrinsics, built-in functions and code 1572 generation is available via -mbmi2. 1573 * Implementation and automatic generation of __builtin_clz* using the 1574 lzcnt instruction is available via -mlzcnt. 1575 * Support for Intel FMA3 intrinsics and code generation is available 1576 via -mfma. 1577 * A new -mfsgsbase command-line option is available that makes GCC 1578 generate new segment register read/write instructions through 1579 dedicated built-ins. 1580 * Support for the new Intel rdrnd instruction is available via 1581 -mrdrnd. 1582 * Two additional AVX vector conversion instructions are available via 1583 -mf16c. 1584 * Support for new Intel processor codename IvyBridge with RDRND, 1585 FSGSBASE and F16C is available through -march=core-avx-i. 1586 * Support for the new Intel processor codename Haswell with AVX2, 1587 FMA, BMI, BMI2, LZCNT is available through -march=core-avx2. 1588 * Support for new AMD family 15h processors (Piledriver core) is now 1589 available through -march=bdver2 and -mtune=bdver2 options. 1590 * Support for [40]the x32 psABI is now available through the -mx32 1591 option. 1592 * Windows mingw targets are using the -mms-bitfields option by 1593 default. 1594 * Windows x86 targets are using the __thiscall calling convention for 1595 C++ class-member functions. 1596 * Support for the configure option --with-threads=posix for Windows 1597 mingw targets. 1598 1599 MIPS 1600 1601 * GCC now supports thread-local storage (TLS) for MIPS16. This 1602 requires GNU binutils 2.22 or later. 1603 * GCC can now generate code specifically for the Cavium Octeon+ and 1604 Octeon2 processors. The associated command-line options are 1605 -march=octeon+ and -march=octeon2 respectively. Both options 1606 require GNU binutils 2.22 or later. 1607 * GCC can now work around certain 24k errata, under the control of 1608 the command-line option -mfix-24k. These workarounds require GNU 1609 binutils 2.20 or later. 1610 * 32-bit MIPS GNU/Linux targets such as mips-linux-gnu can now build 1611 n32 and n64 multilibs. The result is effectively a 64-bit GNU/Linux 1612 toolchain that generates 32-bit code by default. Use the 1613 configure-time option --enable-targets=all to select these extra 1614 multilibs. 1615 * Passing -fno-delayed-branch now also stops the assembler from 1616 automatically filling delay slots. 1617 1618 PowerPC/PowerPC64 1619 1620 * Vectors of type vector long long or vector long are passed and 1621 returned using the same method as other vectors with the VSX 1622 instruction set. Previously GCC did not adhere to the ABI for 1623 128-bit vectors with 64-bit integer base types (PR 48857). This 1624 will also be fixed in the GCC 4.6.1 and 4.5.4 releases. 1625 * A new option -mno-pointers-to-nested-functions was added to allow 1626 AIX 32-bit/64-bit and GNU/Linux 64-bit PowerPC users to specify 1627 that the compiler should not load up the chain register (r11) 1628 before calling a function through a pointer. If you use this 1629 option, you cannot call nested functions through a pointer, or call 1630 other languages that might use the static chain. 1631 * A new option msave-toc-indirect was added to allow AIX 1632 32-bit/64-bit and GNU/Linux 64-bit PowerPC users control whether we 1633 save the TOC in the prologue for indirect calls or generate the 1634 save inline. This can speed up some programs that call through a 1635 function pointer a lot, but it can slow down other functions that 1636 only call through a function pointer in exceptional cases. 1637 * The PowerPC port will now enable machine-specific built-in 1638 functions when the user switches the target machine using the 1639 #pragma GCC target or __attribute__ ((__target__ ("target"))) code 1640 sequences. In addition, the target macros are updated. However, due 1641 to the way the -save-temps switch is implemented, you won't see the 1642 effect of these additional macros being defined in preprocessor 1643 output. 1644 1645 SH 1646 1647 * A new option -msoft-atomic has been added. When it is specified, 1648 GCC will generate GNU/Linux-compatible gUSA atomic sequences for 1649 the new __atomic routines. 1650 * Since it is neither supported by GAS nor officially documented, 1651 code generation for little endian SH2A has been disabled. 1652 Specifying -ml with -m2a* will now result in a compiler error. 1653 * The defunct -mbranch-cost option has been fixed. 1654 * Some improvements to the generated code of: 1655 + Utilization of the tst #imm,R0 instruction. 1656 + Dynamic shift instructions on SH2A. 1657 + Integer absolute value calculations. 1658 * The -mdiv= option for targets other than SHmedia has been fixed and 1659 documented. 1660 1661 SPARC 1662 1663 * The option -mflat has been reinstated. When it is specified, the 1664 compiler will generate code for a single register window model. 1665 This is essentially a new implementation and the corresponding 1666 debugger support has been added to GDB 7.4. 1667 * Support for the options -mtune=native and -mcpu=native has been 1668 added on selected native platforms (GNU/Linux and Solaris). 1669 * Support for the SPARC T3 (Niagara 3) processor has been added. 1670 * VIS: 1671 + An intrinsics header visintrin.h has been added. 1672 + Builtin intrinsics for the VIS 1.0 edge handling and pixel 1673 compare instructions have been added. 1674 + The little-endian version of alignaddr is now supported. 1675 + When possible, VIS builtins are marked const, which should 1676 increase the compiler's ability to optimize VIS operations. 1677 + The compiler now properly tracks the %gsr register and how it 1678 behaves as an input for various VIS instructions. 1679 + Akin to fzero, the compiler can now generate fone instructions 1680 in order to set all of the bits of a floating-point register 1681 to 1. 1682 + The documentation for the VIS intrinsics in the GCC manual has 1683 been brought up to date and many inaccuracies were fixed. 1684 + Intrinsics for the VIS 2.0 bmask, bshuffle, and 1685 non-condition-code setting edge instructions have been added. 1686 Their availability is controlled by the new -mvis2 and 1687 -mno-vis2 options. They are enabled by default on 1688 UltraSPARC-III and later CPUs. 1689 * Support for UltraSPARC Fused Multiply-Add floating-point extensions 1690 has been added. These instructions are enabled by default on SPARC 1691 T3 (Niagara 3) and later CPUs. 1692 1693 TILE-Gx/TILEPro 1694 1695 * Support has been added for the Tilera TILE-Gx and TILEPro families 1696 of processors. 1697 1698 Other significant improvements 1699 1700 * A new option (-grecord-gcc-switches) was added that appends 1701 compiler command-line options that might affect code generation to 1702 the DW_AT_producer attribute string in the DWARF debugging 1703 information. 1704 * GCC now supports various new GNU extensions to the DWARF debugging 1705 information format, like [41]entry value and [42]call site 1706 information, [43]typed DWARF stack or [44]a more compact macro 1707 representation. Support for these extensions has been added to GDB 1708 7.4. They can be disabled through the -gstrict-dwarf command-line 1709 option. 1710 1711 GCC 4.7.1 1712 1713 This is the [45]list of problem reports (PRs) from GCC's bug tracking 1714 system that are known to be fixed in the 4.7.1 release. This list might 1715 not be complete (that is, it is possible that some PRs that have been 1716 fixed are not listed here). 1717 1718 The Go frontend in the 4.7.1 release fully supports the [46]Go 1 1719 language standard. 1720 1721 GCC 4.7.2 1722 1723 This is the [47]list of problem reports (PRs) from GCC's bug tracking 1724 system that are known to be fixed in the 4.7.2 release. This list might 1725 not be complete (that is, it is possible that some PRs that have been 1726 fixed are not listed here). 1727 1728 GCC 4.7.3 1729 1730 This is the [48]list of problem reports (PRs) from GCC's bug tracking 1731 system that are known to be fixed in the 4.7.3 release. This list might 1732 not be complete (that is, it is possible that some PRs that have been 1733 fixed are not listed here). 1734 1735 GCC 4.7.4 1736 1737 This is the [49]list of problem reports (PRs) from GCC's bug tracking 1738 system that are known to be fixed in the 4.7.4 release. This list might 1739 not be complete (that is, it is possible that some PRs that have been 1740 fixed are not listed here). 1741 1742 1743 For questions related to the use of GCC, please consult these web 1744 pages and the [50]GCC manuals. If that fails, the 1745 [51]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 1746 web pages and the development of GCC are welcome on our developer 1747 list at [52]gcc (a] gcc.gnu.org. All of [53]our lists have public 1748 archives. 1749 1750 Copyright (C) [54]Free Software Foundation, Inc. Verbatim copying and 1751 distribution of this entire article is permitted in any medium, 1752 provided this notice is preserved. 1753 1754 These pages are [55]maintained by the GCC team. Last modified 1755 2014-12-06[56]. 1756 1757 References 1758 1759 1. https://gcc.gnu.org/ml/gcc-patches/2011-03/msg01263.html 1760 2. http://savannah.nongnu.org/bugs/?35407 1761 3. https://gcc.gnu.org/PR18145 1762 4. https://gcc.gnu.org/gcc-4.7/porting_to.html 1763 5. http://openmp.org/wp/openmp-specifications/ 1764 6. https://gcc.gnu.org/wiki/TransactionalMemory 1765 7. https://gcc.gnu.org/wiki/Atomic/GCCMM 1766 8. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1767 9. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1768 10. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1769 11. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1770 12. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1771 13. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1772 14. https://gcc.gnu.org/PR14258 1773 15. https://gcc.gnu.org/PR35688 1774 16. https://gcc.gnu.org/onlinedocs/gcc-4.7.4/libstdc++/manual/manual/status.html#status.iso.2011 1775 17. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfstack-arrays_007d-254 1776 18. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Optimize-Options.html#index-Ofast-689 1777 19. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfno-protect-parens_007d-270 1778 20. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfstack-arrays_007d-254 1779 21. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfrontend-optimize_007d-275 1780 22. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Error-and-Warning-Options.html#index-g_t_0040code_007bWfunction-elimination_007d-170 1781 23. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfaggressive-function-elimination_007d-270 1782 24. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Error-and-Warning-Options.html#index-g_t_0040code_007bWreal-q-constant_007d-149 1783 25. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/SELECTED_005fREAL_005fKIND.html 1784 26. http://msdn.microsoft.com/en-us/library/bb787181%28v=vs.85%29.aspx 1785 27. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Debugging-Options.html#index-g_t_0040code_007bfno-backtrace_007d-183 1786 28. https://gcc.gnu.org/wiki/Fortran2003Status 1787 29. https://gcc.gnu.org/wiki/OOP 1788 30. https://gcc.gnu.org/wiki/Fortran2008Status 1789 31. https://gcc.gnu.org/wiki/Coarray 1790 32. https://gcc.gnu.org/wiki/CoarrayLib 1791 33. https://gcc.gnu.org/wiki/TS29113Status 1792 34. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Fortran-Dialect-Options.html#index-g_t_0040code_007bstd_003d_007d_0040var_007bstd_007d-option-53 1793 35. http://weekly.golang.org/doc/go1.html 1794 36. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Named-Address-Spaces.html 1795 37. http://nongnu.org/avr-libc/ 1796 38. https://gcc.gnu.org/PR54461 1797 39. https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/AVR-Built%5f002din-Functions.html 1798 40. https://sites.google.com/site/x32abi/ 1799 41. http://www.dwarfstd.org/ShowIssue.php?issue=100909.1 1800 42. http://www.dwarfstd.org/ShowIssue.php?issue=100909.2 1801 43. http://www.dwarfstd.org/doc/040408.1.html 1802 44. http://www.dwarfstd.org/ShowIssue.php?issue=110722.1 1803 45. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.1 1804 46. http://weekly.golang.org/doc/go1.html 1805 47. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.2 1806 48. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.3 1807 49. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.4 1808 50. https://gcc.gnu.org/onlinedocs/ 1809 51. mailto:gcc-help (a] gcc.gnu.org 1810 52. mailto:gcc (a] gcc.gnu.org 1811 53. https://gcc.gnu.org/lists.html 1812 54. http://www.fsf.org/ 1813 55. https://gcc.gnu.org/about.html 1814 56. http://validator.w3.org/check/referer 1815 ====================================================================== 1816 http://gcc.gnu.org/gcc-4.6/index.html 1817 1818 GCC 4.6 Release Series 1819 1820 April 12, 2013 1821 1822 The [1]GNU project and the GCC developers are pleased to announce the 1823 release of GCC 4.6.4. 1824 1825 This release is a bug-fix release, containing fixes for regressions in 1826 GCC 4.6.3 relative to previous releases of GCC. 1827 1828 Release History 1829 1830 GCC 4.6.4 1831 April 12, 2013 ([2]changes, [3]documentation) 1832 1833 GCC 4.6.3 1834 March 1, 2012 ([4]changes, [5]documentation) 1835 1836 GCC 4.6.2 1837 October 26, 2011 ([6]changes, [7]documentation) 1838 1839 GCC 4.6.1 1840 June 27, 2011 ([8]changes, [9]documentation) 1841 1842 GCC 4.6.0 1843 March 25, 2011 ([10]changes, [11]documentation) 1844 1845 References and Acknowledgements 1846 1847 GCC used to stand for the GNU C Compiler, but since the compiler 1848 supports several other languages aside from C, it now stands for the 1849 GNU Compiler Collection. 1850 1851 A list of [12]successful builds is updated as new information becomes 1852 available. 1853 1854 The GCC developers would like to thank the numerous people that have 1855 contributed new features, improvements, bug fixes, and other changes as 1856 well as test results to GCC. This [13]amazing group of volunteers is 1857 what makes GCC successful. 1858 1859 For additional information about GCC please refer to the [14]GCC 1860 project web site or contact the [15]GCC development mailing list. 1861 1862 To obtain GCC please use [16]our mirror sites or [17]our SVN server. 1863 1864 1865 For questions related to the use of GCC, please consult these web 1866 pages and the [18]GCC manuals. If that fails, the 1867 [19]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 1868 web pages and the development of GCC are welcome on our developer 1869 list at [20]gcc (a] gcc.gnu.org. All of [21]our lists have public 1870 archives. 1871 1872 Copyright (C) [22]Free Software Foundation, Inc. Verbatim copying and 1873 distribution of this entire article is permitted in any medium, 1874 provided this notice is preserved. 1875 1876 These pages are [23]maintained by the GCC team. Last modified 1877 2014-06-28[24]. 1878 1879 References 1880 1881 1. http://www.gnu.org/ 1882 2. http://gcc.gnu.org/gcc-4.6/changes.html 1883 3. https://gcc.gnu.org/onlinedocs/4.6.4/ 1884 4. http://gcc.gnu.org/gcc-4.6/changes.html 1885 5. https://gcc.gnu.org/onlinedocs/4.6.3/ 1886 6. http://gcc.gnu.org/gcc-4.6/changes.html 1887 7. https://gcc.gnu.org/onlinedocs/4.6.2/ 1888 8. http://gcc.gnu.org/gcc-4.6/changes.html 1889 9. https://gcc.gnu.org/onlinedocs/4.6.1/ 1890 10. http://gcc.gnu.org/gcc-4.6/changes.html 1891 11. https://gcc.gnu.org/onlinedocs/4.6.0/ 1892 12. http://gcc.gnu.org/gcc-4.6/buildstat.html 1893 13. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 1894 14. http://gcc.gnu.org/index.html 1895 15. mailto:gcc (a] gcc.gnu.org 1896 16. http://gcc.gnu.org/mirrors.html 1897 17. http://gcc.gnu.org/svn.html 1898 18. https://gcc.gnu.org/onlinedocs/ 1899 19. mailto:gcc-help (a] gcc.gnu.org 1900 20. mailto:gcc (a] gcc.gnu.org 1901 21. https://gcc.gnu.org/lists.html 1902 22. http://www.fsf.org/ 1903 23. https://gcc.gnu.org/about.html 1904 24. http://validator.w3.org/check/referer 1905 ====================================================================== 1906 http://gcc.gnu.org/gcc-4.6/changes.html 1907 1908 GCC 4.6 Release Series 1909 Changes, New Features, and Fixes 1910 1911 Caveats 1912 1913 * The options -b <machine> and -V <version> have been removed because 1914 they were unreliable. Instead, users should directly run 1915 <machine>-gcc when cross-compiling, or <machine>-gcc-<version> to 1916 run a different version of gcc. 1917 * GCC now has stricter checks for invalid command-line options. In 1918 particular, when gcc was called to link object files rather than 1919 compile source code, it would previously accept and ignore all 1920 options starting with --, including linker options such as 1921 --as-needed and --export-dynamic, although such options would 1922 result in errors if any source code was compiled. Such options, if 1923 unknown to the compiler, are now rejected in all cases; if the 1924 intent was to pass them to the linker, options such as 1925 -Wl,--as-needed should be used. 1926 * Versions of the GNU C library up to and including 2.11.1 included 1927 an [1]incorrect implementation of the cproj function. GCC optimizes 1928 its builtin cproj according to the behavior specified and allowed 1929 by the ISO C99 standard. If you want to avoid discrepancies between 1930 the C library and GCC's builtin transformations when using cproj in 1931 your code, use GLIBC 2.12 or later. If you are using an older GLIBC 1932 and actually rely on the incorrect behavior of cproj, then you can 1933 disable GCC's transformations using -fno-builtin-cproj. 1934 * The C-only intermodule optimization framework (IMA, enabled by 1935 -combine) has been removed in favor of the new generic link-time 1936 optimization framework (LTO) introduced in [2]GCC 4.5.0. 1937 * GCC now ships with the LGPL-licensed libquadmath library, which 1938 provides quad-precision mathematical functions for targets with a 1939 __float128 datatype. __float128 is available for targets on 32-bit 1940 x86, x86-64 and Itanium architectures. The libquadmath library is 1941 automatically built on such targets when building the Fortran 1942 compiler. 1943 * New -Wunused-but-set-variable and -Wunused-but-set-parameter 1944 warnings were added for C, C++, Objective-C and Objective-C++. 1945 These warnings diagnose variables respective parameters which are 1946 only set in the code and never otherwise used. Usually such 1947 variables are useless and often even the value assigned to them is 1948 computed needlessly, sometimes expensively. The 1949 -Wunused-but-set-variable warning is enabled by default by -Wall 1950 flag and -Wunused-but-set-parameter by -Wall -Wextra flags. 1951 * On ARM, a bug has been fixed in GCC's implementation of the AAPCS 1952 rules for the layout of vectors that could lead to wrong code being 1953 generated. Vectors larger than 8 bytes in size are now by default 1954 aligned to an 8-byte boundary. This is an ABI change: code that 1955 makes explicit use of vector types may be incompatible with binary 1956 objects built with older versions of GCC. Auto-vectorized code is 1957 not affected by this change. (This change affects GCC versions 1958 4.6.4 and later, with the exception of versions 4.7.0 and 4.7.1.) 1959 * On AVR, variables with the progmem attribute to locate data in 1960 flash memory must be qualified as const. 1961 * Support for a number of older systems and recently unmaintained or 1962 untested target ports of GCC has been declared obsolete in GCC 4.6. 1963 Unless there is activity to revive them, the next release of GCC 1964 will have their sources permanently removed. 1965 All GCC ports for the following processor architectures have been 1966 declared obsolete: 1967 + Argonaut ARC (arc-*) 1968 + National Semiconductor CRX (crx-*) 1969 + Motorola 68HC11 and 68HC12 (m68hc11-*-*, m6811-*-*, 1970 m68hc12-*-*, m6812-*-*) 1971 + Sunplus S+core (score-*) 1972 The following ports for individual systems on particular 1973 architectures have been obsoleted: 1974 + Interix (i[34567]86-*-interix3*) 1975 + NetWare x86 (i[3456x]86-*-netware*) 1976 + Generic ARM PE (arm-*-pe* other than arm*-wince-pe*) 1977 + MCore PE (mcore-*-pe*) 1978 + SH SymbianOS (sh*-*-symbianelf*) 1979 + GNU Hurd on Alpha and PowerPC (alpha*-*-gnu*, powerpc*-*-gnu*) 1980 + M68K uClinux old ABI (m68k-*-uclinuxoldabi*) 1981 + a.out NetBSD (arm*-*-netbsd*, i[34567]86-*-netbsd*, 1982 vax-*-netbsd*, but not *-*-netbsdelf*) 1983 The i[34567]86-*-pe alias for Cygwin targets has also been 1984 obsoleted; users should configure for i[34567]86-*-cygwin* instead. 1985 Certain configure options to control the set of libraries built 1986 with GCC on some targets have been obsoleted. On ARM targets, the 1987 options --disable-fpu, --disable-26bit, --disable-underscore, 1988 --disable-interwork, --disable-biendian and --disable-nofmult have 1989 been obsoleted. On MIPS targets, the options 1990 --disable-single-float, --disable-biendian and --disable-softfloat 1991 have been obsoleted. 1992 * Support has been removed for all the [3]configurations obsoleted in 1993 GCC 4.5. 1994 * More information on porting to GCC 4.6 from previous versions of 1995 GCC can be found in the [4]porting guide for this release. 1996 1997 General Optimizer Improvements 1998 1999 * A new general optimization level, -Ofast, has been introduced. It 2000 combines the existing optimization level -O3 with options that can 2001 affect standards compliance but result in better optimized code. 2002 For example, -Ofast enables -ffast-math. 2003 * Link-time optimization improvements: 2004 + The [5]Scalable Whole Program Optimizer (WHOPR) project has 2005 stabilized to the point of being usable. It has become the 2006 default mode when using the LTO optimization model. Link time 2007 optimization can now split itself into multiple parallel 2008 compilations. Parallelism is controlled with -flto=n (where n 2009 specifies the number of compilations to execute in parallel). 2010 GCC can also cooperate with a GNU make job server by 2011 specifying the -flto=jobserver option and adding + to the 2012 beginning of the Makefile rule executing the linker. 2013 Classical LTO mode can be enforced by -flto-partition=none. 2014 This may result in small code quality improvements. 2015 + A large number of bugs were fixed. GCC itself, Mozilla Firefox 2016 and other large applications can be built with LTO enabled. 2017 + The linker plugin support improvements 2018 o Linker plugin is now enabled by default when the linker 2019 is detected to have plugin support. This is the case for 2020 GNU ld 2.21.51 or newer (on ELF and Cygwin targets) and 2021 the Gold linker on ELF targets. Plugin support of the 2022 Apple linker on Darwin is not compatible with GCC. The 2023 linker plugin can also be controlled by the 2024 -fuse-linker-plugin command line option. 2025 o Resolution information from the linker plugin is used to 2026 drive whole program assumptions. Use of the linker plugin 2027 results in more aggressive optimization on binaries and 2028 on shared libraries that use the hidden visibility 2029 attribute. Consequently the use of -fwhole-program is not 2030 necessary in addition to LTO. 2031 + Hidden symbols used from non-LTO objects now have to be 2032 explicitly annotated with externally_visible when the linker 2033 plugin is not used. 2034 + C++ inline functions and virtual tables are now privatized 2035 more aggressively, leading to better inter-procedural 2036 optimization and faster dynamic linking. 2037 + Memory usage and intermediate language streaming performance 2038 have been improved. 2039 + Static constructors and destructors from individual units are 2040 inlined into a single function. This can significantly improve 2041 startup times of large C++ applications where static 2042 constructors are very common. For example, static constructors 2043 are used when including the iostream header. 2044 + Support for the Ada language has been added. 2045 * Interprocedural optimization improvements 2046 + The interprocedural framework was re-tuned for link time 2047 optimization. Several scalability issues were resolved. 2048 + Improved auto-detection of const and pure functions. Newly, 2049 noreturn functions are auto-detected. 2050 The [6]-Wsuggest-attribute=[const|pure|noreturn] flag is 2051 available that informs users when adding attributes to headers 2052 might improve code generation. 2053 + A number of inlining heuristic improvements. In particular: 2054 o Partial inlining is now supported and enabled by default 2055 at -O2 and greater. The feature can be controlled via 2056 -fpartial-inlining. 2057 Partial inlining splits functions with short hot path to 2058 return. This allows more aggressive inlining of the hot 2059 path leading to better performance and often to code size 2060 reductions (because cold parts of functions are not 2061 duplicated). 2062 o Scalability for large compilation units was improved 2063 significantly. 2064 o Inlining of callbacks is now more aggressive. 2065 o Virtual methods are considered for inlining when the 2066 caller is inlined and devirtualization is then possible. 2067 o Inlining when optimizing for size (either in cold regions 2068 of a program or when compiling with -Os) was improved to 2069 better handle C++ programs with larger abstraction 2070 penalty, leading to smaller and faster code. 2071 + The IPA reference optimization pass detecting global variables 2072 used or modified by functions was strengthened and sped up. 2073 + Functions whose address was taken are now optimized out when 2074 all references to them are dead. 2075 + A new inter-procedural static profile estimation pass detects 2076 functions that are executed once or unlikely to be executed. 2077 Unlikely executed functions are optimized for size. Functions 2078 executed once are optimized for size except for the inner 2079 loops. 2080 + On most targets with named section support, functions used 2081 only at startup (static constructors and main), functions used 2082 only at exit and functions detected to be cold are placed into 2083 separate text segment subsections. This extends the 2084 -freorder-functions feature and is controlled by the same 2085 switch. The goal is to improve the startup time of large C++ 2086 programs. 2087 Proper function placement requires linker support. GNU ld 2088 2.21.51 on ELF targets was updated to place those functions 2089 together within the text section leading to better code 2090 locality and faster startup times of large C++ programs. The 2091 feature is also supported in the Apple linker. Support in the 2092 gold linker is planned. 2093 * A new switch -fstack-usage has been added. It makes the compiler 2094 output stack usage information for the program, on a per-function 2095 basis, in an auxiliary file. 2096 * A new switch -fcombine-stack-adjustments has been added. It can be 2097 used to enable or disable the compiler's stack-slot combining pass 2098 which before was enabled automatically at -O1 and above, but could 2099 not be controlled on its own. 2100 * A new switch -fstrict-volatile-bitfields has been added. Using it 2101 indicates that accesses to volatile bitfields should use a single 2102 access of the width of the field's type. This option can be useful 2103 for precisely defining and accessing memory-mapped peripheral 2104 registers from C or C++. 2105 2106 Compile time and memory usage improvements 2107 2108 * Datastructures used by the dataflow framework in GCC were 2109 reorganized for better memory usage and more cache locality. 2110 Compile time is improved especially on units with large functions 2111 (possibly resulting from a lot of inlining) not fitting into the 2112 processor cache. The compile time of the GCC C compiler binary with 2113 link-time optimization went down by over 10% (benchmarked on x86-64 2114 target). 2115 2116 New Languages and Language specific improvements 2117 2118 Ada 2119 2120 * Stack checking has been improved on selected architectures (Alpha, 2121 IA-32/x86-64, RS/6000 and SPARC): it now will detect stack 2122 overflows in all cases on these architectures. 2123 * Initial support for Ada 2012 has been added. 2124 2125 C family 2126 2127 * A new warning, enabled by -Wdouble-promotion, has been added that 2128 warns about cases where a value of type float is implicitly 2129 promoted to double. This is especially helpful for CPUs that handle 2130 the former in hardware, but emulate the latter in software. 2131 * A new function attribute leaf was introduced. This attribute allows 2132 better inter-procedural optimization across calls to functions that 2133 return to the current unit only via returning or exception 2134 handling. This is the case for most library functions that have no 2135 callbacks. 2136 * Support for a new data type __int128 for targets having wide enough 2137 machine-mode support. 2138 * The new function attribute callee_pop_aggregate allows to specify 2139 if the caller or callee is responsible for popping the aggregate 2140 return pointer value from the stack. 2141 * Support for selectively enabling and disabling warnings via #pragma 2142 GCC diagnostic has been added. For instance: 2143 #pragma GCC diagnostic error "-Wuninitialized" 2144 foo(a); /* error is given for this one */ 2145 #pragma GCC diagnostic push 2146 #pragma GCC diagnostic ignored "-Wuninitialized" 2147 foo(b); /* no diagnostic for this one */ 2148 #pragma GCC diagnostic pop 2149 foo(c); /* error is given for this one */ 2150 #pragma GCC diagnostic pop 2151 foo(d); /* depends on command line options */ 2152 2153 * The -fmax-errors=N option is now supported. Using this option 2154 causes the compiler to exit after N errors have been issued. 2155 2156 C 2157 2158 * There is now experimental support for some features from the 2159 upcoming C1X revision of the ISO C standard. This support may be 2160 selected with -std=c1x, or -std=gnu1x for C1X with GNU extensions. 2161 Note that this support is experimental and may change incompatibly 2162 in future releases for consistency with changes to the C1X standard 2163 draft. The following features are newly supported as described in 2164 the N1539 draft of C1X (with changes agreed at the March 2011 WG14 2165 meeting); some other features were already supported with no 2166 compiler changes being needed, or have some support but not in full 2167 accord with N1539 (as amended). 2168 + Static assertions (_Static_assert keyword) 2169 + Typedef redefinition 2170 + New macros in <float.h> 2171 + Anonymous structures and unions 2172 * The new -fplan9-extensions option directs the compiler to support 2173 some extensions for anonymous struct fields which are implemented 2174 by the Plan 9 compiler. A pointer to a struct may be automatically 2175 converted to a pointer to an anonymous field when calling a 2176 function, in order to make the types match. An anonymous struct 2177 field whose type is a typedef name may be referred to using the 2178 typedef name. 2179 2180 C++ 2181 2182 * Improved [7]experimental support for the upcoming C++0x ISO C++ 2183 standard, including support for constexpr (thanks to Gabriel Dos 2184 Reis and Jason Merrill), nullptr (thanks to Magnus Fromreide), 2185 noexcept, unrestricted unions, range-based for loops (thanks to 2186 Rodrigo Rivas Costa), opaque enum declarations (thanks also to 2187 Rodrigo), implicitly deleted functions and implicit move 2188 constructors. 2189 * When an extern declaration within a function does not match a 2190 declaration in the enclosing context, G++ now properly declares the 2191 name within the namespace of the function rather than the namespace 2192 which was open just before the function definition ([8]c++/43145). 2193 * GCC now warns by default when casting integers to larger pointer 2194 types. These warnings can be disabled with the option 2195 -Wno-int-to-pointer-cast, which is now also available in C++. 2196 * G++ no longer optimizes using the assumption that a value of 2197 enumeration type will fall within the range specified by the 2198 standard, since that assumption is easily violated with a 2199 conversion from integer type ([9]c++/43680). The old behavior can 2200 be restored with -fstrict-enums. 2201 * The new -fnothrow-opt flag changes the semantics of a throw() 2202 exception specification to match the proposed semantics of the 2203 noexcept specification: just call terminate if an exception tries 2204 to propagate out of a function with such an exception 2205 specification. This dramatically reduces or eliminates the code 2206 size overhead from adding the exception specification. 2207 * The new -Wnoexcept flag will suggest adding a noexcept qualifier to 2208 a function that the compiler can tell doesn't throw if it would 2209 change the value of a noexcept expression. 2210 * The -Wshadow option now warns if a local variable or type 2211 declaration shadows another type in C++. Note that the compiler 2212 will not warn if a local variable shadows a struct/class/enum, but 2213 will warn if it shadows an explicit typedef. 2214 * When an identifier is not found in the current scope, G++ now 2215 offers suggestions about which identifier might have been intended. 2216 * G++ now issues clearer diagnostics for missing semicolons after 2217 class, struct, and union definitions. 2218 * G++ now issues clearer diagnostics for missing semicolons after 2219 class member declarations. 2220 * G++ now issues clearer diagnostics when a colon is used in a place 2221 where a double-colon was intended. 2222 * G++ no longer accepts mutable on reference members ([10]c++/33558). 2223 Use -fpermissive to allow the old, non-conforming behaviour. 2224 * A few mangling fixes have been made, to attribute const/volatile on 2225 function pointer types, decltype of a plain decl, and use of a 2226 function parameter in the declaration of another parameter. By 2227 default the compiler still uses the old mangling, but emits aliases 2228 with the new mangling on targets that support strong aliases. Users 2229 can switch over entirely to the new mangling with -fabi-version=5 2230 or -fabi-version=0. -Wabi will now warn about code that uses the 2231 old mangling. 2232 * In 4.6.0 and 4.6.1 G++ no longer allows objects of const-qualified 2233 type to be default initialized unless the type has a user-declared 2234 default constructor. In 4.6.2 G++ implements the proposed 2235 resolution of [11]DR 253, so default initialization is allowed if 2236 it initializes all subobjects. Code that fails to compile can be 2237 fixed by providing an initializer e.g. 2238 struct A { A(); }; 2239 struct B : A { int i; }; 2240 const B b = B(); 2241 Use -fpermissive to allow the old, non-conforming behaviour. 2242 2243 Runtime Library (libstdc++) 2244 2245 * [12]Improved experimental support for the upcoming ISO C++ 2246 standard, C++0x, including using constexpr and nullptr. 2247 * Performance improvements to the [13]Debug Mode, thanks to Franc,ois 2248 Dumont. 2249 * Atomic operations used for reference-counting are annotated so that 2250 they can be understood by race detectors such as Helgrind, see 2251 [14]Data Race Hunting. 2252 * Most libstdc++ standard headers have been changed to no longer 2253 include the cstddef header as an implementation detail. Code that 2254 relied on that header being included as side-effect of including 2255 other standard headers will need to include cstddef explicitly. 2256 2257 Fortran 2258 2259 * On systems supporting the libquadmath library, GNU Fortran now also 2260 supports a quad-precision, kind=16 floating-point data type 2261 (REAL(16), COMPLEX(16)). As the data type is not fully supported in 2262 hardware, calculations might be one to two orders of magnitude 2263 slower than with the 4, 8 or 10 bytes floating-point data types. 2264 This change does not affect systems which support REAL(16) in 2265 hardware nor those which do not support libquadmath. 2266 * Much improved compile time for large array constructors. 2267 * In order to reduce execution time and memory consumption, use of 2268 temporary arrays in assignment expressions is avoided for many 2269 cases. The compiler now reverses loops in order to avoid generating 2270 a temporary array where possible. 2271 * Improved diagnostics, especially with -fwhole-file. 2272 * The -fwhole-file flag is now enabled by default. This improves code 2273 generation and diagnostics. It can be disabled using the deprecated 2274 -fno-whole-file flag. 2275 * Support the generation of Makefile dependencies via the [15]-M... 2276 flags of GCC; you may need to specify the -cpp option in addition. 2277 The dependencies take modules, Fortran's include, and CPP's 2278 #include into account. Note: Using -M for the module path is no 2279 longer supported, use -J instead. 2280 * The flag -Wconversion has been modified to only issue warnings 2281 where a conversion leads to information loss. This drastically 2282 reduces the number of warnings; -Wconversion is thus now enabled 2283 with -Wall. The flag -Wconversion-extra has been added and also 2284 warns about other conversions; -Wconversion-extra typically issues 2285 a huge number of warnings, most of which can be ignored. 2286 * A new command-line option -Wunused-dummy-argument warns about 2287 unused dummy arguments and is included in -Wall. Before, 2288 -Wunused-variable also warned about unused dummy arguments. 2289 * Fortran 2003 support has been extended: 2290 + Improved support for polymorphism between libraries and 2291 programs and for complicated inheritance patterns (cf. 2292 [16]object-oriented programming). 2293 + Experimental support of the ASSOCIATE construct. 2294 + In pointer assignments it is now possible to specify the lower 2295 bounds of the pointer and, for a rank-1 or a simply contiguous 2296 data-target, to remap the bounds. 2297 + Automatic (re)allocation: In intrinsic assignments to 2298 allocatable variables the left-hand side will be automatically 2299 allocated (if unallocated) or reallocated (if the shape or 2300 type parameter is different). To avoid the small performance 2301 penalty, you can use a(:) = ... instead of a = ... for arrays 2302 and character strings - or disable the feature using -std=f95 2303 or -fno-realloc-lhs. 2304 + Deferred type parameter: For scalar allocatable and pointer 2305 variables the character length can be deferred. 2306 + Namelist variables with allocatable and pointer attribute and 2307 nonconstant length type parameter are supported. 2308 * Fortran 2008 support has been extended: 2309 + Experimental [17]coarray support (for one image only, i.e. 2310 num_images() == 1); use the [18]-fcoarray=single flag to 2311 enable it. 2312 + The STOP and the new ERROR STOP statements now support all 2313 constant expressions. 2314 + Support for the CONTIGUOUS attribute. 2315 + Support for ALLOCATE with MOLD. 2316 + Support for the STORAGE_SIZE intrinsic inquiry function. 2317 + Support of the NORM2 and PARITY intrinsic functions. 2318 + The following bit intrinsics were added: POPCNT and POPPAR for 2319 counting the number of 1 bits and returning the parity; BGE, 2320 BGT, BLE, and BLT for bitwise comparisons; DSHIFTL and DSHIFTR 2321 for combined left and right shifts, MASKL and MASKR for simple 2322 left and right justified masks, MERGE_BITS for a bitwise merge 2323 using a mask, SHIFTA, SHIFTL and SHIFTR for shift operations, 2324 and the transformational bit intrinsics IALL, IANY and 2325 IPARITY. 2326 + Support of the EXECUTE_COMMAND_LINE intrinsic subroutine. 2327 + Support for the IMPURE attribute for procedures, which allows 2328 for ELEMENTAL procedures without the restrictions of PURE. 2329 + Null pointers (including NULL()) and not allocated variables 2330 can be used as actual argument to optional non-pointer, 2331 non-allocatable dummy arguments, denoting an absent argument. 2332 + Non-pointer variables with TARGET attribute can be used as 2333 actual argument to POINTER dummies with INTENT(IN) 2334 + Pointers including procedure pointers and those in a derived 2335 type (pointer components) can now be initialized by a target 2336 instead of only by NULL. 2337 + The EXIT statement (with construct-name) can now be used to 2338 leave not only the DO but also the ASSOCIATE, BLOCK, IF, 2339 SELECT CASE and SELECT TYPE constructs. 2340 + Internal procedures can now be used as actual argument. 2341 + The named constants INTEGER_KINDS, LOGICAL_KINDS, REAL_KINDS 2342 and CHARACTER_KINDS of the intrinsic module ISO_FORTRAN_ENV 2343 have been added; these arrays contain the supported kind 2344 values for the respective types. 2345 + The module procedures C_SIZEOF of the intrinsic module 2346 ISO_C_BINDINGS and COMPILER_VERSION and COMPILER_OPTIONS of 2347 ISO_FORTRAN_ENV have been implemented. 2348 + Minor changes: obsolescence diagnostics for ENTRY was added 2349 for -std=f2008; a line may start with a semicolon; for 2350 internal and module procedures END can be used instead of END 2351 SUBROUTINE and END FUNCTION; SELECTED_REAL_KIND now also takes 2352 a RADIX argument; intrinsic types are supported for 2353 TYPE(intrinsic-type-spec); multiple type-bound procedures can 2354 be declared in a single PROCEDURE statement; implied-shape 2355 arrays are supported for named constants (PARAMETER). The 2356 transformational, three argument versions of BESSEL_JN and 2357 BESSEL_YN were added - the elemental, two-argument version had 2358 been added in GCC 4.4; note that the transformational 2359 functions use a recurrence algorithm. 2360 2361 Go 2362 2363 Support for the [19]Go programming language has been added to GCC. It 2364 is not enabled by default when you build GCC; use the 2365 --enable-languages configure option to build it. The driver program for 2366 compiling Go code is gccgo. 2367 2368 Go is currently known to work on GNU/Linux and RTEMS. Solaris support 2369 is in progress. It may or may not work on other platforms. 2370 2371 Objective-C and Objective-C++ 2372 2373 * The -fobjc-exceptions flag is now required to enable Objective-C 2374 exception and synchronization syntax (introduced by the keywords 2375 @try, @catch, @finally and @synchronized). 2376 * A number of Objective-C 2.0 features and extensions are now 2377 supported by GCC. These features are enabled by default; you can 2378 disable them by using the new -fobjc-std=objc1 command-line option. 2379 * The Objective-C 2.0 dot-syntax is now supported. It is an 2380 alternative syntax for using getters and setters; object.count is 2381 automatically converted into [object count] or [object setCount: 2382 ...] depending on context; for example if (object.count > 0) is 2383 automatically compiled into the equivalent of if ([object count] > 2384 0) while object.count = 0; is automatically compiled into the 2385 equivalent ot [object setCount: 0];. The dot-syntax can be used 2386 with instance and class objects and with any setters or getters, no 2387 matter if they are part of a declared property or not. 2388 * Objective-C 2.0 declared properties are now supported. They are 2389 declared using the new @property keyword, and are most commonly 2390 used in conjunction with the new Objective-C 2.0 dot-syntax. The 2391 nonatomic, readonly, readwrite, assign, retain, copy, setter and 2392 getter attributes are all supported. Marking declared properties 2393 with __attribute__ ((deprecated)) is supported too. 2394 * The Objective-C 2.0 @synthesize and @dynamic keywords are 2395 supported. @synthesize causes the compiler to automatically 2396 synthesize a declared property, while @dynamic is used to disable 2397 all warnings for a declared property for which no implementation is 2398 provided at compile time. Synthesizing declared properties requires 2399 runtime support in most useful cases; to be able to use it with the 2400 GNU runtime, appropriate helper functions have been added to the 2401 GNU Objective-C runtime ABI, and are implemented by the GNU 2402 Objective-C runtime library shipped with GCC. 2403 * The Objective-C 2.0 fast enumeration syntax is supported in 2404 Objective-C. This is currently not yet available in Objective-C++. 2405 Fast enumeration requires support in the runtime, and such support 2406 has been added to the GNU Objective-C runtime library (shipped with 2407 GCC). 2408 * The Objective-C 2.0 @optional keyword is supported. It allows you 2409 to mark methods or properties in a protocol as optional as opposed 2410 to required. 2411 * The Objective-C 2.0 @package keyword is supported. It has currently 2412 the same effect as the @public keyword. 2413 * Objective-C 2.0 method attributes are supported. Currently the 2414 supported attributes are deprecated, sentinel, noreturn and format. 2415 * Objective-C 2.0 method argument attributes are supported. The most 2416 widely used attribute is unused, to mark an argument as unused in 2417 the implementation. 2418 * Objective-C 2.0 class and protocol attributes are supported. 2419 Currently the only supported attribute is deprecated. 2420 * Objective-C 2.0 class extensions are supported. A class extension 2421 has the same syntax as a category declaration with no category 2422 name, and the methods and properties declared in it are added 2423 directly to the main class. It is mostly used as an alternative to 2424 a category to add methods to a class without advertising them in 2425 the public headers, with the advantage that for class extensions 2426 the compiler checks that all the privately declared methods are 2427 actually implemented. 2428 * As a result of these enhancements, GCC can now be used to build 2429 Objective-C and Objective-C++ software that uses Foundation and 2430 other important system frameworks with the NeXT runtime on Darwin 9 2431 and Darwin 10 (OSX 10.5 and 10.6). 2432 * Many bugs in the compiler have been fixed in this release; in 2433 particular, LTO can now be used when compiling Objective-C and 2434 Objective-C++ and the parser is much more robust in dealing with 2435 invalid code. 2436 2437 Runtime Library (libobjc) 2438 2439 * The GNU Objective-C runtime library now defines the macro 2440 __GNU_LIBOBJC__ (with a value that is increased at every release 2441 where there is any change to the API) in objc/objc.h, making it 2442 easy to determine if the GNU Objective-C runtime library is being 2443 used, and if so, which version. Previous versions of the GNU 2444 Objective-C runtime library (and other Objective-C runtime 2445 libraries such as the Apple one) do not define this macro. 2446 * A new Objective-C 2.0 API, almost identical to the one implemented 2447 by the Apple Objective-C runtime, has been implemented in the GNU 2448 Objective-C runtime library. The new API hides the internals of 2449 most runtime structures but provides a more extensive set of 2450 functions to operate on them. It is much easier, for example, to 2451 create or modify classes at runtime. The new API also makes it 2452 easier to port software from Apple to GNU as almost no changes 2453 should be required. The old API is still supported for backwards 2454 compatibility; including the old objc/objc-api.h header file 2455 automatically selects the old API, while including the new 2456 objc/runtime.h header file automatically selects the new API. 2457 Support for the old API is being phased out and upgrading the 2458 software to use the new API is strongly recommended. To check for 2459 the availability of the new API, the __GNU_LIBOBJC__ macro can be 2460 used as older versions of the GNU Objective-C runtime library, 2461 which do not support the new API, do not define such a macro. 2462 * Runtime support for @synchronized has been added. 2463 * Runtime support for Objective-C 2.0 synthesized property accessors 2464 has been added. 2465 * Runtime support for Objective-C 2.0 fast enumeration has been 2466 added. 2467 2468 New Targets and Target Specific Improvements 2469 2470 ARM 2471 2472 * GCC now supports the Cortex-M4 processor implementing the v7-em 2473 version of the architecture using the option -mcpu=cortex-m4. 2474 * Scheduling descriptions for the Cortex-M4, the Neon and the 2475 floating point units of the Cortex-A9 and a pipeline description 2476 for the Cortex-A5 have been added. 2477 * Synchronization primitives such as __sync_fetch_and_add and friends 2478 are now inlined for supported architectures rather than calling 2479 into a kernel helper function. 2480 * SSA loop prefetching is enabled by default for the Cortex-A9 at 2481 -O3. 2482 * Several improvements were committed to improve code generation for 2483 the ARM architecture including a rewritten implementation for load 2484 and store multiples. 2485 * Several enhancements were committed to improve SIMD code generation 2486 for NEON by adding support for widening instructions, misaligned 2487 loads and stores, vector conditionals and support for 64 bit 2488 arithmetic. 2489 * Support was added for the Faraday cores fa526, fa606te, fa626te, 2490 fmp626te, fmp626 and fa726te and can be used with the respective 2491 names as parameters to the -mcpu= option. 2492 * Basic support was added for Cortex-A15 and is available through 2493 -mcpu=cortex-a15. 2494 * GCC for AAPCS configurations now more closely adheres to the AAPCS 2495 specification by enabling -fstrict-volatile-bitfields by default. 2496 2497 IA-32/x86-64 2498 2499 * The new -fsplit-stack option permits programs to use a 2500 discontiguous stack. This is useful for threaded programs, in that 2501 it is no longer necessary to specify the maximum stack size when 2502 creating a thread. This feature is currently only implemented for 2503 32-bit and 64-bit x86 GNU/Linux targets. 2504 * Support for emitting profiler counter calls before function 2505 prologues. This is enabled via a new command-line option -mfentry. 2506 * Optimization for the Intel Core 2 processors is now available 2507 through the -march=core2 and -mtune=core2 options. 2508 * Support for Intel Core i3/i5/i7 processors is now available through 2509 the -march=corei7 and -mtune=corei7 options. 2510 * Support for Intel Core i3/i5/i7 processors with AVX is now 2511 available through the -march=corei7-avx and -mtune=corei7-avx 2512 options. 2513 * Support for AMD Bobcat (family 14) processors is now available 2514 through the -march=btver1 and -mtune=btver1 options. 2515 * Support for AMD Bulldozer (family 15) processors is now available 2516 through the -march=bdver1 and -mtune=bdver1 options. 2517 * The default setting (when not optimizing for size) for 32-bit 2518 GNU/Linux and Darwin x86 targets has been changed to 2519 -fomit-frame-pointer. The default can be reverted to 2520 -fno-omit-frame-pointer by configuring GCC with the 2521 --enable-frame-pointer configure option. 2522 * Darwin, FreeBSD, Solaris 2, MinGW and Cygwin now all support 2523 __float128 on 32-bit and 64-bit x86 targets. 2524 * AVX floating-point arithmetic can now be enabled by default at 2525 configure time with the new --with-fpmath=avx option. 2526 * The SSA loop prefetching pass is enabled when using -O3 when 2527 optimizing for CPUs where prefetching is beneficial (AMD CPUs newer 2528 than K6). 2529 * Support for TBM (Trailing Bit Manipulation) built-in functions and 2530 code generation is available via -mtbm. 2531 * Support for AMD's BMI (Bit Manipulation) built-in functions and 2532 code generation is available via -mbmi. 2533 2534 MicroBlaze 2535 2536 * Support has been added for the Xilinx MicroBlaze softcore processor 2537 (microblaze-elf) embedded target. This configurable processor is 2538 supported on several Xilinx Spartan and Virtex FPGAs. 2539 2540 MIPS 2541 2542 * GCC now supports the Loongson 3A processor. Its canonical -march= 2543 and -mtune= name is loongson3a. 2544 2545 MN10300 / AM33 2546 2547 * The inline assembly register constraint "A" has been renamed "c". 2548 This constraint is used to select a floating-point register that 2549 can be used as the destination of a multiply-accumulate 2550 instruction. 2551 * New inline assembly register constraints "A" and "D" have been 2552 added. These constraint letters resolve to all general registers 2553 when compiling for AM33, and resolve to address registers only or 2554 data registers only when compiling for MN10300. 2555 * The MDR register is represented in the compiler. One can access the 2556 register via the "z" constraint in inline assembly. It can be 2557 marked as clobbered or used as a local register variable via the 2558 "mdr" name. The compiler uses the RETF instruction if the function 2559 does not modify the MDR register, so it is important that inline 2560 assembly properly annotate any usage of the register. 2561 2562 PowerPC/PowerPC64 2563 2564 * GCC now supports the Applied Micro Titan processor with 2565 -mcpu=titan. 2566 * The -mrecip option has been added, which indicates whether the 2567 reciprocal and reciprocal square root instructions should be used. 2568 * The -mveclibabi=mass option can be used to enable the compiler to 2569 autovectorize mathematical functions using the Mathematical 2570 Acceleration Subsystem library. 2571 * The -msingle-pic-base option has been added, which instructs the 2572 compiler to avoid loading the PIC base register in function 2573 prologues. The PIC base register must be initialized by the runtime 2574 system. 2575 * The -mblock-move-inline-limit option has been added, which enables 2576 the user to control the maximum size of inlined memcpy calls and 2577 similar. 2578 * PowerPC64 GNU/Linux support for applications requiring a large TOC 2579 section has been improved. A new command-line option, 2580 -mcmodel=MODEL, controls this feature; valid values for MODEL are 2581 small, medium, or large. 2582 * The Altivec builtin functions vec_ld and vec_st have been modified 2583 to generate the Altivec memory instructions LVX and STVX, even if 2584 the -mvsx option is used. In the initial GCC 4.5 release, these 2585 builtin functions were changed to generate VSX memory reference 2586 instructions instead of Altivec memory instructions, but there are 2587 differences between the two instructions. If the VSX instruction 2588 set is available, you can now use the new builtin functions 2589 vec_vsx_ld and vec_vsx_st which always generates the VSX memory 2590 instructions. 2591 * The GCC compiler on AIX now defaults to a process layout with a 2592 larger data space allowing larger programs to be compiled. 2593 * The GCC long double type on AIX 6.1 and above has reverted to 64 2594 bit double precision, matching the AIX XL compiler default, because 2595 of missing C99 symbols required by the GCC runtime. 2596 * The default processor scheduling model and tuning for PowerPC64 2597 GNU/Linux and for AIX 6.1 and above now is POWER7. 2598 * Starting with GCC 4.6.1, vectors of type vector long long or vector 2599 long are passed and returned in the same method as other vectors 2600 with the VSX instruction set. Previously the GCC compiler did not 2601 adhere to the ABI for 128-bit vectors with 64-bit integer base 2602 types (PR 48857). This is also fixed in the GCC 4.5.4 release. 2603 2604 S/390, zSeries and System z9/z10, IBM zEnterprise z196 2605 2606 * Support for the zEnterprise z196 processor has been added. When 2607 using the -march=z196 option, the compiler will generate code 2608 making use of the following instruction facilities: 2609 + Conditional load/store 2610 + Distinct-operands 2611 + Floating-point-extension 2612 + Interlocked-access 2613 + Population-count 2614 The -mtune=z196 option avoids the compare and branch instructions 2615 as well as the load address instruction with an index register as 2616 much as possible and performs instruction scheduling appropriate 2617 for the new out-of-order pipeline architecture. 2618 * When using the -m31 -mzarch options the generated code still 2619 conforms to the 32-bit ABI but uses the general purpose registers 2620 as 64-bit registers internally. This requires a Linux kernel saving 2621 the whole 64-bit registers when doing a context switch. Kernels 2622 providing that feature indicate that by the 'highgprs' string in 2623 /proc/cpuinfo. 2624 * The SSA loop prefetching pass is enabled when using -O3. 2625 2626 SPARC 2627 2628 * GCC now supports the LEON series of SPARC V8 processors. The code 2629 generated by the compiler can either be tuned to it by means of the 2630 --with-tune=leon configure option and -mtune=leon compilation 2631 option, or the compiler can be built for the sparc-leon-{elf,linux} 2632 and sparc-leon3-{elf,linux} targets directly. 2633 * GCC has stopped sign/zero-extending parameter registers in the 2634 callee for functions taking parameters with sub-word size in 32-bit 2635 mode, since this is redundant with the specification of the ABI. 2636 GCC has never done so in 64-bit mode since this is also redundant. 2637 * The command line option -mfix-at697f has been added to enable the 2638 documented workaround for the single erratum of the Atmel AT697F 2639 processor. 2640 2641 Operating Systems 2642 2643 Android 2644 2645 * GCC now supports the Bionic C library and provides a convenient way 2646 of building native libraries and applications for the Android 2647 platform. Refer to the documentation of the -mandroid and -mbionic 2648 options for details on building native code. At the moment, Android 2649 support is enabled only for ARM. 2650 2651 Darwin/Mac OS X 2652 2653 * General 2654 + Initial support for CFString types has been added. 2655 This allows GCC to build projects including the system Core 2656 Foundation frameworks. The GCC Objective-C family supports 2657 CFString "toll-free bridged" as per the Mac OS X system tools. 2658 CFString is also recognized in the context of format 2659 attributes and arguments (see the documentation for format 2660 attributes for limitations). At present, 8-bit character types 2661 are supported. 2662 + Object file size reduction. 2663 The Darwin zeroed memory allocators have been re-written to 2664 make more use of .zerofill sections. For non-debug code, this 2665 can reduce object file size significantly. 2666 + Objective-C family 64-bit support (NeXT ABI 2). 2667 Initial support has been added to support 64-bit Objective-C 2668 code using the Darwin/OS X native (NeXT) runtime. ABI version 2669 2 will be selected automatically when 64-bit code is built. 2670 + Objective-C family 32-bit ABI 1. 2671 For 32-bit code ABI 1 is also now also allowed. At present it 2672 must be selected manually using -fobjc-abi-version=1 where 2673 applicable - i.e. on Darwin 9/10 (OS X 10.5/10.6). 2674 * x86 Architecture 2675 + The -mdynamic-no-pic option has been enabled. 2676 Code supporting -mdynamic-no-pic optimization has been added 2677 and is applicable to -m32 builds. The compiler bootstrap uses 2678 the option where appropriate. 2679 + The default value for -mtune= has been changed. 2680 Since Darwin systems are primarily Xeon, Core-2 or similar the 2681 default tuning has been changed to -mtune=core2. 2682 + Enable 128-bit long double (__float128) support on Darwin. 2683 * PPC Architecture 2684 + Darwin64 ABI. 2685 Several significant bugs have been fixed, such that GCC now 2686 produces code compatible with the Darwin64 PowerPC ABI. 2687 + libffi and boehm-gc. 2688 The Darwin ports of the libffi and boehm-gc libraries have 2689 been upgraded to include a Darwin64 implementation. This means 2690 that powerpc*-*-darwin9 platforms may now, for example, build 2691 Java applications with -m64 enabled. 2692 + Plug-in support has been enabled. 2693 + The -fsection-anchors option is now available although, 2694 presently, not heavily tested. 2695 2696 Solaris 2 2697 2698 New Features 2699 2700 * Support symbol versioning with the Sun linker. 2701 * Allow libstdc++ to leverage full ISO C99 support on Solaris 10+. 2702 * Support thread-local storage (TLS) with the Sun assembler on 2703 Solaris 2/x86. 2704 * Support TLS on Solaris 8/9 if prerequisites are met. 2705 * Support COMDAT group with the GNU assembler and recent Sun linker. 2706 * Support the Sun assembler visibility syntax. 2707 * Default Solaris 2/x86 to -march=pentium4 (Solaris 10+) resp. 2708 -march=pentiumpro (Solaris 8/9). 2709 * Don't use SSE on Solaris 8/9 x86 by default. 2710 * Enable 128-bit long double (__float128) support on Solaris 2/x86. 2711 2712 ABI Change 2713 2714 * Change the ABI for returning 8-byte vectors like __m64 in MMX 2715 registers on Solaris 10+/x86 to match the Sun Studio 12.1+ 2716 compilers. This is an incompatible change. If you use such types, 2717 you must either recompile all your code with the new compiler or 2718 use the new -mvect8-ret-in-mem option to remain compatible with 2719 previous versions of GCC and Sun Studio. 2720 2721 Windows x86/x86_64 2722 2723 * Initial support for decimal floating point. 2724 * Support for the __thiscall calling-convention. 2725 * Support for hot-patchable function prologues via the 2726 ms_hook_prologue attribute for x86_64 in addition to 32-bit x86. 2727 * Improvements of stack-probing and stack-allocation mechanisms. 2728 * Support of push/pop-macro pragma as preprocessor command. 2729 With #pragma push_macro("macro-name") the current definition of 2730 macro-name is saved and can be restored with #pragma 2731 pop_macro("macro-name") to its saved definition. 2732 * Enable 128-bit long double (__float128) support on MinGW and 2733 Cygwin. 2734 2735 Other significant improvements 2736 2737 Installation changes 2738 2739 * An install-strip make target is provided that installs stripped 2740 executables, and may install libraries with unneeded or debugging 2741 sections stripped. 2742 * On Power7 systems, there is a potential problem if you build the 2743 GCC compiler with a host compiler using options that enable the VSX 2744 instruction set generation. If the host compiler has been patched 2745 so that the vec_ld and vec_st builtin functions generate Altivec 2746 memory instructions instead of VSX memory instructions, then you 2747 should be able to build the compiler with VSX instruction 2748 generation. 2749 2750 Changes for GCC Developers 2751 2752 Note: these changes concern developers that develop GCC itself or 2753 software that integrates with GCC, such as plugins, and not the general 2754 GCC users. 2755 * The gengtype utility, which previously was internal to the GCC 2756 build process, has been enchanced to provide GC root information 2757 for plugins as necessary. 2758 * The old GC allocation interface of ggc_alloc and friends was 2759 replaced with a type-safe alternative. 2760 2761 GCC 4.6.1 2762 2763 This is the [20]list of problem reports (PRs) from GCC's bug tracking 2764 system that are known to be fixed in the 4.6.1 release. This list might 2765 not be complete (that is, it is possible that some PRs that have been 2766 fixed are not listed here). 2767 2768 GCC 4.6.2 2769 2770 This is the [21]list of problem reports (PRs) from GCC's bug tracking 2771 system that are known to be fixed in the 4.6.2 release. This list might 2772 not be complete (that is, it is possible that some PRs that have been 2773 fixed are not listed here). 2774 2775 GCC 4.6.3 2776 2777 This is the [22]list of problem reports (PRs) from GCC's bug tracking 2778 system that are known to be fixed in the 4.6.3 release. This list might 2779 not be complete (that is, it is possible that some PRs that have been 2780 fixed are not listed here). 2781 2782 GCC 4.6.4 2783 2784 This is the [23]list of problem reports (PRs) from GCC's bug tracking 2785 system that are known to be fixed in the 4.6.4 release. This list might 2786 not be complete (that is, it is possible that some PRs that have been 2787 fixed are not listed here). 2788 2789 2790 For questions related to the use of GCC, please consult these web 2791 pages and the [24]GCC manuals. If that fails, the 2792 [25]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 2793 web pages and the development of GCC are welcome on our developer 2794 list at [26]gcc (a] gcc.gnu.org. All of [27]our lists have public 2795 archives. 2796 2797 Copyright (C) [28]Free Software Foundation, Inc. Verbatim copying and 2798 distribution of this entire article is permitted in any medium, 2799 provided this notice is preserved. 2800 2801 These pages are [29]maintained by the GCC team. Last modified 2802 2014-12-06[30]. 2803 2804 References 2805 2806 1. http://sourceware.org/bugzilla/show_bug.cgi?id=10401 2807 2. http://gcc.gnu.org/gcc-4.5/changes.html 2808 3. http://gcc.gnu.org/gcc-4.5/changes.html#obsoleted 2809 4. http://gcc.gnu.org/gcc-4.6/porting_to.html 2810 5. http://gcc.gnu.org/projects/lto/whopr.pdf 2811 6. https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options 2812 7. http://gcc.gnu.org/gcc-4.6/cxx0x_status.html 2813 8. https://gcc.gnu.org/PR43145 2814 9. https://gcc.gnu.org/PR43680 2815 10. https://gcc.gnu.org/PR33558 2816 11. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#253 2817 12. https://gcc.gnu.org/onlinedocs/gcc-4.6.4/libstdc++/manual/manual/status.html#status.iso.200x 2818 13. https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html 2819 14. https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.races 2820 15. https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html 2821 16. https://gcc.gnu.org/wiki/OOP 2822 17. https://gcc.gnu.org/wiki/Coarray 2823 18. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfcoarray_007d-233 2824 19. http://golang.org/ 2825 20. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.1 2826 21. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.2 2827 22. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.3 2828 23. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.4 2829 24. https://gcc.gnu.org/onlinedocs/ 2830 25. mailto:gcc-help (a] gcc.gnu.org 2831 26. mailto:gcc (a] gcc.gnu.org 2832 27. https://gcc.gnu.org/lists.html 2833 28. http://www.fsf.org/ 2834 29. https://gcc.gnu.org/about.html 2835 30. http://validator.w3.org/check/referer 2836 ====================================================================== 2837 http://gcc.gnu.org/gcc-4.5/index.html 2838 2839 GCC 4.5 Release Series 2840 2841 Jul 2, 2012 2842 2843 The [1]GNU project and the GCC developers are pleased to announce the 2844 release of GCC 4.5.4. 2845 2846 This release is a bug-fix release, containing fixes for regressions in 2847 GCC 4.5.3 relative to previous releases of GCC. 2848 2849 Release History 2850 2851 GCC 4.5.4 2852 Jul 2, 2012 ([2]changes) 2853 2854 GCC 4.5.3 2855 Apr 28, 2011 ([3]changes) 2856 2857 GCC 4.5.2 2858 Dec 16, 2010 ([4]changes) 2859 2860 GCC 4.5.1 2861 Jul 31, 2010 ([5]changes) 2862 2863 GCC 4.5.0 2864 April 14, 2010 ([6]changes) 2865 2866 References and Acknowledgements 2867 2868 GCC used to stand for the GNU C Compiler, but since the compiler 2869 supports several other languages aside from C, it now stands for the 2870 GNU Compiler Collection. 2871 2872 A list of [7]successful builds is updated as new information becomes 2873 available. 2874 2875 The GCC developers would like to thank the numerous people that have 2876 contributed new features, improvements, bug fixes, and other changes as 2877 well as test results to GCC. This [8]amazing group of volunteers is 2878 what makes GCC successful. 2879 2880 For additional information about GCC please refer to the [9]GCC project 2881 web site or contact the [10]GCC development mailing list. 2882 2883 To obtain GCC please use [11]our mirror sites or [12]our SVN server. 2884 2885 2886 For questions related to the use of GCC, please consult these web 2887 pages and the [13]GCC manuals. If that fails, the 2888 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 2889 web pages and the development of GCC are welcome on our developer 2890 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 2891 archives. 2892 2893 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 2894 distribution of this entire article is permitted in any medium, 2895 provided this notice is preserved. 2896 2897 These pages are [18]maintained by the GCC team. Last modified 2898 2014-06-28[19]. 2899 2900 References 2901 2902 1. http://www.gnu.org/ 2903 2. http://gcc.gnu.org/gcc-4.5/changes.html 2904 3. http://gcc.gnu.org/gcc-4.5/changes.html 2905 4. http://gcc.gnu.org/gcc-4.5/changes.html 2906 5. http://gcc.gnu.org/gcc-4.5/changes.html 2907 6. http://gcc.gnu.org/gcc-4.5/changes.html 2908 7. http://gcc.gnu.org/gcc-4.5/buildstat.html 2909 8. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 2910 9. http://gcc.gnu.org/index.html 2911 10. mailto:gcc (a] gcc.gnu.org 2912 11. http://gcc.gnu.org/mirrors.html 2913 12. http://gcc.gnu.org/svn.html 2914 13. https://gcc.gnu.org/onlinedocs/ 2915 14. mailto:gcc-help (a] gcc.gnu.org 2916 15. mailto:gcc (a] gcc.gnu.org 2917 16. https://gcc.gnu.org/lists.html 2918 17. http://www.fsf.org/ 2919 18. https://gcc.gnu.org/about.html 2920 19. http://validator.w3.org/check/referer 2921 ====================================================================== 2922 http://gcc.gnu.org/gcc-4.5/changes.html 2923 2924 GCC 4.5 Release Series 2925 Changes, New Features, and Fixes 2926 2927 Caveats 2928 2929 * GCC now requires the [1]MPC library in order to build. See the 2930 [2]prerequisites page for version requirements. 2931 * Support for a number of older systems and recently unmaintained or 2932 untested target ports of GCC has been declared obsolete in GCC 4.5. 2933 Unless there is activity to revive them, the next release of GCC 2934 will have their sources permanently removed. 2935 The following ports for individual systems on particular 2936 architectures have been obsoleted: 2937 + IRIX releases before 6.5 (mips-sgi-irix5*, 2938 mips-sgi-irix6.[0-4]) 2939 + Solaris 7 (*-*-solaris2.7) 2940 + Tru64 UNIX releases before V5.1 (alpha*-dec-osf4*, 2941 alpha-dec-osf5.0*) 2942 + Details for the IRIX, Solaris 7, and Tru64 UNIX obsoletions 2943 can be found in the [3]announcement. 2944 Support for the classic POWER architecture implemented in the 2945 original RIOS and RIOS2 processors of the old IBM RS/6000 product 2946 line has been obsoleted in the rs6000 port. This does not affect 2947 the new generation Power and PowerPC architectures. 2948 * Support has been removed for all the [4]configurations obsoleted in 2949 GCC 4.4. 2950 * Support has been removed for the protoize and unprotoize utilities, 2951 obsoleted in GCC 4.4. 2952 * Support has been removed for tuning for Itanium1 (Merced) variants. 2953 Note that code tuned for Itanium2 should also run correctly on 2954 Itanium1. 2955 * GCC now generates unwind info also for epilogues. DWARF debuginfo 2956 generated by GCC now uses more features of DWARF3 than before, and 2957 also some DWARF4 features. GDB older than 7.0 is not able to handle 2958 either of these, so to debug GCC 4.5 generated binaries or 2959 libraries GDB 7.0 or later is needed. You can disable use of DWARF4 2960 features with the -gdwarf-3 -gstrict-dwarf options, or use 2961 -gdwarf-2 -gstrict-dwarf to restrict GCC to just DWARF2, but 2962 epilogue unwind info is emitted unconditionally whenever unwind 2963 info is emitted. 2964 * On x86 targets, code containing floating-point calculations may run 2965 significantly slower when compiled with GCC 4.5 in strict C99 2966 conformance mode than they did with earlier GCC versions. This is 2967 due to stricter standard conformance of the compiler and can be 2968 avoided by using the option -fexcess-precision=fast; also see 2969 [5]below. 2970 * The function attribute noinline no longer prevents GCC from cloning 2971 the function. A new attribute noclone has been introduced for this 2972 purpose. Cloning a function means that it is duplicated and the new 2973 copy is specialized for certain contexts (for example when a 2974 parameter is a known constant). 2975 2976 General Optimizer Improvements 2977 2978 * The -save-temps now takes an optional argument. The -save-temps and 2979 -save-temps=cwd switches write the temporary files in the current 2980 working directory based on the original source file. The 2981 -save-temps=obj switch will write files into the directory 2982 specified with the -o option, and the intermediate filenames are 2983 based on the output file. This will allow the user to get the 2984 compiler intermediate files when doing parallel builds without two 2985 builds of the same filename located in different directories from 2986 interfering with each other. 2987 * Debugging dumps are now created in the same directory as the object 2988 file rather than in the current working directory. This allows the 2989 user to get debugging dumps when doing parallel builds without two 2990 builds of the same filename interfering with each other. 2991 * GCC has been integrated with the [6]MPC library. This allows GCC to 2992 evaluate complex arithmetic at compile time [7]more accurately. It 2993 also allows GCC to evaluate calls to complex built-in math 2994 functions having constant arguments and replace them at compile 2995 time with their mathematically equivalent results. In doing so, GCC 2996 can generate correct results regardless of the math library 2997 implementation or floating point precision of the host platform. 2998 This also allows GCC to generate identical results regardless of 2999 whether one compiles in native or cross-compile configurations to a 3000 particular target. The following built-in functions take advantage 3001 of this new capability: cacos, cacosh, casin, casinh, catan, 3002 catanh, ccos, ccosh, cexp, clog, cpow, csin, csinh, csqrt, ctan, 3003 and ctanh. The float and long double variants of these functions 3004 (e.g. csinf and csinl) are also handled. 3005 * A new link-time optimizer has been added ([8]-flto). When this 3006 option is used, GCC generates a bytecode representation of each 3007 input file and writes it to specially-named sections in each object 3008 file. When the object files are linked together, all the function 3009 bodies are read from these named sections and instantiated as if 3010 they had been part of the same translation unit. This enables 3011 interprocedural optimizations to work across different files (and 3012 even different languages), potentially improving the performance of 3013 the generated code. To use the link-timer optimizer, -flto needs to 3014 be specified at compile time and during the final link. If the 3015 program does not require any symbols to be exported, it is possible 3016 to combine -flto and the experimental [9]-fwhopr with 3017 [10]-fwhole-program to allow the interprocedural optimizers to use 3018 more aggressive assumptions. 3019 * The automatic parallelization pass was enhanced to support 3020 parallelization of outer loops. 3021 * Automatic parallelization can be enabled as part of Graphite. In 3022 addition to -ftree-parallelize-loops=, specify 3023 -floop-parallelize-all to enable the Graphite-based optimization. 3024 * The infrastructure for optimizing based on [11]restrict qualified 3025 pointers has been rewritten and should result in code generation 3026 improvements. Optimizations based on restrict qualified pointers 3027 are now also available when using -fno-strict-aliasing. 3028 * There is a new optimization pass that attempts to change prototype 3029 of functions to avoid unused parameters, pass only relevant parts 3030 of structures and turn arguments passed by reference to arguments 3031 passed by value when possible. It is enabled by -O2 and above as 3032 well as -Os and can be manually invoked using the new command-line 3033 switch -fipa-sra. 3034 * GCC now optimize exception handling code. In particular cleanup 3035 regions that are proved to not have any effect are optimized out. 3036 3037 New Languages and Language specific improvements 3038 3039 All languages 3040 3041 * The -fshow-column option is now on by default. This means error 3042 messages now have a column associated with them. 3043 3044 Ada 3045 3046 * Compilation of programs heavily using discriminated record types 3047 with variant parts has been sped up and generates more compact 3048 code. 3049 * Stack checking now works reasonably well on most plaforms. In some 3050 specific cases, stack overflows may still fail to be detected, but 3051 a compile-time warning will be issued for these cases. 3052 3053 C family 3054 3055 * If a header named in a #include directive is not found, the 3056 compiler exits immediately. This avoids a cascade of errors arising 3057 from declarations expected to be found in that header being 3058 missing. 3059 * A new built-in function __builtin_unreachable() has been added that 3060 tells the compiler that control will never reach that point. It may 3061 be used after asm statements that terminate by transferring control 3062 elsewhere, and in other places that are known to be unreachable. 3063 * The -Wlogical-op option now warns for logical expressions such as 3064 (c == 1 && c == 2) and (c != 1 || c != 2), which are likely to be 3065 mistakes. This option is disabled by default. 3066 * An asm goto feature has been added to allow asm statements that 3067 jump to C labels. 3068 * C++0x raw strings are supported for C++ and for C with -std=gnu99. 3069 * The deprecated attribute now takes an optional string argument, for 3070 example, __attribute__((deprecated("text string"))), that will be 3071 printed together with the deprecation warning. 3072 3073 C 3074 3075 * The -Wenum-compare option, which warns when comparing values of 3076 different enum types, now works for C. It formerly only worked for 3077 C++. This warning is enabled by -Wall. It may be avoided by using a 3078 type cast. 3079 * The -Wcast-qual option now warns about casts which are unsafe in 3080 that they permit const-correctness to be violated without further 3081 warnings. Specifically, it warns about cases where a qualifier is 3082 added when all the lower types are not const. For example, it warns 3083 about a cast from char ** to const char **. 3084 * The -Wc++-compat option is significantly improved. It issues new 3085 warnings for: 3086 + Using C++ reserved operator names as identifiers. 3087 + Conversions to enum types without explicit casts. 3088 + Using va_arg with an enum type. 3089 + Using different enum types in the two branches of ?:. 3090 + Using ++ or -- on a variable of enum type. 3091 + Using the same name as both a struct, union or enum tag and a 3092 typedef, unless the typedef refers to the tagged type itself. 3093 + Using a struct, union, or enum which is defined within another 3094 struct or union. 3095 + A struct field defined using a typedef if there is a field in 3096 the struct, or an enclosing struct, whose name is the typedef 3097 name. 3098 + Duplicate definitions at file scope. 3099 + Uninitialized const variables. 3100 + A global variable with an anonymous struct, union, or enum 3101 type. 3102 + Using a string constant to initialize a char array whose size 3103 is the length of the string. 3104 * The new -Wjump-misses-init option warns about cases where a goto or 3105 switch skips the initialization of a variable. This sort of branch 3106 is an error in C++ but not in C. This warning is enabled by 3107 -Wc++-compat. 3108 * GCC now ensures that a C99-conforming <stdint.h> is present on most 3109 targets, and uses information about the types in this header to 3110 implement the Fortran bindings to those types. GCC does not ensure 3111 the presence of such a header, and does not implement the Fortran 3112 bindings, on the following targets: NetBSD, VxWorks, VMS, 3113 SymbianOS, WinCE, LynxOS, Netware, QNX, Interix, TPF. 3114 * GCC now implements C90- and C99-conforming rules for constant 3115 expressions. This may cause warnings or errors for some code using 3116 expressions that can be folded to a constant but are not constant 3117 expressions as defined by ISO C. 3118 * All known target-independent C90 and C90 Amendment 1 conformance 3119 bugs, and all known target-independent C99 conformance bugs not 3120 related to floating point or extended identifiers, have been fixed. 3121 * The C decimal floating point support now includes support for the 3122 FLOAT_CONST_DECIMAL64 pragma. 3123 * The named address space feature from ISO/IEC TR 18037 is now 3124 supported. This is currently only implemented for the SPU 3125 processor. 3126 3127 C++ 3128 3129 * Improved [12]experimental support for the upcoming C++0x ISO C++ 3130 standard, including support for raw strings, lambda expressions and 3131 explicit type conversion operators. 3132 * When printing the name of a class template specialization, G++ will 3133 now omit any template arguments which come from default template 3134 arguments. This behavior (and the pretty-printing of function 3135 template specializations as template signature and arguments) can 3136 be disabled with the -fno-pretty-templates option. 3137 * Access control is now applied to typedef names used in a template, 3138 which may cause G++ to reject some ill-formed code that was 3139 accepted by earlier releases. The -fno-access-control option can be 3140 used as a temporary workaround until the code is corrected. 3141 * Compilation time for code that uses templates should now scale 3142 linearly with the number of instantiations rather than 3143 quadratically, as template instantiations are now looked up using 3144 hash tables. 3145 * Declarations of functions that look like builtin declarations of 3146 library functions are only considered to be redeclarations if they 3147 are declared with extern "C". This may cause problems with code 3148 that omits extern "C" on hand-written declarations of C library 3149 functions such as abort or memcpy. Such code is ill-formed, but was 3150 accepted by earlier releases. 3151 * Diagnostics that used to complain about passing non-POD types to 3152 ... or jumping past the declaration of a non-POD variable now check 3153 for triviality rather than PODness, as per C++0x. 3154 * In C++0x mode local and anonymous classes are now allowed as 3155 template arguments, and in declarations of variables and functions 3156 with linkage, so long as any such declaration that is used is also 3157 defined ([13]DR 757). 3158 * Labels may now have attributes, as has been permitted for a while 3159 in C. This is only permitted when the label definition and the 3160 attribute specifier is followed by a semicolon--i.e., the label 3161 applies to an empty statement. The only useful attribute for a 3162 label is unused. 3163 * G++ now implements [14]DR 176. Previously G++ did not support using 3164 the injected-class-name of a template base class as a type name, 3165 and lookup of the name found the declaration of the template in the 3166 enclosing scope. Now lookup of the name finds the 3167 injected-class-name, which can be used either as a type or as a 3168 template, depending on whether or not the name is followed by a 3169 template argument list. As a result of this change, some code that 3170 was previously accepted may be ill-formed because 3171 1. The injected-class-name is not accessible because it's from a 3172 private base, or 3173 2. The injected-class-name cannot be used as an argument for a 3174 template template parameter. 3175 In either of these cases, the code can be fixed by adding a 3176 nested-name-specifier to explicitly name the template. The first 3177 can be worked around with -fno-access-control; the second is only 3178 rejected with -pedantic. 3179 * A new standard mangling for SIMD vector types has been added, to 3180 avoid name clashes on systems with vectors of varying length. By 3181 default the compiler still uses the old mangling, but emits aliases 3182 with the new mangling on targets that support strong aliases. Users 3183 can switch over entirely to the new mangling with -fabi-version=4 3184 or -fabi-version=0. -Wabi will now warn about code that uses the 3185 old mangling. 3186 * The command-line option -ftemplate-depth-N is now written as 3187 -ftemplate-depth=N and the old form is deprecated. 3188 * Conversions between NULL and non-pointer types are now warned by 3189 default. The new option -Wno-conversion-null disables these 3190 warnings. Previously these warnings were only available when using 3191 -Wconversion explicitly. 3192 3193 Runtime Library (libstdc++) 3194 3195 * Improved experimental support for the upcoming ISO C++ standard, 3196 C++0x, including: 3197 + Support for <future>, <functional>, and <random>. 3198 + Existing facilities now exploit explicit operators and the 3199 newly implemented core C++0x features. 3200 + The header <cstdatomic> has been renamed to <atomic>. 3201 * An experimental [15]profile mode has been added. This is an 3202 implementation of many C++ standard library constructs with an 3203 additional analysis layer that gives performance improvement advice 3204 based on recognition of suboptimal usage patterns. For example, 3205 #include <vector> 3206 int main() 3207 { 3208 std::vector<int> v; 3209 for (int k = 0; k < 1024; ++k) 3210 v.insert(v.begin(), k); 3211 } 3212 3213 When instrumented via the profile mode, can return suggestions 3214 about the initial size and choice of the container used as follows: 3215 vector-to-list: improvement = 5: call stack = 0x804842c ... 3216 : advice = change std::vector to std::list 3217 vector-size: improvement = 3: call stack = 0x804842c ... 3218 : advice = change initial container size from 0 to 1024 3219 3220 These constructs can be substituted for the normal libstdc++ 3221 constructs on a piecemeal basis, or all existing components can be 3222 transformed via the -D_GLIBCXX_PROFILE macro. 3223 * [16]Support for decimal floating-point arithmetic (aka ISO C++ TR 3224 24733) has been added. This support is in header file 3225 <decimal/decimal>, uses namespace std::decimal, and includes 3226 classes decimal32, decimal64, and decimal128. 3227 * Sources have been audited for application of function attributes 3228 nothrow, const, pure, and noreturn. 3229 * Python pretty-printers have been added for many standard library 3230 components that simplify the internal representation and present a 3231 more intuitive view of components when used with 3232 appropriately-advanced versions of GDB. For more information, 3233 please consult the more [17]detailed description. 3234 * The default behavior for comparing typeinfo names has changed, so 3235 in <typeinfo>, __GXX_MERGED_TYPEINFO_NAMES now defaults to zero. 3236 * The new -static-libstdc++ option directs g++ to link the C++ 3237 library statically, even if the default would normally be to link 3238 it dynamically. 3239 3240 Fortran 3241 3242 * The COMMON default padding has been changed - instead of adding the 3243 padding before a variable it is now added afterwards, which 3244 increases the compatibility with other vendors and helps to obtain 3245 the correct output in some cases. Cf. also the -falign-commons 3246 option ([18]added in 4.4). 3247 * The -finit-real= option now also supports the value snan for 3248 signalling not-a-number; to be effective, one additionally needs to 3249 enable trapping (e.g. via -ffpe-trap=). Note: Compile-time 3250 optimizations can turn a signalling NaN into a quiet one. 3251 * The new option -fcheck= has been added with the options bounds, 3252 array-temps, do, pointer, and recursive. The bounds and array-temps 3253 options are equivalent to -fbounds-check and 3254 -fcheck-array-temporaries. The do option checks for invalid 3255 modification of loop iteration variables, and the recursive option 3256 tests for recursive calls to subroutines/functions which are not 3257 marked as recursive. With pointer pointer association checks in 3258 calls are performed; however, neither undefined pointers nor 3259 pointers in expressions are handled. Using -fcheck=all enables all 3260 these run-time checks. 3261 * The run-time checking -fcheck=bounds now warns about invalid string 3262 lengths of character dummy arguments. Additionally, more 3263 compile-time checks have been added. 3264 * The new option [19]-fno-protect-parens has been added; if set, the 3265 compiler may reorder REAL and COMPLEX expressions without regard to 3266 parentheses. 3267 * GNU Fortran no longer links against libgfortranbegin. As before, 3268 MAIN__ (assembler symbol name) is the actual Fortran main program, 3269 which is invoked by the main function. However, main is now 3270 generated and put in the same object file as MAIN__. For the time 3271 being, libgfortranbegin still exists for backward compatibility. 3272 For details see the new [20]Mixed-Language Programming chapter in 3273 the manual. 3274 * The I/O library was restructured for performance and cleaner code. 3275 * Array assignments and WHERE are now run in parallel when OpenMP's 3276 WORKSHARE is used. 3277 * The experimental option -fwhole-file was added. The option allows 3278 whole-file checking of procedure arguments and allows for better 3279 optimizations. It can also be used with -fwhole-program, which is 3280 now also supported in gfortran. 3281 * More Fortran 2003 and Fortran 2008 mathematical functions can now 3282 be used as initialization expressions. 3283 * Some extended attributes such as STDCALL are now supported via the 3284 [21]GCC$ compiler directive. 3285 * For Fortran 77 compatibility: If -fno-sign-zero is used, the SIGN 3286 intrinsic behaves now as if zero were always positive. 3287 * For legacy compatibiliy: On Cygwin and MinGW, the special files 3288 CONOUT$ and CONIN$ (and CONERR$ which maps to CONOUT$) are now 3289 supported. 3290 * Fortran 2003 support has been extended: 3291 + Procedure-pointer function results and procedure-pointer 3292 components (including PASS), 3293 + allocatable scalars (experimental), 3294 + DEFERRED type-bound procedures, 3295 + the ERRMSG= argument of the ALLOCATE and DEALLOCATE statements 3296 have been implemented. 3297 + The ALLOCATE statement supports type-specs and the SOURCE= 3298 argument. 3299 + OPERATOR(*) and ASSIGNMENT(=) are now allowed as GENERIC 3300 type-bound procedure (i.e. as type-bound operators). 3301 + Rounding (ROUND=, RZ, ...) for output is now supported. 3302 + The INT_FAST{8,16,32,64,128}_T kind type parameters of the 3303 intrinsic module ISO_C_BINDING are now supported, except for 3304 the targets listed above as ones where GCC does not have 3305 <stdint.h> type information. 3306 + Extensible derived types with type-bound procedure or 3307 procedure pointer with PASS attribute now have to use CLASS in 3308 line with the Fortran 2003 standard; the workaround to use 3309 TYPE is no longer supported. 3310 + [22]Experimental, incomplete support for polymorphism, 3311 including CLASS, SELECT TYPE and dynamic dispatch of 3312 type-bound procedure calls. Some features do not work yet such 3313 as unlimited polymorphism (CLASS(*)). 3314 * Fortran 2008 support has been extended: 3315 + The OPEN statement now supports the NEWUNIT= option, which 3316 returns a unique file unit, thus preventing inadvertent use of 3317 the same unit in different parts of the program. 3318 + Support for unlimited format items has been added. 3319 + The INT{8,16,32} and REAL{32,64,128} kind type parameters of 3320 the intrinsic module ISO_FORTRAN_ENV are now supported. 3321 + Using complex arguments with TAN, SINH, COSH, TANH, ASIN, 3322 ACOS, and ATAN is now possible; the functions ASINH, ACOSH, 3323 and ATANH have been added (for real and complex arguments) and 3324 ATAN(Y,X) is now an alias for ATAN2(Y,X). 3325 + The BLOCK construct has been implemented. 3326 3327 New Targets and Target Specific Improvements 3328 3329 AIX 3330 3331 * Full cross-toolchain support now available with GNU Binutils 3332 3333 ARM 3334 3335 * GCC now supports the Cortex-M0 and Cortex-A5 processors. 3336 * GCC now supports the ARM v7E-M architecture. 3337 * GCC now supports VFPv4-based FPUs and FPUs with 3338 single-precision-only VFP. 3339 * GCC has many improvements to optimization for other ARM processors, 3340 including scheduling support for the integer pipeline on Cortex-A9. 3341 * GCC now supports the IEEE 754-2008 half-precision floating-point 3342 type, and a variant ARM-specific half-precision type. This type is 3343 specified using __fp16, with the layout determined by 3344 -mfp16-format. With appropriate -mfpu options, the Cortex-A9 and 3345 VFPv4 half-precision instructions will be used. 3346 * GCC now supports the variant of AAPCS that uses VFP registers for 3347 parameter passing and return values. 3348 3349 AVR 3350 3351 * The -mno-tablejump option has been removed because it has the same 3352 effect as the -fno-jump-tables option. 3353 * Added support for these new AVR devices: 3354 + ATmega8U2 3355 + ATmega16U2 3356 + ATmega32U2 3357 3358 IA-32/x86-64 3359 3360 * GCC now will set the default for -march= based on the configure 3361 target. 3362 * GCC now supports handling floating-point excess precision arising 3363 from use of the x87 floating-point unit in a way that conforms to 3364 ISO C99. This is enabled with -fexcess-precision=standard and with 3365 standards conformance options such as -std=c99, and may be disabled 3366 using -fexcess-precision=fast. 3367 * Support for the Intel Atom processor is now available through the 3368 -march=atom and -mtune=atom options. 3369 * A new -mcrc32 option is now available to enable crc32 intrinsics. 3370 * A new -mmovbe option is now available to enable GCC to use the 3371 movbe instruction to implement __builtin_bswap32 and 3372 __builtin_bswap64. 3373 * SSE math now can be enabled by default at configure time with the 3374 new --with-fpmath=sse option. 3375 * There is a new intrinsic header file, <x86intrin.h>. It should be 3376 included before using any IA-32/x86-64 intrinsics. 3377 * Support for the XOP, FMA4, and LWP instruction sets for the AMD 3378 Orochi processors are now available with the -mxop, -mfma4, and 3379 -mlwp options. 3380 * The -mabm option enables GCC to use the popcnt and lzcnt 3381 instructions on AMD processors. 3382 * The -mpopcnt option enables GCC to use the popcnt instructions on 3383 both AMD and Intel processors. 3384 3385 M68K/ColdFire 3386 3387 * GCC now supports ColdFire 51xx, 5221x, 5225x, 52274, 52277, 5301x 3388 and 5441x devices. 3389 * GCC now supports thread-local storage (TLS) on M68K and ColdFire 3390 processors. 3391 3392 MeP 3393 3394 Support has been added for the Toshiba Media embedded Processor (MeP, 3395 or mep-elf) embedded target. 3396 3397 MIPS 3398 3399 * GCC now supports MIPS 1004K processors. 3400 * GCC can now be configured with options --with-arch-32, 3401 --with-arch-64, --with-tune-32 and --with-tune-64 to control the 3402 default optimization separately for 32-bit and 64-bit modes. 3403 * MIPS targets now support an alternative _mcount interface, in which 3404 register $12 points to the function's save slot for register $31. 3405 This interface is selected by the -mcount-ra-address option; see 3406 the documentation for more details. 3407 * GNU/Linux targets can now generate read-only .eh_frame sections. 3408 This optimization requires GNU binutils 2.20 or above, and is only 3409 available if GCC is configured with a suitable version of binutils. 3410 * GNU/Linux targets can now attach special relocations to indirect 3411 calls, so that the linker can turn them into direct jumps or 3412 branches. This optimization requires GNU binutils 2.20 or later, 3413 and is automatically selected if GCC is configured with an 3414 appropriate version of binutils. It can be explicitly enabled or 3415 disabled using the -mrelax-pic-calls command-line option. 3416 * GCC now generates more heavily-optimized atomic operations on 3417 Octeon processors. 3418 * MIPS targets now support the -fstack-protector option. 3419 * GCC now supports an -msynci option, which specifies that synci is 3420 enough to flush the instruction cache, without help from the 3421 operating system. GCC uses this information to optimize 3422 automatically-generated cache flush operations, such as those used 3423 for nested functions in C. There is also a --with-synci 3424 configure-time option, which makes -msynci the default. 3425 * GCC supports four new function attributes for interrupt handlers: 3426 interrupt, use_shadow_register_set, keep_interrupts_masked and 3427 use_debug_exception_return. See the documentation for more details 3428 about these attributes. 3429 3430 RS/6000 (POWER/PowerPC) 3431 3432 * GCC now supports the Power ISA 2.06, which includes the VSX 3433 instructions that add vector 64-bit floating point support, new 3434 population count instructions, and conversions between floating 3435 point and unsigned types. 3436 * Support for the power7 processor is now available through the 3437 -mcpu=power7 and -mtune=power7. 3438 * GCC will now vectorize loops that contain simple math functions 3439 like copysign when generating code for altivec or VSX targets. 3440 * Support for the A2 processor is now available through the -mcpu=a2 3441 and -mtune=a2 options. 3442 * Support for the 476 processor is now available through the 3443 -mcpu={476,476fp} and -mtune={476,476fp} options. 3444 * Support for the e500mc64 processor is now available through the 3445 -mcpu=e500mc64 and -mtune=e500mc64 options. 3446 * GCC can now be configured with options --with-cpu-32, 3447 --with-cpu-64, --with-tune-32 and --with-tune-64 to control the 3448 default optimization separately for 32-bit and 64-bit modes. 3449 * Starting with GCC 4.5.4, vectors of type vector long long or vector 3450 long are passed and returned in the same method as other vectors 3451 with the VSX instruction set. Previously the GCC compiler did not 3452 adhere to the ABI for 128-bit vectors with 64-bit integer base 3453 types (PR 48857). This is also fixed in the GCC 4.6.1 release. 3454 3455 RX 3456 3457 Support has been added for the Renesas RX Processor (rx-elf) target. 3458 3459 Operating Systems 3460 3461 Windows (Cygwin and MinGW) 3462 3463 * GCC now installs all the major language runtime libraries as DLLs 3464 when configured with the --enable-shared option. 3465 * GCC now makes use of the new support for aligned common variables 3466 in versions of binutils >= 2.20 to fix bugs in the support for SSE 3467 data types. 3468 * Improvements to the libffi support library increase the reliability 3469 of code generated by GCJ on all Windows platforms. Libgcj is 3470 enabled by default for the first time. 3471 * Libtool improvements simplify installation by placing the generated 3472 DLLs in the correct binaries directory. 3473 * Numerous other minor bugfixes and improvements, and substantial 3474 enhancements to the Fortran language support library. 3475 3476 > 3477 3478 Other significant improvements 3479 3480 Plugins 3481 3482 * It is now possible to extend the compiler without having to modify 3483 its source code. A new option -fplugin=file.so tells GCC to load 3484 the shared object file.so and execute it as part of the compiler. 3485 The internal documentation describes the details on how plugins can 3486 interact with the compiler. 3487 3488 Installation changes 3489 3490 * The move to newer autotools changed default installation 3491 directories and switches to control them: The --with-datarootdir, 3492 --with-docdir, --with-pdfdir, and --with-htmldir switches are not 3493 used any more. Instead, you can now use --datarootdir, --docdir, 3494 --htmldir, and --pdfdir. The default installation directories have 3495 changed as follows according to the GNU Coding Standards: 3496 3497 datarootdir read-only architecture-independent data root [PREFIX/share] 3498 localedir locale-specific message catalogs [DATAROOTDIR/locale] 3499 docdir documentation root [DATAROOTDIR/doc/PACKAGE] 3500 htmldir html documentation [DOCDIR] 3501 dvidir dvi documentation [DOCDIR] 3502 pdfdir pdf documentation [DOCDIR] 3503 psdir ps documentation [DOCDIR] 3504 The following variables have new default values: 3505 3506 datadir read-only architecture-independent data [DATAROOTDIR] 3507 infodir info documentation [DATAROOTDIR/info] 3508 mandir man documentation [DATAROOTDIR/man] 3509 3510 GCC 4.5.1 3511 3512 This is the [23]list of problem reports (PRs) from GCC's bug tracking 3513 system that are known to be fixed in the 4.5.1 release. This list might 3514 not be complete (that is, it is possible that some PRs that have been 3515 fixed are not listed here). 3516 3517 All languages 3518 3519 * GCC's new link-time optimizer ([24]-flto) now also works on a few 3520 non-ELF targets: 3521 + Cygwin (*-cygwin*) 3522 + MinGW (*-mingw*) 3523 + Darwin on x86-64 (x86_64-apple-darwin*) 3524 LTO is not enabled by default for these targets. To enable LTO, you 3525 should configure with the --enable-lto option. 3526 3527 GCC 4.5.2 3528 3529 This is the [25]list of problem reports (PRs) from GCC's bug tracking 3530 system that are known to be fixed in the 4.5.2 release. This list might 3531 not be complete (that is, it is possible that some PRs that have been 3532 fixed are not listed here). 3533 3534 GCC 4.5.3 3535 3536 This is the [26]list of problem reports (PRs) from GCC's bug tracking 3537 system that are known to be fixed in the 4.5.3 release. This list might 3538 not be complete (that is, it is possible that some PRs that have been 3539 fixed are not listed here). 3540 3541 On the PowerPC compiler, the Altivec builtin functions vec_ld and 3542 vec_st have been modified to generate the Altivec memory instructions 3543 LVX and STVX, even if the -mvsx option is used. In the initial GCC 4.5 3544 release, these builtin functions were changed to generate VSX memory 3545 reference instructions instead of Altivec memory instructions, but 3546 there are differences between the two instructions. If the VSX 3547 instruction set is available, you can now use the new builtin functions 3548 vec_vsx_ld and vec_vsx_st which always generates the VSX memory 3549 instructions. 3550 3551 GCC 4.5.4 3552 3553 This is the [27]list of problem reports (PRs) from GCC's bug tracking 3554 system that are known to be fixed in the 4.5.4 release. This list might 3555 not be complete (that is, it is possible that some PRs that have been 3556 fixed are not listed here). 3557 3558 3559 For questions related to the use of GCC, please consult these web 3560 pages and the [28]GCC manuals. If that fails, the 3561 [29]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 3562 web pages and the development of GCC are welcome on our developer 3563 list at [30]gcc (a] gcc.gnu.org. All of [31]our lists have public 3564 archives. 3565 3566 Copyright (C) [32]Free Software Foundation, Inc. Verbatim copying and 3567 distribution of this entire article is permitted in any medium, 3568 provided this notice is preserved. 3569 3570 These pages are [33]maintained by the GCC team. Last modified 3571 2014-12-06[34]. 3572 3573 References 3574 3575 1. http://www.multiprecision.org/ 3576 2. https://gcc.gnu.org/install/prerequisites.html 3577 3. https://gcc.gnu.org/ml/gcc/2010-01/msg00510.html 3578 4. http://gcc.gnu.org/gcc-4.4/changes.html#obsoleted 3579 5. http://gcc.gnu.org/gcc-4.5/changes.html#x86 3580 6. http://www.multiprecision.org/ 3581 7. https://gcc.gnu.org/PR30789 3582 8. https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flto-801 3583 9. https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fwhopr-802 3584 10. https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fwhole-program-800 3585 11. https://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html 3586 12. http://gcc.gnu.org/gcc-4.5/cxx0x_status.html 3587 13. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#757 3588 14. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#176 3589 15. https://gcc.gnu.org/onlinedocs/libstdc++/manual/profile_mode.html 3590 16. https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr24733 3591 17. http://sourceware.org/gdb/wiki/STLSupport 3592 18. http://gcc.gnu.org/gcc-4.4/changes.html 3593 19. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html 3594 20. https://gcc.gnu.org/onlinedocs/gfortran/Mixed-Language-Programming.html 3595 21. https://gcc.gnu.org/onlinedocs/gfortran/GNU-Fortran-Compiler-Directives.html 3596 22. https://gcc.gnu.org/wiki/OOP 3597 23. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.1 3598 24. https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flto-801 3599 25. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.2 3600 26. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.3 3601 27. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.4 3602 28. https://gcc.gnu.org/onlinedocs/ 3603 29. mailto:gcc-help (a] gcc.gnu.org 3604 30. mailto:gcc (a] gcc.gnu.org 3605 31. https://gcc.gnu.org/lists.html 3606 32. http://www.fsf.org/ 3607 33. https://gcc.gnu.org/about.html 3608 34. http://validator.w3.org/check/referer 3609 ====================================================================== 3610 http://gcc.gnu.org/gcc-4.4/index.html 3611 3612 GCC 4.4 Release Series 3613 3614 March 13, 2012 3615 3616 The [1]GNU project and the GCC developers are pleased to announce the 3617 release of GCC 4.4.7. 3618 3619 This release is a bug-fix release, containing fixes for regressions in 3620 GCC 4.4.6 relative to previous releases of GCC. 3621 3622 Release History 3623 3624 GCC 4.4.7 3625 March 13, 2012 ([2]changes) 3626 3627 GCC 4.4.6 3628 April 16, 2011 ([3]changes) 3629 3630 GCC 4.4.5 3631 October 1, 2010 ([4]changes) 3632 3633 GCC 4.4.4 3634 April 29, 2010 ([5]changes) 3635 3636 GCC 4.4.3 3637 January 21, 2010 ([6]changes) 3638 3639 GCC 4.4.2 3640 October 15, 2009 ([7]changes) 3641 3642 GCC 4.4.1 3643 July 22, 2009 ([8]changes) 3644 3645 GCC 4.4.0 3646 April 21, 2009 ([9]changes) 3647 3648 References and Acknowledgements 3649 3650 GCC used to stand for the GNU C Compiler, but since the compiler 3651 supports several other languages aside from C, it now stands for the 3652 GNU Compiler Collection. 3653 3654 A list of [10]successful builds is updated as new information becomes 3655 available. 3656 3657 The GCC developers would like to thank the numerous people that have 3658 contributed new features, improvements, bug fixes, and other changes as 3659 well as test results to GCC. This [11]amazing group of volunteers is 3660 what makes GCC successful. 3661 3662 For additional information about GCC please refer to the [12]GCC 3663 project web site or contact the [13]GCC development mailing list. 3664 3665 To obtain GCC please use [14]our mirror sites or [15]our SVN server. 3666 3667 3668 For questions related to the use of GCC, please consult these web 3669 pages and the [16]GCC manuals. If that fails, the 3670 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 3671 web pages and the development of GCC are welcome on our developer 3672 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 3673 archives. 3674 3675 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 3676 distribution of this entire article is permitted in any medium, 3677 provided this notice is preserved. 3678 3679 These pages are [21]maintained by the GCC team. Last modified 3680 2014-06-28[22]. 3681 3682 References 3683 3684 1. http://www.gnu.org/ 3685 2. http://gcc.gnu.org/gcc-4.4/changes.html 3686 3. http://gcc.gnu.org/gcc-4.4/changes.html 3687 4. http://gcc.gnu.org/gcc-4.4/changes.html 3688 5. http://gcc.gnu.org/gcc-4.4/changes.html 3689 6. http://gcc.gnu.org/gcc-4.4/changes.html 3690 7. http://gcc.gnu.org/gcc-4.4/changes.html 3691 8. http://gcc.gnu.org/gcc-4.4/changes.html 3692 9. http://gcc.gnu.org/gcc-4.4/changes.html 3693 10. http://gcc.gnu.org/gcc-4.4/buildstat.html 3694 11. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 3695 12. http://gcc.gnu.org/index.html 3696 13. mailto:gcc (a] gcc.gnu.org 3697 14. http://gcc.gnu.org/mirrors.html 3698 15. http://gcc.gnu.org/svn.html 3699 16. https://gcc.gnu.org/onlinedocs/ 3700 17. mailto:gcc-help (a] gcc.gnu.org 3701 18. mailto:gcc (a] gcc.gnu.org 3702 19. https://gcc.gnu.org/lists.html 3703 20. http://www.fsf.org/ 3704 21. https://gcc.gnu.org/about.html 3705 22. http://validator.w3.org/check/referer 3706 ====================================================================== 3707 http://gcc.gnu.org/gcc-4.4/changes.html 3708 3709 GCC 4.4 Release Series 3710 Changes, New Features, and Fixes 3711 3712 The latest release in the 4.4 release series is [1]GCC 4.4.7. 3713 3714 Caveats 3715 3716 * __builtin_stdarg_start has been completely removed from GCC. 3717 Support for <varargs.h> had been deprecated since GCC 4.0. Use 3718 __builtin_va_start as a replacement. 3719 * Some of the errors issued by the C++ front end that could be 3720 downgraded to warnings in previous releases by using -fpermissive 3721 are now warnings by default. They can be converted into errors by 3722 using -pedantic-errors. 3723 * Use of the cpp assertion extension will now emit a warning when 3724 -Wdeprecated or -pedantic is used. This extension has been 3725 deprecated for many years, but never warned about. 3726 * Packed bit-fields of type char were not properly bit-packed on many 3727 targets prior to GCC 4.4. On these targets, the fix in GCC 4.4 3728 causes an ABI change. For example there is no longer a 4-bit 3729 padding between field a and b in this structure: 3730 struct foo 3731 { 3732 char a:4; 3733 char b:8; 3734 } __attribute__ ((packed)); 3735 There is a new warning to help identify fields that are affected: 3736 foo.c:5: note: Offset of packed bit-field 'b' has changed in GCC 4.4 3737 The warning can be disabled with -Wno-packed-bitfield-compat. 3738 * On ARM EABI targets, the C++ mangling of the va_list type has been 3739 changed to conform to the current revision of the EABI. This does 3740 not affect the libstdc++ library included with GCC. 3741 * The SCOUNT and POS bits of the MIPS DSP control register are now 3742 treated as global. Previous versions of GCC treated these fields as 3743 call-clobbered instead. 3744 * The MIPS port no longer recognizes the h asm constraint. It was 3745 necessary to remove this constraint in order to avoid generating 3746 unpredictable code sequences. 3747 One of the main uses of the h constraint was to extract the high 3748 part of a multiplication on 64-bit targets. For example: 3749 asm ("dmultu\t%1,%2" : "=h" (result) : "r" (x), "r" (y)); 3750 You can now achieve the same effect using 128-bit types: 3751 typedef unsigned int uint128_t __attribute__((mode(TI))); 3752 result = ((uint128_t) x * y) >> 64; 3753 The second sequence is better in many ways. For example, if x and y 3754 are constants, the compiler can perform the multiplication at 3755 compile time. If x and y are not constants, the compiler can 3756 schedule the runtime multiplication better than it can schedule an 3757 asm statement. 3758 * Support for a number of older systems and recently unmaintained or 3759 untested target ports of GCC has been declared obsolete in GCC 4.4. 3760 Unless there is activity to revive them, the next release of GCC 3761 will have their sources permanently removed. 3762 The following ports for individual systems on particular 3763 architectures have been obsoleted: 3764 + Generic a.out on IA32 and m68k (i[34567]86-*-aout*, 3765 m68k-*-aout*) 3766 + Generic COFF on ARM, H8300, IA32, m68k and SH (arm-*-coff*, 3767 armel-*-coff*, h8300-*-*, i[34567]86-*-coff*, m68k-*-coff*, 3768 sh-*-*). This does not affect other more specific targets 3769 using the COFF object format on those architectures, or the 3770 more specific H8300 and SH targets (h8300-*-rtems*, 3771 h8300-*-elf*, sh-*-elf*, sh-*-symbianelf*, sh-*-linux*, 3772 sh-*-netbsdelf*, sh-*-rtems*, sh-wrs-vxworks). 3773 + 2BSD on PDP-11 (pdp11-*-bsd) 3774 + AIX 4.1 and 4.2 on PowerPC (rs6000-ibm-aix4.[12]*, 3775 powerpc-ibm-aix4.[12]*) 3776 + Tuning support for Itanium1 (Merced) variants. Note that code 3777 tuned for Itanium2 should also run correctly on Itanium1. 3778 * The protoize and unprotoize utilities have been obsoleted and will 3779 be removed in GCC 4.5. These utilities have not been installed by 3780 default since GCC 3.0. 3781 * Support has been removed for all the [2]configurations obsoleted in 3782 GCC 4.3. 3783 * Unknown -Wno-* options are now silently ignored by GCC if no other 3784 diagnostics are issued. If other diagnostics are issued, then GCC 3785 warns about the unknown options. 3786 * More information on porting to GCC 4.4 from previous versions of 3787 GCC can be found in the [3]porting guide for this release. 3788 3789 General Optimizer Improvements 3790 3791 * A new command-line switch -findirect-inlining has been added. When 3792 turned on it allows the inliner to also inline indirect calls that 3793 are discovered to have known targets at compile time thanks to 3794 previous inlining. 3795 * A new command-line switch -ftree-switch-conversion has been added. 3796 This new pass turns simple initializations of scalar variables in 3797 switch statements into initializations from a static array, given 3798 that all the values are known at compile time and the ratio between 3799 the new array size and the original switch branches does not exceed 3800 the parameter --param switch-conversion-max-branch-ratio (default 3801 is eight). 3802 * A new command-line switch -ftree-builtin-call-dce has been added. 3803 This optimization eliminates unnecessary calls to certain builtin 3804 functions when the return value is not used, in cases where the 3805 calls can not be eliminated entirely because the function may set 3806 errno. This optimization is on by default at -O2 and above. 3807 * A new command-line switch -fconserve-stack directs the compiler to 3808 minimize stack usage even if it makes the generated code slower. 3809 This affects inlining decisions. 3810 * When the assembler supports it, the compiler will now emit unwind 3811 information using assembler .cfi directives. This makes it possible 3812 to use such directives in inline assembler code. The new option 3813 -fno-dwarf2-cfi-asm directs the compiler to not use .cfi 3814 directives. 3815 * The [4]Graphite branch has been merged. This merge has brought in a 3816 new framework for loop optimizations based on a polyhedral 3817 intermediate representation. These optimizations apply to all the 3818 languages supported by GCC. The following new code transformations 3819 are available in GCC 4.4: 3820 + -floop-interchange performs loop interchange transformations 3821 on loops. Interchanging two nested loops switches the inner 3822 and outer loops. For example, given a loop like: 3823 DO J = 1, M 3824 DO I = 1, N 3825 A(J, I) = A(J, I) * C 3826 ENDDO 3827 ENDDO 3828 3829 loop interchange will transform the loop as if the user had 3830 written: 3831 DO I = 1, N 3832 DO J = 1, M 3833 A(J, I) = A(J, I) * C 3834 ENDDO 3835 ENDDO 3836 3837 which can be beneficial when N is larger than the caches, 3838 because in Fortran, the elements of an array are stored in 3839 memory contiguously by column, and the original loop iterates 3840 over rows, potentially creating at each access a cache miss. 3841 + -floop-strip-mine performs loop strip mining transformations 3842 on loops. Strip mining splits a loop into two nested loops. 3843 The outer loop has strides equal to the strip size and the 3844 inner loop has strides of the original loop within a strip. 3845 For example, given a loop like: 3846 DO I = 1, N 3847 A(I) = A(I) + C 3848 ENDDO 3849 3850 loop strip mining will transform the loop as if the user had 3851 written: 3852 DO II = 1, N, 4 3853 DO I = II, min (II + 3, N) 3854 A(I) = A(I) + C 3855 ENDDO 3856 ENDDO 3857 3858 + -floop-block performs loop blocking transformations on loops. 3859 Blocking strip mines each loop in the loop nest such that the 3860 memory accesses of the element loops fit inside caches. For 3861 example, given a loop like: 3862 DO I = 1, N 3863 DO J = 1, M 3864 A(J, I) = B(I) + C(J) 3865 ENDDO 3866 ENDDO 3867 3868 loop blocking will transform the loop as if the user had 3869 written: 3870 DO II = 1, N, 64 3871 DO JJ = 1, M, 64 3872 DO I = II, min (II + 63, N) 3873 DO J = JJ, min (JJ + 63, M) 3874 A(J, I) = B(I) + C(J) 3875 ENDDO 3876 ENDDO 3877 ENDDO 3878 ENDDO 3879 3880 which can be beneficial when M is larger than the caches, 3881 because the innermost loop will iterate over a smaller amount 3882 of data that can be kept in the caches. 3883 * A new register allocator has replaced the old one. It is called 3884 integrated register allocator (IRA) because coalescing, register 3885 live range splitting, and hard register preferencing are done 3886 on-the-fly during coloring. It also has better integration with the 3887 reload pass. IRA is a regional register allocator which uses modern 3888 Chaitin-Briggs coloring instead of Chow's priority coloring used in 3889 the old register allocator. More info about IRA internals and 3890 options can be found in the GCC manuals. 3891 * A new instruction scheduler and software pipeliner, based on the 3892 selective scheduling approach, has been added. The new pass 3893 performs instruction unification, register renaming, substitution 3894 through register copies, and speculation during scheduling. The 3895 software pipeliner is able to pipeline non-countable loops. The new 3896 pass is targeted at scheduling-eager in-order platforms. In GCC 4.4 3897 it is available for the Intel Itanium platform working by default 3898 as the second scheduling pass (after register allocation) at the 3899 -O3 optimization level. 3900 * When using -fprofile-generate with a multi-threaded program, the 3901 profile counts may be slightly wrong due to race conditions. The 3902 new -fprofile-correction option directs the compiler to apply 3903 heuristics to smooth out the inconsistencies. By default the 3904 compiler will give an error message when it finds an inconsistent 3905 profile. 3906 * The new -fprofile-dir=PATH option permits setting the directory 3907 where profile data files are stored when using -fprofile-generate 3908 and friends, and the directory used when reading profile data files 3909 using -fprofile-use and friends. 3910 3911 New warning options 3912 3913 * The new -Wframe-larger-than=NUMBER option directs GCC to emit a 3914 warning if any stack frame is larger than NUMBER bytes. This may be 3915 used to help ensure that code fits within a limited amount of stack 3916 space. 3917 * The command-line option -Wlarger-than-N is now written as 3918 -Wlarger-than=N and the old form is deprecated. 3919 * The new -Wno-mudflap option disables warnings about constructs 3920 which can not be instrumented when using -fmudflap. 3921 3922 New Languages and Language specific improvements 3923 3924 * Version 3.0 of the [5]OpenMP specification is now supported for the 3925 C, C++, and Fortran compilers. 3926 * New character data types, per [6]TR 19769: New character types in 3927 C, are now supported for the C compiler in -std=gnu99 mode, as 3928 __CHAR16_TYPE__ and __CHAR32_TYPE__, and for the C++ compiler in 3929 -std=c++0x and -std=gnu++0x modes, as char16_t and char32_t too. 3930 3931 C family 3932 3933 * A new optimize attribute was added to allow programmers to change 3934 the optimization level and particular optimization options for an 3935 individual function. You can also change the optimization options 3936 via the GCC optimize pragma for functions defined after the pragma. 3937 The GCC push_options pragma and the GCC pop_options pragma allow 3938 you temporarily save and restore the options used. The GCC 3939 reset_options pragma restores the options to what was specified on 3940 the command line. 3941 * Uninitialized warnings do not require enabling optimization 3942 anymore, that is, -Wuninitialized can be used together with -O0. 3943 Nonetheless, the warnings given by -Wuninitialized will probably be 3944 more accurate if optimization is enabled. 3945 * -Wparentheses now warns about expressions such as (!x | y) and (!x 3946 & y). Using explicit parentheses, such as in ((!x) | y), silences 3947 this warning. 3948 * -Wsequence-point now warns within if, while,do while and for 3949 conditions, and within for begin/end expressions. 3950 * A new option -dU is available to dump definitions of preprocessor 3951 macros that are tested or expanded. 3952 3953 C++ 3954 3955 * [7]Improved experimental support for the upcoming ISO C++ standard, 3956 C++0x. Including support for auto, inline namespaces, generalized 3957 initializer lists, defaulted and deleted functions, new character 3958 types, and scoped enums. 3959 * Those errors that may be downgraded to warnings to build legacy 3960 code now mention -fpermissive when -fdiagnostics-show-option is 3961 enabled. 3962 * -Wconversion now warns if the result of a static_cast to enumeral 3963 type is unspecified because the value is outside the range of the 3964 enumeral type. 3965 * -Wuninitialized now warns if a non-static reference or non-static 3966 const member appears in a class without constructors. 3967 * G++ now properly implements value-initialization, so objects with 3968 an initializer of () and an implicitly defined default constructor 3969 will be zero-initialized before the default constructor is called. 3970 3971 Runtime Library (libstdc++) 3972 3973 * Improved experimental support for the upcoming ISO C++ standard, 3974 C++0x, including: 3975 + Support for <chrono>, <condition_variable>, <cstdatomic>, 3976 <forward_list>, <initializer_list>, <mutex>, <ratio>, 3977 <system_error>, and <thread>. 3978 + unique_ptr, <algorithm> additions, exception propagation, and 3979 support for the new character types in <string> and <limits>. 3980 + Existing facilities now exploit initializer lists, defaulted 3981 and deleted functions, and the newly implemented core C++0x 3982 features. 3983 + Some standard containers are more efficient together with 3984 stateful allocators, i.e., no allocator is constructed on the 3985 fly at element construction time. 3986 * Experimental support for non-standard pointer types in containers. 3987 * The long standing libstdc++/30928 has been fixed for targets 3988 running glibc 2.10 or later. 3989 * As usual, many small and larger bug fixes, in particular quite a 3990 few corner cases in <locale>. 3991 3992 Fortran 3993 3994 * GNU Fortran now employs libcpp directly instead of using cc1 as an 3995 external preprocessor. The [8]-cpp option was added to allow manual 3996 invocation of the preprocessor without relying on filename 3997 extensions. 3998 * The [9]-Warray-temporaries option warns about array temporaries 3999 generated by the compiler, as an aid to optimization. 4000 * The [10]-fcheck-array-temporaries option has been added, printing a 4001 notification at run time, when an array temporary had to be created 4002 for an function argument. Contrary to -Warray-temporaries the 4003 warning is only printed if the array is noncontiguous. 4004 * Improved generation of DWARF debugging symbols 4005 * If using an intrinsic not part of the selected standard (via -std= 4006 and -fall-intrinsics) gfortran will now treat it as if this 4007 procedure were declared EXTERNAL and try to link to a user-supplied 4008 procedure. -Wintrinsics-std will warn whenever this happens. The 4009 now-useless option -Wnonstd-intrinsic was removed. 4010 * The flag -falign-commons has been added to control the alignment of 4011 variables in COMMON blocks, which is enabled by default in line 4012 with previous GCC version. Using -fno-align-commons one can force 4013 commons to be contiguous in memory as required by the Fortran 4014 standard, however, this slows down the memory access. The option 4015 -Walign-commons, which is enabled by default, warns when padding 4016 bytes were added for alignment. The proper solution is to sort the 4017 common objects by decreasing storage size, which avoids the 4018 alignment problems. 4019 * Fortran 2003 support has been extended: 4020 + Wide characters (ISO 10646, UCS-4, kind=4) and UTF-8 I/O is 4021 now supported (except internal reads from/writes to wide 4022 strings). [11]-fbackslash now supports also \unnnn and 4023 \Unnnnnnnn to enter Unicode characters. 4024 + Asynchronous I/O (implemented as synchronous I/O) and the 4025 decimal=, size=, sign=, pad=, blank=, and delim= specifiers 4026 are now supported in I/O statements. 4027 + Support for Fortran 2003 structure constructors and for array 4028 constructor with typespec has been added. 4029 + Procedure Pointers (but not yet as component in derived types 4030 and as function results) are now supported. 4031 + Abstract types, type extension, and type-bound procedures 4032 (both PROCEDURE and GENERIC but not as operators). Note: As 4033 CLASS/polymorphyic types are not implemented, type-bound 4034 procedures with PASS accept as non-standard extension TYPE 4035 arguments. 4036 * Fortran 2008 support has been added: 4037 + The -std=f2008 option and support for the file extensions 4038 .f2008 and .F2008 has been added. 4039 + The g0 format descriptor is now supported. 4040 + The Fortran 2008 mathematical intrinsics ASINH, ACOSH, ATANH, 4041 ERF, ERFC, GAMMA, LOG_GAMMA, BESSEL_*, HYPOT, and ERFC_SCALED 4042 are now available (some of them existed as GNU extension 4043 before). Note: The hyperbolic functions are not yet supporting 4044 complex arguments and the three- argument version of BESSEL_*N 4045 is not available. 4046 + The bit intrinsics LEADZ and TRAILZ have been added. 4047 4048 Java (GCJ) 4049 4050 Ada 4051 4052 * The Ada runtime now supports multilibs on many platforms including 4053 x86_64, SPARC and PowerPC. Their build is enabled by default. 4054 4055 New Targets and Target Specific Improvements 4056 4057 ARM 4058 4059 * GCC now supports optimizing for the Cortex-A9, Cortex-R4 and 4060 Cortex-R4F processors and has many other improvements to 4061 optimization for ARM processors. 4062 * GCC now supports the VFPv3 variant with 16 double-precision 4063 registers with -mfpu=vfpv3-d16. The option -mfpu=vfp3 has been 4064 renamed to -mfpu=vfpv3. 4065 * GCC now supports the -mfix-cortex-m3-ldrd option to work around an 4066 erratum on Cortex-M3 processors. 4067 * GCC now supports the __sync_* atomic operations for ARM EABI 4068 GNU/Linux. 4069 * The section anchors optimization is now enabled by default when 4070 optimizing for ARM. 4071 * GCC now uses a new EABI-compatible profiling interface for EABI 4072 targets. This requires a function __gnu_mcount_nc, which is 4073 provided by GNU libc versions 2.8 and later. 4074 4075 AVR 4076 4077 * The -mno-tablejump option has been deprecated because it has the 4078 same effect as the -fno-jump-tables option. 4079 * Added support for these new AVR devices: 4080 + ATA6289 4081 + ATtiny13A 4082 + ATtiny87 4083 + ATtiny167 4084 + ATtiny327 4085 + ATmega8C1 4086 + ATmega16C1 4087 + ATmega32C1 4088 + ATmega8M1 4089 + ATmega16M1 4090 + ATmega32M1 4091 + ATmega32U4 4092 + ATmega16HVB 4093 + ATmega4HVD 4094 + ATmega8HVD 4095 + ATmega64C1 4096 + ATmega64M1 4097 + ATmega16U4 4098 + ATmega32U6 4099 + ATmega128RFA1 4100 + AT90PWM81 4101 + AT90SCR100 4102 + M3000F 4103 + M3000S 4104 + M3001B 4105 4106 IA-32/x86-64 4107 4108 * Support for Intel AES built-in functions and code generation is 4109 available via -maes. 4110 * Support for Intel PCLMUL built-in function and code generation is 4111 available via -mpclmul. 4112 * Support for Intel AVX built-in functions and code generation is 4113 available via -mavx. 4114 * Automatically align the stack for local variables with alignment 4115 requirement. 4116 * GCC can now utilize the SVML library for vectorizing calls to a set 4117 of C99 functions if -mveclibabi=svml is specified and you link to 4118 an SVML ABI compatible library. 4119 * On x86-64, the ABI has been changed in the following cases to 4120 conform to the x86-64 ABI: 4121 + Passing/returning structures with flexible array member: 4122 struct foo 4123 { 4124 int i; 4125 int flex[]; 4126 }; 4127 + Passing/returning structures with complex float member: 4128 struct foo 4129 { 4130 int i; 4131 __complex__ float f; 4132 }; 4133 + Passing/returning unions with long double member: 4134 union foo 4135 { 4136 int x; 4137 long double ld; 4138 }; 4139 Code built with previous versions of GCC that uses any of these is 4140 not compatible with code built with GCC 4.4.0 or later. 4141 * A new target attribute was added to allow programmers to change the 4142 target options like -msse2 or -march=k8 for an individual function. 4143 You can also change the target options via the GCC target pragma 4144 for functions defined after the pragma. 4145 * GCC can now be configured with options --with-arch-32, 4146 --with-arch-64, --with-cpu-32, --with-cpu-64, --with-tune-32 and 4147 --with-tune-64 to control the default optimization separately for 4148 32-bit and 64-bit modes. 4149 4150 IA-32/IA64 4151 4152 * Support for __float128 (TFmode) IEEE quad type and corresponding 4153 TCmode IEEE complex quad type is available via the soft-fp library 4154 on IA-32/IA64 targets. This includes basic arithmetic operations 4155 (addition, subtraction, negation, multiplication and division) on 4156 __float128 real and TCmode complex values, the full set of IEEE 4157 comparisons between __float128 values, conversions to and from 4158 float, double and long double floating point types, as well as 4159 conversions to and from signed or unsigned integer, signed or 4160 unsigned long integer and signed or unsigned quad (TImode, IA64 4161 only) integer types. Additionally, all operations generate the full 4162 set of IEEE exceptions and support the full set of IEEE rounding 4163 modes. 4164 4165 M68K/ColdFire 4166 4167 * GCC now supports instruction scheduling for ColdFire V1, V3 and V4 4168 processors. (Scheduling support for ColdFire V2 processors was 4169 added in GCC 4.3.) 4170 * GCC now supports the -mxgot option to support programs requiring 4171 many GOT entries on ColdFire. 4172 * The m68k-*-linux-gnu target now builds multilibs by default. 4173 4174 MIPS 4175 4176 * MIPS Technologies have extended the original MIPS SVR4 ABI to 4177 include support for procedure linkage tables (PLTs) and copy 4178 relocations. These extensions allow GNU/Linux executables to use a 4179 significantly more efficient code model than the one defined by the 4180 original ABI. 4181 GCC support for this code model is available via a new command-line 4182 option, -mplt. There is also a new configure-time option, 4183 --with-mips-plt, to make -mplt the default. 4184 The new code model requires support from the assembler, the linker, 4185 and the runtime C library. This support is available in binutils 4186 2.19 and GLIBC 2.9. 4187 * GCC can now generate MIPS16 code for 32-bit GNU/Linux executables 4188 and 32-bit GNU/Linux shared libraries. This feature requires GNU 4189 binutils 2.19 or above. 4190 * Support for RMI's XLR processor is now available through the 4191 -march=xlr and -mtune=xlr options. 4192 * 64-bit targets can now perform 128-bit multiplications inline, 4193 instead of relying on a libgcc function. 4194 * Native GNU/Linux toolchains now support -march=native and 4195 -mtune=native, which select the host processor. 4196 * GCC now supports the R10K, R12K, R14K and R16K processors. The 4197 canonical -march= and -mtune= names for these processors are 4198 r10000, r12000, r14000 and r16000 respectively. 4199 * GCC can now work around the side effects of speculative execution 4200 on R10K processors. Please see the documentation of the 4201 -mr10k-cache-barrier option for details. 4202 * Support for the MIPS64 Release 2 instruction set has been added. 4203 The option -march=mips64r2 enables generation of these 4204 instructions. 4205 * GCC now supports Cavium Networks' Octeon processor. This support is 4206 available through the -march=octeon and -mtune=octeon options. 4207 * GCC now supports STMicroelectronics' Loongson 2E/2F processors. The 4208 canonical -march= and -mtune= names for these processors are 4209 loongson2e and loongson2f. 4210 4211 picochip 4212 4213 Picochip is a 16-bit processor. A typical picoChip contains over 250 4214 small cores, each with small amounts of memory. There are three 4215 processor variants (STAN, MEM and CTRL) with different instruction sets 4216 and memory configurations and they can be chosen using the -mae option. 4217 4218 This port is intended to be a "C" only port. 4219 4220 Power Architecture and PowerPC 4221 4222 * GCC now supports the e300c2, e300c3 and e500mc processors. 4223 * GCC now supports Xilinx processors with a single-precision FPU. 4224 * Decimal floating point is now supported for e500 processors. 4225 4226 S/390, zSeries and System z9/z10 4227 4228 * Support for the IBM System z10 EC/BC processor has been added. When 4229 using the -march=z10 option, the compiler will generate code making 4230 use of instructions provided by the General-Instruction-Extension 4231 Facility and the Execute-Extension Facility. 4232 4233 VxWorks 4234 4235 * GCC now supports the thread-local storage mechanism used on 4236 VxWorks. 4237 4238 Xtensa 4239 4240 * GCC now supports thread-local storage (TLS) for Xtensa processor 4241 configurations that include the Thread Pointer option. TLS also 4242 requires support from the assembler and linker; this support is 4243 provided in the GNU binutils beginning with version 2.19. 4244 4245 Documentation improvements 4246 4247 Other significant improvements 4248 4249 GCC 4.4.1 4250 4251 This is the [12]list of problem reports (PRs) from GCC's bug tracking 4252 system that are known to be fixed in the 4.4.1 release. This list might 4253 not be complete (that is, it is possible that some PRs that have been 4254 fixed are not listed here). 4255 4256 GCC 4.4.2 4257 4258 This is the [13]list of problem reports (PRs) from GCC's bug tracking 4259 system that are known to be fixed in the 4.4.2 release. This list might 4260 not be complete (that is, it is possible that some PRs that have been 4261 fixed are not listed here). 4262 4263 GCC 4.4.3 4264 4265 This is the [14]list of problem reports (PRs) from GCC's bug tracking 4266 system that are known to be fixed in the 4.4.3 release. This list might 4267 not be complete (that is, it is possible that some PRs that have been 4268 fixed are not listed here). 4269 4270 GCC 4.4.4 4271 4272 This is the [15]list of problem reports (PRs) from GCC's bug tracking 4273 system that are known to be fixed in the 4.4.4 release. This list might 4274 not be complete (that is, it is possible that some PRs that have been 4275 fixed are not listed here). 4276 4277 GCC 4.4.5 4278 4279 This is the [16]list of problem reports (PRs) from GCC's bug tracking 4280 system that are known to be fixed in the 4.4.5 release. This list might 4281 not be complete (that is, it is possible that some PRs that have been 4282 fixed are not listed here). 4283 4284 GCC 4.4.6 4285 4286 This is the [17]list of problem reports (PRs) from GCC's bug tracking 4287 system that are known to be fixed in the 4.4.6 release. This list might 4288 not be complete (that is, it is possible that some PRs that have been 4289 fixed are not listed here). 4290 4291 GCC 4.4.7 4292 4293 This is the [18]list of problem reports (PRs) from GCC's bug tracking 4294 system that are known to be fixed in the 4.4.7 release. This list might 4295 not be complete (that is, it is possible that some PRs that have been 4296 fixed are not listed here). 4297 4298 4299 For questions related to the use of GCC, please consult these web 4300 pages and the [19]GCC manuals. If that fails, the 4301 [20]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 4302 web pages and the development of GCC are welcome on our developer 4303 list at [21]gcc (a] gcc.gnu.org. All of [22]our lists have public 4304 archives. 4305 4306 Copyright (C) [23]Free Software Foundation, Inc. Verbatim copying and 4307 distribution of this entire article is permitted in any medium, 4308 provided this notice is preserved. 4309 4310 These pages are [24]maintained by the GCC team. Last modified 4311 2014-12-06[25]. 4312 4313 References 4314 4315 1. http://gcc.gnu.org/gcc-4.4/changes.html#4.4.7 4316 2. http://gcc.gnu.org/gcc-4.3/changes.html#obsoleted 4317 3. http://gcc.gnu.org/gcc-4.4/porting_to.html 4318 4. https://gcc.gnu.org/wiki/Graphite 4319 5. http://openmp.org/wp/openmp-specifications/ 4320 6. http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1040.pdf 4321 7. http://gcc.gnu.org/gcc-4.4/cxx0x_status.html 4322 8. https://gcc.gnu.org/onlinedocs/gfortran/Preprocessing-Options.html 4323 9. https://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html#index-g_t_0040code_007bWarray-temporaries_007d-125 4324 10. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfcheck-array-temporaries_007d-221 4325 11. https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html#index-g_t_0040code_007bbackslash_007d-34 4326 12. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.1 4327 13. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.2 4328 14. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.3 4329 15. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.4 4330 16. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.5 4331 17. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.6 4332 18. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.7 4333 19. https://gcc.gnu.org/onlinedocs/ 4334 20. mailto:gcc-help (a] gcc.gnu.org 4335 21. mailto:gcc (a] gcc.gnu.org 4336 22. https://gcc.gnu.org/lists.html 4337 23. http://www.fsf.org/ 4338 24. https://gcc.gnu.org/about.html 4339 25. http://validator.w3.org/check/referer 4340 ====================================================================== 4341 http://gcc.gnu.org/gcc-4.3/index.html 4342 4343 GCC 4.3 Release Series 4344 4345 Jun 27, 2011 4346 4347 The [1]GNU project and the GCC developers are pleased to announce the 4348 release of GCC 4.3.6. 4349 4350 This release is a bug-fix release, containing fixes for regressions in 4351 GCC 4.3.5 relative to previous releases of GCC. 4352 4353 Release History 4354 4355 GCC 4.3.6 4356 Jun 27, 2011 ([2]changes) 4357 4358 GCC 4.3.5 4359 May 22, 2010 ([3]changes) 4360 4361 GCC 4.3.4 4362 August 4, 2009 ([4]changes) 4363 4364 GCC 4.3.3 4365 January 24, 2009 ([5]changes) 4366 4367 GCC 4.3.2 4368 August 27, 2008 ([6]changes) 4369 4370 GCC 4.3.1 4371 June 6, 2008 ([7]changes) 4372 4373 GCC 4.3.0 4374 March 5, 2008 ([8]changes) 4375 4376 References and Acknowledgements 4377 4378 GCC used to stand for the GNU C Compiler, but since the compiler 4379 supports several other languages aside from C, it now stands for the 4380 GNU Compiler Collection. 4381 4382 A list of [9]successful builds is updated as new information becomes 4383 available. 4384 4385 The GCC developers would like to thank the numerous people that have 4386 contributed new features, improvements, bug fixes, and other changes as 4387 well as test results to GCC. This [10]amazing group of volunteers is 4388 what makes GCC successful. 4389 4390 For additional information about GCC please refer to the [11]GCC 4391 project web site or contact the [12]GCC development mailing list. 4392 4393 To obtain GCC please use [13]our mirror sites or [14]our SVN server. 4394 4395 4396 For questions related to the use of GCC, please consult these web 4397 pages and the [15]GCC manuals. If that fails, the 4398 [16]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 4399 web pages and the development of GCC are welcome on our developer 4400 list at [17]gcc (a] gcc.gnu.org. All of [18]our lists have public 4401 archives. 4402 4403 Copyright (C) [19]Free Software Foundation, Inc. Verbatim copying and 4404 distribution of this entire article is permitted in any medium, 4405 provided this notice is preserved. 4406 4407 These pages are [20]maintained by the GCC team. Last modified 4408 2014-06-28[21]. 4409 4410 References 4411 4412 1. http://www.gnu.org/ 4413 2. http://gcc.gnu.org/gcc-4.3/changes.html 4414 3. http://gcc.gnu.org/gcc-4.3/changes.html 4415 4. http://gcc.gnu.org/gcc-4.3/changes.html 4416 5. http://gcc.gnu.org/gcc-4.3/changes.html 4417 6. http://gcc.gnu.org/gcc-4.3/changes.html 4418 7. http://gcc.gnu.org/gcc-4.3/changes.html 4419 8. http://gcc.gnu.org/gcc-4.3/changes.html 4420 9. http://gcc.gnu.org/gcc-4.3/buildstat.html 4421 10. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 4422 11. http://gcc.gnu.org/index.html 4423 12. mailto:gcc (a] gcc.gnu.org 4424 13. http://gcc.gnu.org/mirrors.html 4425 14. http://gcc.gnu.org/svn.html 4426 15. https://gcc.gnu.org/onlinedocs/ 4427 16. mailto:gcc-help (a] gcc.gnu.org 4428 17. mailto:gcc (a] gcc.gnu.org 4429 18. https://gcc.gnu.org/lists.html 4430 19. http://www.fsf.org/ 4431 20. https://gcc.gnu.org/about.html 4432 21. http://validator.w3.org/check/referer 4433 ====================================================================== 4434 http://gcc.gnu.org/gcc-4.3/changes.html 4435 4436 GCC 4.3 Release Series 4437 Changes, New Features, and Fixes 4438 4439 The latest release in the 4.3 release series is [1]GCC 4.3.5. 4440 4441 Caveats 4442 4443 * GCC requires the [2]GMP and [3]MPFR libraries for building all the 4444 various front-end languages it supports. See the [4]prerequisites 4445 page for version requirements. 4446 * ColdFire targets now treat long double as having the same format as 4447 double. In earlier versions of GCC, they used the 68881 long double 4448 format instead. 4449 * The m68k-uclinux target now uses the same calling conventions as 4450 m68k-linux-gnu. You can select the original calling conventions by 4451 configuring for m68k-uclinuxoldabi instead. Note that 4452 m68k-uclinuxoldabi also retains the original 80-bit long double on 4453 ColdFire targets. 4454 * The -fforce-mem option has been removed because it has had no 4455 effect in the last few GCC releases. 4456 * The i386 -msvr3-shlib option has been removed since it is no longer 4457 used. 4458 * Fastcall for i386 has been changed not to pass aggregate arguments 4459 in registers, following Microsoft compilers. 4460 * Support for the AOF assembler has been removed from the ARM back 4461 end; this affects only the targets arm-semi-aof and armel-semi-aof, 4462 which are no longer recognized. We removed these targets without a 4463 deprecation period because we discovered that they have been 4464 unusable since GCC 4.0.0. 4465 * Support for the TMS320C3x/C4x processor (targets c4x-* and tic4x-*) 4466 has been removed. This support had been deprecated since GCC 4.0.0. 4467 * Support for a number of older systems and recently unmaintained or 4468 untested target ports of GCC has been declared obsolete in GCC 4.3. 4469 Unless there is activity to revive them, the next release of GCC 4470 will have their sources permanently removed. 4471 All GCC ports for the following processor architectures have been 4472 declared obsolete: 4473 + Morpho MT (mt-*) 4474 The following aliases for processor architectures have been 4475 declared obsolete. Users should use the indicated generic target 4476 names instead, with compile-time options such as -mcpu or 4477 configure-time options such as --with-cpu to control the 4478 configuration more precisely. 4479 + strongarm*-*-*, ep9312*-*-*, xscale*-*-* (use arm*-*-* 4480 instead). 4481 + parisc*-*-* (use hppa*-*-* instead). 4482 + m680[012]0-*-* (use m68k-*-* instead). 4483 All GCC ports for the following operating systems have been 4484 declared obsolete: 4485 + BeOS (*-*-beos*) 4486 + kaOS (*-*-kaos*) 4487 + GNU/Linux using the a.out object format (*-*-linux*aout*) 4488 + GNU/Linux using version 1 of the GNU C Library 4489 (*-*-linux*libc1*) 4490 + Solaris versions before Solaris 7 (*-*-solaris2.[0-6], 4491 *-*-solaris2.[0-6].*) 4492 + Miscellaneous System V (*-*-sysv*) 4493 + WindISS (*-*-windiss*) 4494 Also, those for some individual systems on particular architectures 4495 have been obsoleted: 4496 + UNICOS/mk on DEC Alpha (alpha*-*-unicosmk*) 4497 + CRIS with a.out object format (cris-*-aout) 4498 + BSD 4.3 on PA-RISC (hppa1.1-*-bsd*) 4499 + OSF/1 on PA-RISC (hppa1.1-*-osf*) 4500 + PRO on PA-RISC (hppa1.1-*-pro*) 4501 + Sequent PTX on IA32 (i[34567]86-sequent-ptx4*, 4502 i[34567]86-sequent-sysv4*) 4503 + SCO Open Server 5 on IA32 (i[34567]86-*-sco3.2v5*) 4504 + UWIN on IA32 (i[34567]86-*-uwin*) (support for UWIN as a host 4505 was previously [5]removed in 2001, leaving only the support 4506 for UWIN as a target now being deprecated) 4507 + ChorusOS on PowerPC (powerpc-*-chorusos*) 4508 + All VAX configurations apart from NetBSD and OpenBSD 4509 (vax-*-bsd*, vax-*-sysv*, vax-*-ultrix*) 4510 * The [6]-Wconversion option has been modified. Its purpose now is to 4511 warn for implicit conversions that may alter a value. This new 4512 behavior is available for both C and C++. Warnings about 4513 conversions between signed and unsigned integers can be disabled by 4514 using -Wno-sign-conversion. In C++, they are disabled by default 4515 unless -Wsign-conversion is explicitly requested. The old behavior 4516 of -Wconversion, that is, warn for prototypes causing a type 4517 conversion that is different from what would happen to the same 4518 argument in the absence of a prototype, has been moved to a new 4519 option -Wtraditional-conversion, which is only available for C. 4520 * The -m386, -m486, -mpentium and -mpentiumpro tuning options have 4521 been removed because they were deprecated for more than 3 GCC major 4522 releases. Use -mtune=i386, -mtune=i486, -mtune=pentium or 4523 -mtune=pentiumpro as a replacement. 4524 * The -funsafe-math-optimizations option now automatically turns on 4525 -fno-trapping-math in addition to -fno-signed-zeros, as it enables 4526 reassociation and thus may introduce or remove traps. 4527 * The -ftree-vectorize option is now on by default under -O3. In 4528 order to generate code for a SIMD extension, it has to be enabled 4529 as well: use -maltivec for PowerPC platforms and -msse/-msse2 for 4530 i?86 and x86_64. 4531 * More information on porting to GCC 4.3 from previous versions of 4532 GCC can be found in the [7]porting guide for this release. 4533 4534 General Optimizer Improvements 4535 4536 * The GCC middle-end has been integrated with the [8]MPFR library. 4537 This allows GCC to evaluate and replace at compile-time calls to 4538 built-in math functions having constant arguments with their 4539 mathematically equivalent results. In making use of [9]MPFR, GCC 4540 can generate correct results regardless of the math library 4541 implementation or floating point precision of the host platform. 4542 This also allows GCC to generate identical results regardless of 4543 whether one compiles in native or cross-compile configurations to a 4544 particular target. The following built-in functions take advantage 4545 of this new capability: acos, acosh, asin, asinh, atan2, atan, 4546 atanh, cbrt, cos, cosh, drem, erf, erfc, exp10, exp2, exp, expm1, 4547 fdim, fma, fmax, fmin, gamma_r, hypot, j0, j1, jn, lgamma_r, log10, 4548 log1p, log2, log, pow10, pow, remainder, remquo, sin, sincos, sinh, 4549 tan, tanh, tgamma, y0, y1 and yn. The float and long double 4550 variants of these functions (e.g. sinf and sinl) are also handled. 4551 The sqrt and cabs functions with constant arguments were already 4552 optimized in prior GCC releases. Now they also use [10]MPFR. 4553 * A new forward propagation pass on RTL was added. The new pass 4554 replaces several slower transformations, resulting in compile-time 4555 improvements as well as better code generation in some cases. 4556 * A new command-line switch -frecord-gcc-switches has been added to 4557 GCC, although it is only enabled for some targets. The switch 4558 causes the command line that was used to invoke the compiler to be 4559 recorded into the object file that is being created. The exact 4560 format of this recording is target and binary file format 4561 dependent, but it usually takes the form of a note section 4562 containing ASCII text. The switch is related to the -fverbose-asm 4563 switch, but that one only records the information in the assembler 4564 output file as comments, so the information never reaches the 4565 object file. 4566 * The inliner heuristic is now aware of stack frame consumption. New 4567 command-line parameters --param large-stack-frame and --param 4568 large-stack-frame-growth can be used to limit stack frame size 4569 growth caused by inlining. 4570 * During feedback directed optimizations, the expected block size the 4571 memcpy, memset and bzero functions operate on is discovered and for 4572 cases of commonly used small sizes, specialized inline code is 4573 generated. 4574 * __builtin_expect no longer requires its argument to be a compile 4575 time constant. 4576 * Interprocedural optimization was reorganized to work on functions 4577 in SSA form. This enables more precise and cheaper dataflow 4578 analysis and makes writing interprocedural optimizations easier. 4579 The following improvements have been implemented on top of this 4580 framework: 4581 + Pre-inline optimization: Selected local optimization passes 4582 are run before the inliner (and other interprocedural passes) 4583 are executed. This significantly improves the accuracy of code 4584 growth estimates used by the inliner and reduces the overall 4585 memory footprint for large compilation units. 4586 + Early inlining (a simple bottom-up inliner pass inlining only 4587 functions whose body is smaller than the expected call 4588 overhead) is now executed with the early optimization passes, 4589 thus inlining already optimized function bodies into an 4590 unoptimized function that is subsequently optimized by early 4591 optimizers. This enables the compiler to quickly eliminate 4592 abstraction penalty in C++ programs. 4593 + Interprocedural constant propagation now operate on SSA form 4594 increasing accuracy of the analysis. 4595 * A new internal representation for GIMPLE statements has been 4596 contributed, resulting in compile-time memory savings. 4597 * The vectorizer was enhanced to support vectorization of outer 4598 loops, intra-iteration parallelism (loop-aware SLP), vectorization 4599 of strided accesses and loops with multiple data-types. Run-time 4600 dependency testing using loop versioning was added. The cost model, 4601 turned on by -fvect-cost-model, was developed. 4602 4603 New Languages and Language specific improvements 4604 4605 * We have added new command-line options 4606 -finstrument-functions-exclude-function-list and 4607 -finstrument-functions-exclude-file-list. They provide more control 4608 over which functions are annotated by the -finstrument-functions 4609 option. 4610 4611 C family 4612 4613 * Implicit conversions between generic vector types are now only 4614 permitted when the two vectors in question have the same number of 4615 elements and compatible element types. (Note that the restriction 4616 involves compatible element types, not implicitly-convertible 4617 element types: thus, a vector type with element type int may not be 4618 implicitly converted to a vector type with element type unsigned 4619 int.) This restriction, which is in line with specifications for 4620 SIMD architectures such as AltiVec, may be relaxed using the flag 4621 -flax-vector-conversions. This flag is intended only as a 4622 compatibility measure and should not be used for new code. 4623 * -Warray-bounds has been added and is now enabled by default for 4624 -Wall . It produces warnings for array subscripts that can be 4625 determined at compile time to be always out of bounds. 4626 -Wno-array-bounds will disable the warning. 4627 * The constructor and destructor function attributes now accept 4628 optional priority arguments which control the order in which the 4629 constructor and destructor functions are run. 4630 * New [11]command-line options -Wtype-limits, 4631 -Wold-style-declaration, -Wmissing-parameter-type, -Wempty-body, 4632 -Wclobbered and -Wignored-qualifiers have been added for finer 4633 control of the diverse warnings enabled by -Wextra. 4634 * A new function attribute alloc_size has been added to mark up 4635 malloc style functions. For constant sized allocations this can be 4636 used to find out the size of the returned pointer using the 4637 __builtin_object_size() function for buffer overflow checking and 4638 similar. This supplements the already built-in malloc and calloc 4639 constant size handling. 4640 * Integer constants written in binary are now supported as a GCC 4641 extension. They consist of a prefix 0b or 0B, followed by a 4642 sequence of 0 and 1 digits. 4643 * A new predefined macro __COUNTER__ has been added. It expands to 4644 sequential integral values starting from 0. In conjunction with the 4645 ## operator, this provides a convenient means to generate unique 4646 identifiers. 4647 * A new command-line option -fdirectives-only has been added. It 4648 enables a special preprocessing mode which improves the performance 4649 of applications like distcc and ccache. 4650 * Fixed-point data types and operators have been added. They are 4651 based on Chapter 4 of the Embedded-C specification (n1169.pdf). 4652 Currently, only MIPS targets are supported. 4653 * Decimal floating-point arithmetic based on draft ISO/IEC TR 24732, 4654 N1241, is now supported as a GCC extension to C for targets 4655 i[34567]86-*-linux-gnu, powerpc*-*-linux-gnu, s390*-ibm-linux-gnu, 4656 and x86_64-*-linux-gnu. The feature introduces new data types 4657 _Decimal32, _Decimal64, and _Decimal128 with constant suffixes DF, 4658 DD, and DL. 4659 4660 C++ 4661 4662 * [12]Experimental support for the upcoming ISO C++ standard, C++0x. 4663 * -Wc++0x-compat has been added and is now enabled by default for 4664 -Wall. It produces warnings for constructs whose meaning differs 4665 between ISO C++ 1998 and C++0x. 4666 * The -Wparentheses option now works for C++ as it does for C. It 4667 warns if parentheses are omitted when operators with confusing 4668 precedence are nested. It also warns about ambiguous else 4669 statements. Since -Wparentheses is enabled by -Wall, this may cause 4670 additional warnings with existing C++ code which uses -Wall. These 4671 new warnings may be disabled by using -Wall -Wno-parentheses. 4672 * The -Wmissing-declarations now works for C++ as it does for C. 4673 * The -fvisibility-ms-compat flag was added, to make it easier to 4674 port larger projects using shared libraries from Microsoft's Visual 4675 Studio to ELF and Mach-O systems. 4676 * C++ attribute handling has been overhauled for template arguments 4677 (ie dependent types). In particular, __attribute__((aligned(T))); 4678 works for C++ types. 4679 4680 Runtime Library (libstdc++) 4681 4682 * [13]Experimental support for the upcoming ISO C++ standard, C++0x. 4683 * Support for TR1 mathematical special functions and regular 4684 expressions. ([14]Implementation status of TR1) 4685 * Default what implementations give more elaborate exception strings 4686 for bad_cast, bad_typeid, bad_exception, and bad_alloc. 4687 * Header dependencies have been streamlined, reducing unnecessary 4688 includes and pre-processed bloat. 4689 * Variadic template implementations of items in <tuple> and 4690 <functional>. 4691 * An experimental [15]parallel mode has been added. This is a 4692 parallel implementation of many C++ Standard library algorithms, 4693 like std::accumulate, std::for_each, std::transform, or std::sort, 4694 to give but four examples. These algorithms can be substituted for 4695 the normal (sequential) libstdc++ algorithms on a piecemeal basis, 4696 or all existing algorithms can be transformed via the 4697 -D_GLIBCXX_PARALLEL macro. 4698 * Debug mode versions of classes in <unordered_set> and 4699 <unordered_map>. 4700 * Formal deprecation of <ext/hash_set> and <ext/hash_map>, which are 4701 now <backward/hash_set> and <backward/hash_map>. This code: 4702 #include <ext/hash_set> 4703 __gnu_cxx::hash_set<int> s; 4704 4705 Can be transformed (in order of preference) to: 4706 #include <tr1/unordered_set> 4707 std::tr1::unordered_set<int> s; 4708 4709 or 4710 #include <backward/hash_set> 4711 __gnu_cxx::hash_set<int> s; 4712 4713 Similar transformations apply to __gnu_cxx::hash_map, 4714 __gnu_cxx::hash_multimap, __gnu_cxx::hash_set, 4715 __gnu_cxx::hash_multiset. 4716 4717 Fortran 4718 4719 * Due to the fact that the [16]GMP and [17]MPFR libraries are 4720 required for all languages, Fortran is no longer special in this 4721 regard and is available by default. 4722 * The [18]-fexternal-blas option has been added, which generates 4723 calls to BLAS routines for intrinsic matrix operations such as 4724 matmul rather than using the built-in algorithms. 4725 * Support to give a backtrace (compiler flag -fbacktrace or 4726 environment variable GFORTRAN_ERROR_BACKTRACE; on glibc systems 4727 only) or a core dump (-fdump-core, GFORTRAN_ERROR_DUMPCORE) when a 4728 run-time error occured. 4729 * GNU Fortran now defines __GFORTRAN__ when it runs the C 4730 preprocessor (CPP). 4731 * The [19]-finit-local-zero, -finit-real, -finit-integer, 4732 -finit-character, and -finit-logical options have been added, which 4733 can be used to initialize local variables. 4734 * The intrinsic procedures [20]GAMMA and [21]LGAMMA have been added, 4735 which calculate the Gamma function and its logarithm. Use EXTERNAL 4736 gamma if you want to use your own gamma function. 4737 * GNU Fortran now regards the backslash character as literal (as 4738 required by the Fortran 2003 standard); using [22]-fbackslash GNU 4739 Fortran interprets backslashes as C-style escape characters. 4740 * The [23]interpretation of binary, octal and hexadecimal (BOZ) 4741 literal constants has been changed. Before they were always 4742 interpreted as integer; now they are bit-wise transferred as 4743 argument of INT, REAL, DBLE and CMPLX as required by the Fortran 4744 2003 standard, and for real and complex variables in DATA 4745 statements or when directly assigned to real and complex variables. 4746 Everywhere else and especially in expressions they are still 4747 regarded as integer constants. 4748 * Fortran 2003 support has been extended: 4749 + Intrinsic statements IMPORT, PROTECTED, VALUE and VOLATILE 4750 + Pointer intent 4751 + Intrinsic module ISO_ENV_FORTRAN 4752 + Interoperability with C (ISO C Bindings) 4753 + ABSTRACT INTERFACES and PROCEDURE statements (without POINTER 4754 attribute) 4755 + Fortran 2003 BOZ 4756 4757 Java (GCJ) 4758 4759 * GCJ now uses the Eclipse Java compiler for its Java parsing needs. 4760 This enables the use of all 1.5 language features, and fixes most 4761 existing front end bugs. 4762 * libgcj now supports all 1.5 language features which require runtime 4763 support: foreach, enum, annotations, generics, and auto-boxing. 4764 * We've made many changes to the tools shipped with gcj. 4765 + The old jv-scan tool has been removed. This tool never really 4766 worked properly. There is no replacement. 4767 + gcjh has been rewritten. Some of its more obscure options no 4768 longer work, but are still recognized in an attempt at 4769 compatibility. gjavah is a new program with similar 4770 functionality but different command-line options. 4771 + grmic and grmiregistry have been rewritten. grmid has been 4772 added. 4773 + gjar replaces the old fastjar. 4774 + gjarsigner (used for signing jars), gkeytool (used for key 4775 management), gorbd (for CORBA), gserialver (computes 4776 serialization UIDs), and gtnameserv (also for CORBA) are now 4777 installed. 4778 * The ability to dump the contents of the java run time heap to a 4779 file for off-line analysis has been added. The heap dumps may be 4780 analyzed with the new gc-analyze tool. They may be generated on 4781 out-of-memory conditions or on demand and are controlled by the new 4782 run time class gnu.gcj.util.GCInfo. 4783 * java.util.TimeZone can now read files from /usr/share/zoneinfo to 4784 provide correct, updated, timezone information. This means that 4785 packagers no longer have to update libgcj when a time zone change 4786 is published. 4787 4788 New Targets and Target Specific Improvements 4789 4790 IA-32/x86-64 4791 4792 * Tuning for Intel Core 2 processors is available via -mtune=core2 4793 and -march=core2. 4794 * Tuning for AMD Geode processors is available via -mtune=geode and 4795 -march=geode. 4796 * Code generation of block move (memcpy) and block set (memset) was 4797 rewritten. GCC can now pick the best algorithm (loop, unrolled 4798 loop, instruction with rep prefix or a library call) based on the 4799 size of the block being copied and the CPU being optimized for. A 4800 new option -minline-stringops-dynamically has been added. With this 4801 option string operations of unknown size are expanded such that 4802 small blocks are copied by in-line code, while for large blocks a 4803 library call is used. This results in faster code than 4804 -minline-all-stringops when the library implementation is capable 4805 of using cache hierarchy hints. The heuristic choosing the 4806 particular algorithm can be overwritten via -mstringop-strategy. 4807 Newly also memset of values different from 0 is inlined. 4808 * GCC no longer places the cld instruction before string operations. 4809 Both i386 and x86-64 ABI documents mandate the direction flag to be 4810 clear at the entry of a function. It is now invalid to set the flag 4811 in asm statement without reseting it afterward. 4812 * Support for SSSE3 built-in functions and code generation are 4813 available via -mssse3. 4814 * Support for SSE4.1 built-in functions and code generation are 4815 available via -msse4.1. 4816 * Support for SSE4.2 built-in functions and code generation are 4817 available via -msse4.2. 4818 * Both SSE4.1 and SSE4.2 support can be enabled via -msse4. 4819 * A new set of options -mpc32, -mpc64 and -mpc80 have been added to 4820 allow explicit control of x87 floating point precision. 4821 * Support for __float128 (TFmode) IEEE quad type and corresponding 4822 TCmode IEEE complex quad type is available via the soft-fp library 4823 on x86_64 targets. This includes basic arithmetic operations 4824 (addition, subtraction, negation, multiplication and division) on 4825 __float128 real and TCmode complex values, the full set of IEEE 4826 comparisons between __float128 values, conversions to and from 4827 float, double and long double floating point types, as well as 4828 conversions to and from signed or unsigned integer, signed or 4829 unsigned long integer and signed or unsigned quad (TImode) integer 4830 types. Additionally, all operations generate the full set of IEEE 4831 exceptions and support the full set of IEEE rounding modes. 4832 * GCC can now utilize the ACML library for vectorizing calls to a set 4833 of C99 functions on x86_64 if -mveclibabi=acml is specified and you 4834 link to an ACML ABI compatible library. 4835 4836 ARM 4837 4838 * Compiler and Library support for Thumb-2 and the ARMv7 architecture 4839 has been added. 4840 4841 CRIS 4842 4843 New features 4844 4845 * Compiler and Library support for the CRIS v32 architecture, as 4846 found in Axis Communications ETRAX FS and ARTPEC-3 chips, has been 4847 added. 4848 4849 Configuration changes 4850 4851 * The cris-*-elf target now includes support for CRIS v32, including 4852 libraries, through the -march=v32 option. 4853 * A new crisv32-*-elf target defaults to generate code for CRIS v32. 4854 * A new crisv32-*-linux* target defaults to generate code for CRIS 4855 v32. 4856 * The cris-*-aout target has been obsoleted. 4857 4858 Improved support for built-in functions 4859 4860 * GCC can now use the lz and swapwbr instructions to implement the 4861 __builtin_clz, __builtin_ctz and __builtin_ffs family of functions. 4862 * __builtin_bswap32 is now implemented using the swapwb instruction, 4863 when available. 4864 4865 m68k and ColdFire 4866 4867 New features 4868 4869 * Support for several new ColdFire processors has been added. You can 4870 generate code for them using the new -mcpu option. 4871 * All targets now support ColdFire processors. 4872 * m68k-uclinux targets have improved support for C++ constructors and 4873 destructors, and for shared libraries. 4874 * It is now possible to set breakpoints on the first or last line of 4875 a function, even if there are no statements on that line. 4876 4877 Optimizations 4878 4879 * Support for sibling calls has been added. 4880 * More use is now made of the ColdFire mov3q instruction. 4881 * __builtin_clz is now implemented using the ff1 ColdFire 4882 instruction, when available. 4883 * GCC now honors the -m68010 option. 68010 code now uses clr rather 4884 than move to zero volatile memory. 4885 * 68020 targets and above can now use symbol(index.size*scale) 4886 addresses for indexed array accesses. Earlier compilers would 4887 always load the symbol into a base register first. 4888 4889 Configuration changes 4890 4891 * All m68k and ColdFire targets now allow the default processor to be 4892 set at configure time using --with-cpu. 4893 * A --with-arch configuration option has been added. This option 4894 allows you to restrict a target to ColdFire or non-ColdFire 4895 processors. 4896 4897 Preprocessor macros 4898 4899 * An __mcfv*__ macro is now defined for all ColdFire targets. 4900 (Earlier versions of GCC only defined __mcfv4e__.) 4901 * __mcf_cpu_*, __mcf_family_* and __mcffpu__ macros have been added. 4902 * All targets now define __mc68010 and __mc68010__ when generating 4903 68010 code. 4904 4905 Command-line changes 4906 4907 * New command-line options -march, -mcpu, -mtune and -mhard-float 4908 have been added. These options apply to both m68k and ColdFire 4909 targets. 4910 * -mno-short, -mno-bitfield and -mno-rtd are now accepted as negative 4911 versions of -mshort, etc. 4912 * -fforce-addr has been removed. It is now ignored by the compiler. 4913 4914 Other improvements 4915 4916 * ColdFire targets now try to maintain a 4-byte-aligned stack where 4917 possible. 4918 * m68k-uclinux targets now try to avoid situations that lead to the 4919 load-time error: BINFMT_FLAT: reloc outside program. 4920 4921 MIPS 4922 4923 Changes to existing configurations 4924 4925 * libffi and libjava now support all three GNU/Linux ABIs: o32, n32 4926 and n64. Every GNU/Linux configuration now builds these libraries 4927 by default. 4928 * GNU/Linux configurations now generate -mno-shared code unless 4929 overridden by -fpic, -fPIC, -fpie or -fPIE. 4930 * mipsisa32*-linux-gnu configurations now generate hard-float code by 4931 default, just like other mipsisa32* and mips*-linux-gnu 4932 configurations. You can build a soft-float version of any 4933 mips*-linux-gnu configuration by passing --with-float=soft to 4934 configure. 4935 * mips-wrs-vxworks now supports run-time processes (RTPs). 4936 4937 Changes to existing command-line options 4938 4939 * The -march and -mtune options no longer accept 24k as a processor 4940 name. Please use 24kc, 24kf2_1 or 24kf1_1 instead. 4941 * The -march and -mtune options now accept 24kf2_1, 24kef2_1 and 4942 34kf2_1 as synonyms for 24kf, 24kef and 34kf respectively. The 4943 options also accept 24kf1_1, 24kef1_1 and 34kf1_1 as synonyms for 4944 24kx, 24kex and 34kx. 4945 4946 New configurations 4947 4948 GCC now supports the following configurations: 4949 * mipsisa32r2*-linux-gnu*, which generates MIPS32 revision 2 code by 4950 default. Earlier releases also recognized this configuration, but 4951 they treated it in the same way as mipsisa32*-linux-gnu*. Note that 4952 you can customize any mips*-linux-gnu* configuration to a 4953 particular ISA or processor by passing an appropriate --with-arch 4954 option to configure. 4955 * mipsisa*-sde-elf*, which provides compatibility with MIPS 4956 Technologies' SDE toolchains. The configuration uses the SDE 4957 libraries by default, but you can use it like other newlib-based 4958 ELF configurations by passing --with-newlib to configure. It is the 4959 only configuration besides mips64vr*-elf* to build MIPS16 as well 4960 as non-MIPS16 libraries. 4961 * mipsisa*-elfoabi*, which is similar to the general mipsisa*-elf* 4962 configuration, but uses the o32 and o64 ABIs instead of the 32-bit 4963 and 64-bit forms of the EABI. 4964 4965 New processors and application-specific extensions 4966 4967 * Support for the SmartMIPS ASE is available through the new 4968 -msmartmips option. 4969 * Support for revision 2 of the DSP ASE is available through the new 4970 -mdspr2 option. A new preprocessor macro called __mips_dsp_rev 4971 indicates the revision of the ASE in use. 4972 * Support for the 4KS and 74K families of processors is available 4973 through the -march and -mtune options. 4974 4975 Improved support for built-in functions 4976 4977 * GCC can now use load-linked, store-conditional and sync 4978 instructions to implement atomic built-in functions such as 4979 __sync_fetch_and_add. The memory reference must be 4 bytes wide for 4980 32-bit targets and either 4 or 8 bytes wide for 64-bit targets. 4981 * GCC can now use the clz and dclz instructions to implement the 4982 __builtin_ctz and __builtin_ffs families of functions. 4983 * There is a new __builtin___clear_cache function for flushing the 4984 instruction cache. GCC expands this function inline on MIPS32 4985 revision 2 targets, otherwise it calls the function specified by 4986 -mcache-flush-func. 4987 4988 MIPS16 improvements 4989 4990 * GCC can now compile objects that contain a mixture of MIPS16 and 4991 non-MIPS16 code. There are two new attributes, mips16 and nomips16, 4992 for specifying which mode a function should use. 4993 * A new option called -minterlink-mips16 makes non-MIPS16 code 4994 link-compatible with MIPS16 code. 4995 * After many bug fixes, the long-standing MIPS16 -mhard-float support 4996 should now work fairly reliably. 4997 * GCC can now use the MIPS16e save and restore instructions. 4998 * -fsection-anchors now works in MIPS16 mode. MIPS16 code compiled 4999 with -G0 -fsection-anchors is often smaller than code compiled with 5000 -G8. However, please note that you must usually compile all objects 5001 in your application with the same -G option; see the documentation 5002 of -G for details. 5003 * A new option called-mcode-readable specifies which instructions are 5004 allowed to load from the code segment. -mcode-readable=yes is the 5005 default and says that any instruction may load from the code 5006 segment. The other alternatives are -mcode-readable=pcrel, which 5007 says that only PC-relative MIPS16 instructions may load from the 5008 code segment, and -mcode-readable=no, which says that no 5009 instruction may do so. Please see the documentation for more 5010 details, including example uses. 5011 5012 Small-data improvements 5013 5014 There are three new options for controlling small data: 5015 * -mno-extern-sdata, which disables small-data accesses for 5016 externally-defined variables. Code compiled with -Gn 5017 -mno-extern-sdata will be link-compatible with any -G setting 5018 between -G0 and -Gn inclusive. 5019 * -mno-local-sdata, which disables the use of small-data sections for 5020 data that is not externally visible. This option can be a useful 5021 way of reducing small-data usage in less performance-critical parts 5022 of an application. 5023 * -mno-gpopt, which disables the use of the $gp register while still 5024 honoring the -G limit when placing externally-visible data. This 5025 option implies -mno-extern-sdata and -mno-local-sdata and it can be 5026 useful in situations where $gp does not necessarily hold the 5027 expected value. 5028 5029 Miscellaneous improvements 5030 5031 * There is a new option called -mbranch-cost for tweaking the 5032 perceived cost of branches. 5033 * If GCC is configured to use a version of GAS that supports the 5034 .gnu_attribute directive, it will use that directive to record 5035 certain properties of the output code. .gnu_attribute is new to GAS 5036 2.18. 5037 * There are two new function attributes, near and far, for overriding 5038 the command-line setting of -mlong-calls on a function-by-function 5039 basis. 5040 * -mfp64, which previously required a 64-bit target, now works with 5041 MIPS32 revision 2 targets as well. The mipsisa*-elfoabi* and 5042 mipsisa*-sde-elf* configurations provide suitable library support. 5043 * GCC now recognizes the -mdmx and -mmt options and passes them down 5044 to the assembler. It does nothing else with the options at present. 5045 5046 SPU (Synergistic Processor Unit) of the Cell Broadband Engine Architecture 5047 (BEA) 5048 5049 * Support has been added for this new architecture. 5050 5051 RS6000 (POWER/PowerPC) 5052 5053 * Support for the PowerPC 750CL paired-single instructions has been 5054 added with a new powerpc-*-linux*paired* target configuration. It 5055 is enabled by an associated -mpaired option and can be accessed 5056 using new built-in functions. 5057 * Support for auto-detecting architecture and system configuration to 5058 auto-select processor optimization tuning. 5059 * Support for VMX on AIX 5.3 has been added. 5060 * Support for AIX Version 6.1 has been added. 5061 5062 S/390, zSeries and System z9 5063 5064 * Support for the IBM System z9 EC/BC processor (z9 GA3) has been 5065 added. When using the -march=z9-ec option, the compiler will 5066 generate code making use of instructions provided by the decimal 5067 floating point facility and the floating point conversion facility 5068 (pfpo). Besides the instructions used to implement decimal floating 5069 point operations these facilities also contain instructions to move 5070 between general purpose and floating point registers and to modify 5071 and copy the sign-bit of floating point values. 5072 * When the -march=z9-ec option is used the new 5073 -mhard-dfp/-mno-hard-dfp options can be used to specify whether the 5074 decimal floating point hardware instructions will be used or not. 5075 If none of them is given the hardware support is enabled by 5076 default. 5077 * The -mstack-guard option can now be omitted when using stack 5078 checking via -mstack-size in order to let GCC choose a sensible 5079 stack guard value according to the frame size of each function. 5080 * Various changes to improve performance of generated code have been 5081 implemented, including: 5082 + The condition code set by an add logical with carry 5083 instruction is now available for overflow checks like: a + b + 5084 carry < b. 5085 + The test data class instruction is now used to implement 5086 sign-bit and infinity checks of binary and decimal floating 5087 point numbers. 5088 5089 SPARC 5090 5091 * Support for the Sun UltraSPARC T2 (Niagara 2) processor has been 5092 added. 5093 5094 Xtensa 5095 5096 * Stack unwinding for exception handling now uses by default a 5097 specialized version of DWARF unwinding. This is not 5098 binary-compatible with the setjmp/longjmp (sjlj) unwinding used for 5099 Xtensa with previous versions of GCC. 5100 * For Xtensa processors that include the Conditional Store option, 5101 the built-in functions for atomic memory access are now implemented 5102 using S32C1I instructions. 5103 * If the Xtensa NSA option is available, GCC will use it to implement 5104 the __builtin_ctz and __builtin_clz functions. 5105 5106 Documentation improvements 5107 5108 * Existing libstdc++ documentation has been edited and restructured 5109 into a single DocBook XML manual. The results can be viewed online 5110 [24]here. 5111 5112 Other significant improvements 5113 5114 * The compiler's --help command-line option has been extended so that 5115 it now takes an optional set of arguments. These arguments restrict 5116 the information displayed to specific classes of command-line 5117 options, and possibly only a subset of those options. It is also 5118 now possible to replace the descriptive text associated with each 5119 displayed option with an indication of its current value, or for 5120 binary options, whether it has been enabled or disabled. 5121 Here are some examples. The following will display all the options 5122 controlling warning messages: 5123 --help=warnings 5124 5125 Whereas this will display all the undocumented, target specific 5126 options: 5127 --help=target,undocumented 5128 5129 This sequence of commands will display the binary optimizations 5130 that are enabled by -O3: 5131 gcc -c -Q -O3 --help=optimizers > /tmp/O3-opts 5132 gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts 5133 diff /tmp/O2-opts /tmp/O3-opts | grep enabled 5134 5135 * The configure options --with-pkgversion and --with-bugurl have been 5136 added. These allow distributors of GCC to include a 5137 distributor-specific string in manuals and --version output and to 5138 specify the URL for reporting bugs in their versions of GCC. 5139 5140 GCC 4.3.1 5141 5142 This is the [25]list of problem reports (PRs) from GCC's bug tracking 5143 system that are known to be fixed in the 4.3.1 release. This list might 5144 not be complete (that is, it is possible that some PRs that have been 5145 fixed are not listed here). 5146 5147 Target Specific Changes 5148 5149 IA-32/x86-64 5150 5151 ABI changes 5152 5153 * Starting with GCC 4.3.1, decimal floating point variables are 5154 aligned to their natural boundaries when they are passed on the 5155 stack for i386. 5156 5157 Command-line changes 5158 5159 * Starting with GCC 4.3.1, the -mcld option has been added to 5160 automatically generate a cld instruction in the prologue of 5161 functions that use string instructions. This option is used for 5162 backward compatibility on some operating systems and can be enabled 5163 by default for 32-bit x86 targets by configuring GCC with the 5164 --enable-cld configure option. 5165 5166 GCC 4.3.2 5167 5168 This is the [26]list of problem reports (PRs) from GCC's bug tracking 5169 system that are known to be fixed in the 4.3.2 release. This list might 5170 not be complete (that is, it is possible that some PRs that have been 5171 fixed are not listed here). 5172 5173 GCC 4.3.3 5174 5175 This is the [27]list of problem reports (PRs) from GCC's bug tracking 5176 system that are known to be fixed in the 4.3.3 release. This list might 5177 not be complete (that is, it is possible that some PRs that have been 5178 fixed are not listed here). 5179 5180 GCC 4.3.4 5181 5182 This is the [28]list of problem reports (PRs) from GCC's bug tracking 5183 system that are known to be fixed in the 4.3.4 release. This list might 5184 not be complete (that is, it is possible that some PRs that have been 5185 fixed are not listed here). 5186 5187 GCC 4.3.5 5188 5189 This is the [29]list of problem reports (PRs) from GCC's bug tracking 5190 system that are known to be fixed in the 4.3.5 release. This list might 5191 not be complete (that is, it is possible that some PRs that have been 5192 fixed are not listed here). 5193 5194 GCC 4.3.6 5195 5196 This is the [30]list of problem reports (PRs) from GCC's bug tracking 5197 system that are known to be fixed in the 4.3.6 release. This list might 5198 not be complete (that is, it is possible that some PRs that have been 5199 fixed are not listed here). 5200 5201 5202 For questions related to the use of GCC, please consult these web 5203 pages and the [31]GCC manuals. If that fails, the 5204 [32]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5205 web pages and the development of GCC are welcome on our developer 5206 list at [33]gcc (a] gcc.gnu.org. All of [34]our lists have public 5207 archives. 5208 5209 Copyright (C) [35]Free Software Foundation, Inc. Verbatim copying and 5210 distribution of this entire article is permitted in any medium, 5211 provided this notice is preserved. 5212 5213 These pages are [36]maintained by the GCC team. Last modified 5214 2014-06-28[37]. 5215 5216 References 5217 5218 1. http://gcc.gnu.org/gcc-4.3/changes.html#4.3.5 5219 2. http://gmplib.org/ 5220 3. http://www.mpfr.org/ 5221 4. https://gcc.gnu.org/install/prerequisites.html 5222 5. https://gcc.gnu.org/ml/gcc-announce/2001/msg00000.html 5223 6. https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options 5224 7. http://gcc.gnu.org/gcc-4.3/porting_to.html 5225 8. http://www.mpfr.org/ 5226 9. http://www.mpfr.org/ 5227 10. http://www.mpfr.org/ 5228 11. https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html 5229 12. http://gcc.gnu.org/gcc-4.3/cxx0x_status.html 5230 13. http://gcc.gnu.org/gcc-4.3/cxx0x_status.html 5231 14. https://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#m anual.intro.status.standard.tr1 5232 15. https://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html 5233 16. http://gmplib.org/ 5234 17. http://www.mpfr.org/ 5235 18. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#Code-Gen-Options 5236 19. https://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfinit-local-zero_007d-167 5237 20. https://gcc.gnu.org/onlinedocs/gcc-4.3.0/gfortran/GAMMA.html 5238 21. https://gcc.gnu.org/onlinedocs/gcc-4.3.0/gfortran/LGAMMA.html 5239 22. https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html 5240 23. https://gcc.gnu.org/onlinedocs/gfortran/BOZ-literal-constants.html 5241 24. https://gcc.gnu.org/onlinedocs/libstdc++/ 5242 25. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.1 5243 26. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.2 5244 27. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.3 5245 28. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.4 5246 29. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.5 5247 30. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.6 5248 31. https://gcc.gnu.org/onlinedocs/ 5249 32. mailto:gcc-help (a] gcc.gnu.org 5250 33. mailto:gcc (a] gcc.gnu.org 5251 34. https://gcc.gnu.org/lists.html 5252 35. http://www.fsf.org/ 5253 36. https://gcc.gnu.org/about.html 5254 37. http://validator.w3.org/check/referer 5255 ====================================================================== 5256 http://gcc.gnu.org/gcc-4.2/index.html 5257 5258 GCC 4.2 Release Series 5259 5260 May 19, 2008 5261 5262 The [1]GNU project and the GCC developers are pleased to announce the 5263 release of GCC 4.2.4. 5264 5265 This release is a bug-fix release, containing fixes for regressions in 5266 GCC 4.2.3 relative to previous releases of GCC. 5267 5268 Release History 5269 5270 GCC 4.2.4 5271 May 19, 2008 ([2]changes) 5272 5273 GCC 4.2.3 5274 February 1, 2008 ([3]changes) 5275 5276 GCC 4.2.2 5277 October 7, 2007 ([4]changes) 5278 5279 GCC 4.2.1 5280 July 18, 2007 ([5]changes) 5281 5282 GCC 4.2.0 5283 May 13, 2007 ([6]changes) 5284 5285 References and Acknowledgements 5286 5287 GCC used to stand for the GNU C Compiler, but since the compiler 5288 supports several other languages aside from C, it now stands for the 5289 GNU Compiler Collection. 5290 5291 A list of [7]successful builds is updated as new information becomes 5292 available. 5293 5294 The GCC developers would like to thank the numerous people that have 5295 contributed new features, improvements, bug fixes, and other changes as 5296 well as test results to GCC. This [8]amazing group of volunteers is 5297 what makes GCC successful. 5298 5299 For additional information about GCC please refer to the [9]GCC project 5300 web site or contact the [10]GCC development mailing list. 5301 5302 To obtain GCC please use [11]our mirror sites or [12]our SVN server. 5303 5304 5305 For questions related to the use of GCC, please consult these web 5306 pages and the [13]GCC manuals. If that fails, the 5307 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5308 web pages and the development of GCC are welcome on our developer 5309 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 5310 archives. 5311 5312 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 5313 distribution of this entire article is permitted in any medium, 5314 provided this notice is preserved. 5315 5316 These pages are [18]maintained by the GCC team. Last modified 5317 2014-06-28[19]. 5318 5319 References 5320 5321 1. http://www.gnu.org/ 5322 2. http://gcc.gnu.org/gcc-4.2/changes.html 5323 3. http://gcc.gnu.org/gcc-4.2/changes.html 5324 4. http://gcc.gnu.org/gcc-4.2/changes.html 5325 5. http://gcc.gnu.org/gcc-4.2/changes.html 5326 6. http://gcc.gnu.org/gcc-4.2/changes.html 5327 7. http://gcc.gnu.org/gcc-4.2/buildstat.html 5328 8. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 5329 9. http://gcc.gnu.org/index.html 5330 10. mailto:gcc (a] gcc.gnu.org 5331 11. http://gcc.gnu.org/mirrors.html 5332 12. http://gcc.gnu.org/svn.html 5333 13. https://gcc.gnu.org/onlinedocs/ 5334 14. mailto:gcc-help (a] gcc.gnu.org 5335 15. mailto:gcc (a] gcc.gnu.org 5336 16. https://gcc.gnu.org/lists.html 5337 17. http://www.fsf.org/ 5338 18. https://gcc.gnu.org/about.html 5339 19. http://validator.w3.org/check/referer 5340 ====================================================================== 5341 http://gcc.gnu.org/gcc-4.2/changes.html 5342 5343 GCC 4.2 Release Series 5344 Changes, New Features, and Fixes 5345 5346 Caveats 5347 5348 * GCC no longer accepts the -fshared-data option. This option has had 5349 no effect in any GCC 4 release; the targets to which the option 5350 used to apply had been removed before GCC 4.0. 5351 5352 General Optimizer Improvements 5353 5354 * New command-line options specify the possible relationships among 5355 parameters and between parameters and global data. For example, 5356 -fargument-noalias-anything specifies that arguments do not alias 5357 any other storage. 5358 Each language will automatically use whatever option is required by 5359 the language standard. You should not need to use these options 5360 yourself. 5361 5362 New Languages and Language specific improvements 5363 5364 * [1]OpenMP is now supported for the C, C++ and Fortran compilers. 5365 * New command-line options -fstrict-overflow and -Wstrict-overflow 5366 have been added. -fstrict-overflow tells the compiler that it may 5367 assume that the program follows the strict signed overflow 5368 semantics permitted for the language: for C and C++ this means that 5369 the compiler may assume that signed overflow does not occur. For 5370 example, a loop like 5371 for (i = 1; i > 0; i *= 2) 5372 5373 is presumably intended to continue looping until i overflows. With 5374 -fstrict-overflow, the compiler may assume that signed overflow 5375 will not occur, and transform this into an infinite loop. 5376 -fstrict-overflow is turned on by default at -O2, and may be 5377 disabled via -fno-strict-overflow. The -Wstrict-overflow option may 5378 be used to warn about cases where the compiler assumes that signed 5379 overflow will not occur. It takes five different levels: 5380 -Wstrict-overflow=1 to 5. See the [2]documentation for details. 5381 -Wstrict-overflow=1 is enabled by -Wall. 5382 * The new command-line option -fno-toplevel-reorder directs GCC to 5383 emit top-level functions, variables, and asm statements in the same 5384 order that they appear in the input file. This is intended to 5385 support existing code which relies on a particular ordering (for 5386 example, code which uses top-level asm statements to switch 5387 sections). For new code, it is generally better to use function and 5388 variable attributes. The -fno-toplevel-reorder option may be used 5389 for most cases which currently use -fno-unit-at-a-time. The 5390 -fno-unit-at-a-time option will be removed in some future version 5391 of GCC. If you know of a case which requires -fno-unit-at-a-time 5392 which is not fixed by -fno-toplevel-reorder, please open a bug 5393 report. 5394 5395 C family 5396 5397 * The pragma redefine_extname will now macro expand its tokens for 5398 compatibility with SunPRO. 5399 * In the next release of GCC, 4.3, -std=c99 or -std=gnu99 will direct 5400 GCC to handle inline functions as specified in the C99 standard. In 5401 preparation for this, GCC 4.2 will warn about any use of non-static 5402 inline functions in gnu99 or c99 mode. This new warning may be 5403 disabled with the new gnu_inline function attribute or the new 5404 -fgnu89-inline command-line option. Also, GCC 4.2 and later will 5405 define one of the preprocessor macros __GNUC_GNU_INLINE__ or 5406 __GNUC_STDC_INLINE__ to indicate the semantics of inline functions 5407 in the current compilation. 5408 * A new command-line option -Waddress has been added to warn about 5409 suspicious uses of memory addresses as, for example, using the 5410 address of a function in a conditional expression, and comparisons 5411 against the memory address of a string literal. This warning is 5412 enabled by -Wall. 5413 5414 C++ 5415 5416 * C++ visibility handling has been overhauled. 5417 Restricted visiblity is propagated from classes to members, from 5418 functions to local statics, and from templates and template 5419 arguments to instantiations, unless the latter has explicitly 5420 declared visibility. 5421 The visibility attribute for a class must come between the 5422 class-key and the name, not after the closing brace. 5423 Attributes are now allowed for enums and elaborated-type-specifiers 5424 that only declare a type. 5425 Members of the anonymous namespace are now local to a particular 5426 translation unit, along with any other declarations which use them, 5427 though they are still treated as having external linkage for 5428 language semantics. 5429 * The (undocumented) extension which permitted templates with default 5430 arguments to be bound to template template parameters with fewer 5431 parameters has been removed. For example: 5432 template <template <typename> class C> 5433 void f(C<double>) {} 5434 5435 template <typename T, typename U = int> 5436 struct S {}; 5437 5438 template void f(S<double>); 5439 5440 is no longer accepted by G++. The reason this code is not accepted 5441 is that S is a template with two parameters; therefore, it cannot 5442 be bound to C which has only one parameter. 5443 * The <?, >?, <?=, and >?= operators, deprecated in previous GCC 5444 releases, have been removed. 5445 * The command-line option -fconst-strings, deprecated in previous GCC 5446 releases, has been removed. 5447 * The configure variable enable-__cxa_atexit is now enabled by 5448 default for more targets. Enabling this variable is necessary in 5449 order for static destructors to be executed in the correct order, 5450 but it depends upon the presence of a non-standard C library in the 5451 target library in order to work. The variable is now enabled for 5452 more targets which are known to have suitable C libraries. 5453 * -Wextra will produce warnings for if statements with a semicolon as 5454 the only body, to catch code like: 5455 if (a); 5456 return 1; 5457 return 0; 5458 5459 To suppress the warning in valid cases, use { } instead. 5460 * The C++ frontend now also produces strict aliasing warnings when 5461 -fstrict-aliasing -Wstrict-aliasing is in effect. 5462 5463 Runtime Library (libstdc++) 5464 5465 * Added support for TR1 <random>, <complex>, and C compatibility 5466 headers. In addition, a lock-free version of shared_ptr was 5467 contributed as part of Phillip Jordan's Google Summer of Code 5468 project on lock-free containers. ([3]Implementation status of TR1) 5469 * In association with the Summer of Code work on lock-free 5470 containers, the interface for atomic builtins was adjusted, 5471 creating simpler alternatives for non-threaded code paths. Also, 5472 usage was consolidated and all elements were moved from namespace 5473 std to namespace__gnu_cxx. Affected interfaces are the functions 5474 __exchange_and_add, __atomic_add, and the objects __mutex, 5475 __recursive_mutex, and __scoped_lock. 5476 * Support for versioning weak symbol names via namespace association 5477 was added. However, as this changes the names of exported symbols, 5478 this is turned off by default in the current ABI. Intrepid users 5479 can enable this feature by using 5480 --enable-symvers=gnu-versioned-namespace during configuration. 5481 * Revised, simplified, and expanded policy-based associative 5482 containers, including data types for tree and trie forms 5483 (basic_tree, tree, trie), lists (list_update), and both 5484 collision-chaining and probing hash-based containers 5485 (basic_hash_table, cc_hash_table, gp_hash_table). More details per 5486 the [4]documentation. 5487 * The implementation of the debug mode was modified, whereby the 5488 debug namespaces were nested inside of namespace std and namespace 5489 __gnu_cxx in order to resolve some long standing corner cases 5490 involving name lookup. Debug functionality from the policy-based 5491 data structures was consolidated and enabled with the single macro, 5492 _GLIBCXX_DEBUG. See PR 26142 for more information. 5493 * Added extensions for type traits: __conditional_type, 5494 __numeric_traits, __add_unsigned, __removed_unsigned, __enable_if. 5495 * Added a typelist implementation for compile-time meta-programming. 5496 Elements for typelist construction and operation can be found 5497 within namespace __gnu_cxx::typelist. 5498 * Added a new allocator, __gnu_cxx::throw_allocator, for testing 5499 exception-safety. 5500 * Enabled library-wide visibility control, allowing -fvisibility to 5501 be used. 5502 * Consolidated all nested namespaces and the conversion of 5503 __gnu_internal implementation-private details to anonymous 5504 namespaces whenever possible. 5505 * Implemented LWG resolutions DR 431 and DR 538. 5506 5507 Fortran 5508 5509 * Support for allocatable components has been added (TR 15581 and 5510 Fortran 2003). 5511 * Support for the Fortran 2003 streaming IO extension has been added. 5512 * The GNU Fortran compiler now uses 4-byte record markers by default 5513 for unformatted files to be compatible with g77 and most other 5514 compilers. The implementation allows for records greater than 2 GB 5515 and is compatible with several other compilers. Older versions of 5516 gfortran used 8-byte record markers by default (on most systems). 5517 In order to change the length of the record markers, e.g. to read 5518 unformatted files created by older gfortran versions, the 5519 [5]-frecord-marker=8 option can be used. 5520 5521 Java (GCJ) 5522 5523 * A new command-line option -static-libgcj has been added for targets 5524 that use a linker compatible with GNU Binutils. As its name 5525 implies, this causes libgcj to be linked statically. In some cases 5526 this causes the resulting executable to start faster and use less 5527 memory than if the shared version of libgcj were used. However 5528 caution should be used as it can also cause essential parts of the 5529 library to be omitted. Some of these issues are discussed in: 5530 [6]https://gcc.gnu.org/wiki/Statically_linking_libgcj 5531 * fastjar is no longer bundled with GCC. To build libgcj, you will 5532 need either InfoZIP (both zip and unzip) or an external jar 5533 program. In the former case, the GCC build will install a jar shell 5534 script that is based on InfoZIP and provides the same functionality 5535 as fastjar. 5536 5537 New Targets and Target Specific Improvements 5538 5539 IA-32/x86-64 5540 5541 * -mtune=generic can now be used to generate code running well on 5542 common x86 chips. This includes AMD Athlon, AMD Opteron, Intel 5543 Pentium-M, Intel Pentium 4 and Intel Core 2. 5544 * -mtune=native and -march=native will produce code optimized for the 5545 host architecture as detected using the cpuid instruction. 5546 * Added a new command-line option -fstackrealign and and 5547 __attribute__ ((force_align_arg_pointer)) to realign the stack at 5548 runtime. This allows functions compiled with a vector-aligned stack 5549 to be invoked from legacy objects that keep only word-alignment. 5550 5551 SPARC 5552 5553 * The default CPU setting has been changed from V7 to V9 in 32-bit 5554 mode on Solaris 7 and above. This is already the case in 64-bit 5555 mode. It can be overridden by specifying --with-cpu at configure 5556 time. 5557 * Back-end support of built-in functions for atomic memory access has 5558 been implemented. 5559 * Support for the Sun UltraSPARC T1 (Niagara) processor has been 5560 added. 5561 5562 M32C 5563 5564 * Various bug fixes have made some functions (notably, functions 5565 returning structures) incompatible with previous releases. 5566 Recompiling all libraries is recommended. Note that code quality 5567 has considerably improved since 4.1, making a recompile even more 5568 beneficial. 5569 5570 MIPS 5571 5572 * Added support for the Broadcom SB-1A core. 5573 5574 IA-64 5575 5576 * Added support for IA-64 data and control speculation. By default 5577 speculation is enabled only during second scheduler pass. A number 5578 of machine flags was introduced to control the usage of speculation 5579 for both scheduler passes. 5580 5581 HPPA 5582 5583 * Added Java language support (libffi and libjava) for 32-bit HP-UX 5584 11 target. 5585 5586 Obsolete Systems 5587 5588 Documentation improvements 5589 5590 PDF Documentation 5591 5592 * A make pdf target has been added to the top-level makefile, 5593 enabling automated production of PDF documentation files. 5594 (Front-ends external to GCC should modify their Make-lang.in file 5595 to add a lang.pdf: target.) 5596 5597 Other significant improvements 5598 5599 Build system improvements 5600 5601 * All the components of the compiler are now bootstrapped by default. 5602 This improves the resilience to bugs in the system compiler or 5603 binary compatibility problems, as well as providing better testing 5604 of GCC 4.2 itself. In addition, if you build the compiler from a 5605 combined tree, the assembler, linker, etc. will also be 5606 bootstrapped (i.e. built with themselves). 5607 You can disable this behavior, and go back to the pre-GCC 4.2 set 5608 up, by configuring GCC with --disable-bootstrap. 5609 * The rules that configure follows to find target tools resemble more 5610 closely the locations that the built compiler will search. In 5611 addition, you can use the new configure option --with-target-tools 5612 to specify where to find the target tools used during the build, 5613 without affecting what the built compiler will use. 5614 This can be especially useful when building packages of GCC. For 5615 example, you may want to build GCC with GNU as or ld, even if the 5616 resulting compiler to work with the native assembler and linker. To 5617 do so, you can use --with-target-tools to point to the native 5618 tools. 5619 5620 Incompatible changes to the build system 5621 5622 * Front-ends external to GCC should modify their Make-lang.in file to 5623 replace double-colon rules (e.g. dvi::) with normal rules (like 5624 lang.dvi:). Front-end makefile hooks do not use double-colon rules 5625 anymore. 5626 * Up to GCC 4.1, a popular way to specify the target tools used 5627 during the build was to create directories named gas, binutils, 5628 etc. in the build tree, and create links to the tools from there. 5629 This does not work any more when the compiler is bootstrapped. The 5630 new configure option --with-target-tools provides a better way to 5631 achieve the same effect, and works for all native and cross 5632 settings. 5633 5634 5635 For questions related to the use of GCC, please consult these web 5636 pages and the [7]GCC manuals. If that fails, the 5637 [8]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5638 web pages and the development of GCC are welcome on our developer 5639 list at [9]gcc (a] gcc.gnu.org. All of [10]our lists have public 5640 archives. 5641 5642 Copyright (C) [11]Free Software Foundation, Inc. Verbatim copying and 5643 distribution of this entire article is permitted in any medium, 5644 provided this notice is preserved. 5645 5646 These pages are [12]maintained by the GCC team. Last modified 5647 2014-06-28[13]. 5648 5649 References 5650 5651 1. http://gcc.gnu.org/projects/gomp/ 5652 2. https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html 5653 3. https://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#manual.intro.status.standard.tr1 5654 4. https://gcc.gnu.org/onlinedocs/libstdc++/ext/pb_ds/index.html 5655 5. https://gcc.gnu.org/onlinedocs/gfortran/Runtime-Options.html 5656 6. https://gcc.gnu.org/wiki/Statically_linking_libgcj 5657 7. https://gcc.gnu.org/onlinedocs/ 5658 8. mailto:gcc-help (a] gcc.gnu.org 5659 9. mailto:gcc (a] gcc.gnu.org 5660 10. https://gcc.gnu.org/lists.html 5661 11. http://www.fsf.org/ 5662 12. https://gcc.gnu.org/about.html 5663 13. http://validator.w3.org/check/referer 5664 ====================================================================== 5665 http://gcc.gnu.org/gcc-4.1/index.html 5666 5667 GCC 4.1 Release Series 5668 5669 February 13, 2007 5670 5671 The [1]GNU project and the GCC developers are pleased to announce the 5672 release of GCC 4.1.2. 5673 5674 This release is a bug-fix release, containing fixes for regressions in 5675 GCC 4.1.1 relative to previous releases of GCC. 5676 5677 Release History 5678 5679 GCC 4.1.2 5680 February 13, 2007 ([2]changes) 5681 5682 GCC 4.1.1 5683 May 24, 2006 ([3]changes) 5684 5685 GCC 4.1.0 5686 February 28, 2006 ([4]changes) 5687 5688 References and Acknowledgements 5689 5690 GCC used to stand for the GNU C Compiler, but since the compiler 5691 supports several other languages aside from C, it now stands for the 5692 GNU Compiler Collection. 5693 5694 A list of [5]successful builds is updated as new information becomes 5695 available. 5696 5697 The GCC developers would like to thank the numerous people that have 5698 contributed new features, improvements, bug fixes, and other changes as 5699 well as test results to GCC. This [6]amazing group of volunteers is 5700 what makes GCC successful. 5701 5702 For additional information about GCC please refer to the [7]GCC project 5703 web site or contact the [8]GCC development mailing list. 5704 5705 To obtain GCC please use [9]our mirror sites or [10]our SVN server. 5706 5707 5708 For questions related to the use of GCC, please consult these web 5709 pages and the [11]GCC manuals. If that fails, the 5710 [12]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5711 web pages and the development of GCC are welcome on our developer 5712 list at [13]gcc (a] gcc.gnu.org. All of [14]our lists have public 5713 archives. 5714 5715 Copyright (C) [15]Free Software Foundation, Inc. Verbatim copying and 5716 distribution of this entire article is permitted in any medium, 5717 provided this notice is preserved. 5718 5719 These pages are [16]maintained by the GCC team. Last modified 5720 2014-06-28[17]. 5721 5722 References 5723 5724 1. http://www.gnu.org/ 5725 2. http://gcc.gnu.org/gcc-4.1/changes.html#4.1.2 5726 3. http://gcc.gnu.org/gcc-4.1/changes.html 5727 4. http://gcc.gnu.org/gcc-4.1/changes.html 5728 5. http://gcc.gnu.org/gcc-4.1/buildstat.html 5729 6. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 5730 7. http://gcc.gnu.org/index.html 5731 8. mailto:gcc (a] gcc.gnu.org 5732 9. http://gcc.gnu.org/mirrors.html 5733 10. http://gcc.gnu.org/svn.html 5734 11. https://gcc.gnu.org/onlinedocs/ 5735 12. mailto:gcc-help (a] gcc.gnu.org 5736 13. mailto:gcc (a] gcc.gnu.org 5737 14. https://gcc.gnu.org/lists.html 5738 15. http://www.fsf.org/ 5739 16. https://gcc.gnu.org/about.html 5740 17. http://validator.w3.org/check/referer 5741 ====================================================================== 5742 http://gcc.gnu.org/gcc-4.1/changes.html 5743 5744 GCC 4.1 Release Series 5745 Changes, New Features, and Fixes 5746 5747 The latest release in the 4.1 release series is [1]GCC 4.1.2. 5748 5749 Caveats 5750 5751 General Optimizer Improvements 5752 5753 * GCC now has infrastructure for inter-procedural optimizations and 5754 the following inter-procedural optimizations are implemented: 5755 + Profile guided inlining. When doing profile feedback guided 5756 optimization, GCC can now use the profile to make better 5757 informed decisions on whether inlining of a function is 5758 profitable or not. This means that GCC will no longer inline 5759 functions at call sites that are not executed very often, and 5760 that functions at hot call sites are more likely to be 5761 inlined. 5762 A new parameter min-inline-recursive-probability is also now 5763 available to throttle recursive inlining of functions with 5764 small average recursive depths. 5765 + Discovery of pure and const functions, a form of side-effects 5766 analysis. While older GCC releases could also discover such 5767 special functions, the new IPA-based pass runs earlier so that 5768 the results are available to more optimizers. The pass is also 5769 simply more powerful than the old one. 5770 + Analysis of references to static variables and type escape 5771 analysis, also forms of side-effects analysis. The results of 5772 these passes allow the compiler to be less conservative about 5773 call-clobbered variables and references. This results in more 5774 redundant loads being eliminated and in making static 5775 variables candidates for register promotion. 5776 + Improvement of RTL-based alias analysis. The results of type 5777 escape analysis are fed to the RTL type-based alias analyzer, 5778 allowing it to disambiguate more memory references. 5779 + Interprocedural constant propagation and function versioning. 5780 This pass looks for functions that are always called with the 5781 same constant value for one or more of the function arguments, 5782 and propagates those constants into those functions. 5783 + GCC will now eliminate static variables whose usage was 5784 optimized out. 5785 + -fwhole-program --combine can now be used to make all 5786 functions in program static allowing whole program 5787 optimization. As an exception, the main function and all 5788 functions marked with the new externally_visible attribute are 5789 kept global so that programs can link with runtime libraries. 5790 * GCC can now do a form of partial dead code elimination (PDCE) that 5791 allows code motion of expressions to the paths where the result of 5792 the expression is actually needed. This is not always a win, so the 5793 pass has been limited to only consider profitable cases. Here is an 5794 example: 5795 int foo (int *, int *); 5796 int 5797 bar (int d) 5798 { 5799 int a, b, c; 5800 b = d + 1; 5801 c = d + 2; 5802 a = b + c; 5803 if (d) 5804 { 5805 foo (&b, &c); 5806 a = b + c; 5807 } 5808 printf ("%d\n", a); 5809 } 5810 5811 The a = b + c can be sunk to right before the printf. Normal code 5812 sinking will not do this, it will sink the first one above into the 5813 else-branch of the conditional jump, which still gives you two 5814 copies of the code. 5815 * GCC now has a value range propagation pass. This allows the 5816 compiler to eliminate bounds checks and branches. The results of 5817 the pass can also be used to accurately compute branch 5818 probabilities. 5819 * The pass to convert PHI nodes to straight-line code (a form of 5820 if-conversion for GIMPLE) has been improved significantly. The two 5821 most significant improvements are an improved algorithm to 5822 determine the order in which the PHI nodes are considered, and an 5823 improvement that allow the pass to consider if-conversions of basic 5824 blocks with more than two predecessors. 5825 * Alias analysis improvements. GCC can now differentiate between 5826 different fields of structures in Tree-SSA's virtual operands form. 5827 This lets stores/loads from non-overlapping structure fields not 5828 conflict. A new algorithm to compute points-to sets was contributed 5829 that can allows GCC to see now that p->a and p->b, where p is a 5830 pointer to a structure, can never point to the same field. 5831 * Various enhancements to auto-vectorization: 5832 + Incrementally preserve SSA form when vectorizing. 5833 + Incrementally preserve loop-closed form when vectorizing. 5834 + Improvements to peeling for alignment: generate better code 5835 when the misalignment of an access is known at compile time, 5836 or when different accesses are known to have the same 5837 misalignment, even if the misalignment amount itself is 5838 unknown. 5839 + Consider dependence distance in the vectorizer. 5840 + Externalize generic parts of data reference analysis to make 5841 this analysis available to other passes. 5842 + Vectorization of conditional code. 5843 + Reduction support. 5844 * GCC can now partition functions in sections of hot and cold code. 5845 This can significantly improve performance due to better 5846 instruction cache locality. This feature works best together with 5847 profile feedback driven optimization. 5848 * A new pass to avoid saving of unneeded arguments to the stack in 5849 vararg functions if the compiler can prove that they will not be 5850 needed. 5851 * Transition of basic block profiling to tree level implementation 5852 has been completed. The new implementation should be considerably 5853 more reliable (hopefully avoiding profile mismatch errors when 5854 using -fprofile-use or -fbranch-probabilities) and can be used to 5855 drive higher level optimizations, such as inlining. 5856 The -ftree-based-profiling command-line option was removed and 5857 -fprofile-use now implies disabling old RTL level loop optimizer 5858 (-fno-loop-optimize). Speculative prefetching optimization 5859 (originally enabled by -fspeculative-prefetching) was removed. 5860 5861 New Languages and Language specific improvements 5862 5863 C and Objective-C 5864 5865 * The old Bison-based C and Objective-C parser has been replaced by a 5866 new, faster hand-written recursive-descent parser. 5867 5868 Ada 5869 5870 * The build infrastructure for the Ada runtime library and tools has 5871 been changed to be better integrated with the rest of the build 5872 infrastructure of GCC. This should make doing cross builds of Ada a 5873 bit easier. 5874 5875 C++ 5876 5877 * ARM-style name-injection of friend declarations is no longer the 5878 default. For example: 5879 struct S { 5880 friend void f(); 5881 }; 5882 5883 void g() { f(); } 5884 will not be accepted; instead a declaration of f will need to be 5885 present outside of the scope of S. The new -ffriend-injection 5886 option will enable the old behavior. 5887 * The (undocumented) extension which permitted templates with default 5888 arguments to be bound to template template parameters with fewer 5889 parameters has been deprecated, and will be removed in the next 5890 major release of G++. For example: 5891 template <template <typename> class C> 5892 void f(C<double>) {} 5893 5894 template <typename T, typename U = int> 5895 struct S {}; 5896 5897 template void f(S<double>); 5898 5899 makes use of the deprecated extension. The reason this code is not 5900 valid ISO C++ is that S is a template with two parameters; 5901 therefore, it cannot be bound to C which has only one parameter. 5902 5903 Runtime Library (libstdc++) 5904 5905 * Optimization work: 5906 + A new implementation of std::search_n is provided, better 5907 performing in case of random access iterators. 5908 + Added further efficient specializations of istream functions, 5909 i.e., character array and string extractors. 5910 + Other smaller improvements throughout. 5911 * Policy-based associative containers, designed for high-performance, 5912 flexibility and semantic safety are delivered in ext/pb_assoc. 5913 * A versatile string class, __gnu_cxx::__versa_string, providing 5914 facilities conforming to the standard requirements for 5915 basic_string, is delivered in <ext/vstring.h>. In particular: 5916 + Two base classes are provided: the default one avoids 5917 reference counting and is optimized for short strings; the 5918 alternate one, still uses it while improving in a few low 5919 level areas (e.g., alignment). See vstring_fwd.h for some 5920 useful typedefs. 5921 + Various algorithms have been rewritten (e.g., replace), the 5922 code streamlined and simple optimizations added. 5923 + Option 3 of DR 431 is implemented for both available bases, 5924 thus improving the support for stateful allocators. 5925 * As usual, many bugs have been fixed (e.g., libstdc++/13583, 5926 libstdc++/23953) and LWG resolutions put into effect for the first 5927 time (e.g., DR 280, DR 464, N1780 recommendations for DR 233, TR1 5928 Issue 6.19). The implementation status of TR1 is now tracked in the 5929 docs in tr1.html. 5930 5931 Objective-C++ 5932 5933 * A new language front end for Objective-C++ has been added. This 5934 language allows users to mix the object oriented features of 5935 Objective-C with those of C++. 5936 5937 Java (GCJ) 5938 5939 * Core library (libgcj) updates based on GNU Classpath 0.15 - 0.19 5940 features (plus some 0.20 bug-fixes) 5941 + Networking 5942 o The java.net.HttpURLConnection implementation no longer 5943 buffers the entire response body in memory. This means 5944 that response bodies larger than available memory can now 5945 be handled. 5946 + (N)IO 5947 o NIO FileChannel.map implementation, fast bulk put 5948 implementation for DirectByteBuffer (speeds up this 5949 method 10x). 5950 o FileChannel.lock() and FileChannel.force() implemented. 5951 + XML 5952 o gnu.xml fix for nodes created outside a namespace 5953 context. 5954 o Add support for output indenting and 5955 cdata-section-elements output instruction in 5956 xml.transform. 5957 o xml.xpath corrections for cases where elements/attributes 5958 might have been created in non-namespace-aware mode. 5959 Corrections to handling of XSL variables and minor 5960 conformance updates. 5961 + AWT 5962 o GNU JAWT implementation, the AWT Native Interface, which 5963 allows direct access to native screen resources from 5964 within a Canvas's paint method. GNU Classpath Examples 5965 comes with a Demo, see libjava/classpath/examples/README. 5966 o awt.datatransfer updated to 1.5 with support for 5967 FlavorEvents. The gtk+ awt peers now allow copy/paste of 5968 text, images, URIs/files and serialized objects with 5969 other applications and tracking clipboard change events 5970 with gtk+ 2.6 (for gtk+ 2.4 only text and serialized 5971 objects are supported). A GNU Classpath Examples 5972 datatransfer Demo was added to show the new 5973 functionality. 5974 o Split gtk+ awt peers event handling in two threads and 5975 improve gdk lock handling (solves several awt lock ups). 5976 o Speed up awt Image loading. 5977 o Better gtk+ scrollbar peer implementation when using gtk+ 5978 >= 2.6. 5979 o Handle image loading errors correctly for gdkpixbuf and 5980 MediaTracker. 5981 o Better handle GDK lock. Properly prefix gtkpeer native 5982 functions (cp_gtk). 5983 o GdkGraphics2D has been updated to use Cairo 0.5.x or 5984 higher. 5985 o BufferedImage and GtkImage rewrites. All image drawing 5986 operations should now work correctly (flipping requires 5987 gtk+ >= 2.6) 5988 o Future Graphics2D, image and text work is documented at: 5989 [2]http://developer.classpath.org/mediation/ClasspathGrap 5990 hicsImagesText 5991 o When gtk+ 2.6 or higher is installed the default log 5992 handler will produce stack traces whenever a WARNING, 5993 CRITICAL or ERROR message is produced. 5994 + Free Swing 5995 o The RepaintManager has been reworked for more efficient 5996 painting, especially for large GUIs. 5997 o The layout manager OverlayLayout has been implemented, 5998 the BoxLayout has been rewritten to make use of the 5999 SizeRequirements utility class and caching for more 6000 efficient layout. 6001 o Improved accessibility support. 6002 o Significant progress has been made in the implementation 6003 of the javax.swing.plaf.metal package, with most UI 6004 delegates in a working state now. Please test this with 6005 your own applications and provide feedback that will help 6006 us to improve this package. 6007 o The GUI demo (gnu.classpath.examples.swing.Demo) has been 6008 extended to highlight various features in our Free Swing 6009 implementation. And it includes a look and feel switcher 6010 for Metal (default), Ocean and GNU themes. 6011 o The javax.swing.plaf.multi package is now implemented. 6012 o Editing and several key actions for JTree and JTable were 6013 implemented. 6014 o Lots of icons and look and feel improvements for Free 6015 Swing basic and metal themes were added. Try running the 6016 GNU Classpath Swing Demo in examples 6017 (gnu.classpath.examples.swing.Demo) with: 6018 -Dswing.defaultlaf=javax.swing.plaf.basic.BasicLookAndFee 6019 l or 6020 -Dswing.defaultlaf=javax.swing.plaf.metal.MetalLookAndFee 6021 l 6022 o Start of styled text capabilites for java.swing.text. 6023 o DefaultMutableTreeNode pre-order, post-order, depth-first 6024 and breadth-first traversal enumerations implemented. 6025 o JInternalFrame colors and titlebar draw properly. 6026 o JTree is working up to par (icons, selection and keyboard 6027 traversal). 6028 o JMenus were made more compatible in visual and 6029 programmatic behavior. 6030 o JTable changeSelection and multiple selections 6031 implemented. 6032 o JButton and JToggleButton change states work properly 6033 now. 6034 o JFileChooser fixes. 6035 o revalidate() and repaint() fixes which make Free Swing 6036 much more responsive. 6037 o MetalIconFactory implemented. 6038 o Free Swing Top-Level Compatibility. JFrame, JDialog, 6039 JApplet, JInternalFrame, and JWindow are now 1.5 6040 compatible in the sense that you can call add() and 6041 setLayout() directly on them, which will have the same 6042 effect as calling getContentPane().add() and 6043 getContentPane().setLayout(). 6044 o The JTree interface has been completed. JTrees now 6045 recognizes mouse clicks and selections work. 6046 o BoxLayout works properly now. 6047 o Fixed GrayFilter to actually work. 6048 o Metal SplitPane implemented. 6049 o Lots of Free Swing text and editor stuff work now. 6050 + Free RMI and Corba 6051 o Andrew Watson, Vice President and Technical Director of 6052 the Object Management Group, has officially assigned us 6053 20 bit Vendor Minor Code Id: 0x47430 ("GC") that will 6054 mark remote classpath-specific system exceptions. 6055 Obtaining the VMCID means that GNU Classpath now is a 6056 recogniseable type of node in a highly interoperable 6057 CORBA world. 6058 o GNU Classpath now includes the first working draft to 6059 support the RMI over IIOP protocol. The current 6060 implementation is capable of remote invocations, 6061 transferring various Serializables and Externalizables 6062 via RMI-IIOP protocol. It can flatten graphs and, at 6063 least for the simple cases, is interoperable with 1.5 6064 JDKs. 6065 o org.omg.PortableInterceptor and related functionality in 6066 other packages is now implemented: 6067 # The sever and client interceptors work as required 6068 since 1.4. 6069 # The IOR interceptor works as needed for 1.5. 6070 o The org.omg.DynamicAny package is completed and passes 6071 the prepared tests. 6072 o The Portable Object Adapter should now support the output 6073 of the recent IDL to java compilers. These compilers now 6074 generate servants and not CORBA objects as before, making 6075 the output depend on the existing POA implementation. 6076 Completing POA means that such code can already be tried 6077 to run on Classpath. Our POA is tested for the following 6078 usager scenarios: 6079 # POA converts servant to the CORBA object. 6080 # Servant provides to the CORBA object. 6081 # POA activates new CORBA object with the given Object 6082 Id (byte array) that is later accessible for the 6083 servant. 6084 # During the first call, the ServantActivator provides 6085 servant for this and all subsequent calls on the 6086 current object. 6087 # During each call, the ServantLocator provides 6088 servant for this call only. 6089 # ServantLocator or ServantActivator forwards call to 6090 another server. 6091 # POA has a single servant, responsible for all 6092 objects. 6093 # POA has a default servant, but some objects are 6094 explicitly connected to they specific servants. 6095 The POA is verified using tests from the former 6096 cost.omg.org. 6097 o The CORBA implementation is now a working prototype that 6098 should support features up to 1.3 inclusive. We invite 6099 groups writing CORBA dependent applications to try 6100 Classpath implementation, reporting any possible bugs. 6101 The CORBA prototype is interoperable with Sun's 6102 implementation v 1.4, transferring object references, 6103 primitive types, narrow and wide strings, arrays, 6104 structures, trees, abstract interfaces and value types 6105 (feature of CORBA 2.3) between these two platforms. 6106 Remote exceptions are transferred and handled correctly. 6107 The stringified object references (IORs) from various 6108 sources are parsed as required. The transient (for 6109 current session) and permanent (till jre restart) 6110 redirections work. Both Little and Big Endian encoded 6111 messages are accepted. The implementation is verified 6112 using tests from the former cost.omg.org. The current 6113 release includes working examples (see the examples 6114 directory), demonstrating the client-server 6115 communication, using either CORBA Request or IDL-based 6116 stub (usually generated by a IDL to java compiler). These 6117 examples also show how to use the Classpath CORBA naming 6118 service. The IDL to java compiler is not yet written, but 6119 as our library must be compatible, it naturally accepts 6120 the output of other idlj implementations. 6121 + Misc 6122 o Updated TimeZone data against Olson tzdata2005l. 6123 o Make zip and jar packages UTF-8 clean. 6124 o "native" code builds and compiles (warning free) on 6125 Darwin and Solaris. 6126 o java.util.logging.FileHandler now rotates files. 6127 o Start of a generic JDWP framework in gnu/classpath/jdwp. 6128 This is unfinished, but feedback (at classpath (a] gnu.org) 6129 from runtime hackers is greatly appreciated. Although 6130 most of the work is currently being done around gcj/gij 6131 we want this framework to be as VM neutral as possible. 6132 Early design is described in: 6133 [3]https://gcc.gnu.org/ml/java/2005-05/msg00260.html 6134 o QT4 AWT peers, enable by giving configure 6135 --enable-qt-peer. Included, but not ready for production 6136 yet. They are explicitly disabled and not supported. But 6137 if you want to help with the development of these new 6138 features we are interested in feedback. You will have to 6139 explicitly enable them to try them out (and they will 6140 most likely contain bugs). 6141 o Documentation fixes all over the place. See 6142 [4]http://developer.classpath.org/doc/ 6143 6144 New Targets and Target Specific Improvements 6145 6146 IA-32/x86-64 6147 6148 * The x86-64 medium model (that allows building applications whose 6149 data segment exceeds 4GB) was redesigned to match latest ABI draft. 6150 New implementation split large datastructures into separate segment 6151 improving performance of accesses to small datastructures and also 6152 allows linking of small model libraries into medium model programs 6153 as long as the libraries are not accessing the large datastructures 6154 directly. Medium model is also supported in position independent 6155 code now. 6156 The ABI change results in partial incompatibility among medium 6157 model objects. Linking medium model libraries (or objects) compiled 6158 with new compiler into medium model program compiled with older 6159 will likely result in exceeding ranges of relocations. 6160 Binutils 2.16.91 or newer are required for compiling medium model 6161 now. 6162 6163 RS6000 (POWER/PowerPC) 6164 6165 * The AltiVec vector primitives in <altivec.h> are now implemented in 6166 a way that puts a smaller burden on the preprocessor, instead 6167 processing the "overloading" in the front ends. This should benefit 6168 compilation speed on AltiVec vector code. 6169 * AltiVec initializers now are generated more efficiently. 6170 * The popcountb instruction available on POWER5 now is generated. 6171 * The floating point round to integer instructions available on 6172 POWER5+ now is generated. 6173 * Floating point divides can be synthesized using the floating point 6174 reciprocal estimate instructions. 6175 * Double precision floating point constants are initialized as single 6176 precision values if they can be represented exactly. 6177 6178 S/390, zSeries and System z9 6179 6180 * Support for the IBM System z9 109 processor has been added. When 6181 using the -march=z9-109 option, the compiler will generate code 6182 making use of instructions provided by the extended immediate 6183 facility. 6184 * Support for 128-bit IEEE floating point has been added. When using 6185 the -mlong-double-128 option, the compiler will map the long double 6186 data type to 128-bit IEEE floating point. Using this option 6187 constitutes an ABI change, and requires glibc support. 6188 * Various changes to improve performance of generated code have been 6189 implemented, including: 6190 + In functions that do not require a literal pool, register %r13 6191 (which is traditionally reserved as literal pool pointer), can 6192 now be freely used for other purposes by the compiler. 6193 + More precise tracking of register use allows the compiler to 6194 generate more efficient function prolog and epilog code in 6195 certain cases. 6196 + The SEARCH STRING, COMPARE LOGICAL STRING, and MOVE STRING 6197 instructions are now used to implement C string functions. 6198 + The MOVE CHARACTER instruction with single byte overlap is now 6199 used to implement the memset function with non-zero fill byte. 6200 + The LOAD ZERO instructions are now used where appropriate. 6201 + The INSERT CHARACTERS UNDER MASK, STORE CHARACTERS UNDER MASK, 6202 and INSERT IMMEDIATE instructions are now used more frequently 6203 to optimize bitfield operations. 6204 + The BRANCH ON COUNT instruction is now used more frequently. 6205 In particular, the fact that a loop contains a subroutine call 6206 no longer prevents the compiler from using this instruction. 6207 + The compiler is now aware that all shift and rotate 6208 instructions implicitly truncate the shift count to six bits. 6209 * Back-end support for the following generic features has been 6210 implemented: 6211 + The full set of [5]built-in functions for atomic memory 6212 access. 6213 + The -fstack-protector feature. 6214 + The optimization pass avoiding unnecessary stores of incoming 6215 argument registers in functions with variable argument list. 6216 6217 SPARC 6218 6219 * The default code model in 64-bit mode has been changed from 6220 Medium/Anywhere to Medium/Middle on Solaris. 6221 * TLS support is disabled by default on Solaris prior to release 10. 6222 It can be enabled on TLS-capable Solaris 9 versions (4/04 release 6223 and later) by specifying --enable-tls at configure time. 6224 6225 MorphoSys 6226 6227 * Support has been added for this new architecture. 6228 6229 Obsolete Systems 6230 6231 Documentation improvements 6232 6233 Other significant improvements 6234 6235 * GCC can now emit code for protecting applications from 6236 stack-smashing attacks. The protection is realized by buffer 6237 overflow detection and reordering of stack variables to avoid 6238 pointer corruption. 6239 * Some built-in functions have been fortified to protect them against 6240 various buffer overflow (and format string) vulnerabilities. 6241 Compared to the mudflap bounds checking feature, the safe builtins 6242 have far smaller overhead. This means that programs built using 6243 safe builtins should not experience any measurable slowdown. 6244 6245 GCC 4.1.2 6246 6247 This is the [6]list of problem reports (PRs) from GCC's bug tracking 6248 system that are known to be fixed in the 4.1.2 release. This list might 6249 not be complete (that is, it is possible that some PRs that have been 6250 fixed are not listed here). 6251 6252 When generating code for a shared library, GCC now recognizes that 6253 global functions may be replaced when the program runs. Therefore, it 6254 is now more conservative in deducing information from the bodies of 6255 functions. For example, in this example: 6256 void f() {} 6257 void g() { 6258 try { f(); } 6259 catch (...) { 6260 cout << "Exception"; 6261 } 6262 } 6263 6264 G++ would previously have optimized away the catch clause, since it 6265 would have concluded that f cannot throw exceptions. Because users may 6266 replace f with another function in the main body of the program, this 6267 optimization is unsafe, and is no longer performed. If you wish G++ to 6268 continue to optimize as before, you must add a throw() clause to the 6269 declaration of f to make clear that it does not throw exceptions. 6270 6271 6272 For questions related to the use of GCC, please consult these web 6273 pages and the [7]GCC manuals. If that fails, the 6274 [8]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6275 web pages and the development of GCC are welcome on our developer 6276 list at [9]gcc (a] gcc.gnu.org. All of [10]our lists have public 6277 archives. 6278 6279 Copyright (C) [11]Free Software Foundation, Inc. Verbatim copying and 6280 distribution of this entire article is permitted in any medium, 6281 provided this notice is preserved. 6282 6283 These pages are [12]maintained by the GCC team. Last modified 6284 2014-06-28[13]. 6285 6286 References 6287 6288 1. http://gcc.gnu.org/gcc-4.1/changes.html#4.1.2 6289 2. http://developer.classpath.org/mediation/ClasspathGraphicsImagesText 6290 3. https://gcc.gnu.org/ml/java/2005-05/msg00260.html 6291 4. http://developer.classpath.org/doc/ 6292 5. https://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html 6293 6. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.1.2 6294 7. https://gcc.gnu.org/onlinedocs/ 6295 8. mailto:gcc-help (a] gcc.gnu.org 6296 9. mailto:gcc (a] gcc.gnu.org 6297 10. https://gcc.gnu.org/lists.html 6298 11. http://www.fsf.org/ 6299 12. https://gcc.gnu.org/about.html 6300 13. http://validator.w3.org/check/referer 6301 ====================================================================== 6302 http://gcc.gnu.org/gcc-4.0/index.html 6303 6304 GCC 4.0 Release Series 6305 6306 January 31, 2007 6307 6308 The [1]GNU project and the GCC developers are pleased to announce the 6309 release of GCC 4.0.4. 6310 6311 This release is a bug-fix release, containing fixes for regressions in 6312 GCC 4.0.3 relative to previous releases of GCC. 6313 6314 Release History 6315 6316 GCC 4.0.4 6317 January 31, 2007 ([2]changes) 6318 6319 GCC 4.0.3 6320 March 10, 2006 ([3]changes) 6321 6322 GCC 4.0.2 6323 September 28, 2005 ([4]changes) 6324 6325 GCC 4.0.1 6326 July 7, 2005 ([5]changes) 6327 6328 GCC 4.0.0 6329 April 20, 2005 ([6]changes) 6330 6331 References and Acknowledgements 6332 6333 GCC used to stand for the GNU C Compiler, but since the compiler 6334 supports several other languages aside from C, it now stands for the 6335 GNU Compiler Collection. 6336 6337 A list of [7]successful builds is updated as new information becomes 6338 available. 6339 6340 The GCC developers would like to thank the numerous people that have 6341 contributed new features, improvements, bug fixes, and other changes as 6342 well as test results to GCC. This [8]amazing group of volunteers is 6343 what makes GCC successful. 6344 6345 For additional information about GCC please refer to the [9]GCC project 6346 web site or contact the [10]GCC development mailing list. 6347 6348 To obtain GCC please use [11]our mirror sites, or [12]our SVN server. 6349 6350 6351 For questions related to the use of GCC, please consult these web 6352 pages and the [13]GCC manuals. If that fails, the 6353 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6354 web pages and the development of GCC are welcome on our developer 6355 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 6356 archives. 6357 6358 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 6359 distribution of this entire article is permitted in any medium, 6360 provided this notice is preserved. 6361 6362 These pages are [18]maintained by the GCC team. Last modified 6363 2014-06-28[19]. 6364 6365 References 6366 6367 1. http://www.gnu.org/ 6368 2. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.4 6369 3. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.3 6370 4. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.2 6371 5. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.1 6372 6. http://gcc.gnu.org/gcc-4.0/changes.html 6373 7. http://gcc.gnu.org/gcc-4.0/buildstat.html 6374 8. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 6375 9. http://gcc.gnu.org/index.html 6376 10. mailto:gcc (a] gcc.gnu.org 6377 11. http://gcc.gnu.org/mirrors.html 6378 12. http://gcc.gnu.org/svn.html 6379 13. https://gcc.gnu.org/onlinedocs/ 6380 14. mailto:gcc-help (a] gcc.gnu.org 6381 15. mailto:gcc (a] gcc.gnu.org 6382 16. https://gcc.gnu.org/lists.html 6383 17. http://www.fsf.org/ 6384 18. https://gcc.gnu.org/about.html 6385 19. http://validator.w3.org/check/referer 6386 ====================================================================== 6387 http://gcc.gnu.org/gcc-4.0/changes.html 6388 6389 GCC 4.0 Release Series 6390 Changes, New Features, and Fixes 6391 6392 The latest release in the 4.0 release series is [1]GCC 4.0.4. 6393 6394 Caveats 6395 6396 * GCC now generates location lists by default when compiling with 6397 debug info and optimization. 6398 + GDB 6.0 and older crashes when it sees location lists. GDB 6.1 6399 or later is needed to debug binaries containing location 6400 lists. 6401 + When you are trying to view a value of a variable in a part of 6402 a function where it has no location (for example when the 6403 variable is no longer used and thus its location was used for 6404 something else) GDB will say that it is not available. 6405 You can disable generating location lists by -fno-var-tracking. 6406 * GCC no longer accepts the -fwritable-strings option. Use named 6407 character arrays when you need a writable string. 6408 * The options -freduce-all-givs and -fmove-all-movables have been 6409 discontinued. They were used to circumvent a shortcoming in the 6410 heuristics of the old loop optimization code with respect to common 6411 Fortran constructs. The new (tree) loop optimizer works differently 6412 and doesn't need those work-arounds. 6413 * The graph-coloring register allocator, formerly enabled by the 6414 option -fnew-ra, has been discontinued. 6415 * -I- has been deprecated. -iquote is meant to replace the need for 6416 this option. 6417 * The MIPS -membedded-pic and -mrnames options have been removed. 6418 * All MIPS targets now require the GNU assembler. In particular, IRIX 6419 configurations can no longer use the MIPSpro assemblers, although 6420 they do still support the MIPSpro linkers. 6421 * The SPARC option -mflat has been removed. 6422 * English-language diagnostic messages will now use Unicode quotation 6423 marks in UTF-8 locales. (Non-English messages already used the 6424 quotes appropriate for the language in previous releases.) If your 6425 terminal does not support UTF-8 but you are using a UTF-8 locale 6426 (such locales are the default on many GNU/Linux systems) then you 6427 should set LC_CTYPE=C in the environment to disable that locale. 6428 Programs that parse diagnostics and expect plain ASCII 6429 English-language messages should set LC_ALL=C. See [2]Markus Kuhn's 6430 explanation of Unicode quotation marks for more information. 6431 * The specs file is no longer installed on most platforms. Most users 6432 will be totally unaffected. However, if you are accustomed to 6433 editing the specs file yourself, you will now have to use the 6434 -dumpspecs option to generate the specs file, and then edit the 6435 resulting file. 6436 6437 General Optimizer Improvements 6438 6439 * The [3]tree ssa branch has been merged. This merge has brought in a 6440 completely new optimization framework based on a higher level 6441 intermediate representation than the existing RTL representation. 6442 Numerous new code transformations based on the new framework are 6443 available in GCC 4.0, including: 6444 + Scalar replacement of aggregates 6445 + Constant propagation 6446 + Value range propagation 6447 + Partial redundancy elimination 6448 + Load and store motion 6449 + Strength reduction 6450 + Dead store elimination 6451 + Dead and unreachable code elimination 6452 + [4]Autovectorization 6453 + Loop interchange 6454 + Tail recursion by accumulation 6455 Many of these passes outperform their counterparts from previous 6456 GCC releases. 6457 * [5]Swing Modulo Scheduling (SMS). An RTL level instruction 6458 scheduling optimization intended for loops that perform heavy 6459 computations. 6460 6461 New Languages and Language specific improvements 6462 6463 C family 6464 6465 * The sentinel attribute has been added to GCC. This function 6466 attribute allows GCC to warn when variadic functions such as execl 6467 are not NULL terminated. See the GCC manual for a complete 6468 description of its behavior. 6469 * Given __attribute__((alias("target"))) it is now an error if target 6470 is not a symbol, defined in the same translation unit. This also 6471 applies to aliases created by #pragma weak alias=target. This is 6472 because it's meaningless to define an alias to an undefined symbol. 6473 On Solaris, the native assembler would have caught this error, but 6474 GNU as does not. 6475 6476 C and Objective-C 6477 6478 * The -Wstrict-aliasing=2 option has been added. This warning catches 6479 all unsafe cases, but it may also give a warning for some cases 6480 that are safe. 6481 * The cast-as-lvalue, conditional-expression-as-lvalue and 6482 compound-expression-as-lvalue extensions, which were deprecated in 6483 3.3.4 and 3.4, have been removed. 6484 * The -fwritable-strings option, which was deprecated in 3.4, has 6485 been removed. 6486 * #pragma pack() semantics have been brought closer to those used by 6487 other compilers. This also applies to C++. 6488 * Taking the address of a variable with register storage is invalid 6489 in C. GCC now issues an error instead of a warning. 6490 * Arrays of incomplete element type are invalid in C. GCC now issues 6491 an error for such arrays. Declarations such as extern struct s x[]; 6492 (where struct s has not been defined) can be moved after the 6493 definition of struct s. Function parameters declared as arrays of 6494 incomplete type can instead be declared as pointers. 6495 6496 C++ 6497 6498 * When compiling without optimizations (-O0), the C++ frontend is 6499 much faster than in any previous versions of GCC. Independent 6500 testers have measured speed-ups up to 25% in real-world production 6501 code, compared to the 3.4 family (which was already the fastest 6502 version to date). Upgrading from older versions might show even 6503 bigger improvements. 6504 * ELF visibility attributes can now be applied to a class type, so 6505 that it affects every member function of a class at once, without 6506 having to specify each individually: 6507 class __attribute__ ((visibility("hidden"))) Foo 6508 { 6509 int foo1(); 6510 void foo2(); 6511 }; 6512 The syntax is deliberately similar to the __declspec() system used 6513 by Microsoft Windows based compilers, allowing cross-platform 6514 projects to easily reuse their existing macro system for denoting 6515 exports and imports. By explicitly marking internal classes never 6516 used outside a binary as hidden, one can completely avoid PLT 6517 indirection overheads during their usage by the compiler. You can 6518 find out more about the advantages of this at 6519 [6]http://www.akkadia.org/drepper/dsohowto.pdf 6520 * The -fvisibility-inlines-hidden option has been added which marks 6521 all inlineable functions as having hidden ELF visibility, thus 6522 removing their symbol and typeinfo from the exported symbol table 6523 of the output ELF binary. Using this option can reduce the exported 6524 symbol count of template-heavy code by up to 40% with no code 6525 change at all, thus notably improving link and load times for the 6526 binary as well as a reduction in size of up to 10%. Also, check the 6527 new [7]-fvisibility option. 6528 * The compiler now uses the library interface specified by the [8]C++ 6529 ABI for thread-safe initialization of function-scope static 6530 variables. Most users should leave this alone, but embedded 6531 programmers may want to disable this by specifying 6532 -fno-threadsafe-statics for a small savings in code size. 6533 * Taking the address of an explicit register variable is no longer 6534 supported. Note that C++ allows taking the address of variables 6535 with register storage so this will continue to compile with a 6536 warning. For example, assuming that r0 is a machine register: 6537 register int foo asm ("r0"); 6538 register int bar; 6539 &foo; // error, no longer accepted 6540 &bar; // OK, with a warning 6541 * G++ has an undocumented extension to virtual function covariancy 6542 rules that allowed the overrider to return a type that was 6543 implicitly convertable to the overridden function's return type. 6544 For instance a function returning void * could be overridden by a 6545 function returning T *. This is now deprecated and will be removed 6546 in a future release. 6547 * The G++ minimum and maximum operators (<? and >?) and their 6548 compound forms (<?=) and >?=) have been deprecated and will be 6549 removed in a future version. Code using these operators should be 6550 modified to use std::min and std::max instead. 6551 * Declaration of nested classes of class templates as friends are 6552 supported: 6553 template <typename T> struct A { 6554 class B {}; 6555 }; 6556 class C { 6557 template <typename T> friend class A<T>::B; 6558 }; 6559 This complements the feature member functions of class templates as 6560 friends introduced in GCC 3.4.0. 6561 * When declaring a friend class using an unqualified name, classes 6562 outside the innermost non-class scope are not searched: 6563 class A; 6564 namespace N { 6565 class B { 6566 friend class A; // Refer to N::A which has not been declared yet 6567 // because name outside namespace N are not searched 6568 friend class ::A; // Refer to ::A 6569 }; 6570 } 6571 Hiding the friend name until declaration is still not implemented. 6572 * Friends of classes defined outside their namespace are correctly 6573 handled: 6574 namespace N { 6575 class A; 6576 } 6577 class N::A { 6578 friend class B; // Refer to N::B in GCC 4.0.0 6579 // but ::B in earlier versions of GCC 6580 }; 6581 6582 Runtime Library (libstdc++) 6583 6584 * Optimization work: 6585 + Added efficient specializations of istream functions for char 6586 and wchar_t. 6587 + Further performance tuning of strings, in particular wrt 6588 single-char append and getline. 6589 + iter_swap - and therefore most of the mutating algorithms - 6590 now makes an unqualified call to swap when the value_type of 6591 the two iterators is the same. 6592 * A large subset of the features in Technical Report 1 (TR1 for 6593 short) is experimentally delivered (i.e., no guarantees about the 6594 implementation are provided. In particular it is not promised that 6595 the library will remain link-compatible when code using TR1 is 6596 used): 6597 + General utilities such as reference_wrapper and shared_ptr. 6598 + Function objects, i.e., result_of, mem_fn, bind, function. 6599 + Support for metaprogramming. 6600 + New containers such as tuple, array, unordered_set, 6601 unordered_map, unordered_multiset, unordered_multimap. 6602 * As usual, many bugs have been fixed and LWG resolutions implemented 6603 for the first time (e.g., DR 409). 6604 6605 Java 6606 6607 * In order to prevent naming conflicts with other implementations of 6608 these tools, some GCJ binaries have been renamed: 6609 + rmic is now grmic, 6610 + rmiregistry is now grmiregistry, and 6611 + jar is now fastjar. 6612 In particular, these names were problematic for the jpackage.org 6613 packaging conventions which install symlinks in /usr/bin that point 6614 to the preferred versions of these tools. 6615 * The -findirect-dispatch argument to the compiler now works and 6616 generates code following a new "binary compatibility" ABI. Code 6617 compiled this way follows the binary compatibility rules of the 6618 Java Language Specification. 6619 * libgcj now has support for using GCJ as a JIT, using the 6620 gnu.gcj.jit family of system properties. 6621 * libgcj can now find a shared library corresponding to the bytecode 6622 representation of a class. See the documentation for the new 6623 gcj-dbtool program, and the new gnu.gcj.precompiled.db.path system 6624 property. 6625 * There have been many improvements to the class library. Here are 6626 some highlights: 6627 + Much more of AWT and Swing exist. 6628 + Many new packages and classes were added, including 6629 java.util.regex, java.net.URI, javax.crypto, 6630 javax.crypto.interfaces, javax.crypto.spec, javax.net, 6631 javax.net.ssl, javax.security.auth, 6632 javax.security.auth.callback, javax.security.auth.login, 6633 javax.security.auth.x500, javax.security.sasl, org.ietf.jgss, 6634 javax.imageio, javax.imageio.event, javax.imageio.spi, 6635 javax.print, javax.print.attribute, 6636 javax.print.attribute.standard, javax.print.event, and 6637 javax.xml 6638 + Updated SAX and DOM, and imported GNU JAXP 6639 6640 Fortran 6641 6642 * A new [9]Fortran front end has replaced the aging GNU Fortran 77 6643 front end. The new front end supports Fortran 90 and Fortran 95. It 6644 may not yet be as stable as the old Fortran front end. 6645 6646 Ada 6647 6648 * Ada (with tasking and Zero Cost Exceptions) is now available on 6649 many more targets, including but not limited to: alpha-linux, 6650 hppa-hpux, hppa-linux, powerpc-darwin, powerpc-linux, s390-linux, 6651 s390x-linux, sparc-linux. 6652 * Some of the new Ada 2005 features are now implemented like 6653 Wide_Wide_Character and Ada.Containers. 6654 * Many bugs have been fixed, tools and documentation improved. 6655 * To compile Ada from the sources, install an older working Ada 6656 compiler and then use --enable-languages=ada at configuration time, 6657 since the Ada frontend is not currently activated by default. See 6658 the [10]Installing GCC for details. 6659 6660 New Targets and Target Specific Improvements 6661 6662 H8/300 6663 6664 * The frame layout has changed. In the new layout, the prologue of a 6665 function first saves registers and then allocate space for locals, 6666 resulting in an 1% improvement on code size. 6667 6668 IA-32/x86-64 (AMD64) 6669 6670 * The acos, asin, drem, exp10, exp2, expm1, fmod, ilogb, log10, 6671 log1p, log2, logb and tan mathematical builtins (and their float 6672 and long double variants) are now implemented as inline x87 6673 intrinsics when using -ffast-math. 6674 * The ceil, floor, nearbyint, rint and trunc mathematical builtins 6675 (and their float and long double variants) are now implemented as 6676 inline x87 intrinsics when using -ffast-math. 6677 * The x87's fsincos instruction is now used automatically with 6678 -ffast-math when calculating both the sin and cos of the same 6679 argument. 6680 * Instruction selection for multiplication and division by constants 6681 has been improved. 6682 6683 IA-64 6684 6685 * Floating point division, integer division and sqrt are now inlined, 6686 resulting in significant performance improvements on some codes. 6687 6688 MIPS 6689 6690 * Division by zero checks now use conditional traps if the target 6691 processor supports them. This decreases code size by one word per 6692 division operation. The old behavior (branch and break) can be 6693 obtained either at configure time by passing --with-divide=breaks 6694 to configure or at runtime by passing -mdivide-breaks to GCC. 6695 * Support for MIPS64 paired-single instructions has been added. It is 6696 enabled by -mpaired-single and can be accessed using both the 6697 target-independent vector extensions and new MIPS-specific built-in 6698 functions. 6699 * Support for the MIPS-3D ASE has been added. It is enabled by 6700 -mips3d and provides new MIPS-3D-specific built-in functions. 6701 * The -mexplicit-relocs option now supports static n64 code (as is 6702 used, for example, in 64-bit linux kernels). -mexplicit-relocs 6703 should now be feature-complete and is enabled by default when GCC 6704 is configured to use a compatible assembler. 6705 * Support for the NEC VR4130 series has been added. This support 6706 includes the use of VR-specific instructions and a new VR4130 6707 scheduler. Full VR4130 support can be selected with -march=vr4130 6708 while code for any ISA can be tuned for the VR4130 using 6709 -mtune=vr4130. There is also a new -mvr4130-align option that 6710 produces better schedules at the cost of increased code size. 6711 * Support for the Broadcom SB-1 has been extended. There is now an 6712 SB-1 scheduler as well as support for the SB-1-specific 6713 paired-single instructions. Full SB-1 support can be selected with 6714 -march=sb1 while code for any ISA can be optimized for the SB-1 6715 using -mtune=sb1. 6716 * The compiler can now work around errata in R4000, R4400, VR4120 and 6717 VR4130 processors. These workarounds are enabled by -mfix-r4000, 6718 -mfix-r4400, -mfix-vr4120 and -mfix-vr4130 respectively. The VR4120 6719 and VR4130 workarounds need binutils 2.16 or above. 6720 * IRIX shared libraries are now installed into the standard library 6721 directories: o32 libraries go into lib/, n32 libraries go into 6722 lib32/ and n64 libraries go into lib64/. 6723 * The compiler supports a new -msym32 option. It can be used to 6724 optimize n64 code in which all symbols are known to have 32-bit 6725 values. 6726 6727 S/390 and zSeries 6728 6729 * New command-line options help to generate code intended to run in 6730 an environment where stack space is restricted, e.g. Linux kernel 6731 code: 6732 + -mwarn-framesize and -mwarn-dynamicstack trigger compile-time 6733 warnings for single functions that require large or dynamic 6734 stack frames. 6735 + -mstack-size and -mstack-guard generate code that checks for 6736 stack overflow at run time. 6737 + -mpacked-stack generates code that reduces the stack frame 6738 size of many functions by reusing unneeded parts of the stack 6739 bias area. 6740 * The -msoft-float option now ensures that generated code never 6741 accesses floating point registers. 6742 * The s390x-ibm-tpf target now fully supports C++, including 6743 exceptions and threads. 6744 * Various changes to improve performance of the generated code have 6745 been implemented, including: 6746 + GCC now uses sibling calls where possible. 6747 + Condition code handling has been optimized, allowing GCC to 6748 omit redundant comparisons in certain cases. 6749 + The cost function guiding many optimizations has been refined 6750 to more accurately represent the z900 and z990 processors. 6751 + The ADD LOGICAL WITH CARRY and SUBTRACT LOGICAL WITH BORROW 6752 instructions are now used to avoid conditional branches in 6753 certain cases. 6754 + The back end now uses the LEGITIMIZE_RELOAD_ADDRESS feature to 6755 optimize address arithmetic required to access large stack 6756 frames. 6757 + GCC now makes more efficient use of memory-to-memory type 6758 instructions (MVC, CLC, ...). 6759 + More precise tracking of special register use allows better 6760 instruction scheduling, in particular of the function prologue 6761 and epilogue sequences. 6762 + The Java front end now generates inline code to implement 6763 integer division, instead of calling library routines. 6764 6765 SPARC 6766 6767 * The options -mv8, -msparclite, -mcypress, -msupersparc, -mf930 and 6768 -mf934 have been removed. They have been replaced with -mcpu=xxx. 6769 * The internal model used to estimate the relative cost of each 6770 instruction has been updated. It is expected to give better results 6771 on recent UltraSPARC processors. 6772 * Code generation for function prologues and epilogues has been 6773 improved, resulting in better scheduling and allowing multiple exit 6774 points in functions. 6775 * Support for Sun's Visual Instruction Set (VIS) has been enhanced. 6776 It is enabled by -mvis and provides new built-in functions for VIS 6777 instructions on UltraSPARC processors. 6778 * The option -mapp-regs has been turned on by default on Solaris too. 6779 6780 NetWare 6781 6782 * Novell NetWare (on ix86, no other hardware platform was ever really 6783 supported by this OS) has been re-enabled and the ABI supported by 6784 GCC has been brought into sync with that of MetroWerks CodeWarrior 6785 (the ABI previously supported was that of some Unix systems, which 6786 NetWare never tried to support). 6787 6788 Obsolete Systems 6789 6790 Support for a number of older systems has been declared obsolete in GCC 6791 4.0. Unless there is activity to revive them, the next release of GCC 6792 will have their sources permanently removed. 6793 6794 All GCC ports for the following processor architectures have been 6795 declared obsolete: 6796 * Intel i860 6797 * Ubicom IP2022 6798 * National Semiconductor NS32K 6799 * Texas Instruments TMS320C[34]x 6800 6801 Also, those for some individual systems have been obsoleted: 6802 * SPARC family 6803 + SPARClite-based systems (sparclite-*-coff, sparclite-*-elf, 6804 sparc86x-*-elf) 6805 + OpenBSD 32-bit (sparc-*-openbsd*) 6806 6807 Documentation improvements 6808 6809 Other significant improvements 6810 6811 * Location lists are now generated by default when compiling with 6812 debug info and optimization. Location lists provide more accurate 6813 debug info about locations of variables and they allow debugging 6814 code compiled with -fomit-frame-pointer. 6815 * The -fvisibility option has been added which allows the default ELF 6816 visibility of all symbols to be set per compilation and the new 6817 #pragma GCC visibility preprocessor command allows the setting of 6818 default ELF visibility for a region of code. Using 6819 -fvisibility=hidden especially in combination with the new 6820 -fvisibility-inlines-hidden can yield substantial improvements in 6821 output binary quality including avoiding PLT indirection overheads, 6822 reduction of the exported symbol count by up to 60% (with resultant 6823 improvements to link and load times), better scope for the 6824 optimizer to improve code and up to a 20% reduction in binary size. 6825 Using these options correctly yields a binary with a similar symbol 6826 count to a Windows DLL. 6827 Perhaps more importantly, this new feature finally allows (with 6828 careful planning) complete avoidance of symbol clashes when 6829 manually loading shared objects with RTLD_GLOBAL, thus finally 6830 solving problems many projects such as python were forced to use 6831 RTLD_LOCAL for (with its resulting issues for C++ correctness). You 6832 can find more information about using these options at 6833 [11]https://gcc.gnu.org/wiki/Visibility. 6834 __________________________________________________________________ 6835 6836 GCC 4.0.1 6837 6838 This is the [12]list of problem reports (PRs) from GCC's bug tracking 6839 system that are known to be fixed in the 4.0.1 release. This list might 6840 not be complete (that is, it is possible that some PRs that have been 6841 fixed are not listed here). 6842 6843 GCC 4.0.2 6844 6845 This is the [13]list of problem reports (PRs) from GCC's bug tracking 6846 system that are known to be fixed in the 4.0.2 release. This list might 6847 not be complete (that is, it is possible that some PRs that have been 6848 fixed are not listed here). 6849 6850 Unfortunately, due to a release engineering failure, this release has a 6851 regression on Solaris that will affect some C++ programs. We suggest 6852 that Solaris users apply a [14]patch that corrects the problem. Users 6853 who do not wish to apply the patch should explicitly link C++ programs 6854 with the -pthreads option, even if they do not use threads. This 6855 problem has been corrected in the current 4.0 branch sources and will 6856 not be present in GCC 4.0.3. 6857 6858 GCC 4.0.3 6859 6860 Starting with this release, the function getcontext is recognized by 6861 the compiler as having the same semantics as the setjmp function. In 6862 particular, the compiler will ensure that all registers are dead before 6863 calling such a function and will emit a warning about the variables 6864 that may be clobbered after the second return from the function. 6865 6866 GCC 4.0.4 6867 6868 This is the [15]list of problem reports (PRs) from GCC's bug tracking 6869 system that are known to be fixed in the 4.0.4 release. This list might 6870 not be complete (that is, it is possible that some PRs that have been 6871 fixed are not listed here). 6872 6873 The 4.0.4 release is provided for those that require a high degree of 6874 binary compatibility with previous 4.0.x releases. For most users, the 6875 GCC team recommends that version 4.1.1 or later be used instead." 6876 6877 6878 For questions related to the use of GCC, please consult these web 6879 pages and the [16]GCC manuals. If that fails, the 6880 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6881 web pages and the development of GCC are welcome on our developer 6882 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 6883 archives. 6884 6885 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 6886 distribution of this entire article is permitted in any medium, 6887 provided this notice is preserved. 6888 6889 These pages are [21]maintained by the GCC team. Last modified 6890 2014-06-28[22]. 6891 6892 References 6893 6894 1. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.4 6895 2. http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html 6896 3. http://gcc.gnu.org/projects/tree-ssa/ 6897 4. http://gcc.gnu.org/projects/tree-ssa/vectorization.html 6898 5. http://gcc.gnu.org/news/sms.html 6899 6. http://www.akkadia.org/drepper/dsohowto.pdf 6900 7. http://gcc.gnu.org/gcc-4.0/changes.html#visibility 6901 8. http://mentorembedded.github.com/cxx-abi/ 6902 9. http://gcc.gnu.org/fortran/ 6903 10. https://gcc.gnu.org/install/ 6904 11. https://gcc.gnu.org/wiki/Visibility 6905 12. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.1 6906 13. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.2 6907 14. https://gcc.gnu.org/ml/gcc-cvs/2005-09/msg00984.html 6908 15. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.4 6909 16. https://gcc.gnu.org/onlinedocs/ 6910 17. mailto:gcc-help (a] gcc.gnu.org 6911 18. mailto:gcc (a] gcc.gnu.org 6912 19. https://gcc.gnu.org/lists.html 6913 20. http://www.fsf.org/ 6914 21. https://gcc.gnu.org/about.html 6915 22. http://validator.w3.org/check/referer 6916 ====================================================================== 6917 http://gcc.gnu.org/gcc-3.4/index.html 6918 6919 GCC 3.4 Release Series 6920 6921 May 26, 2006 6922 6923 The [1]GNU project and the GCC developers are pleased to announce the 6924 release of GCC 3.4.6. 6925 6926 This release is a bug-fix release, containing fixes for regressions in 6927 GCC 3.4.4 relative to previous releases of GCC. This is the last of the 6928 3.4.x series. 6929 6930 The GCC 3.4 release series includes numerous [2]new features, 6931 improvements, bug fixes, and other changes, thanks to an [3]amazing 6932 group of volunteers. 6933 6934 Release History 6935 6936 GCC 3.4.6 6937 March 6, 2006 ([4]changes) 6938 6939 GCC 3.4.5 6940 November 30, 2005 ([5]changes) 6941 6942 GCC 3.4.4 6943 May 18, 2005 ([6]changes) 6944 6945 GCC 3.4.3 6946 November 4, 2004 ([7]changes) 6947 6948 GCC 3.4.2 6949 September 6, 2004 ([8]changes) 6950 6951 GCC 3.4.1 6952 July 1, 2004 ([9]changes) 6953 6954 GCC 3.4.0 6955 April 18, 2004 ([10]changes) 6956 6957 References and Acknowledgements 6958 6959 GCC used to stand for the GNU C Compiler, but since the compiler 6960 supports several other languages aside from C, it now stands for the 6961 GNU Compiler Collection. 6962 6963 A list of [11]successful builds is updated as new information becomes 6964 available. 6965 6966 The GCC developers would like to thank the numerous people that have 6967 contributed new features, improvements, bug fixes, and other changes as 6968 well as test results to GCC. This [12]amazing group of volunteers is 6969 what makes GCC successful. 6970 6971 For additional information about GCC please refer to the [13]GCC 6972 project web site or contact the [14]GCC development mailing list. 6973 6974 To obtain GCC please use [15]our mirror sites, or [16]our SVN server. 6975 6976 6977 For questions related to the use of GCC, please consult these web 6978 pages and the [17]GCC manuals. If that fails, the 6979 [18]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6980 web pages and the development of GCC are welcome on our developer 6981 list at [19]gcc (a] gcc.gnu.org. All of [20]our lists have public 6982 archives. 6983 6984 Copyright (C) [21]Free Software Foundation, Inc. Verbatim copying and 6985 distribution of this entire article is permitted in any medium, 6986 provided this notice is preserved. 6987 6988 These pages are [22]maintained by the GCC team. Last modified 6989 2014-06-28[23]. 6990 6991 References 6992 6993 1. http://www.gnu.org/ 6994 2. http://gcc.gnu.org/gcc-3.4/changes.html 6995 3. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 6996 4. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.6 6997 5. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.5 6998 6. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.4 6999 7. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.3 7000 8. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.2 7001 9. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.1 7002 10. http://gcc.gnu.org/gcc-3.4/changes.html 7003 11. http://gcc.gnu.org/gcc-3.4/buildstat.html 7004 12. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 7005 13. http://gcc.gnu.org/index.html 7006 14. mailto:gcc (a] gcc.gnu.org 7007 15. http://gcc.gnu.org/mirrors.html 7008 16. http://gcc.gnu.org/svn.html 7009 17. https://gcc.gnu.org/onlinedocs/ 7010 18. mailto:gcc-help (a] gcc.gnu.org 7011 19. mailto:gcc (a] gcc.gnu.org 7012 20. https://gcc.gnu.org/lists.html 7013 21. http://www.fsf.org/ 7014 22. https://gcc.gnu.org/about.html 7015 23. http://validator.w3.org/check/referer 7016 ====================================================================== 7017 http://gcc.gnu.org/gcc-3.4/changes.html 7018 7019 GCC 3.4 Release Series 7020 Changes, New Features, and Fixes 7021 7022 The final release in the 3.4 release series is [1]GCC 3.4.6. The series 7023 is now closed. 7024 7025 GCC 3.4 has [2]many improvements in the C++ frontend. Before reporting 7026 a bug, please make sure it's really GCC, and not your code, that is 7027 broken. 7028 7029 Caveats 7030 7031 * GNU Make is now required to build GCC. 7032 * With -nostdinc the preprocessor used to ignore both standard 7033 include paths and include paths contained in environment variables. 7034 It was neither documented nor intended that environment variable 7035 paths be ignored, so this has been corrected. 7036 * GCC no longer accepts the options -fvolatile, -fvolatile-global and 7037 -fvolatile-static. It is unlikely that they worked correctly in any 7038 3.x release. 7039 * GCC no longer ships <varargs.h>. Use <stdarg.h> instead. 7040 * Support for all the systems [3]obsoleted in GCC 3.3 has been 7041 removed from GCC 3.4. See below for a [4]list of systems which are 7042 obsoleted in this release. 7043 * GCC now requires an ISO C90 (ANSI C89) C compiler to build. K&R C 7044 compilers will not work. 7045 * The implementation of the [5]MIPS ABIs has changed. As a result, 7046 the code generated for certain MIPS targets will not be binary 7047 compatible with earlier releases. 7048 * In previous releases, the MIPS port had a fake "hilo" register with 7049 the user-visible name accum. This register has been removed. 7050 * The implementation of the [6]SPARC ABIs has changed. As a result, 7051 the code generated will not be binary compatible with earlier 7052 releases in certain cases. 7053 * The configure option --enable-threads=pthreads has been removed; 7054 use --enable-threads=posix instead, which should have the same 7055 effect. 7056 * Code size estimates used by inlining heuristics for C, Objective-C, 7057 C++ and Java have been redesigned significantly. As a result the 7058 parameters of -finline-insns, --param max-inline-insns-single and 7059 --param max-inline-insns-auto need to be reconsidered. 7060 * --param max-inline-slope and --param min-inline-insns have been 7061 removed; they are not needed for the new bottom-up inlining 7062 heuristics. 7063 * The new unit-at-a-time compilation scheme has several compatibility 7064 issues: 7065 + The order in which functions, variables, and top-level asm 7066 statements are emitted may have changed. Code relying on some 7067 particular ordering needs to be updated. The majority of such 7068 top-level asm statements can be replaced by section 7069 attributes. 7070 + Unreferenced static variables and functions are removed. This 7071 may result in undefined references when an asm statement 7072 refers to the variable/function directly. In that case either 7073 the variable/function shall be listed in asm statement operand 7074 or in the case of top-level asm statements the attribute used 7075 shall be used to force function/variable to be always output 7076 and considered as a possibly used by unknown code. 7077 For variables the attribute is accepted only by GCC 3.4 and 7078 newer, while for earlier versions it is sufficient to use 7079 unused to silence warnings about the variables not being 7080 referenced. To keep code portable across different GCC 7081 versions, you can use appropriate preprocessor conditionals. 7082 + Static functions now can use non-standard passing conventions 7083 that may break asm statements calling functions directly. 7084 Again the attribute used shall be used to prevent this 7085 behavior. 7086 As a temporary workaround, -fno-unit-at-a-time can be used, but 7087 this scheme may not be supported by future releases of GCC. 7088 * GCC 3.4 automatically places zero-initialized variables in the .bss 7089 section on some operating systems. Versions of GNU Emacs up to (and 7090 including) 21.3 will not work correctly when using this 7091 optimization; you can use -fno-zero-initialized-in-bss to disable 7092 it. 7093 * If GCC 3.4 is configured with --enable-threads=posix (the default 7094 on most targets that support pthreads) then _REENTRANT will be 7095 defined unconditionally by some libstdc++ headers. C++ code which 7096 relies on that macro to detect whether multi-threaded code is being 7097 compiled might change in meaning, possibly resulting in linker 7098 errors for single-threaded programs. Affected users of [7]Boost 7099 should compile single-threaded code with -DBOOST_DISABLE_THREADS. 7100 See Bugzilla for [8]more information. 7101 7102 General Optimizer Improvements 7103 7104 * Usability of the profile feedback and coverage testing has been 7105 improved. 7106 + Performance of profiled programs has been improved by faster 7107 profile merging code. 7108 + Better use of the profile feedback for optimization (loop 7109 unrolling and loop peeling). 7110 + File locking support allowing fork() calls and parallel runs 7111 of profiled programs. 7112 + Coverage file format has been redesigned. 7113 + gcov coverage tool has been improved. 7114 + make profiledbootstrap available to build a faster compiler. 7115 Experiments made on i386 hardware showed an 11% speedup on -O0 7116 and a 7.5% speedup on -O2 compilation of a [9]large C++ 7117 testcase. 7118 + New value profiling pass enabled via -fprofile-values 7119 + New value profile transformations pass enabled via -fvpt aims 7120 to optimize some code sequences by exploiting knowledge about 7121 value ranges or other properties of the operands. At the 7122 moment a conversion of expensive divisions into cheaper 7123 operations has been implemented. 7124 + New -fprofile-generate and -fprofile-use command-line options 7125 to simplify the use of profile feedback. 7126 * A new unit-at-a-time compilation scheme for C, Objective-C, C++ and 7127 Java which is enabled via -funit-at-a-time (and implied by -O2). In 7128 this scheme a whole file is parsed first and optimized later. The 7129 following basic inter-procedural optimizations are implemented: 7130 + Removal of unreachable functions and variables 7131 + Discovery of local functions (functions with static linkage 7132 whose address is never taken) 7133 + On i386, these local functions use register parameter passing 7134 conventions. 7135 + Reordering of functions in topological order of the call graph 7136 to enable better propagation of optimizing hints (such as the 7137 stack alignments needed by functions) in the back end. 7138 + Call graph based out-of-order inlining heuristics which allows 7139 to limit overall compilation unit growth (--param 7140 inline-unit-growth). 7141 Overall, the unit-at-a-time scheme produces a 1.3% improvement for 7142 the SPECint2000 benchmark on the i386 architecture (AMD Athlon 7143 CPU). 7144 * More realistic code size estimates used by inlining for C, 7145 Objective-C, C++ and Java. The growth of large functions can now be 7146 limited via --param large-function-insns and --param 7147 large-function-growth. 7148 * A new cfg-level loop optimizer pass replaces the old loop unrolling 7149 pass and adds two other loop transformations -- loop peeling and 7150 loop unswitching -- and also uses the profile feedback to limit 7151 code growth. (The three optimizations are enabled by 7152 -funroll-loops, -fpeel-loops and -funswitch-loops flags, 7153 respectively). 7154 The old loop unroller still can be enabled by -fold-unroll-loops 7155 and may produce better code in some cases, especially when the 7156 webizer optimization pass is not run. 7157 * A new web construction pass enabled via -fweb (and implied by -O3) 7158 improves the quality of register allocation, CSE, first scheduling 7159 pass and some other optimization passes by avoiding re-use of 7160 pseudo registers with non-overlapping live ranges. The pass almost 7161 always improves code quality but does make debugging difficult and 7162 thus is not enabled by default by -O2 7163 The pass is especially effective as cleanup after code duplication 7164 passes, such as the loop unroller or the tracer. 7165 * Experimental implementations of superblock or trace scheduling in 7166 the second scheduling pass can be enabled via 7167 -fsched2-use-superblocks and -fsched2-use-traces, respectively. 7168 7169 New Languages and Language specific improvements 7170 7171 Ada 7172 7173 * The Ada front end has been updated to include numerous bug fixes 7174 and enhancements. These include: 7175 + Improved project file support 7176 + Additional set of warnings about potential wrong code 7177 + Improved error messages 7178 + Improved code generation 7179 + Improved cross reference information 7180 + Improved inlining 7181 + Better run-time check elimination 7182 + Better error recovery 7183 + More efficient implementation of unbounded strings 7184 + Added features in GNAT.Sockets, GNAT.OS_Lib, GNAT.Debug_Pools, 7185 ... 7186 + New GNAT.xxxx packages (e.g. GNAT.Strings, 7187 GNAT.Exception_Action) 7188 + New pragmas 7189 + New -gnatS switch replacing gnatpsta 7190 + Implementation of new Ada features (in particular limited 7191 with, limited aggregates) 7192 7193 C/Objective-C/C++ 7194 7195 * Precompiled headers are now supported. Precompiled headers can 7196 dramatically speed up compilation of some projects. There are some 7197 known defects in the current precompiled header implementation that 7198 will result in compiler crashes in relatively rare situations. 7199 Therefore, precompiled headers should be considered a "technology 7200 preview" in this release. Read the manual for details about how to 7201 use precompiled headers. 7202 * File handling in the preprocessor has been rewritten. GCC no longer 7203 gets confused by symlinks and hardlinks, and now has a correct 7204 implementation of #import and #pragma once. These two directives 7205 have therefore been un-deprecated. 7206 * The undocumented extension that allowed C programs to have a label 7207 at the end of a compound statement, which has been deprecated since 7208 GCC 3.0, has been removed. 7209 * The cast-as-lvalue extension has been removed for C++ and 7210 deprecated for C and Objective-C. In particular, code like this: 7211 int i; 7212 (char) i = 5; 7213 7214 or this: 7215 char *p; 7216 ((int *) p)++; 7217 7218 is no longer accepted for C++ and will not be accepted for C and 7219 Objective-C in a future version. 7220 * The conditional-expression-as-lvalue extension has been deprecated 7221 for C and Objective-C. In particular, code like this: 7222 int a, b, c; 7223 (a ? b : c) = 2; 7224 7225 will not be accepted for C and Objective-C in a future version. 7226 * The compound-expression-as-lvalue extension has been deprecated for 7227 C and Objective-C. In particular, code like this: 7228 int a, b; 7229 (a, b) = 2; 7230 7231 will not be accepted for C and Objective-C in a future version. A 7232 possible non-intrusive workaround is the following: 7233 (*(a, &b)) = 2; 7234 7235 * Several [10]built-in functions such as __builtin_popcount for 7236 counting bits, finding the highest and lowest bit in a word, and 7237 parity have been added. 7238 * The -fwritable-strings option has been deprecated and will be 7239 removed. 7240 * Many C math library functions are now recognized as built-ins and 7241 optimized. 7242 * The C, C++, and Objective-C compilers can now handle source files 7243 written in any character encoding supported by the host C library. 7244 The default input character set is taken from the current locale, 7245 and may be overridden with the -finput-charset command line option. 7246 In the future we will add support for inline encoding markers. 7247 7248 C++ 7249 7250 * G++ is now much closer to full conformance to the ISO/ANSI C++ 7251 standard. This means, among other things, that a lot of invalid 7252 constructs which used to be accepted in previous versions will now 7253 be rejected. It is very likely that existing C++ code will need to 7254 be fixed. This document lists some of the most common issues. 7255 * A hand-written recursive-descent C++ parser has replaced the 7256 YACC-derived C++ parser from previous GCC releases. The new parser 7257 contains much improved infrastructure needed for better parsing of 7258 C++ source codes, handling of extensions, and clean separation 7259 (where possible) between proper semantics analysis and parsing. The 7260 new parser fixes many bugs that were found in the old parser. 7261 * You must now use the typename and template keywords to disambiguate 7262 dependent names, as required by the C++ standard. 7263 struct K { 7264 typedef int mytype_t; 7265 }; 7266 7267 template <class T1> struct A { 7268 template <class T2> struct B { 7269 void callme(void); 7270 }; 7271 7272 template <int N> void bar(void) 7273 { 7274 // Use 'typename' to tell the parser that T1::mytype_t names 7275 // a type. This is needed because the name is dependent (in 7276 // this case, on template parameter T1). 7277 typename T1::mytype_t x; 7278 x = 0; 7279 } 7280 }; 7281 7282 template <class T> void template_func(void) 7283 { 7284 // Use 'template' to prefix member templates within 7285 // dependent types (a has type A<T>, which depends on 7286 // the template parameter T). 7287 A<T> a; 7288 a.template bar<0>(); 7289 7290 // Use 'template' to tell the parser that B is a nested 7291 // template class (dependent on template parameter T), and 7292 // 'typename' because the whole A<T>::B<int> is 7293 // the name of a type (again, dependent). 7294 typename A<T>::template B<int> b; 7295 b.callme(); 7296 } 7297 7298 void non_template_func(void) 7299 { 7300 // Outside of any template class or function, no names can be 7301 // dependent, so the use of the keyword 'typename' and 'template' 7302 // is not needed (and actually forbidden). 7303 A<K> a; 7304 a.bar<0>(); 7305 A<K>::B<float> b; 7306 b.callme(); 7307 } 7308 * In a template definition, unqualified names will no longer find 7309 members of a dependent base (as specified by [temp.dep]/3 in the 7310 C++ standard). For example, 7311 template <typename T> struct B { 7312 int m; 7313 int n; 7314 int f (); 7315 int g (); 7316 }; 7317 int n; 7318 int g (); 7319 template <typename T> struct C : B<T> { 7320 void h () 7321 { 7322 m = 0; // error 7323 f (); // error 7324 n = 0; // ::n is modified 7325 g (); // ::g is called 7326 } 7327 }; 7328 You must make the names dependent, e.g. by prefixing them with 7329 this->. Here is the corrected definition of C<T>::h, 7330 template <typename T> void C<T>::h () 7331 { 7332 this->m = 0; 7333 this->f (); 7334 this->n = 0 7335 this->g (); 7336 } 7337 As an alternative solution (unfortunately not backwards compatible 7338 with GCC 3.3), you may use using declarations instead of this->: 7339 template <typename T> struct C : B<T> { 7340 using B<T>::m; 7341 using B<T>::f; 7342 using B<T>::n; 7343 using B<T>::g; 7344 void h () 7345 { 7346 m = 0; 7347 f (); 7348 n = 0; 7349 g (); 7350 } 7351 }; 7352 * In templates, all non-dependent names are now looked up and bound 7353 at definition time (while parsing the code), instead of later when 7354 the template is instantiated. For instance: 7355 void foo(int); 7356 7357 template <int> struct A { 7358 static void bar(void){ 7359 foo('a'); 7360 } 7361 }; 7362 7363 void foo(char); 7364 7365 int main() 7366 { 7367 A<0>::bar(); // Calls foo(int), used to call foo(char). 7368 } 7369 7370 * In an explicit instantiation of a class template, you must use 7371 class or struct before the template-id: 7372 template <int N> 7373 class A {}; 7374 7375 template A<0>; // error, not accepted anymore 7376 template class A<0>; // OK 7377 * The "named return value" and "implicit typename" extensions have 7378 been removed. 7379 * Default arguments in function types have been deprecated and will 7380 be removed. 7381 * ARM-style name-injection of friend declarations has been deprecated 7382 and will be removed. For example: struct S { friend void f(); }; 7383 void g() { f(); } will not be accepted by future versions of G++; 7384 instead a declaration of "f" will need to be present outside of the 7385 scope of "S". 7386 * Covariant returns are implemented for all but varadic functions 7387 that require an adjustment. 7388 * When -pedantic is used, G++ now issues errors about spurious 7389 semicolons. For example, 7390 namespace N {}; // Invalid semicolon. 7391 void f() {}; // Invalid semicolon. 7392 * G++ no longer accepts attributes for a declarator after the 7393 initializer associated with that declarator. For example, 7394 X x(1) __attribute__((...)); 7395 is no longer accepted. Instead, use: 7396 X x __attribute__((...)) (1); 7397 * Inside the scope of a template class, the name of the class itself 7398 can be treated as either a class or a template. So GCC used to 7399 accept the class name as argument of type template, and template 7400 template parameter. However this is not C++ standard compliant. Now 7401 the name is not treated as a valid template template argument 7402 unless you qualify the name by its scope. For example, the code 7403 below no longer compiles. 7404 template <template <class> class TT> class X {}; 7405 template <class T> class Y { 7406 X<Y> x; // Invalid, Y is always a type template parameter. 7407 }; 7408 The valid code for the above example is 7409 X< ::Y> x; // Valid. 7410 (Notice the space between < and : to prevent GCC to interpret this 7411 as a digraph for [.) 7412 * Friend declarations that refer to template specializations are 7413 rejected if the template has not already been declared. For 7414 example, 7415 template <typename T> 7416 class C { 7417 friend void f<> (C&); 7418 }; 7419 is rejected. You must first declare f as a template, 7420 template <typename T> 7421 void f(T); 7422 * In case of friend declarations, every name used in the friend 7423 declaration must be accessible at the point of that declaration. 7424 Previous versions of G++ used to be less strict about this and 7425 allowed friend declarations for private class members, for example. 7426 See the ISO C++ Standard Committee's [11]defect report #209 for 7427 details. 7428 * Declaration of member functions of class templates as friends are 7429 supported. For example, 7430 template <typename T> struct A { 7431 void f(); 7432 }; 7433 class C { 7434 template <typename T> friend void A<T>::f(); 7435 }; 7436 * You must use template <> to introduce template specializations, as 7437 required by the standard. For example, 7438 template <typename T> 7439 struct S; 7440 7441 struct S<int> { }; 7442 is rejected. You must write, 7443 template <> struct S<int> {}; 7444 * G++ used to accept code like this, 7445 struct S { 7446 int h(); 7447 void f(int i = g()); 7448 int g(int i = h()); 7449 }; 7450 This behavior is not mandated by the standard. Now G++ issues an 7451 error about this code. To avoid the error, you must move the 7452 declaration of g before the declaration of f. The default arguments 7453 for g must be visible at the point where it is called. 7454 * The C++ ABI Section 3.3.3 specifications for the array construction 7455 routines __cxa_vec_new2 and __cxa_vec_new3 were changed to return 7456 NULL when the allocator argument returns NULL. These changes are 7457 incorporated into the libstdc++ runtime library. 7458 * Using a name introduced by a typedef in a friend declaration or in 7459 an explicit instantiation is now rejected, as specified by the ISO 7460 C++ standard. 7461 class A; 7462 typedef A B; 7463 class C { 7464 friend class B; // error, no typedef name here 7465 friend B; // error, friend always needs class/struct/enum 7466 friend class A; // OK 7467 }; 7468 7469 template <int> class Q {}; 7470 typedef Q<0> R; 7471 template class R; // error, no typedef name here 7472 template class Q<0>; // OK 7473 * When allocating an array with a new expression, GCC used to allow 7474 parentheses around the type name. This is actually ill-formed and 7475 it is now rejected: 7476 int* a = new (int)[10]; // error, not accepted anymore 7477 int* a = new int[10]; // OK 7478 * When binding an rvalue of class type to a reference, the copy 7479 constructor of the class must be accessible. For instance, consider 7480 the following code: 7481 class A 7482 { 7483 public: 7484 A(); 7485 7486 private: 7487 A(const A&); // private copy ctor 7488 }; 7489 7490 A makeA(void); 7491 void foo(const A&); 7492 7493 void bar(void) 7494 { 7495 foo(A()); // error, copy ctor is not accessible 7496 foo(makeA()); // error, copy ctor is not accessible 7497 7498 A a1; 7499 foo(a1); // OK, a1 is a lvalue 7500 } 7501 This might be surprising at first sight, especially since most 7502 popular compilers do not correctly implement this rule ([12]further 7503 details). 7504 * When forming a pointer to member or a pointer to member function, 7505 access checks for class visibility (public, protected, private) are 7506 now performed using the qualifying scope of the name itself. This 7507 is better explained with an example: 7508 class A 7509 { 7510 public: 7511 void pub_func(); 7512 protected: 7513 void prot_func(); 7514 private: 7515 void priv_func(); 7516 }; 7517 7518 class B : public A 7519 { 7520 public: 7521 void foo() 7522 { 7523 &A::pub_func; // OK, pub_func is accessible through A 7524 &A::prot_func; // error, cannot access prot_func through A 7525 &A::priv_func; // error, cannot access priv_func through A 7526 7527 &B::pub_func; // OK, pub_func is accessible through B 7528 &B::prot_func; // OK, can access prot_func through B (within B) 7529 &B::priv_func; // error, cannot access priv_func through B 7530 } 7531 }; 7532 7533 Runtime Library (libstdc++) 7534 7535 * Optimization work: 7536 + Streamlined streambuf, filebuf, separate synched with C 7537 Standard I/O streambuf. 7538 + All formatted I/O now uses cached locale information. 7539 + STL optimizations (memory/speed for list, red-black trees as 7540 used by sets and maps). 7541 + More use of GCC builtins. 7542 + String optimizations (avoid contention on 7543 increment/decrement-and-test of the reference count in the 7544 empty-string object, constructor from input_iterators 7545 speedup). 7546 * Static linkage size reductions. 7547 * Large File Support (files larger than 2 GB on 32-bit systems). 7548 * Wide character and variable encoding filebuf work (UTF-8, Unicode). 7549 * Generic character traits. 7550 * Also support wchar_t specializations on Mac OS 10.3.x, FreeBSD 5.x, 7551 Solaris 2.7 and above, AIX 5.x, Irix 6.5. 7552 * The allocator class is now standard-conformant, and two additional 7553 extension allocators have been added, mt_alloc and 7554 bitmap_allocator. 7555 * PCH support: -include bits/stdc++.h (2x compile speedup). 7556 * Rewrote __cxa_demangle with support for C++ style allocators. 7557 * New debug modes for STL containers and iterators. 7558 * Testsuite rewrite: five times as many tests, plus increasingly 7559 sophisticated tests, including I/O, MT, multi-locale, wide and 7560 narrow characters. 7561 * Use current versions of GNU "autotools" for build/configuration. 7562 7563 Objective-C 7564 7565 * The Objective-C front end has been updated to include the numerous 7566 bug fixes and enhancements previously available only in Apple's 7567 version of GCC. These include: 7568 + Structured exception (@try... @catch... @finally, @throw) and 7569 synchronization (@synchronized) support. These are accessible 7570 via the -fobjc-exceptions switch; as of this writing, they may 7571 only be used in conjunction with -fnext-runtime on Mac OS X 7572 10.3 and later. See [13]Options Controlling Objective-C 7573 Dialect for more information. 7574 + An overhaul of @encode logic. The C99 _Bool and C++ bool type 7575 may now be encoded as 'B'. In addition, the back-end/codegen 7576 dependencies have been removed. 7577 + An overhaul of message dispatch construction, ensuring that 7578 the various receiver types (and casts thereof) are handled 7579 properly, and that correct diagnostics are issued. 7580 + Support for "Zero-Link" (-fzero-link) and "Fix-and-Continue" 7581 (-freplace-objc-classes) debugging modes, currently available 7582 on Mac OS X 10.3 and later. See [14]Options Controlling 7583 Objective-C Dialect for more information. 7584 + Access to optimized runtime entry points (-fno-nil-receivers ) 7585 on the assumption that message receivers are never nil. This 7586 is currently available on Mac OS X 10.3 and later. See 7587 [15]Options Controlling Objective-C Dialect for more 7588 information. 7589 7590 Java 7591 7592 * Compiling a .jar file will now cause non-.class entries to be 7593 automatically compiled as resources. 7594 * libgcj has been ported to Darwin. 7595 * Jeff Sturm has adapted Jan Hubicka's call graph optimization code 7596 to gcj. 7597 * libgcj has a new gcjlib URL type; this lets URLClassLoader load 7598 code from shared libraries. 7599 * libgcj has been much more completely merged with [16]GNU Classpath. 7600 * Class loading is now much more correct; in particular the caller's 7601 class loader is now used when that is required. 7602 * [17]Eclipse 2.x will run out of the box using gij. 7603 * Parts of java.nio have been implemented. Direct and indirect 7604 buffers work, as do fundamental file and socket operations. 7605 * java.awt has been improved, though it is still not ready for 7606 general use. 7607 * The HTTP protocol handler now uses HTTP/1.1 and can handle the POST 7608 method. 7609 * The MinGW port has matured. Enhancements include socket timeout 7610 support, thread interruption, improved Runtime.exec() handling and 7611 support for accented characters in filenames. 7612 7613 Fortran 7614 7615 * Fortran improvements are listed in the [18]Fortran documentation. 7616 7617 New Targets and Target Specific Improvements 7618 7619 Alpha 7620 7621 * Several [19]built-in functions have been added such as 7622 __builtin_alpha_zap to allow utilizing the more obscure 7623 instructions of the CPU. 7624 * Parameter passing of complex arguments has changed to match the 7625 [20]ABI. This change is incompatible with previous GCC versions, 7626 but does fix compatibility with the Tru64 compiler and several 7627 corner cases where GCC was incompatible with itself. 7628 7629 ARM 7630 7631 * Nicolas Pitre has contributed his hand-coded floating-point support 7632 code for ARM. It is both significantly smaller and faster than the 7633 existing C-based implementation, even when building applications 7634 for Thumb. The arm-elf configuration has been converted to use the 7635 new code. 7636 * Support for the Intel's iWMMXt architecture, a second generation 7637 XScale processor, has been added. Enabled at run time with the 7638 -mcpu=iwmmxt command line switch. 7639 * A new ARM target has been added: arm-wince-pe. This is similar to 7640 the arm-pe target, but it defaults to using the APCS32 ABI. 7641 * The existing ARM pipeline description has been converted to the use 7642 the [21]DFA processor pipeline model. There is not much change in 7643 code performance, but the description is now [22]easier to 7644 understand. 7645 * Support for the Cirrus EP9312 Maverick floating point co-processor 7646 added. Enabled at run time with the -mcpu=ep9312 command line 7647 switch. Note however that the multilibs to support this chip are 7648 currently disabled in gcc/config/arm/t-arm-elf, so if you want to 7649 enable their production you will have to uncomment the entries in 7650 that file. 7651 7652 H8/300 7653 7654 * Support for long long has been added. 7655 * Support for saveall attribute has been added. 7656 * Pavel Pisa contributed hand-written 32-bit-by-32-bit division code 7657 for H8/300H and H8S, which is much faster than the previous 7658 implementation. 7659 * A lot of small performance improvements. 7660 7661 IA-32/AMD64 (x86-64) 7662 7663 * Tuning for K8 (AMD Opteron/Athlon64) core is available via 7664 -march=k8 and -mcpu=k8. 7665 * Scalar SSE code generation carefully avoids reformatting penalties, 7666 hidden dependencies and minimizes the number of uops generated on 7667 both Intel and AMD CPUs. 7668 * Vector MMX and SSE operands are now passed in registers to improve 7669 performance and match the argument passing convention used by the 7670 Intel C++ Compiler. As a result it is not possible to call 7671 functions accepting vector arguments compiled by older GCC version. 7672 * Conditional jump elimination is now more aggressive on modern CPUs. 7673 * The Athlon ports has been converted to use the DFA processor 7674 pipeline description. 7675 * Optimization of indirect tail calls is now possible in a similar 7676 fashion as direct sibcall optimization. 7677 * Further small performance improvements. 7678 * -m128bit-long-double is now less buggy. 7679 * __float128 support in 64-bit compilation. 7680 * Support for data structures exceeding 2GB in 64-bit mode. 7681 * -mcpu has been renamed to -mtune. 7682 7683 IA-64 7684 7685 * Tuning code for the Itanium 2 processor has been added. The 7686 generation of code tuned for Itanium 2 (option -mtune=itanium2) is 7687 enabled by default now. To generate code tuned for Itanium 1 the 7688 option -mtune=itanium1 should be used. 7689 * [23]DFA processor pipeline descriptions for the IA-64 processors 7690 have been added. This resulted in about 3% improvement on the 7691 SPECInt2000 benchmark for Itanium 2. 7692 * Instruction bundling for the IA-64 processors has been rewritten 7693 using the DFA pipeline hazard recognizer. It resulted in about 60% 7694 compiler speedup on the SPECInt2000 C programs. 7695 7696 M32R 7697 7698 * Support for the M32R/2 processor has been added by Renesas. 7699 * Support for an M32R GNU/Linux target and PIC code generation has 7700 been added by Renesas. 7701 7702 M68000 7703 7704 * Bernardo Innocenti (Develer S.r.l.) has contributed the 7705 m68k-uclinux target, based on former work done by Paul Dale 7706 (SnapGear Inc.). Code generation for the ColdFire processors family 7707 has been enhanced and extended to support the MCF 53xx and MCF 54xx 7708 cores, integrating former work done by Peter Barada (Motorola). 7709 7710 MIPS 7711 7712 Processor-specific changes 7713 7714 * Support for the RM7000 and RM9000 processors has been added. It can 7715 be selected using the -march compiler option and should work with 7716 any MIPS I (mips-*) or MIPS III (mips64-*) configuration. 7717 * Support for revision 2 of the MIPS32 ISA has been added. It can be 7718 selected with the command-line option -march=mips32r2. 7719 * There is a new option, -mfix-sb1, to work around certain SB-1 7720 errata. 7721 7722 Configuration 7723 7724 * It is possible to customize GCC using the following configure-time 7725 options: 7726 + --with-arch, which specifies the default value of the -march 7727 option. 7728 + --with-tune, which specifies the default value of the -mtune 7729 option. 7730 + --with-abi, which specifies the default ABI. 7731 + --with-float=soft, which tells GCC to use software floating 7732 point by default. 7733 + --with-float=hard, which tells GCC to use hardware floating 7734 point by default. 7735 * A 64-bit GNU/Linux port has been added. The associated 7736 configurations are mips64-linux-gnu and mips64el-linux-gnu. 7737 * The 32-bit GNU/Linux port now supports Java. 7738 * The IRIX 6 configuration now supports the o32 ABI and will build 7739 o32 multilibs by default. This support is compatible with both 7740 binutils and the SGI tools, but note that several features, 7741 including debugging information and DWARF2 exception handling, are 7742 only available when using the GNU assembler. Use of the GNU 7743 assembler and linker (version 2.15 or above) is strongly 7744 recommended. 7745 * The IRIX 6 configuration now supports 128-bit long doubles. 7746 * There are two new RTEMS-specific configurations, mips-rtems and 7747 mipsel-rtems. 7748 * There are two new *-elf configurations, mipsisa32r2-elf and 7749 mipsisa32r2el-elf. 7750 7751 General 7752 7753 * Several [24]ABI bugs have been fixed. Unfortunately, these changes 7754 will break binary compatibility with earlier releases. 7755 * GCC can now use explicit relocation operators when generating 7756 -mabicalls code. This behavior is controlled by -mexplicit-relocs 7757 and can have several performance benefits. For example: 7758 + It allows for more optimization of GOT accesses, including 7759 better scheduling and redundancy elimination. 7760 + It allows sibling calls to be implemented as jumps. 7761 + n32 and n64 leaf functions can use a call-clobbered global 7762 pointer instead of $28. 7763 + The code to set up $gp can be removed from functions that 7764 don't need it. 7765 * A new option, -mxgot, allows the GOT to be bigger than 64k. This 7766 option is equivalent to the assembler's -xgot option and should be 7767 used instead of -Wa,-xgot. 7768 * Frame pointer elimination is now supported when generating 64-bit 7769 MIPS16 code. 7770 * Inline block moves have been optimized to take more account of 7771 alignment information. 7772 * Many internal changes have been made to the MIPS port, mostly aimed 7773 at reducing the reliance on assembler macros. 7774 7775 PowerPC 7776 7777 * GCC 3.4 releases have a number of fixes for PowerPC and PowerPC64 7778 [25]ABI incompatibilities regarding the way parameters are passed 7779 during functions calls. These changes may result in incompatibility 7780 between code compiled with GCC 3.3 and GCC 3.4. 7781 7782 PowerPC Darwin 7783 7784 * Support for shared/dylib gcc libraries has been added. It is 7785 enabled by default on powerpc-apple-darwin7.0.0 and up. 7786 * Libgcj is enabled by default. On systems older than 7787 powerpc-apple-darwin7.0.0 you need to install dlcompat. 7788 * 128-bit IBM extended precision format support added for long 7789 double. 7790 7791 PowerPC64 GNU/Linux 7792 7793 * By default, PowerPC64 GNU/Linux now uses natural alignment of 7794 structure elements. The old four byte alignment for double, with 7795 special rules for a struct starting with a double, can be chosen 7796 with -malign-power. This change may result in incompatibility 7797 between code compiled with GCC 3.3 and GCC 3.4. 7798 * -mabi=altivec is now the default rather than -mabi=no-altivec. 7799 * 128-bit IBM extended precision format support added for long 7800 double. 7801 7802 S/390 and zSeries 7803 7804 * New command-line options allow to specify the intended execution 7805 environment for generated code: 7806 + -mesa/-mzarch allows to specify whether to generate code 7807 running in ESA/390 mode or in z/Architecture mode (this is 7808 applicable to 31-bit code only). 7809 + -march allows to specify a minimum processor architecture 7810 level (g5, g6, z900, or z990). 7811 + -mtune allows to specify which processor to tune for. 7812 * It is possible to customize GCC using the following configure-time 7813 options: 7814 + --with-mode, which specifies whether to default to assuming 7815 ESA/390 or z/Architecture mode. 7816 + --with-arch, which specifies the default value of the -march 7817 option. 7818 + --with-tune, which specifies the default value of the -mtune 7819 option. 7820 * Support for the z990 processor has been added, and can be selected 7821 using -march=z990 or -mtune=z990. This includes instruction 7822 scheduling tuned for the superscalar instruction pipeline of the 7823 z990 processor as well as support for all new instructions provided 7824 by the long-displacement facility. 7825 * Support to generate 31-bit code optimized for zSeries processors 7826 (running in ESA/390 or in z/Architecture mode) has been added. This 7827 can be selected using -march=z900 and -mzarch respectively. 7828 * Instruction scheduling for the z900 and z990 processors now uses 7829 the DFA pipeline hazard recognizer. 7830 * GCC no longer generates code to maintain a stack backchain, 7831 previously used to generate stack backtraces for debugging 7832 purposes. As replacement that does not incur runtime overhead, 7833 DWARF-2 call frame information is provided by GCC; this is 7834 supported by GDB 6.1. The old behavior can be restored using the 7835 -mbackchain option. 7836 * The stack frame size of functions may now exceed 2 GB in 64-bit 7837 code. 7838 * A port for the 64-bit IBM TPF operating system has been added; the 7839 configuration is s390x-ibm-tpf. This configuration is supported as 7840 cross-compilation target only. 7841 * Various changes to improve the generated code have been 7842 implemented, including: 7843 + GCC now uses the MULTIPLY AND ADD and MULTIPLY AND SUBTRACT 7844 instructions to significantly speed up many floating-point 7845 applications. 7846 + GCC now uses the ADD LOGICAL WITH CARRY and SUBTRACT LOGICAL 7847 WITH BORROW instructions to speed up long long arithmetic. 7848 + GCC now uses the SEARCH STRING instruction to implement 7849 strlen(). 7850 + In many cases, function call overhead for 31-bit code has been 7851 reduced by placing the literal pool after the function code 7852 instead of after the function prolog. 7853 + Register 14 is no longer reserved in 64-bit code. 7854 + Handling of global register variables has been improved. 7855 7856 SPARC 7857 7858 * The option -mflat is deprecated. 7859 * Support for large (> 2GB) frames has been added to the 64-bit port. 7860 * Several [26]ABI bugs have been fixed. Unfortunately, these changes 7861 will break binary compatibility with earlier releases. 7862 * The default debugging format has been switched from STABS to 7863 DWARF-2 for 32-bit code on Solaris 7 and later. DWARF-2 is already 7864 the default debugging format for 64-bit code on Solaris. 7865 7866 SuperH 7867 7868 * Support for the SH2E processor has been added. Enabled at run time 7869 with the -m2e command line switch, or at configure time by 7870 specifying sh2e as the machine part of the target triple. 7871 7872 V850 7873 7874 * Support for the Mitsubishi V850E1 processor has been added. This is 7875 a variant of the V850E processor with some additional debugging 7876 instructions. 7877 7878 Xtensa 7879 7880 * Several ABI bugs have been fixed. Unfortunately, these changes 7881 break binary compatibility with earlier releases. 7882 + For big-endian processors, the padding of aggregate return 7883 values larger than a word has changed. If the size of an 7884 aggregate return value is not a multiple of 32 bits, previous 7885 versions of GCC inserted padding in the most-significant bytes 7886 of the first return value register. Aggregates larger than a 7887 word are now padded in the least-significant bytes of the last 7888 return value register used. Aggregates smaller than a word are 7889 still padded in the most-significant bytes. The return value 7890 padding has not changed for little-endian processors. 7891 + Function arguments with 16-byte alignment are now properly 7892 aligned. 7893 + The implementation of the va_list type has changed. A va_list 7894 value created by va_start from a previous release cannot be 7895 used with va_arg from this release, or vice versa. 7896 * More processor configuration options for Xtensa processors are 7897 supported: 7898 + the ABS instruction is now optional; 7899 + the ADDX* and SUBX* instructions are now optional; 7900 + an experimental CONST16 instruction can be used to synthesize 7901 constants instead of loading them from constant pools. 7902 These and other Xtensa processor configuration options can no 7903 longer be enabled or disabled by command-line options; the 7904 processor configuration must be specified by the xtensa-config.h 7905 header file when building GCC. Additionally, the 7906 -mno-serialize-volatile option is no longer supported. 7907 7908 Obsolete Systems 7909 7910 Support for a number of older systems has been declared obsolete in GCC 7911 3.4. Unless there is activity to revive them, the next release of GCC 7912 will have their sources permanently removed. 7913 7914 All configurations of the following processor architectures have been 7915 declared obsolete: 7916 * Mitsubishi D30V, d30v-* 7917 * AT&T DSP1600 and DSP1610, dsp16xx-* 7918 * Intel 80960, i960 7919 7920 Also, some individual systems have been obsoleted: 7921 * ARM Family 7922 + Support for generating code for operation in APCS/26 mode 7923 (-mapcs-26). 7924 * IBM ESA/390 7925 + "Bigfoot" port, i370-*. (The other port, s390-*, is actively 7926 maintained and supported.) 7927 * Intel 386 family 7928 + MOSS, i?86-moss-msdos and i?86-*-moss* 7929 + NCR 3000 running System V r.4, i?86-ncr-sysv4* 7930 + FreeBSD with a.out object format, i?86-*-freebsd*aout* and 7931 i?86-*-freebsd2* 7932 + GNU/Linux with a.out object format, i?86-linux*aout* 7933 + GNU/Linux with libc5, a.k.a. glibc1, i?86-linux*libc1* 7934 + Interix versions before Interix 3, i?86-*-interix 7935 + Mach microkernel, i?86-mach* 7936 + SCO UnixWare with UDK, i?86-*-udk* 7937 + Generic System V releases 1, 2, and 3, i?86-*-sysv[123]* 7938 + VSTa microkernel, i386-*-vsta 7939 * Motorola M68000 family 7940 + HPUX, m68k-hp-hpux* and m68000-hp-hpux* 7941 + NetBSD with a.out object format (before NetBSD 1.4), 7942 m68k-*-*-netbsd* except m68k-*-*-netbsdelf* 7943 + Generic System V r.4, m68k-*-sysv4* 7944 * VAX 7945 + Generic VAX, vax-*-* (This is generic VAX only; we have not 7946 obsoleted any VAX triples for specific operating systems.) 7947 7948 Documentation improvements 7949 7950 Other significant improvements 7951 7952 * The build system has undergone several significant cleanups. 7953 Subdirectories will only be configured if they are being built, and 7954 all subdirectory configures are run from the make command. The top 7955 level has been autoconfiscated. 7956 * Building GCC no longer writes to its source directory. This should 7957 help those wishing to share a read-only source directory over NFS 7958 or build from a CD. The exceptions to this feature are if you 7959 configure with either --enable-maintainer-mode or 7960 --enable-generated-files-in-srcdir. 7961 * The -W warning option has been renamed to -Wextra, which is more 7962 easily understood. The older spelling will be retained for 7963 backwards compatibility. 7964 * Substantial improvements in compile time have been made, 7965 particularly for non-optimizing compilations. 7966 __________________________________________________________________ 7967 7968 GCC 3.4.0 7969 7970 Bug Fixes 7971 7972 A vast number of bugs have been fixed in 3.4.0, too many to publish a 7973 complete list here. [27]Follow this link to query the Bugzilla database 7974 for the list of over 900 bugs fixed in 3.4.0. This is the list of all 7975 bugs marked as resolved and fixed in 3.4.0 that are not flagged as 3.4 7976 regressions. 7977 __________________________________________________________________ 7978 7979 GCC 3.4.1 7980 7981 Bug Fixes 7982 7983 This section lists the problem reports (PRs) from GCC's bug tracking 7984 system that are known to be fixed in the 3.4.1 release. This list might 7985 not be complete (that is, it is possible that some PRs that have been 7986 fixed are not listed here). 7987 7988 Bootstrap failures 7989 7990 * [28]10129 Ada bootstrap fails on PPC-Darwin - invalid assembler 7991 emitted - PIC related 7992 * [29]14576 [ARM] ICE in libiberty when building gcc-3.4 for arm-elf 7993 * [30]14760 A bug in configure.in prevents using both 7994 --program-suffix and --program-prefix 7995 * [31]14671 [hppa64] bootstrap fails: ICE in 7996 save_call_clobbered_regs, in caller_save.c 7997 * [32]15093 [alpha][Java] make bootstrap fails to configure libffi on 7998 Alpha 7999 * [33]15178 Solaris 9/x86 fails linking after stage 3 8000 8001 Multi-platform internal compiler errors (ICEs) 8002 8003 * [34]12753 (preprocessor) Memory corruption in preprocessor on bad 8004 input 8005 * [35]13985 ICE in gcc.c-torture/compile/930621-1.c 8006 * [36]14810 (c++) tree check failures with invalid code involving 8007 templates 8008 * [37]14883 (c++) ICE on invalid code, in cp_parser_lookup_name, in 8009 cp/parser.c 8010 * [38]15044 (c++) ICE on syntax error, template header 8011 * [39]15057 (c++) Compiling of conditional value throw constructs 8012 cause a segmentation violation 8013 * [40]15064 (c++) typeid of template parameter gives ICE 8014 * [41]15142 (c++) ICE when passing a string where a char* is expected 8015 in a throw statement 8016 * [42]15159 ICE in rtl_verify_flow_info_1 8017 * [43]15165 (c++) ICE in instantiate_template 8018 * [44]15193 Unary minus using pointer to V4SF vector causes 8019 -fforce-mem to exhaust all memory 8020 * [45]15209 (c++) Runs out of memory with packed structs 8021 * [46]15227 (c++) Trouble with invalid function definition 8022 * [47]15285 (c++) instantiate_type ICE when forming pointer to 8023 template function 8024 * [48]15299 (c++) ICE in resolve_overloaded_unification 8025 * [49]15329 (c++) ICE on constructor of member template 8026 * [50]15550 ICE in extract_insn, in recog.c 8027 * [51]15554 (c++) ICE in tsubst_copy, in cp/pt.c 8028 * [52]15640 (c++) ICE on invalid code in arg_assoc, in 8029 cp/name-lookup.c 8030 * [53]15666 [unit-at-a-time] Gcc abort on valid code 8031 * [54]15696 (c++) ICE with bad pointer-to-member code 8032 * [55]15701 (c++) ICE with friends and template template parameter 8033 * [56]15761 ICE in do_SUBST, in combine.c 8034 * [57]15829 (c++) ICE on Botan-1.3.13 due to -funroll-loops 8035 8036 Ada 8037 8038 * [58]14538 All RTEMS targets broken for gnat 8039 8040 C front end 8041 8042 * [59]12391 missing warning about assigning to an incomplete type 8043 * [60]14649 atan(1.0) should not be a constant expression 8044 * [61]15004 [unit-at-a-time] no warning for unused paramater in 8045 static function 8046 * [62]15749 --pedantic-errors behaves differently from --pedantic 8047 with C-compiler on GNU/Linux 8048 8049 C++ compiler and library 8050 8051 * [63]10646 non-const reference is incorrectly matched in a "const T" 8052 partial specialization 8053 * [64]12077 wcin.rdbuf()->in_avail() return value too high 8054 * [65]13598 enc_filebuf doesn't work 8055 * [66]14211 const_cast returns lvalue but should be rvalue 8056 * [67]14220 num_put::do_put() undesired float/double behavior 8057 * [68]14245 problem with user-defined allocators in std::basic_string 8058 * [69]14340 libstdc++ Debug mode: failure to convert iterator to 8059 const_iterator 8060 * [70]14600 __gnu_cxx::stdio_sync_filebuf should expose internal 8061 FILE* 8062 * [71]14668 no warning anymore for reevaluation of declaration 8063 * [72]14775 LFS (large file support) tests missing 8064 * [73]14821 Duplicate namespace alias declaration should not conflict 8065 * [74]14930 Friend declaration ignored 8066 * [75]14932 cannot use offsetof to get offsets of array elements in 8067 g++ 3.4.0 8068 * [76]14950 [non unit-at-a-time] always_inline does not mix with 8069 templates and -O0 8070 * [77]14962 g++ ignores #pragma redefine_extname 8071 * [78]14975 Segfault on low-level write error during imbue 8072 * [79]15002 Linewise stream input is unusably slow (std::string slow) 8073 * [80]15025 compiler accepts redeclaration of template as 8074 non-template 8075 * [81]15046 [arm] Math functions misdetected by cross configuration 8076 * [82]15069 a bit test on a variable of enum type is miscompiled 8077 * [83]15074 g++ -lsupc++ still links against libstdc++ 8078 * [84]15083 spurious "statement has no effect" warning 8079 * [85]15096 parse error with templates and pointer to const member 8080 * [86]15287 combination of operator[] and operator .* fails in 8081 templates 8082 * [87]15317 __attribute__ unused in first parameter of constructor 8083 gives error 8084 * [88]15337 sizeof on incomplete type diagnostic 8085 * [89]15361 bitset<>::_Find_next fails 8086 * [90]15412 _GLIBCXX_ symbols symbols defined and used in different 8087 namespaces 8088 * [91]15427 valid code results in incomplete type error 8089 * [92]15471 Incorrect member pointer offsets in anonymous 8090 structs/unions 8091 * [93]15503 nested template problem 8092 * [94]15507 compiler hangs while laying out union 8093 * [95]15542 operator & and template definitions 8094 * [96]15565 SLES9: leading + sign for unsigned int with showpos 8095 * [97]15625 friend defined inside a template fails to find static 8096 function 8097 * [98]15629 Function templates, overloads, and friend name injection 8098 * [99]15742 'noreturn' attribute ignored in method of template 8099 functions. 8100 * [100]15775 Allocator::pointer consistently ignored 8101 * [101]15821 Duplicate namespace alias within namespace rejected 8102 * [102]15862 'enum yn' fails (confict with undeclared builtin) 8103 * [103]15875 rejects pointer to member in template 8104 * [104]15877 valid code using templates and anonymous enums is 8105 rejected 8106 * [105]15947 Puzzling error message for wrong destructor declaration 8107 in template class 8108 * [106]16020 cannot copy __gnu_debug::bitset 8109 * [107]16154 input iterator concept too restrictive 8110 * [108]16174 deducing top-level consts 8111 8112 Java 8113 8114 * [109]14315 Java compiler is not parallel make safe 8115 8116 Fortran 8117 8118 * [110]15151 [g77] incorrect logical i/o in 64-bit mode 8119 8120 Objective-C 8121 8122 * [111]7993 private variables cannot be shadowed in subclasses 8123 8124 Optimization bugs 8125 8126 * [112]15228 useless copies of floating point operands 8127 * [113]15345 [non-unit-at-a-time] unreferenced nested inline 8128 functions not optimized away 8129 * [114]15945 Incorrect floating point optimization 8130 * [115]15526 ftrapv aborts on 0 * (-1) 8131 * [116]14690 Miscompiled POOMA tests 8132 * [117]15112 GCC generates code to write to unchanging memory 8133 8134 Preprocessor 8135 8136 * [118]15067 Minor glitch in the source of cpp 8137 8138 Main driver program bugs 8139 8140 * [119]1963 collect2 interprets -oldstyle_liblookup as -o 8141 ldstyle_liblookup 8142 8143 x86-specific (Intel/AMD) 8144 8145 * [120]15717 Error: can't resolve `L0' {*ABS* section} - `xx' {*UND* 8146 section} 8147 8148 HPPA-specific 8149 8150 * [121]14782 GCC produces an unaligned data access at -O2 8151 * [122]14828 FAIL: gcc.c-torture/execute/20030408-1.c execution, -O2 8152 * [123]15202 ICE in reload_cse_simplify_operands, in postreload.c 8153 8154 IA64-specific 8155 8156 * [124]14610 __float80 constants incorrectly emitted 8157 * [125]14813 init_array sections are initialized in the wrong order 8158 * [126]14857 GCC segfault on duplicated asm statement 8159 * [127]15598 Gcc 3.4 ICE on valid code 8160 * [128]15653 Gcc 3.4 ICE on valid code 8161 8162 MIPS-specific 8163 8164 * [129]15189 wrong filling of delay slot with -march=mips1 -G0 8165 -mno-split-addresses -mno-explicit-relocs 8166 * [130]15331 Assembler error building gnatlib on IRIX 6.5 with GNU as 8167 2.14.91 8168 * [131]16144 Bogus reference to __divdf3 when -O1 8169 * [132]16176 Miscompilation of unaligned data in MIPS backend 8170 8171 PowerPC-specific 8172 8173 * [133]11591 ICE in gcc.dg/altivec-5.c 8174 * [134]12028 powerpc-eabispe produces bad sCOND operation 8175 * [135]14478 rs6000 geu/ltu patterns generate incorrect code 8176 * [136]14567 long double and va_arg complex args 8177 * [137]14715 Altivec stack layout may overlap gpr save with stack 8178 temps 8179 * [138]14902 (libstdc++) Stream checking functions fail when -pthread 8180 option is used. 8181 * [139]14924 Compiler ICE on valid code 8182 * [140]14960 -maltivec affects vector return with -mabi=no-altivec 8183 * [141]15106 vector varargs failure passing from altivec to 8184 non-altivec code for -m32 8185 * [142]16026 ICE in function.c:4804, assign_parms, when -mpowerpc64 & 8186 half-word operation 8187 * [143]15191 -maltivec -mabi=no-altivec results in mis-aligned lvx 8188 and stvx 8189 * [144]15662 Segmentation fault when an exception is thrown - even if 8190 try and catch are specified 8191 8192 s390-specific 8193 8194 * [145]15054 Bad code due to overlapping stack temporaries 8195 8196 SPARC-specific 8197 8198 * [146]15783 ICE with union assignment in 64-bit mode 8199 * [147]15626 GCC 3.4 emits "ld: warning: relocation error: 8200 R_SPARC_UA32" 8201 8202 x86-64-specific 8203 8204 * [148]14326 boehm-gc hardcodes to 3DNow! prefetch for x86_64 8205 * [149]14723 Backported -march=nocona from mainline 8206 * [150]15290 __float128 failed to pass to function properly 8207 8208 Cygwin/Mingw32-specific 8209 8210 * [151]15250 Option -mms-bitfields support on GCC 3.4 is not 8211 conformant to MS layout 8212 * [152]15551 -mtune=pentium4 -O2 with sjlj EH breaks stack probe 8213 worker on windows32 targets 8214 8215 Bugs specific to embedded processors 8216 8217 * [153]8309 [m68k] -m5200 produces erroneous SImode set of short 8218 varaible on stack 8219 * [154]13250 [SH] Gcc code for rotation clobbers the register, but 8220 gcc continues to use the register as if it was not clobbered 8221 * [155]13803 [coldfire] movqi operand constraints too restrictivefor 8222 TARGET_COLDFIRE 8223 * [156]14093 [SH] ICE for code when using -mhitachi option in SH 8224 * [157]14457 [m6811hc] ICE with simple c++ source 8225 * [158]14542 [m6811hc] ICE on simple source 8226 * [159]15100 [SH] cc1plus got hang-up on 8227 libstdc++-v3/testsuite/abi_check.cc 8228 * [160]15296 [CRIS] Delayed branch scheduling causing invalid code on 8229 cris-* 8230 * [161]15396 [SH] ICE with -O2 -fPIC 8231 * [162]15782 [coldfire] m68k_output_mi_thunk emits wrong code for 8232 ColdFire 8233 8234 Testsuite problems (compiler not affected) 8235 8236 * [163]11610 libstdc++ testcases 27_io/* don't work properly remotely 8237 * [164]15488 (libstdc++) possibly insufficient file permissions for 8238 executing test suite 8239 * [165]15489 (libstdc++) testsuite_files determined incorrectly 8240 8241 Documentation bugs 8242 8243 * [166]13928 (libstdc++) no whatis info in some man pages generated 8244 by doxygen 8245 * [167]14150 Ada documentation out of date 8246 * [168]14949 (c++) Need to document method visibility changes 8247 * [169]15123 libstdc++-doc: Allocators.3 manpage is empty 8248 __________________________________________________________________ 8249 8250 GCC 3.4.2 8251 8252 Bug Fixes 8253 8254 This section lists the problem reports (PRs) from GCC's bug tracking 8255 system that are known to be fixed in the 3.4.2 release. This list might 8256 not be complete (that is, it is possible that some PRs that have been 8257 fixed are not listed here). 8258 8259 Bootstrap failures and issues 8260 8261 * [170]16469 [mips-sgi-irix5.3] bootstrap fails in 8262 libstdc++-v3/testsuite 8263 * [171]16344 [hppa-linux-gnu] libstdc++'s PCH built by 8264 profiledbootstrap does not work with the built compiler 8265 * [172]16842 [Solaris/x86] mkheaders can not find mkheaders.conf 8266 8267 Multi-platform internal compiler errors (ICEs) 8268 8269 * [173]12608 (c++) ICE: expected class 't', have 'x' (error_mark) in 8270 cp_parser_class_specifier, in cp/parser.c 8271 * [174]14492 ICE in loc_descriptor_from_tree, in dwarf2out.c 8272 * [175]15461 (c++) ICE due to NRV and inlining 8273 * [176]15890 (c++) ICE in c_expand_expr, in c-common.c 8274 * [177]16180 ICE: segmentation fault in RTL optimization 8275 * [178]16224 (c++) ICE in write_unscoped_name (template/namespace) 8276 * [179]16408 ICE: in delete_insn, in cfgrtl.c 8277 * [180]16529 (c++) ICE for: namespace-alias shall not be declared as 8278 the name of any other entity 8279 * [181]16698 (c++) ICE with exceptions and declaration of __cxa_throw 8280 * [182]16706 (c++) ICE in finish_member_declaration, in 8281 cp/semantics.c 8282 * [183]16810 (c++) Legal C++ program with cast gives ICE in 8283 build_ptrmemfunc 8284 * [184]16851 (c++) ICE when throwing a comma expression 8285 * [185]16870 (c++) Boost.Spirit causes ICE in tsubst, in cp/pt.c 8286 * [186]16904 (c++) ICE in finish_class_member_access_expr, in 8287 cp/typeck.c 8288 * [187]16905 (c++) ICE (segfault) with exceptions 8289 * [188]16964 (c++) ICE in cp_parser_class_specifier due to 8290 redefinition 8291 * [189]17068 (c++) ICE: tree check: expected class 'd', have 'x' 8292 (identifier_node) in dependent_template_p, in cp/pt.c 8293 8294 Preprocessor bugs 8295 8296 * [190]16366 Preprocessor option -remap causes memory corruption 8297 8298 Optimization 8299 8300 * [191]15345 unreferenced nested inline functions not optimized away 8301 * [192]16590 Incorrect execution when compiling with -O2 8302 * [193]16693 Bitwise AND is lost when used within a cast to an enum 8303 of the same precision 8304 * [194]17078 Jump into if(0) substatement fails 8305 8306 Problems in generated debug information 8307 8308 * [195]13956 incorrect stabs for nested local variables 8309 8310 C front end bugs 8311 8312 * [196]16684 GCC should not warn about redundant redeclarations of 8313 built-ins 8314 8315 C++ compiler and library 8316 8317 * [197]12658 Thread safety problems in locale::global() and 8318 locale::locale() 8319 * [198]13092 g++ accepts invalid pointer-to-member conversion 8320 * [199]15320 Excessive memory consumption 8321 * [200]16246 Incorrect template argument deduction 8322 * [201]16273 Memory exhausted when using nested classes and virtual 8323 functions 8324 * [202]16401 ostringstream in gcc 3.4.x very slow for big data 8325 * [203]16411 undefined reference to 8326 __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> 8327 >::file() 8328 * [204]16489 G++ incorrectly rejects use of a null constant integral 8329 expression as a null constant pointer 8330 * [205]16618 offsetof fails with constant member 8331 * [206]16637 syntax error reported for valid input code 8332 * [207]16717 __attribute__((constructor)) broken in C++ 8333 * [208]16813 compiler error in DEBUG version of range insertion 8334 std::map::insert 8335 * [209]16853 pointer-to-member initialization from incompatible one 8336 accepted 8337 * [210]16889 ambiguity is not detected 8338 * [211]16959 Segmentation fault in ios_base::sync_with_stdio 8339 8340 Java compiler and library 8341 8342 * [212]7587 direct threaded interpreter not thread-safe 8343 * [213]16473 ServerSocket accept() leaks file descriptors 8344 * [214]16478 Hash synchronization deadlock with finalizers 8345 8346 Alpha-specific 8347 8348 * [215]10695 ICE in dwarf2out_frame_debug_expr, in dwarf2out.c 8349 * [216]16974 could not split insn (ice in final_scan_insn, in 8350 final.c) 8351 8352 x86-specific 8353 8354 * [217]16298 ICE in output_operand 8355 * [218]17113 ICE with SSE2 intrinsics 8356 8357 x86-64 specific 8358 8359 * [219]14697 libstdc++ couldn't find 32bit libgcc_s 8360 8361 MIPS-specific 8362 8363 * [220]15869 [mips64] No NOP after LW (with -mips1 -O0) 8364 * [221]16325 [mips64] value profiling clobbers gp on mips 8365 * [222]16357 [mipsisa64-elf] ICE copying 7 bytes between extern 8366 char[]s 8367 * [223]16380 [mips64] Use of uninitialised register after dbra 8368 conversion 8369 * [224]16407 [mips64] Unaligned access to local variables 8370 * [225]16643 [mips64] verify_local_live_at_start ICE after 8371 crossjumping & cfgcleanup 8372 8373 ARM-specific 8374 8375 * [226]15927 THUMB -O2: strength-reduced iteration variable ends up 8376 off by 1 8377 * [227]15948 THUMB: ICE with non-commutative cbranch 8378 * [228]17019 THUMB: bad switch statement in md code for 8379 addsi3_cbranch_scratch 8380 8381 IA64-specific 8382 8383 * [229]16130 ICE on valid code: in bundling, in config/ia64/ia64.c 8384 (-mtune=merced) 8385 * [230]16142 ICE on valid code: in bundling, in config/ia64/ia64.c 8386 (-mtune=itanium) 8387 * [231]16278 Gcc failed to build Linux kernel with -mtune=merced 8388 * [232]16414 ICE on valid code: typo in comparison of asm_noperands 8389 result 8390 * [233]16445 ICE on valid code: don't count ignored insns 8391 * [234]16490 ICE (segfault) while compiling with -fprofile-use 8392 * [235]16683 ia64 does not honor SUBTARGET_EXTRA_SPECS 8393 8394 PowerPC-specific 8395 8396 * [236]16195 (ppc64): Miscompilation of GCC 3.3.x by 3.4.x 8397 * [237]16239 ICE on ppc64 (mozilla 1.7 compile, -O1 -fno-exceptions 8398 issue) 8399 8400 SPARC-specific 8401 8402 * [238]16199 ICE while compiling apache 2.0.49 8403 * [239]16416 -m64 doesn't imply -mcpu=v9 anymore 8404 * [240]16430 ICE when returning non-C aggregates larger than 16 bytes 8405 8406 Bugs specific to embedded processors 8407 8408 * [241]16379 [m32r] can't output large model function call of memcpy 8409 * [242]17093 [m32r] ICE with -msdata=use -O0 8410 * [243]17119 [m32r] ICE at switch case 0x8000 8411 8412 DJGPP-specific 8413 8414 * [244]15928 libstdc++ in 3.4.x doesn't cross-compile for djgpp 8415 8416 Alpha Tru64-specific 8417 8418 * [245]16210 libstdc++ gratuitously omits "long long" I/O 8419 8420 Testsuite, documentation issues (compiler is not affected): 8421 8422 * [246]15488 (libstdc++) possibly insufficient file permissions for 8423 executing test suite 8424 * [247]16250 ada/doctools runs makeinfo even in release tarball 8425 __________________________________________________________________ 8426 8427 GCC 3.4.3 8428 8429 This is the [248]list of problem reports (PRs) from GCC's bug tracking 8430 system that are known to be fixed in the 3.4.3 release. This list might 8431 not be complete (that is, it is possible that some PRs that have been 8432 fixed are not listed here). 8433 8434 Bootstrap failures 8435 8436 * [249]17369 [ia64] Bootstrap failure with binutils-2.15.90.0.1.1 8437 * [250]17850 [arm-elf] bootstrap failure - libstdc++ uses strtold 8438 when undeclared 8439 8440 Internal compiler errors (ICEs) affecting multiple platforms 8441 8442 * [251]13948 (java) GCJ segmentation fault while compiling GL4Java 8443 .class files 8444 * [252]14492 ICE in loc_descriptor_from_tree, in dwarf2out.c 8445 * [253]16301 (c++) ICE when "strong" attribute is attached to a using 8446 directive 8447 * [254]16566 ICE with flexible arrays 8448 * [255]17023 ICE with nested functions in parameter declaration 8449 * [256]17027 ICE with noreturn function in loop at -O2 8450 * [257]17524 ICE in grokdeclarator, in cp/decl.c 8451 * [258]17826 (c++) ICE in cp_tree_equal 8452 8453 C and optimization bugs 8454 8455 * [259]15526 -ftrapv aborts on 0 * (-1) 8456 * [260]16999 #ident stopped working 8457 * [261]17503 quadratic behaviour in invalid_mode_change_p 8458 * [262]17581 Long long arithmetic fails inside a switch/case 8459 statement when compiled with -O2 8460 * [263]18129 -fwritable-strings doesn't work 8461 8462 C++ compiler and library bugs 8463 8464 * [264]10975 incorrect initial ostringstream::tellp() 8465 * [265]11722 Unbuffered filebuf::sgetn is slow 8466 * [266]14534 Unrecognizing static function as a template parameter 8467 when its return value is also templated 8468 * [267]15172 Copy constructor optimization in aggregate 8469 initialization 8470 * [268]15786 Bad error message for frequently occuring error. 8471 * [269]16162 Rejects valid member-template-definition 8472 * [270]16612 empty basic_strings can't live in shared memory 8473 * [271]16715 std::basic_iostream is instantiated when used, even 8474 though instantiations are already contained in libstdc++ 8475 * [272]16848 code in /ext/demangle.h appears broken 8476 * [273]17132 GCC fails to eliminate function template specialization 8477 when argument deduction fails 8478 * [274]17259 One more _S_leaf incorrectly qualified with _RopeRep:: 8479 in ropeimpl.h 8480 * [275]17327 use of `enumeral_type' in template type unification 8481 * [276]17393 "unused variable '._0'" warning with -Wall 8482 * [277]17501 Confusion with member templates 8483 * [278]17537 g++ not passing -lstdc++ to linker when all command line 8484 arguments are libraries 8485 * [279]17585 usage of unqualified name of static member from within 8486 class not allowed 8487 * [280]17821 Poor diagnostic for using "." instead of "->" 8488 * [281]17829 wrong error: call of overloaded function is ambiguous 8489 * [282]17851 Misleading diagnostic for invalid function declarations 8490 with undeclared types 8491 * [283]17976 Destructor is called twice 8492 * [284]18020 rejects valid definition of enum value in template 8493 * [285]18093 bogus conflict in namespace aliasing 8494 * [286]18140 C++ parser bug when using >> in templates 8495 8496 Fortran 8497 8498 * [287]17541 data statements with double precision constants fail 8499 8500 x86-specific 8501 8502 * [288]17853 -O2 ICE for MMX testcase 8503 8504 SPARC-specific 8505 8506 * [289]17245 ICE compiling gsl-1.5 statistics/lag1.c 8507 8508 Darwin-specific 8509 8510 * [290]17167 FATAL:Symbol L_foo$stub already defined. 8511 8512 AIX-specific 8513 8514 * [291]17277 could not catch an exception when specified -maix64 8515 8516 Solaris-specific 8517 8518 * [292]17505 <cmath> calls acosf(), ceilf(), and other functions 8519 missing from system libraries 8520 8521 HP/UX specific: 8522 8523 * [293]17684 /usr/ccs/bin/ld: Can't create libgcc_s.sl 8524 8525 ARM-specific 8526 8527 * [294]17384 ICE with mode attribute on structures 8528 8529 MIPS-specific 8530 8531 * [295]17770 No NOP after LWL with -mips1 8532 8533 Other embedded target specific 8534 8535 * [296]11476 [arc-elf] gcc ICE on newlib's vfprintf.c 8536 * [297]14064 [avr-elf] -fdata-sections triggers ICE 8537 * [298]14678 [m68hc11-elf] gcc ICE 8538 * [299]15583 [powerpc-rtems] powerpc-rtems lacks __USE_INIT_FINI__ 8539 * [300]15790 [i686-coff] Alignment error building gcc with i686-coff 8540 target 8541 * [301]15886 [SH] Miscompilation with -O2 -fPIC 8542 * [302]16884 [avr-elf] [fweb related] bug while initializing 8543 variables 8544 8545 Bugs relating to debugger support 8546 8547 * [303]13841 missing debug info for _Complex function arguments 8548 * [304]15860 [big-endian targets] No DW_AT_location debug info is 8549 emitted for formal arguments to a function that uses "register" 8550 qualifiers 8551 8552 Testsuite issues (compiler not affected) 8553 8554 * [305]17465 Testsuite in libffi overrides LD_LIBRARY_PATH 8555 * [306]17469 Testsuite in libstdc++ overrides LD_LIBRARY_PATH 8556 * [307]18138 [mips-sgi-irix6.5] libgcc_s.so.1 not found by 64-bit 8557 testsuite 8558 8559 Documentation 8560 8561 * [308]15498 typo in gcc manual: non-existing locale example en_UK, 8562 should be en_GB 8563 * [309]15747 [mips-sgi-irix5.3] /bin/sh hangs during bootstrap: 8564 document broken shell 8565 * [310]16406 USE_LD_AS_NEEDED undocumented 8566 __________________________________________________________________ 8567 8568 GCC 3.4.4 8569 8570 This is the [311]list of problem reports (PRs) from GCC's bug tracking 8571 system that are known to be fixed in the 3.4.4 release. This list might 8572 not be complete (that is, it is possible that some PRs that have been 8573 fixed are not listed here). 8574 __________________________________________________________________ 8575 8576 GCC 3.4.5 8577 8578 This is the [312]list of problem reports (PRs) from GCC's bug tracking 8579 system that are known to be fixed in the 3.4.5 release. This list might 8580 not be complete (that is, it is possible that some PRs that have been 8581 fixed are not listed here). 8582 8583 Bootstrap issues 8584 8585 * [313]24688 sco_math fixincl breaks math.h 8586 8587 C compiler bugs 8588 8589 * [314]17188 struct Foo { } redefinition 8590 * [315]20187 wrong code for ((unsigned char)(unsigned long 8591 long)((a?a:1)&(a*b)))?0:1) 8592 * [316]21873 infinite warning loop on bad array initializer 8593 * [317]21899 enum definition accepts values to be overriden 8594 * [318]22061 ICE in find_function_data, in function.c 8595 * [319]22308 Failure to diagnose violation of constraint 6.516p2 8596 * [320]22458 ICE on missing brace 8597 * [321]22589 ICE casting to long long 8598 * [322]24101 Segfault with preprocessed source 8599 8600 C++ compiler and library bugs 8601 8602 * [323]10611 operations on vector mode not recognized in C++ 8603 * [324]13377 unexpected behavior of namespace usage directive 8604 * [325]16002 Strange error message with new parser 8605 * [326]17413 local classes as template argument 8606 * [327]17609 spurious error message after using keyword 8607 * [328]17618 ICE in cp_convert_to_pointer, in cp/cvt.c 8608 * [329]18124 ICE with invalid template template parameter 8609 * [330]18155 typedef in template declaration not rejected 8610 * [331]18177 ICE with const_cast for undeclared variable 8611 * [332]18368 C++ error message regression 8612 * [333]16378 ICE when returning a copy of a packed member 8613 * [334]18466 int ::i; accepted 8614 * [335]18512 ICE on invalid usage of template base class 8615 * [336]18454 ICE when returning undefined type 8616 * [337]18738 typename not allowed with non-dependent qualified name 8617 * [338]18803 rejects access to operator() in template 8618 * [339]19004 ICE in uses_template_parms, in cp/pt.c 8619 * [340]19208 Spurious error about variably modified type 8620 * [341]18253 bad error message / ICE for invalid template parameter 8621 * [342]19608 ICE after friend function definition in local class 8622 * [343]19884 ICE on explicit instantiation of a non-template 8623 constructor 8624 * [344]20153 ICE when C++ template function contains anonymous union 8625 * [345]20563 Infinite loop in diagnostic (and ice after error 8626 message) 8627 * [346]20789 ICE with incomplete type in template 8628 * [347]21336 Internal compiler error when using custom new operators 8629 * [348]21768 ICE in error message due to violation of coding 8630 conventions 8631 * [349]21853 constness of pointer to data member ignored 8632 * [350]21903 Default argument of template function causes a 8633 compile-time error 8634 * [351]21983 multiple diagnostics 8635 * [352]21987 New testsuite failure 8636 g++.dg/warn/conversion-function-1.C 8637 * [353]22153 ICE on invalid template specialization 8638 * [354]22172 Internal compiler error, seg fault. 8639 * [355]21286 filebuf::xsgetn vs pipes 8640 * [356]22233 ICE with wrong number of template parameters 8641 * [357]22508 ICE after invalid operator new 8642 * [358]22545 ICE with pointer to class member & user defined 8643 conversion operator 8644 * [359]23528 Wrong default allocator in ext/hash_map 8645 * [360]23550 char_traits requirements/1.cc test bad math 8646 * [361]23586 Bad diagnostic for invalid namespace-name 8647 * [362]23624 ICE in invert_truthvalue, in fold-const.c 8648 * [363]23639 Bad error message: not a member of '<declaration error>' 8649 * [364]23797 ICE on typename outside template 8650 * [365]23965 Bogus error message: no matching function for call to 8651 'foo(<type error>)' 8652 * [366]24052 &#`label_decl' not supported by dump_expr#<expression 8653 error> 8654 * [367]24580 virtual base class cause exception not to be caught 8655 8656 Problems in generated debug information 8657 8658 * [368]24267 Bad DWARF for altivec vectors 8659 8660 Optimizations issues 8661 8662 * [369]17810 ICE in verify_local_live_at_start 8663 * [370]17860 Wrong generated code for loop with varying bound 8664 * [371]21709 ICE on compile-time complex NaN 8665 * [372]21964 broken tail call at -O2 or more 8666 * [373]22167 Strange optimization bug when using -Os 8667 * [374]22619 Compilation failure for real_const_1.f and 8668 real_const_2.f90 8669 * [375]23241 Invalid code generated for comparison of uchar to 255 8670 * [376]23478 Miscompilation due to reloading of a var that is also 8671 used in EH pad 8672 * [377]24470 segmentation fault in cc1plus when compiling with -O 8673 * [378]24950 ICE in operand_subword_force 8674 8675 Precompiled headers problems 8676 8677 * [379]14400 Cannot compile qt-x11-free-3.3.0 8678 * [380]14940 PCH largefile test fails on various platforms 8679 8680 Preprocessor bugs 8681 8682 * [381]20239 ICE on empty preprocessed input 8683 * [382]15220 "gcc -E -MM -MG" reports missing system headers in 8684 source directory 8685 8686 Testsuite issues 8687 8688 * [383]19275 gcc.dg/20020919-1.c fails with -fpic/-fPIC on 8689 i686-pc-linux-gnu 8690 8691 Alpha specific 8692 8693 * [384]21888 bootstrap failure with linker relaxation enabled 8694 8695 ARM specific 8696 8697 * [385]15342 [arm-linux]: ICE in verify_local_live_at_start 8698 * [386]23985 Memory aliasing information incorrect in inlined memcpy 8699 8700 ColdFile specific 8701 8702 * [387]16719 Illegal move of byte into address register causes 8703 compiler to ICE 8704 8705 HPPA specific 8706 8707 * [388]21723 ICE while building libgfortran 8708 * [389]21841 -mhp-ld/-mgnu-ld documentation 8709 8710 IA-64 specific 8711 8712 * [390]23644 IA-64 hardware models and configuration options 8713 documentation error 8714 * [391]24718 Shared libgcc not used for linking by default 8715 8716 M68000 specific 8717 8718 * [392]18421 ICE in reload_cse_simplify_operands, in postreload.c 8719 8720 MIPS specific 8721 8722 * [393]20621 ICE in change_address_1, in emit-rtl.c 8723 8724 PowerPC and PowerPC64 specific 8725 8726 * [394]18583 error on valid code: const 8727 __attribute__((altivec(vector__))) doesn't work in arrays 8728 * [395]20191 ICE in reload_cse_simplify_operands 8729 * [396]22083 AIX: TARGET_C99_FUNCTIONS is wrongly defined 8730 * [397]23070 CALL_V4_CLEAR_FP_ARGS flag not properly set 8731 * [398]23404 gij trashes args of functions with more than 8 fp args 8732 * [399]23539 C & C++ compiler generating misaligned references 8733 regardless of compiler flags 8734 * [400]24102 floatdisf2_internal2 broken 8735 * [401]24465 -mminimal-toc miscompilation of __thread vars 8736 8737 Solaris specific 8738 8739 * [402]19933 Problem with define of HUGE_VAL in math_c99 8740 * [403]21889 Native Solaris assembler cannot grok DTP-relative debug 8741 symbols 8742 8743 SPARC specific 8744 8745 * [404]19300 PCH failures on sparc-linux 8746 * [405]20301 Assembler labels have a leading "-" 8747 * [406]20673 C PCH testsuite assembly comparison failure 8748 8749 x86 and x86_64 specific 8750 8751 * [407]18582 ICE with arrays of type V2DF 8752 * [408]19340 Compilation SEGFAULTs with -O1 -fschedule-insns2 8753 -fsched2-use-traces 8754 * [409]21716 ICE in reg-stack.c's swap_rtx_condition 8755 * [410]24315 amd64 fails -fpeephole2 8756 __________________________________________________________________ 8757 8758 GCC 3.4.6 8759 8760 This is the [411]list of problem reports (PRs) from GCC's bug tracking 8761 system that are known to be fixed in the 3.4.6 release. This list might 8762 not be complete (that is, it is possible that some PRs that have been 8763 fixed are not listed here). 8764 8765 8766 For questions related to the use of GCC, please consult these web 8767 pages and the [412]GCC manuals. If that fails, the 8768 [413]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 8769 web pages and the development of GCC are welcome on our developer 8770 list at [414]gcc (a] gcc.gnu.org. All of [415]our lists have public 8771 archives. 8772 8773 Copyright (C) [416]Free Software Foundation, Inc. Verbatim copying and 8774 distribution of this entire article is permitted in any medium, 8775 provided this notice is preserved. 8776 8777 These pages are [417]maintained by the GCC team. Last modified 8778 2014-06-28[418]. 8779 8780 References 8781 8782 1. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.6 8783 2. http://gcc.gnu.org/gcc-3.4/changes.html#cplusplus 8784 3. http://gcc.gnu.org/gcc-3.3/changes.html#obsolete_systems 8785 4. http://gcc.gnu.org/gcc-3.4/changes.html#obsolete_systems 8786 5. http://gcc.gnu.org/gcc-3.4/mips-abi.html 8787 6. http://gcc.gnu.org/gcc-3.4/sparc-abi.html 8788 7. http://www.boost.org/ 8789 8. https://gcc.gnu.org/PR11953 8790 9. https://gcc.gnu.org/PR8361 8791 10. https://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Other-Builtins.html#Other%20Builtins 8792 11. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#209 8793 12. http://gcc.gnu.org/bugs/#cxx_rvalbind 8794 13. https://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Objective-C-Dialect-Options.html 8795 14. https://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Objective-C-Dialect-Options.html 8796 15. https://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Objective-C-Dialect-Options.html 8797 16. 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https://gcc.gnu.org/onlinedocs/ 9194 413. mailto:gcc-help (a] gcc.gnu.org 9195 414. mailto:gcc (a] gcc.gnu.org 9196 415. https://gcc.gnu.org/lists.html 9197 416. http://www.fsf.org/ 9198 417. https://gcc.gnu.org/about.html 9199 418. http://validator.w3.org/check/referer 9200 ====================================================================== 9201 http://gcc.gnu.org/gcc-3.3/index.html 9202 9203 GCC 3.3 Release Series 9204 9205 May 03, 2005 9206 9207 The [1]GNU project and the GCC developers are pleased to announce the 9208 release of GCC 3.3.6. 9209 9210 This release is a bug-fix release, containing fixes for regressions in 9211 GCC 3.3.5 relative to previous releases of GCC. 9212 9213 This release is the last of the series 3.3.x. 9214 9215 The GCC 3.3 release series includes numerous [2]new features, 9216 improvements, bug fixes, and other changes, thanks to an [3]amazing 9217 group of volunteers. 9218 9219 Release History 9220 9221 GCC 3.3.6 9222 May 3, 2005 ([4]changes) 9223 9224 GCC 3.3.5 9225 September 30, 2004 ([5]changes) 9226 9227 GCC 3.3.4 9228 May 31, 2004 ([6]changes) 9229 9230 GCC 3.3.3 9231 February 14, 2004 ([7]changes) 9232 9233 GCC 3.3.2 9234 October 16, 2003 ([8]changes) 9235 9236 GCC 3.3.1 9237 August 8, 2003 ([9]changes) 9238 9239 GCC 3.3 9240 May 14, 2003 ([10]changes) 9241 9242 References and Acknowledgements 9243 9244 GCC used to stand for the GNU C Compiler, but since the compiler 9245 supports several other languages aside from C, it now stands for the 9246 GNU Compiler Collection. 9247 9248 A list of [11]successful builds is updated as new information becomes 9249 available. 9250 9251 The GCC developers would like to thank the numerous people that have 9252 contributed new features, improvements, bug fixes, and other changes as 9253 well as test results to GCC. This [12]amazing group of volunteers is 9254 what makes GCC successful. 9255 9256 For additional information about GCC please refer to the [13]GCC 9257 project web site or contact the [14]GCC development mailing list. 9258 9259 To obtain GCC please use [15]our mirror sites, or our CVS server. 9260 9261 9262 For questions related to the use of GCC, please consult these web 9263 pages and the [16]GCC manuals. If that fails, the 9264 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 9265 web pages and the development of GCC are welcome on our developer 9266 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 9267 archives. 9268 9269 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 9270 distribution of this entire article is permitted in any medium, 9271 provided this notice is preserved. 9272 9273 These pages are [21]maintained by the GCC team. Last modified 9274 2014-06-28[22]. 9275 9276 References 9277 9278 1. http://www.gnu.org/ 9279 2. http://gcc.gnu.org/gcc-3.3/changes.html 9280 3. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 9281 4. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.6 9282 5. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.5 9283 6. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.4 9284 7. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.3 9285 8. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.2 9286 9. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.1 9287 10. http://gcc.gnu.org/gcc-3.3/changes.html 9288 11. http://gcc.gnu.org/gcc-3.3/buildstat.html 9289 12. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 9290 13. http://gcc.gnu.org/index.html 9291 14. mailto:gcc (a] gcc.gnu.org 9292 15. http://gcc.gnu.org/mirrors.html 9293 16. https://gcc.gnu.org/onlinedocs/ 9294 17. mailto:gcc-help (a] gcc.gnu.org 9295 18. mailto:gcc (a] gcc.gnu.org 9296 19. https://gcc.gnu.org/lists.html 9297 20. http://www.fsf.org/ 9298 21. https://gcc.gnu.org/about.html 9299 22. http://validator.w3.org/check/referer 9300 ====================================================================== 9301 http://gcc.gnu.org/gcc-3.3/changes.html 9302 9303 GCC 3.3 Release Series 9304 Changes, New Features, and Fixes 9305 9306 The latest release in the 3.3 release series is [1]GCC 3.3.6. 9307 9308 Caveats 9309 9310 * The preprocessor no longer accepts multi-line string literals. They 9311 were deprecated in 3.0, 3.1, and 3.2. 9312 * The preprocessor no longer supports the -A- switch when appearing 9313 alone. -A- followed by an assertion is still supported. 9314 * Support for all the systems [2]obsoleted in GCC 3.1 has been 9315 removed from GCC 3.3. See below for a [3]list of systems which are 9316 obsoleted in this release. 9317 * Checking for null format arguments has been decoupled from the rest 9318 of the format checking mechanism. Programs which use the format 9319 attribute may regain this functionality by using the new [4]nonnull 9320 function attribute. Note that all functions for which GCC has a 9321 built-in format attribute, an appropriate built-in nonnull 9322 attribute is also applied. 9323 * The DWARF (version 1) debugging format has been deprecated and will 9324 be removed in a future version of GCC. Version 2 of the DWARF 9325 debugging format will continue to be supported for the foreseeable 9326 future. 9327 * The C and Objective-C compilers no longer accept the "Naming Types" 9328 extension (typedef foo = bar); it was already unavailable in C++. 9329 Code which uses it will need to be changed to use the "typeof" 9330 extension instead: typedef typeof(bar) foo. (We have removed this 9331 extension without a period of deprecation because it has caused the 9332 compiler to crash since version 3.0 and no one noticed until very 9333 recently. Thus we conclude it is not in widespread use.) 9334 * The -traditional C compiler option has been removed. It was 9335 deprecated in 3.1 and 3.2. (Traditional preprocessing remains 9336 available.) The <varargs.h> header, used for writing variadic 9337 functions in traditional C, still exists but will produce an error 9338 message if used. 9339 * GCC 3.3.1 automatically places zero-initialized variables in the 9340 .bss section on some operating systems. Versions of GNU Emacs up to 9341 (and including) 21.3 will not work correctly when using this 9342 optimization; you can use -fno-zero-initialized-in-bss to disable 9343 it. 9344 9345 General Optimizer Improvements 9346 9347 * A new scheme for accurately describing processor pipelines, the 9348 [5]DFA scheduler, has been added. 9349 * Pavel Nejedly, Charles University Prague, has contributed new file 9350 format used by the edge coverage profiler (-fprofile-arcs). 9351 The new format is robust and diagnoses common mistakes where 9352 profiles from different versions (or compilations) of the program 9353 are combined resulting in nonsensical profiles and slow code to 9354 produced with profile feedback. Additionally this format allows 9355 extra data to be gathered. Currently, overall statistics are 9356 produced helping optimizers to identify hot spots of a program 9357 globally replacing the old intra-procedural scheme and resulting in 9358 better code. Note that the gcov tool from older GCC versions will 9359 not be able to parse the profiles generated by GCC 3.3 and vice 9360 versa. 9361 * Jan Hubicka, SuSE Labs, has contributed a new superblock formation 9362 pass enabled using -ftracer. This pass simplifies the control flow 9363 of functions allowing other optimizations to do better job. 9364 He also contributed the function reordering pass 9365 (-freorder-functions) to optimize function placement using profile 9366 feedback. 9367 9368 New Languages and Language specific improvements 9369 9370 C/ObjC/C++ 9371 9372 * The preprocessor now accepts directives within macro arguments. It 9373 processes them just as if they had not been within macro arguments. 9374 * The separate ISO and traditional preprocessors have been completely 9375 removed. The front end handles either type of preprocessed output 9376 if necessary. 9377 * In C99 mode preprocessor arithmetic is done in the precision of the 9378 target's intmax_t, as required by that standard. 9379 * The preprocessor can now copy comments inside macros to the output 9380 file when the macro is expanded. This feature, enabled using the 9381 -CC option, is intended for use by applications which place 9382 metadata or directives inside comments, such as lint. 9383 * The method of constructing the list of directories to be searched 9384 for header files has been revised. If a directory named by a -I 9385 option is a standard system include directory, the option is 9386 ignored to ensure that the default search order for system 9387 directories and the special treatment of system header files are 9388 not defeated. 9389 * A few more [6]ISO C99 features now work correctly. 9390 * A new function attribute, nonnull, has been added which allows 9391 pointer arguments to functions to be specified as requiring a 9392 non-null value. The compiler currently uses this information to 9393 issue a warning when it detects a null value passed in such an 9394 argument slot. 9395 * A new type attribute, may_alias, has been added. Accesses to 9396 objects with types with this attribute are not subjected to 9397 type-based alias analysis, but are instead assumed to be able to 9398 alias any other type of objects, just like the char type. 9399 9400 C++ 9401 9402 * Type based alias analysis has been implemented for C++ aggregate 9403 types. 9404 9405 Objective-C 9406 9407 * Generate an error if Objective-C objects are passed by value in 9408 function and method calls. 9409 * When -Wselector is used, check the whole list of selectors at the 9410 end of compilation, and emit a warning if a @selector() is not 9411 known. 9412 * Define __NEXT_RUNTIME__ when compiling for the NeXT runtime. 9413 * No longer need to include objc/objc-class.h to compile self calls 9414 in class methods (NeXT runtime only). 9415 * New -Wundeclared-selector option. 9416 * Removed selector bloating which was causing object files to be 10% 9417 bigger on average (GNU runtime only). 9418 * Using at run time @protocol() objects has been fixed in certain 9419 situations (GNU runtime only). 9420 * Type checking has been fixed and improved in many situations 9421 involving protocols. 9422 9423 Java 9424 9425 * The java.sql and javax.sql packages now implement the JDBC 3.0 (JDK 9426 1.4) API. 9427 * The JDK 1.4 assert facility has been implemented. 9428 * The bytecode interpreter is now direct threaded and thus faster. 9429 9430 Fortran 9431 9432 * Fortran improvements are listed in [7]the Fortran documentation. 9433 9434 Ada 9435 9436 * Ada tasking now works with glibc 2.3.x threading libraries. 9437 9438 New Targets and Target Specific Improvements 9439 9440 * The following changes have been made to the HP-PA port: 9441 + The port now defaults to scheduling for the PA8000 series of 9442 processors. 9443 + Scheduling support for the PA7300 processor has been added. 9444 + The 32-bit port now supports weak symbols under HP-UX 11. 9445 + The handling of initializers and finalizers has been improved 9446 under HP-UX 11. The 64-bit port no longer uses collect2. 9447 + Dwarf2 EH support has been added to the 32-bit GNU/Linux port. 9448 + ABI fixes to correct the passing of small structures by value. 9449 * The SPARC, HP-PA, SH4, and x86/pentium ports have been converted to 9450 use the DFA processor pipeline description. 9451 * The following NetBSD configurations for the SuperH processor family 9452 have been added: 9453 + SH3, big-endian, sh-*-netbsdelf* 9454 + SH3, little-endian, shle-*-netbsdelf* 9455 + SH5, SHmedia, big-endian, 32-bit default, sh5-*-netbsd* 9456 + SH5, SHmedia, little-endian, 32-bit default, sh5le-*-netbsd* 9457 + SH5, SHmedia, big-endian, 64-bit default, sh64-*-netbsd* 9458 + SH5, SHmedia, little-endian, 64-bit default, sh64le-*-netbsd* 9459 * The following changes have been made to the IA-32/x86-64 port: 9460 + SSE2 and 3dNOW! intrinsics are now supported. 9461 + Support for thread local storage has been added to the IA-32 9462 and x86-64 ports. 9463 + The x86-64 port has been significantly improved. 9464 * The following changes have been made to the MIPS port: 9465 + All configurations now accept the -mabi switch. Note that you 9466 will need appropriate multilibs for this option to work 9467 properly. 9468 + ELF configurations will always pass an ABI flag to the 9469 assembler, except when the MIPS EABI is selected. 9470 + -mabi=64 no longer selects MIPS IV code. 9471 + The -mcpu option, which was deprecated in 3.1 and 3.2, has 9472 been removed from this release. 9473 + -march now changes the core ISA level. In previous releases, 9474 it would change the use of processor-specific extensions, but 9475 would leave the core ISA unchanged. For example, mips64-elf 9476 -march=r8000 will now generate MIPS IV code. 9477 + Under most configurations, -mipsN now acts as a synonym for 9478 -march. 9479 + There are some new preprocessor macros to describe the -march 9480 and -mtune settings. See the documentation of those options 9481 for details. 9482 + Support for the NEC VR-Series processors has been added. This 9483 includes the 54xx, 5500, and 41xx series. 9484 + Support for the Sandcraft sr71k processor has been added. 9485 * The following changes have been made to the S/390 port: 9486 + Support to build the Java runtime libraries has been added. 9487 Java is now enabled by default on s390-*-linux* and 9488 s390x-*-linux* targets. 9489 + Multilib support for the s390x-*-linux* target has been added; 9490 this allows to build 31-bit binaries using the -m31 option. 9491 + Support for thread local storage has been added. 9492 + Inline assembler code may now use the 'Q' constraint to 9493 specify memory operands without index register. 9494 + Various platform-specific performance improvements have been 9495 implemented; in particular, the compiler now uses the BRANCH 9496 ON COUNT family of instructions and makes more frequent use of 9497 the TEST UNDER MASK family of instructions. 9498 * The following changes have been made to the PowerPC port: 9499 + Support for IBM Power4 processor added. 9500 + Support for Motorola e500 SPE added. 9501 + Support for AIX 5.2 added. 9502 + Function and Data sections now supported on AIX. 9503 + Sibcall optimizations added. 9504 * The support for H8 Tiny is added to the H8/300 port with -mn. 9505 9506 Obsolete Systems 9507 9508 Support for a number of older systems has been declared obsolete in GCC 9509 3.3. Unless there is activity to revive them, the next release of GCC 9510 will have their sources permanently removed. 9511 9512 All configurations of the following processor architectures have been 9513 declared obsolete: 9514 * Matsushita MN10200, mn10200-*-* 9515 * Motorola 88000, m88k-*-* 9516 * IBM ROMP, romp-*-* 9517 9518 Also, some individual systems have been obsoleted: 9519 * Alpha 9520 + Interix, alpha*-*-interix* 9521 + Linux libc1, alpha*-*-linux*libc1* 9522 + Linux ECOFF, alpha*-*-linux*ecoff* 9523 * ARM 9524 + Generic a.out, arm*-*-aout* 9525 + Conix, arm*-*-conix* 9526 + "Old ABI," arm*-*-oabi 9527 + StrongARM/COFF, strongarm-*-coff* 9528 * HPPA (PA-RISC) 9529 + Generic OSF, hppa1.0-*-osf* 9530 + Generic BSD, hppa1.0-*-bsd* 9531 + HP/UX versions 7, 8, and 9, hppa1.[01]-*-hpux[789]* 9532 + HiUX, hppa*-*-hiux* 9533 + Mach Lites, hppa*-*-lites* 9534 * Intel 386 family 9535 + Windows NT 3.x, i?86-*-win32 9536 * MC68000 family 9537 + HP systems, m68000-hp-bsd* and m68k-hp-bsd* 9538 + Sun systems, m68000-sun-sunos*, m68k-sun-sunos*, and 9539 m68k-sun-mach* 9540 + AT&T systems, m68000-att-sysv* 9541 + Atari systems, m68k-atari-sysv* 9542 + Motorola systems, m68k-motorola-sysv* 9543 + NCR systems, m68k-ncr-sysv* 9544 + Plexus systems, m68k-plexus-sysv* 9545 + Commodore systems, m68k-cbm-sysv* 9546 + Citicorp TTI, m68k-tti-* 9547 + Unos, m68k-crds-unos* 9548 + Concurrent RTU, m68k-ccur-rtu* 9549 + Linux a.out, m68k-*-linux*aout* 9550 + Linux libc1, m68k-*-linux*libc1* 9551 + pSOS, m68k-*-psos* 9552 * MIPS 9553 + Generic ECOFF, mips*-*-ecoff* 9554 + SINIX, mips-sni-sysv4 9555 + Orion RTEMS, mips64orion-*-rtems* 9556 * National Semiconductor 32000 9557 + OpenBSD, ns32k-*-openbsd* 9558 * POWER (aka RS/6000) and PowerPC 9559 + AIX versions 1, 2, and 3, rs6000-ibm-aix[123]* 9560 + Bull BOSX, rs6000-bull-bosx 9561 + Generic Mach, rs6000-*-mach* 9562 + Generic SysV, powerpc*-*-sysv* 9563 + Linux libc1, powerpc*-*-linux*libc1* 9564 * Sun SPARC 9565 + Generic a.out, sparc-*-aout*, sparclet-*-aout*, 9566 sparclite-*-aout*, and sparc86x-*-aout* 9567 + NetBSD a.out, sparc-*-netbsd*aout* 9568 + Generic BSD, sparc-*-bsd* 9569 + ChorusOS, sparc-*-chorusos* 9570 + Linux a.out, sparc-*-linux*aout* 9571 + Linux libc1, sparc-*-linux*libc1* 9572 + LynxOS, sparc-*-lynxos* 9573 + Solaris on HAL hardware, sparc-hal-solaris2* 9574 + SunOS versions 3 and 4, sparc-*-sunos[34]* 9575 * NEC V850 9576 + RTEMS, v850-*-rtems* 9577 * VAX 9578 + VMS, vax-*-vms* 9579 9580 Documentation improvements 9581 9582 Other significant improvements 9583 9584 * Almost all front-end dependencies in the compiler have been 9585 separated out into a set of language hooks. This should make adding 9586 a new front end clearer and easier. 9587 * One effect of removing the separate preprocessor is a small 9588 increase in the robustness of the compiler in general, and the 9589 maintainability of target descriptions. Previously target-specific 9590 built-in macros and others, such as __FAST_MATH__, had to be 9591 handled with so-called specs that were hard to maintain. Often they 9592 would fail to behave properly when conflicting options were 9593 supplied on the command line, and define macros in the user's 9594 namespace even when strict ISO compliance was requested. 9595 Integrating the preprocessor has cleanly solved these issues. 9596 * The Makefile suite now supports redirection of make install by 9597 means of the variable DESTDIR. 9598 __________________________________________________________________ 9599 9600 GCC 3.3 9601 9602 Detailed release notes for the GCC 3.3 release follow. 9603 9604 Bug Fixes 9605 9606 bootstrap failures 9607 9608 * [8]10140 cross compiler build failures: missing __mempcpy (DUP: 9609 [9]10198,[10]10338) 9610 9611 Internal compiler errors (multi-platform) 9612 9613 * [11]3581 large string causes segmentation fault in cc1 9614 * [12]4382 __builtin_{set,long}jmp with -O3 can crash the compiler 9615 * [13]5533 (c++) ICE when processing std::accumulate(begin, end, 9616 init, invalid_op) 9617 * [14]6387 -fpic -gdwarf-2 -g1 combination gives ICE in dwarf2out 9618 * [15]6412 (c++) ICE in retrieve_specialization 9619 * [16]6620 (c++) partial template specialization causes an ICE 9620 (segmentation fault) 9621 * [17]6663 (c++) ICE with attribute aligned 9622 * [18]7068 ICE with incomplete types 9623 * [19]7083 (c++) ICE using -gstabs with dodgy class derivation 9624 * [20]7647 (c++) ICE when data member has the name of the enclosing 9625 class 9626 * [21]7675 ICE in fixup_var_refs_1 9627 * [22]7718 'complex' template instantiation causes ICE 9628 * [23]8116 (c++) ICE in member template function 9629 * [24]8358 (ada) Ada compiler accesses freed memory, crashes 9630 * [25]8511 (c++) ICE: (hopefully) reproducible cc1plus segmentation 9631 fault 9632 * [26]8564 (c++) ICE in find_function_data, in function.c 9633 * [27]8660 (c++) template overloading ICE in tsubst_expr, in cp/pt.c 9634 * [28]8766 (c++) ICE after failed initialization of static template 9635 variable 9636 * [29]8803 ICE in instantiate_virtual_regs_1, in function.c 9637 * [30]8846 (c++) ICE after diagnostic if fr_FR@euro locale is set 9638 * [31]8906 (c++) ICE (Segmentation fault) when parsing nested-class 9639 definition 9640 * [32]9216 (c++) ICE on missing template parameter 9641 * [33]9261 (c++) ICE in arg_assoc, in cp/decl2.c 9642 * [34]9263 (fortran) ICE caused by invalid PARAMETER in implied DO 9643 loop 9644 * [35]9429 (c++) ICE in template instantiation with a pointered new 9645 operator 9646 * [36]9516 Internal error when using a big array 9647 * [37]9600 (c++) ICE with typedefs in template class 9648 * [38]9629 (c++) virtual inheritance segfault 9649 * [39]9672 (c++) ICE: Error reporting routines re-entered 9650 * [40]9749 (c++) ICE in write_expression on invalid function 9651 prototype 9652 * [41]9794 (fortran) ICE: floating point exception during constant 9653 folding 9654 * [42]9829 (c++) Missing colon in nested namespace usage causes ICE 9655 * [43]9916 (c++) ICE with noreturn function in ?: statement 9656 * [44]9936 ICE with local function and variable-length 2d array 9657 * [45]10262 (c++) cc1plus crashes with large generated code 9658 * [46]10278 (c++) ICE in parser for invalid code 9659 * [47]10446 (c++) ICE on definition of nonexistent member function of 9660 nested class in a class template 9661 * [48]10451 (c++) ICE in grokdeclarator on spurious mutable 9662 declaration 9663 * [49]10506 (c++) ICE in build_new at cp/init.c with 9664 -fkeep-inline-functions and multiple inheritance 9665 * [50]10549 (c++) ICE in store_bit_field on bitfields that exceed the 9666 precision of the declared type 9667 9668 Optimization bugs 9669 9670 * [51]2001 Inordinately long compile times in reload CSE regs 9671 * [52]2391 Exponential compilation time explosion in combine 9672 * [53]2960 Duplicate loop conditions even with -Os 9673 * [54]4046 redundant conditional branch 9674 * [55]6405 Loop-unrolling related performance regressions 9675 * [56]6798 very long compile time with large case-statement 9676 * [57]6871 const objects shouldn't be moved to .bss 9677 * [58]6909 problem w/ -Os on modified loop-2c.c test case 9678 * [59]7189 gcc -O2 -Wall does not print ``control reaches end of 9679 non-void function'' warning 9680 * [60]7642 optimization problem with signbit() 9681 * [61]8634 incorrect code for inlining of memcpy under -O2 9682 * [62]8750 Cygwin prolog generation erroneously emitting __alloca as 9683 regular function call 9684 9685 C front end 9686 9687 * [63]2161 long if-else cascade overflows parser stack 9688 * [64]4319 short accepted on typedef'd char 9689 * [65]8602 incorrect line numbers in warning messages when using 9690 inline functions 9691 * [66]9177 -fdump-translation-unit: C front end deletes function_decl 9692 AST nodes and breaks debugging dumps 9693 * [67]9853 miscompilation of non-constant structure initializer 9694 9695 c++ compiler and library 9696 9697 * [68]45 legal template specialization code is rejected (DUP: 9698 [69]3784) 9699 * [70]764 lookup failure: friend operator and dereferencing a pointer 9700 and templates (DUP: [71]5116) 9701 * [72]2862 gcc accepts invalid explicit instantiation syntax (DUP: 9702 2863) 9703 * [73]3663 G++ doesn't check access control during template 9704 instantiation 9705 * [74]3797 gcc fails to emit explicit specialization of a template 9706 member 9707 * [75]3948 Two destructors are called when no copy destructor is 9708 defined (ABI change) 9709 * [76]4137 Conversion operator within template is not accepted 9710 * [77]4361 bogus ambiguity taking the address of a member template 9711 * [78]4802 g++ accepts illegal template code (access to private 9712 member; DUP: [79]5837) 9713 * [80]4803 inline function is used but never defined, and g++ does 9714 not object 9715 * [81]5094 Partial specialization cannot be friend? 9716 * [82]5730 complex<double>::norm() -- huge slowdown from egcs-2.91.66 9717 * [83]6713 Regression wrt 3.0.4: g++ -O2 leads to seg fault at run 9718 time 9719 * [84]7015 certain __asm__ constructs rejected 9720 * [85]7086 compile time regression (quadratic behavior in 9721 fixup_var_refs) 9722 * [86]7099 G++ doesn't set the noreturn attribute on std::exit and 9723 std::abort 9724 * [87]7247 copy constructor missing when inlining enabled (invalid 9725 optimization?) 9726 * [88]7441 string array initialization compilation time regression 9727 from seconds to minutes 9728 * [89]7768 __PRETTY_FUNCTION__ for template destructor is wrong 9729 * [90]7804 bad printing of floating point constant in warning message 9730 * [91]8099 Friend classes and template specializations 9731 * [92]8117 member function pointers and multiple inheritance 9732 * [93]8205 using declaration and multiple inheritance 9733 * [94]8645 unnecessary non-zero checks in stl_tree.h 9734 * [95]8724 explicit destructor call for incomplete class allowed 9735 * [96]8805 compile time regression with many member variables 9736 * [97]8691 -O3 and -fno-implicit-templates are incompatible 9737 * [98]8700 unhelpful error message for binding temp to reference 9738 * [99]8724 explicit destructor call for incomplete class allowed 9739 * [100]8949 numeric_limits<>::denorm_min() and is_iec559 problems 9740 * [101]9016 Failure to consistently constant fold "constant" C++ 9741 objects 9742 * [102]9053 g++ confused about ambiguity of overloaded function 9743 templates 9744 * [103]9152 undefined virtual thunks 9745 * [104]9182 basic_filebuf<> does not report errors in codecvt<>::out 9746 * [105]9297 data corruption due to codegen bug (when copying.) 9747 * [106]9318 i/ostream::operator>>/<<(streambuf*) broken 9748 * [107]9320 Incorrect usage of traits_type::int_type in stdio_filebuf 9749 * [108]9400 bogus -Wshadow warning: shadowed declaration of this in 9750 local classes 9751 * [109]9424 i/ostream::operator>>/<<(streambuf*) drops characters 9752 * [110]9425 filebuf::pbackfail broken (DUP: [111]9439) 9753 * [112]9474 GCC freezes in compiling a weird code mixing <iostream> 9754 and <iostream.h> 9755 * [113]9548 Incorrect results from setf(ios::fixed) and precision(-1) 9756 [114][DR 231] 9757 * [115]9555 ostream inserters fail to set badbit on exception 9758 * [116]9561 ostream inserters rethrow exception of wrong type 9759 * [117]9563 ostream::sentry returns true after a failed preparation 9760 * [118]9582 one-definition rule violation in std::allocator 9761 * [119]9622 __PRETTY_FUNCTION__ incorrect in template destructors 9762 * [120]9683 bug in initialization chains for static const variables 9763 from template classes 9764 * [121]9791 -Woverloaded-virtual reports hiding of destructor 9765 * [122]9817 collate::compare doesn't handle nul characters 9766 * [123]9825 filebuf::sputbackc breaks sbumpc 9767 * [124]9826 operator>>(basic_istream, basic_string) fails to compile 9768 with custom traits 9769 * [125]9924 Multiple using statements for builtin functions not 9770 allowed 9771 * [126]9946 destructor is not called for temporary object 9772 * [127]9964 filebuf::close() sometimes fails to close file 9773 * [128]9988 filebuf::overflow writes EOF to file 9774 * [129]10033 optimization breaks polymorphic references w/ typeid 9775 operator 9776 * [130]10097 filebuf::underflow drops characters 9777 * [131]10132 filebuf destructor can throw exceptions 9778 * [132]10180 gcc fails to warn about non-inlined function 9779 * [133]10199 method parametrized by template does not work everywhere 9780 * [134]10300 use of array-new (nothrow) in segfaults on NULL return 9781 * [135]10427 Stack corruption with variable-length automatic arrays 9782 and virtual destructors 9783 * [136]10503 Compilation never stops in fixed_type_or_null 9784 9785 Objective-C 9786 9787 * [137]5956 selectors aren't matched properly when added to the 9788 selector table 9789 9790 Fortran compiler and library 9791 9792 * [138]1832 list directed i/o overflow hangs, -fbounds-check doesn't 9793 detect 9794 * [139]3924 g77 generates code that is rejected by GAS if COFF debug 9795 info requested 9796 * [140]5634 doc: explain that configure --prefix=~/... does not work 9797 * [141]6367 multiple repeat counts confuse namelist read into array 9798 * [142]6491 Logical operations error on logicals when using 9799 -fugly-logint 9800 * [143]6742 Generation of C++ Prototype for FORTRAN and extern "C" 9801 * [144]7113 Failure of g77.f-torture/execute/f90-intrinsic-bit.f -Os 9802 on irix6.5 9803 * [145]7236 OPEN(...,RECL=nnn,...) without ACCESS='DIRECT' should 9804 assume a direct access file 9805 * [146]7278 g77 "bug"; the executable misbehaves (with -O2 9806 -fno-automatic) 9807 * [147]7384 DATE_AND_TIME milliseconds field inactive on Windows 9808 * [148]7388 Incorrect output with 0-based array of characters 9809 * [149]8587 Double complex zero ** double precision number -> NaN 9810 instead of zero 9811 * [150]9038 -ffixed-line-length-none -x f77-cpp-input gives: Warning: 9812 unknown register name line-length-none 9813 * [151]10197 Direct access files not unformatted by default 9814 9815 Java compiler and library 9816 9817 * [152]6005 gcj fails to build rhug on alpha 9818 * [153]6389 System.getProperty("") should always throw an 9819 IllegalArgumentException 9820 * [154]6576 java.util.ResourceBundle.getResource ignores locale 9821 * [155]6652 new java.io.File("").getCanonicalFile() throws exception 9822 * [156]7060 getMethod() doesn't search super interface 9823 * [157]7073 bytecode interpreter gives wrong answer for interface 9824 getSuperclass() 9825 * [158]7180 possible bug in 9826 javax.naming.spi.NamingManager.getPlusPath() 9827 * [159]7416 java.security startup refs "GNU libgcj.security" 9828 * [160]7570 Runtime.exec with null envp: child doesn't inherit parent 9829 env (DUP: [161]7578) 9830 * [162]7611 Internal error while compiling libjava with -O 9831 * [163]7709 NullPointerException in _Jv_ResolvePoolEntry 9832 * [164]7766 ZipInputStream.available returns 0 immediately after 9833 construction 9834 * [165]7785 Calendar.getTimeInMillis/setTimeInMillis should be public 9835 * [166]7786 TimeZone.getDSTSavings() from JDK1.4 not implemented 9836 * [167]8142 '$' in class names vs. dlopen 'dynamic string tokens' 9837 * [168]8234 ZipInputStream chokes when InputStream.read() returns 9838 small chunks 9839 * [169]8415 reflection bug: exception info for Method 9840 * [170]8481 java.Random.nextInt(int) may return negative 9841 * [171]8593 Error reading GZIPped files with BufferedReader 9842 * [172]8759 java.beans.Introspector has no flushCaches() or 9843 flushFromCaches() methods 9844 * [173]8997 spin() calls Thread.sleep 9845 * [174]9253 on win32, java.io.File.listFiles("C:\\") returns pwd 9846 instead of the root content of C: 9847 * [175]9254 java::lang::Object::wait(), threads-win32.cc returns 9848 wrong return codes 9849 * [176]9271 Severe bias in java.security.SecureRandom 9850 9851 Ada compiler and library 9852 9853 * [177]6767 make gnatlib-shared fails on -laddr2line 9854 * [178]9911 gnatmake fails to link when GCC configured with 9855 --with-sjlj-exceptions=yes 9856 * [179]10020 Can't bootstrap gcc on AIX with Ada enabled 9857 * [180]10546 Ada tasking not working on Red Hat 9 9858 9859 preprocessor 9860 9861 * [181]7029 preprocessor should ignore #warning with -M 9862 9863 ARM-specific 9864 9865 * [182]2903 [arm] Optimization bug with long long arithmetic 9866 * [183]7873 arm-linux-gcc fails when assigning address to a bit field 9867 9868 FreeBSD-specific 9869 9870 * [184]7680 float functions undefined in math.h/cmath with #define 9871 _XOPEN_SOURCE 9872 9873 HP-UX or HP-PA-specific 9874 9875 * [185]8705 [HP-PA] ICE in emit_move_insn_1, in expr.c 9876 * [186]9986 [HP-UX] Incorrect transformation of fputs_unlocked to 9877 fputc_unlocked 9878 * [187]10056 [HP-PA] ICE at -O2 when building c++ code from doxygen 9879 9880 m68hc11-specific 9881 9882 * [188]6744 Bad assembler code generated: reference to pseudo 9883 register z 9884 * [189]7361 Internal compiler error in reload_cse_simplify_operands, 9885 in reload1.c 9886 9887 MIPS-specific 9888 9889 * [190]9496 [mips-linux] bug in optimizer? 9890 9891 PowerPC-specific 9892 9893 * [191]7067 -Os with -mcpu=powerpc optimizes for speed (?) instead of 9894 space 9895 * [192]8480 reload ICEs for LAPACK code on powerpc64-linux 9896 * [193]8784 [AIX] Internal compiler error in simplify_gen_subreg 9897 * [194]10315 [powerpc] ICE: in extract_insn, in recog.c 9898 9899 SPARC-specific 9900 9901 * [195]10267 (documentation) Wrong build instructions for 9902 *-*-solaris2* 9903 9904 x86-specific (Intel/AMD) 9905 9906 * [196]7916 ICE in instantiate_virtual_register_1 9907 * [197]7926 (c++) i486 instructions in header files make c++ programs 9908 crash on i386 9909 * [198]8555 ICE in gen_split_1231 9910 * [199]8994 ICE with -O -march=pentium4 9911 * [200]9426 ICE with -fssa -funroll-loops -fprofile-arcs 9912 * [201]9806 ICE in inline assembly with -fPIC flag 9913 * [202]10077 gcc -msse2 generates movd to move dwords between xmm 9914 regs 9915 * [203]10233 64-bit comparison only comparing bottom 32-bits 9916 * [204]10286 type-punning doesn't work with __m64 and -O 9917 * [205]10308 [x86] ICE with -O -fgcse or -O2 9918 __________________________________________________________________ 9919 9920 GCC 3.3.1 9921 9922 Bug Fixes 9923 9924 This section lists the problem reports (PRs) from GCC's bug tracking 9925 system that are known to be fixed in the 3.3.1 release. This list might 9926 not be complete (that is, it is possible that some PRs that have been 9927 fixed are not listed here). 9928 9929 Bootstrap failures 9930 9931 * [206]11272 [Solaris] make bootstrap fails while building libstdc++ 9932 9933 Internal compiler errors (multi-platform) 9934 9935 * [207]5754 ICE on invalid nested template class 9936 * [208]6597 ICE in set_mem_alias_set compiling Qt with -O2 on ia64 9937 and --enable-checking 9938 * [209]6949 (c++) ICE in tsubst_decl, in cp/pt.c 9939 * [210]7053 (c++) ICE when declaring a function already defined as a 9940 friend method of a template class 9941 * [211]8164 (c++) ICE when using different const expressions as 9942 template parameter 9943 * [212]8384 (c++) ICE in is_base_type, in dwarf2out.c 9944 * [213]9559 (c++) ICE with invalid initialization of a static const 9945 * [214]9649 (c++) ICE in finish_member_declaration, in cp/semantics.c 9946 when redeclaring a static member variable 9947 * [215]9864 (fortran) ICE in add_abstract_origin_attribute, in 9948 dwarfout.c with -g -O -finline-functions 9949 * [216]10432 (c++) ICE in poplevel, in cp/decl.c 9950 * [217]10475 ICE in subreg_highpart_offset for code with long long 9951 * [218]10635 (c++) ICE when dereferencing an incomplete type casted 9952 from a void pointer 9953 * [219]10661 (c++) ICE in instantiate_decl, in cp/pt.c while 9954 instantiating static member variables 9955 * [220]10700 ICE in copy_to_mode_reg on 64-bit targets 9956 * [221]10712 (c++) ICE in constructor_name_full, in cp/decl2.c 9957 * [222]10796 (c++) ICE when defining an enum with two values: -1 and 9958 MAX_INT_64BIT 9959 * [223]10890 ICE in merge_assigned_reloads building Linux 2.4.2x 9960 sched.c 9961 * [224]10939 (c++) ICE with template code 9962 * [225]10956 (c++) ICE when specializing a template member function 9963 of a template class, in tsubst, in cp/pt.c 9964 * [226]11041 (c++) ICE: const myclass &x = *x; (when operator*() 9965 defined) 9966 * [227]11059 (c++) ICE with empty union 9967 * [228]11083 (c++) ICE in commit_one_edge_insertion, in cfgrtl.c with 9968 -O2 -fnon-call-exceptions 9969 * [229]11105 (c++) ICE in mangle_conv_op_name_for_type 9970 * [230]11149 (c++) ICE on error when instantiation with call function 9971 of a base type 9972 * [231]11228 (c++) ICE on new-expression using array operator new and 9973 default-initialization 9974 * [232]11282 (c++) Infinite memory usage after syntax error 9975 * [233]11301 (fortran) ICE with -fno-globals 9976 * [234]11308 (c++) ICE when using an enum type name as if it were a 9977 class or namespace 9978 * [235]11473 (c++) ICE with -gstabs when empty struct inherits from 9979 an empty struct 9980 * [236]11503 (c++) ICE when instantiating template with ADDR_EXPR 9981 * [237]11513 (c++) ICE in push_template_decl_real, in cp/pt.c: 9982 template member functions 9983 9984 Optimization bugs 9985 9986 * [238]11198 -O2 -frename-registers generates wrong code (aliasing 9987 problem) 9988 * [239]11304 Wrong code production with -fomit-frame-pointer 9989 * [240]11381 volatile memory access optimized away 9990 * [241]11536 [strength-reduce] -O2 optimization produces wrong code 9991 * [242]11557 constant folding bug generates wrong code 9992 9993 C front end 9994 9995 * [243]5897 No warning for statement after return 9996 * [244]11279 DWARF-2 output mishandles large enums 9997 9998 Preprocessor bugs 9999 10000 * [245]11022 no warning for non-compatible macro redefinition 10001 10002 C++ compiler and library 10003 10004 * [246]2330 static_cast<>() to a private base is allowed 10005 * [247]5388 Incorrect message "operands to ?: have different types" 10006 * [248]5390 Libiberty fails to demangle multi-digit template 10007 parameters 10008 * [249]7877 Incorrect parameter passing to specializations of member 10009 function templates 10010 * [250]9393 Anonymous namespaces and compiling the same file twice 10011 * [251]10032 -pedantic converts some errors to warnings 10012 * [252]10468 const typeof(x) is non-const, but only in templates 10013 * [253]10527 confused error message with "new int()" parameter 10014 initializer 10015 * [254]10679 parameter MIN_INLINE_INSNS is not honored 10016 * [255]10682 gcc chokes on a typedef for an enum inside a class 10017 template 10018 * [256]10689 pow(std::complex(0),1/3) returns (nan, nan) instead of 10019 0. 10020 * [257]10845 template member function (with nested template as 10021 parameter) cannot be called anymore if another unrelated template 10022 member function is defined 10023 * [258]10849 Cannot define an out-of-class specialization of a 10024 private nested template class 10025 * [259]10888 Suppress -Winline warnings for system headers 10026 * [260]10929 -Winline warns about functions for which no definition 10027 is visible 10028 * [261]10931 valid conversion static_cast<const unsigned 10029 int&>(lvalue-of-type-int) is rejected 10030 * [262]10940 Bad code with explicit specialization 10031 * [263]10968 If member function implicitly instantiated, explicit 10032 instantiation of class fails to instantiate it 10033 * [264]10990 Cannot convert with dynamic_cast<> to a private base 10034 class from within a member function 10035 * [265]11039 Bad interaction between implicit typename deprecation 10036 and friendship 10037 * [266]11062 (libstdc++) avoid __attribute__ ((unused)); say 10038 "__unused__" instead 10039 * [267]11095 C++ iostream manipulator causes segfault when called 10040 with negative argument 10041 * [268]11098 g++ doesn't emit complete debugging information for 10042 local variables in destructors 10043 * [269]11137 GNU/Linux shared library constructors not called unless 10044 there's one global object 10045 * [270]11154 spurious ambiguity report for template class 10046 specialization 10047 * [271]11329 Compiler cannot find user defined implicit typecast 10048 * [272]11332 Spurious error with casts in ?: expression 10049 * [273]11431 static_cast behavior with subclasses when default 10050 constructor available 10051 * [274]11528 money_get facet does not accept "$.00" as valid 10052 * [275]11546 Type lookup problems in out-of-line definition of a 10053 class doubly nested from a template class 10054 * [276]11567 C++ code containing templated member function with same 10055 name as pure virtual member function results in linking failure 10056 * [277]11645 Failure to deal with using and private inheritance 10057 10058 Java compiler and library 10059 10060 * [278]5179 Qualified static field access doesn't initialize its 10061 class 10062 * [279]8204 gcj -O2 to native reorders certain instructions 10063 improperly 10064 * [280]10838 java.io.ObjectInputStream syntax error 10065 * [281]10886 The RMI registry that comes with GCJ does not work 10066 correctly 10067 * [282]11349 JNDI URL context factories not located correctly 10068 10069 x86-specific (Intel/AMD) 10070 10071 * [283]4823 ICE on inline assembly code 10072 * [284]8878 miscompilation with -O and SSE 10073 * [285]9815 (c++ library) atomicity.h - fails to compile with -O3 10074 -masm=intel 10075 * [286]10402 (inline assembly) [x86] ICE in merge_assigned_reloads, 10076 in reload1.c 10077 * [287]10504 ICE with SSE2 code and -O3 -mcpu=pentium4 -msse2 10078 * [288]10673 ICE for x86-64 on freebsd libc vfprintf.c source 10079 * [289]11044 [x86] out of range loop instructions for FP code on K6 10080 * [290]11089 ICE: instantiate_virtual_regs_lossage while using SSE 10081 built-ins 10082 * [291]11420 [x86_64] gcc generates invalid asm code when "-O -fPIC" 10083 is used 10084 10085 SPARC- or Solaris- specific 10086 10087 * [292]9362 solaris 'as' dies when fed .s and "-gstabs" 10088 * [293]10142 [SPARC64] gcc produces wrong code when passing 10089 structures by value 10090 * [294]10663 New configure check aborts with Sun tools. 10091 * [295]10835 combinatorial explosion in scheduler on HyperSPARC 10092 * [296]10876 ICE in calculate_giv_inc when building KDE 10093 * [297]10955 wrong code at -O3 for structure argument in context of 10094 structure return 10095 * [298]11018 -mcpu=ultrasparc busts tar-1.13.25 10096 * [299]11556 [sparc64] ICE in gen_reg_rtx() while compiling 2.6.x 10097 Linux kernel 10098 10099 ia64 specific 10100 10101 * [300]10907 gcc violates the ia64 ABI (GP must be preserved) 10102 * [301]11320 scheduler bug (in machine depended reorganization pass) 10103 * [302]11599 bug with conditional and __builtin_prefetch 10104 10105 PowerPC specific 10106 10107 * [303]9745 [powerpc] gcc mis-compiles libmcrypt (alias problem 10108 during loop) 10109 * [304]10871 error in rs6000_stack_info save_size computation 10110 * [305]11440 gcc mis-compiles c++ code (libkhtml) with -O2, -fno-gcse 10111 cures it 10112 10113 m68k-specific 10114 10115 * [306]7594 [m68k] ICE on legal code associated with simplify-rtx 10116 * [307]10557 [m68k] ICE in subreg_offset_representable_p 10117 * [308]11054 [m68k] ICE in reg_overlap_mentioned_p 10118 10119 ARM-specific 10120 10121 * [309]10834 [arm] GCC 3.3 still generates incorrect instructions for 10122 functions with __attribute__ ((interrupt ("IRQ"))) 10123 * [310]10842 [arm] Clobbered link register is copied to pc under 10124 certain circumstances 10125 * [311]11052 [arm] noce_process_if_block() can lose REG_INC notes 10126 * [312]11183 [arm] ICE in change_address_1 (3.3) / subreg_hard_regno 10127 (3.4) 10128 10129 MIPS-specific 10130 10131 * [313]11084 ICE in propagate_one_insn, in flow.c 10132 10133 SH-specific 10134 10135 * [314]10331 can't compile c++ part of gcc cross compiler for sh-elf 10136 * [315]10413 [SH] ICE in reload_cse_simplify_operands, in reload1.c 10137 * [316]11096 i686-linux to sh-linux cross compiler fails to compile 10138 C++ files 10139 10140 GNU/Linux (or Hurd?) specific 10141 10142 * [317]2873 Bogus fixinclude of stdio.h from glibc 2.2.3 10143 10144 UnixWare specific 10145 10146 * [318]3163 configure bug: gcc/aclocal.m4 mmap test fails on UnixWare 10147 7.1.1 10148 10149 Cygwin (or mingw) specific 10150 10151 * [319]5287 ICE with dllimport attribute 10152 * [320]10148 [MingW/CygWin] Compiler dumps core 10153 10154 DJGPP specific 10155 10156 * [321]8787 GCC fails to emit .intel_syntax when invoked with 10157 -masm=intel on DJGPP 10158 10159 Darwin (and MacOS X) specific 10160 10161 * [322]10900 trampolines crash 10162 10163 Documentation 10164 10165 * [323]1607 (c++) Format attributes on methods undocumented 10166 * [324]4252 Invalid option `-fdump-translation-unit' 10167 * [325]4490 Clarify restrictions on -m96bit-long-double, 10168 -m128bit-long-double 10169 * [326]10355 document an issue with regparm attribute on some systems 10170 (e.g. Solaris) 10171 * [327]10726 (fortran) Documentation for function "IDate Intrinsic 10172 (Unix)" is wrong 10173 * [328]10805 document bug in old version of Sun assembler 10174 * [329]10815 warn against GNU binutils on AIX 10175 * [330]10877 document need for newer binutils on i?86-*-linux-gnu 10176 * [331]11280 Manual incorrect with respect to -freorder-blocks 10177 * [332]11466 Document -mlittle-endian and its restrictions for the 10178 sparc64 port 10179 10180 Testsuite bugs (compiler itself is not affected) 10181 10182 * [333]10737 newer bison causes g++.dg/parse/crash2.C to incorrectly 10183 report failure 10184 * [334]10810 gcc-3.3 fails make check: buffer overrun in 10185 test_demangle.c 10186 __________________________________________________________________ 10187 10188 GCC 3.3.2 10189 10190 Bug Fixes 10191 10192 This section lists the problem reports (PRs) from GCC's bug tracker 10193 that are known to be fixed in the 3.3.2 release. This list might not be 10194 complete (that is, it is possible that some PRs that have been fixed 10195 are not listed here). 10196 10197 Bootstrap failures and problems 10198 10199 * [335]8336 [SCO5] bootstrap config still tries to use COFF options 10200 * [336]9330 [alpha-osf] Bootstrap failure on Compaq Tru64 with 10201 --enable-threads=posix 10202 * [337]9631 [hppa64-linux] gcc-3.3 fails to bootstrap 10203 * [338]9877 fixincludes makes a bad sys/byteorder.h on svr5 (UnixWare 10204 7.1.1) 10205 * [339]11687 xstormy16-elf build fails in libf2c 10206 * [340]12263 [SGI IRIX] bootstrap fails during compile of 10207 libf2c/libI77/backspace.c 10208 * [341]12490 buffer overflow in scan-decls.c (during Solaris 9 10209 fix-header processing) 10210 10211 Internal compiler errors (multi-platform) 10212 10213 * [342]7277 Casting integers to vector types causes ICE 10214 * [343]7939 (c++) ICE on invalid function template specialization 10215 * [344]11063 (c++) ICE on parsing initialization list of const array 10216 member 10217 * [345]11207 ICE with negative index in array element designator 10218 * [346]11522 (fortran) g77 dwarf-2 ICE in 10219 add_abstract_origin_attribute 10220 * [347]11595 (c++) ICE on duplicate label definition 10221 * [348]11646 (c++) ICE in commit_one_edge_insertion with 10222 -fnon-call-exceptions -fgcse -O 10223 * [349]11665 ICE in struct initializer when taking address 10224 * [350]11852 (c++) ICE with bad struct initializer. 10225 * [351]11878 (c++) ICE in cp_expr_size 10226 * [352]11883 ICE with any -O on mercury-generated C code 10227 * [353]11991 (c++) ICE in cxx_incomplete_type_diagnostic, in 10228 cp/typeck2.c when applying typeid operator to template template 10229 parameter 10230 * [354]12146 ICE in lookup_template_function, in cp/pt.c 10231 * [355]12215 ICE in make_label_edge with -fnon-call-exceptions 10232 -fno-gcse -O2 10233 * [356]12369 (c++) ICE with templates and friends 10234 * [357]12446 ICE in emit_move_insn on complicated array reference 10235 * [358]12510 ICE in final_scan_insn 10236 * [359]12544 ICE with large parameters used in nested functions 10237 10238 C and optimization bugs 10239 10240 * [360]9862 spurious warnings with -W -finline-functions 10241 * [361]10962 lookup_field is a linear search on a linked list (can be 10242 slow if large struct) 10243 * [362]11370 -Wunreachable-code gives false complaints 10244 * [363]11637 invalid assembly with -fnon-call-exceptions 10245 * [364]11885 Problem with bitfields in packed structs 10246 * [365]12082 Inappropriate unreachable code warnings 10247 * [366]12180 Inline optimization fails for variadic function 10248 * [367]12340 loop unroller + gcse produces wrong code 10249 10250 C++ compiler and library 10251 10252 * [368]3907 nested template parameter collides with member name 10253 * [369]5293 confusing message when binding a temporary to a reference 10254 * [370]5296 [DR115] Pointers to functions and to template functions 10255 behave differently in deduction 10256 * [371]7939 ICE on function template specialization 10257 * [372]8656 Unable to assign function with __attribute__ and pointer 10258 return type to an appropriate variable 10259 * [373]10147 Confusing error message for invalid template function 10260 argument 10261 * [374]11400 std::search_n() makes assumptions about Size parameter 10262 * [375]11409 issues with using declarations, overloading, and 10263 built-in functions 10264 * [376]11740 ctype<wchar_t>::do_is(mask, wchar_t) doesn't handle 10265 multiple bits in mask 10266 * [377]11786 operator() call on variable in other namespace not 10267 recognized 10268 * [378]11867 static_cast ignores ambiguity 10269 * [379]11928 bug with conversion operators that are typedefs 10270 * [380]12114 Uninitialized memory accessed in dtor 10271 * [381]12163 static_cast + explicit constructor regression 10272 * [382]12181 Wrong code with comma operator and c++ 10273 * [383]12236 regparm and fastcall messes up parameters 10274 * [384]12266 incorrect instantiation of unneeded template during 10275 overload resolution 10276 * [385]12296 istream::peek() doesn't set eofbit 10277 * [386]12298 [sjlj exceptions] Stack unwind destroys 10278 not-yet-constructed object 10279 * [387]12369 ICE with templates and friends 10280 * [388]12337 apparently infinite loop in g++ 10281 * [389]12344 stdcall attribute ignored if function returns a pointer 10282 * [390]12451 missing(late) class forward declaration in cxxabi.h 10283 * [391]12486 g++ accepts invalid use of a qualified name 10284 10285 x86 specific (Intel/AMD) 10286 10287 * [392]8869 [x86 MMX] ICE with const variable optimization and MMX 10288 builtins 10289 * [393]9786 ICE in fixup_abnormal_edges with -fnon-call-exceptions 10290 -O2 10291 * [394]11689 g++3.3 emits un-assembleable code for k6 architecture 10292 * [395]12116 [k6] Invalid assembly output values with X-MAME code 10293 * [396]12070 ICE converting between double and long double with 10294 -msoft-float 10295 10296 ia64-specific 10297 10298 * [397]11184 [ia64 hpux] ICE on __builtin_apply building libobjc 10299 * [398]11535 __builtin_return_address may not work on ia64 10300 * [399]11693 [ia64] ICE in gen_nop_type 10301 * [400]12224 [ia64] Thread-local storage doesn't work 10302 10303 PowerPC-specific 10304 10305 * [401]11087 [powerpc64-linux] GCC miscompiles raid1.c from linux 10306 kernel 10307 * [402]11319 loop miscompiled on ppc32 10308 * [403]11949 ICE Compiler segfault with ffmpeg -maltivec code 10309 10310 SPARC-specific 10311 10312 * [404]11662 wrong code for expr. with cast to long long and 10313 exclusive or 10314 * [405]11965 invalid assembler code for a shift < 32 operation 10315 * [406]12301 (c++) stack corruption when a returned expression throws 10316 an exception 10317 10318 Alpha-specific 10319 10320 * [407]11717 [alpha-linux] unrecognizable insn compiling for.c of 10321 kernel 2.4.22-pre8 10322 10323 HPUX-specific 10324 10325 * [408]11313 problem with #pragma weak and static inline functions 10326 * [409]11712 __STDC_EXT__ not defined for C++ by default anymore? 10327 10328 Solaris specific 10329 10330 * [410]12166 Profiled programs crash if PROFDIR is set 10331 10332 Solaris-x86 specific 10333 10334 * [411]12101 i386 Solaris no longer works with GNU as? 10335 10336 Miscellaneous embedded target-specific bugs 10337 10338 * [412]10988 [m32r-elf] wrong blockmove code with -O3 10339 * [413]11805 [h8300-unknown-coff] [H8300] ICE for simple code with 10340 -O2 10341 * [414]11902 [sh4] spec file improperly inserts rpath even when none 10342 needed 10343 * [415]11903 [sh4] -pthread fails to link due to error in spec file 10344 on sh4 10345 __________________________________________________________________ 10346 10347 GCC 3.3.3 10348 10349 Minor features 10350 10351 In addition to the bug fixes documented below, this release contains 10352 few minor features such as: 10353 * Support for --with-sysroot 10354 * Support for automatic detection of executable stacks 10355 * Support for SSE3 instructions 10356 * Support for thread local storage debugging under GDB on S390 10357 10358 Bug Fixes 10359 10360 This section lists the problem reports (PRs) from GCC's bug tracker 10361 that are known to be fixed in the 3.3.3 release. This list might not be 10362 complete (that is, it is possible that some PRs that have been fixed 10363 are not listed here). 10364 10365 Bootstrap failures and issues 10366 10367 * [416]11890 Building cross gcc-3.3.1 for sparc-sun-solaris2.6 fails 10368 * [417]12399 boehm-gc fails (when building a cross compiler): libtool 10369 unable to infer tagged configuration 10370 * [418]13068 mklibgcc.in doesn't handle multi-level multilib 10371 subdirectories properly 10372 10373 Internal compiler errors (multi-platform) 10374 10375 * [419]10060 ICE (stack overflow) on huge file (300k lines) due to 10376 recursive behaviour of copy_rtx_if_shared, in emit_rtl.c 10377 * [420]10555 (c++) ICE on undefined template argument 10378 * [421]10706 (c++) ICE in mangle_class_name_for_template 10379 * [422]11496 (fortran) error in flow_loops_find when -funroll-loops 10380 active 10381 * [423]11741 ICE in pre_insert_copy_insn, in gcse.c 10382 * [424]12440 GCC crashes during compilation of quicktime4linux 2.0.0 10383 * [425]12632 (fortran) -fbounds-check ICE 10384 * [426]12712 (c++) ICE on short legit C++ code fragment with gcc 10385 3.3.2 10386 * [427]12726 (c++) ICE (segfault) on trivial code 10387 * [428]12890 (c++) ICE on compilation of class with throwing method 10388 * [429]12900 (c++) ICE in rtl_verify_flow_info_1 10389 * [430]13060 (fortran) ICE in fixup_var_refs_1, in function.c on 10390 correct code with -O2 -fno-force-mem 10391 * [431]13289 (c++) ICE in regenerate_decl_from_template on recursive 10392 template 10393 * [432]13318 ICE: floating point exception in the loop optimizer 10394 * [433]13392 (c++) ICE in convert_from_eh_region_ranges_1, in 10395 except.c 10396 * [434]13574 (c++) invalid array default initializer in class lets 10397 gcc consume all memory and die 10398 * [435]13475 ICE on SIMD variables with partial value initialization 10399 * [436]13797 (c++) ICE on invalid template parameter 10400 * [437]13824 (java) gcj SEGV with simple .java program 10401 10402 C and optimization bugs 10403 10404 * [438]8776 loop invariants are not removed (most likely) 10405 * [439]10339 [sparc,ppc,ppc64] Invalid optimization: replacing 10406 strncmp by memcmp 10407 * [440]11350 undefined labels with -Os -fPIC 10408 * [441]12826 Optimizer removes reference through volatile pointer 10409 * [442]12500 stabs debug info: void no longer a predefined / builtin 10410 type 10411 * [443]12941 builtin-bitops-1.c miscompilation (latent bug) 10412 * [444]12953 tree inliner bug (in inline_forbidden_p) and fix 10413 * [445]13041 linux-2.6/sound/core/oss/rate.c miscompiled 10414 * [446]13507 spurious printf format warning 10415 * [447]13382 Type information for const pointer disappears during 10416 optimization. 10417 * [448]13394 noreturn attribute ignored on recursive invokation 10418 * [449]13400 Compiled code crashes storing to read-only location 10419 * [450]13521 Endless loop in calculate_global_regs_live 10420 10421 C++ compiler and library 10422 10423 Some of the bug fixes in this list were made to implement decisions 10424 that the ISO C++ standards committee has made concerning several defect 10425 reports (DRs). Links in the list below point to detailed discussion of 10426 the relevant defect report. 10427 * [451]2094 unimplemented: use of `ptrmem_cst' in template type 10428 unification 10429 * [452]2294 using declaration confusion 10430 * [453]5050 template instantiation depth exceeds limit: recursion 10431 problem? 10432 * [454]9371 Bad exception handling in 10433 i/ostream::operator>>/<<(streambuf*) 10434 * [455]9546 bad exception handling in ostream members 10435 * [456]10081 basic_ios::_M_cache_locale leaves NULL members in the 10436 face of unknown locales 10437 * [457]10093 [458][DR 61] Setting failbit in exceptions doesn't work 10438 * [459]10095 istream::operator>>(int&) sets ios::badbit when 10439 ios::failbit is set. 10440 * [460]11554 Warning about reordering of initializers doesn't mention 10441 location of constructor 10442 * [461]12297 istream::sentry::sentry() handles eof() incorrectly. 10443 * [462]12352 Exception safety problems in src/localename.cc 10444 * [463]12438 Memory leak in locale::combine() 10445 * [464]12540 Memory leak in locale::locale(const char*) 10446 * [465]12594 DRs [466]60 [TC] and [467]63 [TC] not implemented 10447 * [468]12657 Resolution of [469]DR 292 (WP) still unimplemented 10448 * [470]12696 memory eating infinite loop in diagnostics (error 10449 recovery problem) 10450 * [471]12815 Code compiled with optimization behaves unexpectedly 10451 * [472]12862 Conflicts between typedefs/enums and namespace member 10452 declarations 10453 * [473]12926 Wrong value after assignment in initialize list using 10454 bit-fields 10455 * [474]12967 Resolution of [475]DR 300 [WP] still unimplemented 10456 * [476]12971 Resolution of [477]DR 328 [WP] still unimplemented 10457 * [478]13007 basic_streambuf::pubimbue, imbue wrong 10458 * [479]13009 Implicitly-defined assignment operator writes to wrong 10459 memory 10460 * [480]13057 regparm attribute not applied to destructor 10461 * [481]13070 -Wformat option ignored in g++ 10462 * [482]13081 forward template declarations in <complex> let inlining 10463 fail 10464 * [483]13239 Assertion does not seem to work correctly anymore 10465 * [484]13262 "xxx is private within this context" when initializing a 10466 self-contained template class 10467 * [485]13290 simple typo in concept checking for std::generate_n 10468 * [486]13323 Template code does not compile in presence of typedef 10469 * [487]13369 __verify_grouping (and __add_grouping?) not correct 10470 * [488]13371 infinite loop with packed struct and inlining 10471 * [489]13445 Template argument replacement "dereferences" a typedef 10472 * [490]13461 Fails to access protected-ctor from public constant 10473 * [491]13462 Non-standard-conforming type set::pointer 10474 * [492]13478 gcc uses wrong constructor to initialize a const 10475 reference 10476 * [493]13544 "conflicting types" for enums in different scopes 10477 * [494]13650 string::compare should not (always) use 10478 traits_type::length() 10479 * [495]13683 bogus warning about passing non-PODs through ellipsis 10480 * [496]13688 Derived class is denied access to protected base class 10481 member class 10482 * [497]13774 Member variable cleared in virtual multiple inheritance 10483 class 10484 * [498]13884 Protect sstream.tcc from extern template use 10485 10486 Java compiler and library 10487 10488 * [499]10746 [win32] garbage collection crash in GCJ 10489 10490 Objective-C compiler and library 10491 10492 * [500]11433 Crash due to dereferencing null pointer when querying 10493 protocol 10494 10495 Fortran compiler and library 10496 10497 * [501]12633 logical expression gives incorrect result with 10498 -fugly-logint option 10499 * [502]13037 [gcse-lm] g77 generates incorrect code 10500 * [503]13213 Hex constant problem when compiling with -fugly-logint 10501 and -ftypeless-boz 10502 10503 x86-specific (Intel/AMD) 10504 10505 * [504]4490 ICE with -m128bit-long-double 10506 * [505]12292 [x86_64] ICE: RTL check: expected code `const_int', have 10507 `reg' in make_field_assignment, in combine.c 10508 * [506]12441 ICE: can't find a register to spill 10509 * [507]12943 array static-init failure under -fpic, -fPIC 10510 * [508]13608 Incorrect code with -O3 -ffast-math 10511 10512 PowerPC-specific 10513 10514 * [509]11598 testcase gcc.dg/20020118-1.c fails runtime check of 10515 __attribute__((aligned(16))) 10516 * [510]11793 ICE in extract_insn, in recog.c (const_vector's) 10517 * [511]12467 vmsumubm emitted when vmsummbm appropriate (typo in 10518 altivec.md) 10519 * [512]12537 g++ generates writeable text sections 10520 10521 SPARC-specific 10522 10523 * [513]12496 wrong result for __atomic_add(&value, -1) when using -O0 10524 -m64 10525 * [514]12865 mprotect call to make trampoline executable may fail 10526 * [515]13354 ICE in sparc_emit_set_const32 10527 10528 ARM-specific 10529 10530 * [516]10467 [arm] ICE in pre_insert_copy_insn, 10531 10532 ia64-specific 10533 10534 * [517]11226 ICE passing struct arg with two floats 10535 * [518]11227 ICE for _Complex float, _Complex long double args 10536 * [519]12644 GCC 3.3.2 fails to compile glibc on ia64 10537 * [520]13149 build gcc-3.3.2 1305 error:unrecognizable insn 10538 * Various fixes for libunwind 10539 10540 Alpha-specific 10541 10542 * [521]12654 Incorrect comparison code generated for Alpha 10543 * [522]12965 SEGV+ICE in cc1plus on alpha-linux with -O2 10544 * [523]13031 ICE (unrecognizable insn) when building gnome-libs-1.4.2 10545 10546 HPPA-specific 10547 10548 * [524]11634 [hppa] ICE in verify_local_live_at_start, in flow.c 10549 * [525]12158 [hppa] compilation does not terminate at -O1 10550 10551 S390-specific 10552 10553 * [526]11992 Wrong built-in code for memcmp with length 1<<24: only 10554 (1<<24)-1 possible for CLCL-Instruction 10555 10556 SH-specific 10557 10558 * [527]9365 segfault in gen_far_branch (config/sh/sh.c) 10559 * [528]10392 optimizer generates faulty array indexing 10560 * [529]11322 SH profiler outputs multiple definitions of symbol 10561 * [530]13069 gcc/config/sh/rtems.h broken 10562 * [531]13302 Putting a va_list in a struct causes seg fault 10563 * [532]13585 Incorrect optimization of call to sfunc 10564 * Fix inappropriately exported libgcc functions from the shared 10565 library 10566 10567 Other embedded target specific 10568 10569 * [533]8916 [mcore] unsigned char assign gets hosed. 10570 * [534]11576 [h8300] ICE in change_address_1, in emit-rtl.c 10571 * [535]13122 [h8300] local variable gets corrupted by function call 10572 when -fomit-frame-pointer is given 10573 * [536]13256 [cris] strict_low_part mistreated in delay slots 10574 * [537]13373 [mcore] optimization with -frerun-cse-after-loop 10575 -fexpensive-optimizations produces wrong code on mcore 10576 10577 GNU HURD-specific 10578 10579 * [538]12561 gcc/config/t-gnu needs updating to work with 10580 --with-sysroot 10581 10582 Tru64 Unix specific 10583 10584 * [539]6243 testsuite fails almost all tests due to no libintl in 10585 LD_LIBRARY_PATH during test. 10586 * [540]11397 weak aliases broken on Tru64 UNIX 10587 10588 AIX-specific 10589 10590 * [541]12505 build failure due to defines of uchar in cpphash.h and 10591 sys/types.h 10592 * [542]13150 WEAK symbols not exported by collect2 10593 10594 IRIX-specific 10595 10596 * [543]12666 fixincludes problem on IRIX 6.5.19m 10597 10598 Solaris-specific 10599 10600 * [544]12969 Including sys/byteorder.h breaks configure checks 10601 10602 Testsuite problems (compiler is not affected) 10603 10604 * [545]10819 testsuite creates CR+LF on compiler version lines in 10605 test summary files 10606 * [546]11612 abi_check not finding correct libgcc_s.so.1 10607 10608 Miscellaneous 10609 10610 * [547]13211 using -###, incorrect warnings about unused linker file 10611 are produced 10612 __________________________________________________________________ 10613 10614 GCC 3.3.4 10615 10616 This is the [548]list of problem reports (PRs) from GCC's bug tracking 10617 system that are known to be fixed in the 3.3.4 release. This list might 10618 not be complete (that is, it is possible that some PRs that have been 10619 fixed are not listed here). 10620 __________________________________________________________________ 10621 10622 GCC 3.3.5 10623 10624 This is the [549]list of problem reports (PRs) from GCC's bug tracking 10625 system that are known to be fixed in the 3.3.5 release. This list might 10626 not be complete (that is, it is possible that some PRs that have been 10627 fixed are not listed here). 10628 __________________________________________________________________ 10629 10630 GCC 3.3.6 10631 10632 This is the [550]list of problem reports (PRs) from GCC's bug tracking 10633 system that are known to be fixed in the 3.3.6 release. This list might 10634 not be complete (that is, it is possible that some PRs that have been 10635 fixed are not listed here). 10636 10637 10638 For questions related to the use of GCC, please consult these web 10639 pages and the [551]GCC manuals. If that fails, the 10640 [552]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 10641 web pages and the development of GCC are welcome on our developer 10642 list at [553]gcc (a] gcc.gnu.org. All of [554]our lists have public 10643 archives. 10644 10645 Copyright (C) [555]Free Software Foundation, Inc. Verbatim copying and 10646 distribution of this entire article is permitted in any medium, 10647 provided this notice is preserved. 10648 10649 These pages are [556]maintained by the GCC team. Last modified 10650 2014-06-28[557]. 10651 10652 References 10653 10654 1. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.6 10655 2. http://gcc.gnu.org/gcc-3.1/changes.html#obsolete_systems 10656 3. http://gcc.gnu.org/gcc-3.3/changes.html#obsolete_systems 10657 4. http://gcc.gnu.org/gcc-3.3/changes.html#nonnull_attribute 10658 5. http://gcc.gnu.org/news/dfa.html 10659 6. http://gcc.gnu.org/c99status.html 10660 7. https://gcc.gnu.org/onlinedocs/gcc-3.3.6/g77/News.html 10661 8. https://gcc.gnu.org/PR10140 10662 9. https://gcc.gnu.org/PR10198 10663 10. https://gcc.gnu.org/PR10338 10664 11. https://gcc.gnu.org/PR3581 10665 12. https://gcc.gnu.org/PR4382 10666 13. https://gcc.gnu.org/PR5533 10667 14. https://gcc.gnu.org/PR6387 10668 15. https://gcc.gnu.org/PR6412 10669 16. https://gcc.gnu.org/PR6620 10670 17. https://gcc.gnu.org/PR6663 10671 18. https://gcc.gnu.org/PR7068 10672 19. https://gcc.gnu.org/PR7083 10673 20. https://gcc.gnu.org/PR7647 10674 21. https://gcc.gnu.org/PR7675 10675 22. 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232. https://gcc.gnu.org/PR11282 10886 233. https://gcc.gnu.org/PR11301 10887 234. https://gcc.gnu.org/PR11308 10888 235. https://gcc.gnu.org/PR11473 10889 236. https://gcc.gnu.org/PR11503 10890 237. https://gcc.gnu.org/PR11513 10891 238. https://gcc.gnu.org/PR11198 10892 239. https://gcc.gnu.org/PR11304 10893 240. https://gcc.gnu.org/PR11381 10894 241. https://gcc.gnu.org/PR11536 10895 242. https://gcc.gnu.org/PR11557 10896 243. https://gcc.gnu.org/PR5897 10897 244. https://gcc.gnu.org/PR11279 10898 245. https://gcc.gnu.org/PR11022 10899 246. https://gcc.gnu.org/PR2330 10900 247. https://gcc.gnu.org/PR5388 10901 248. https://gcc.gnu.org/PR5390 10902 249. https://gcc.gnu.org/PR7877 10903 250. https://gcc.gnu.org/PR9393 10904 251. https://gcc.gnu.org/PR10032 10905 252. https://gcc.gnu.org/PR10468 10906 253. https://gcc.gnu.org/PR10527 10907 254. https://gcc.gnu.org/PR10679 10908 255. https://gcc.gnu.org/PR10682 10909 256. https://gcc.gnu.org/PR10689 10910 257. 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https://gcc.gnu.org/PR13475 11089 436. https://gcc.gnu.org/PR13797 11090 437. https://gcc.gnu.org/PR13824 11091 438. https://gcc.gnu.org/PR8776 11092 439. https://gcc.gnu.org/PR10339 11093 440. https://gcc.gnu.org/PR11350 11094 441. https://gcc.gnu.org/PR12826 11095 442. https://gcc.gnu.org/PR12500 11096 443. https://gcc.gnu.org/PR12941 11097 444. https://gcc.gnu.org/PR12953 11098 445. https://gcc.gnu.org/PR13041 11099 446. https://gcc.gnu.org/PR13507 11100 447. https://gcc.gnu.org/PR13382 11101 448. https://gcc.gnu.org/PR13394 11102 449. https://gcc.gnu.org/PR13400 11103 450. https://gcc.gnu.org/PR13521 11104 451. https://gcc.gnu.org/PR2094 11105 452. https://gcc.gnu.org/PR2294 11106 453. https://gcc.gnu.org/PR5050 11107 454. https://gcc.gnu.org/PR9371 11108 455. https://gcc.gnu.org/PR9546 11109 456. https://gcc.gnu.org/PR10081 11110 457. https://gcc.gnu.org/PR10093 11111 458. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#61 11112 459. https://gcc.gnu.org/PR10095 11113 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481. https://gcc.gnu.org/PR13070 11135 482. https://gcc.gnu.org/PR13081 11136 483. https://gcc.gnu.org/PR13239 11137 484. https://gcc.gnu.org/PR13262 11138 485. https://gcc.gnu.org/PR13290 11139 486. https://gcc.gnu.org/PR13323 11140 487. https://gcc.gnu.org/PR13369 11141 488. https://gcc.gnu.org/PR13371 11142 489. https://gcc.gnu.org/PR13445 11143 490. https://gcc.gnu.org/PR13461 11144 491. https://gcc.gnu.org/PR13462 11145 492. https://gcc.gnu.org/PR13478 11146 493. https://gcc.gnu.org/PR13544 11147 494. https://gcc.gnu.org/PR13650 11148 495. https://gcc.gnu.org/PR13683 11149 496. https://gcc.gnu.org/PR13688 11150 497. https://gcc.gnu.org/PR13774 11151 498. https://gcc.gnu.org/PR13884 11152 499. https://gcc.gnu.org/PR10746 11153 500. https://gcc.gnu.org/PR11433 11154 501. https://gcc.gnu.org/PR12633 11155 502. https://gcc.gnu.org/PR13037 11156 503. https://gcc.gnu.org/PR13213 11157 504. https://gcc.gnu.org/PR4490 11158 505. https://gcc.gnu.org/PR12292 11159 506. https://gcc.gnu.org/PR12441 11160 507. https://gcc.gnu.org/PR12943 11161 508. https://gcc.gnu.org/PR13608 11162 509. https://gcc.gnu.org/PR11598 11163 510. https://gcc.gnu.org/PR11793 11164 511. https://gcc.gnu.org/PR12467 11165 512. https://gcc.gnu.org/PR12537 11166 513. https://gcc.gnu.org/PR12496 11167 514. https://gcc.gnu.org/PR12865 11168 515. https://gcc.gnu.org/PR13354 11169 516. https://gcc.gnu.org/PR10467 11170 517. https://gcc.gnu.org/PR11226 11171 518. https://gcc.gnu.org/PR11227 11172 519. https://gcc.gnu.org/PR12644 11173 520. https://gcc.gnu.org/PR13149 11174 521. https://gcc.gnu.org/PR12654 11175 522. https://gcc.gnu.org/PR12965 11176 523. https://gcc.gnu.org/PR13031 11177 524. https://gcc.gnu.org/PR11634 11178 525. https://gcc.gnu.org/PR12158 11179 526. https://gcc.gnu.org/PR11992 11180 527. https://gcc.gnu.org/PR9365 11181 528. https://gcc.gnu.org/PR10392 11182 529. https://gcc.gnu.org/PR11322 11183 530. https://gcc.gnu.org/PR13069 11184 531. https://gcc.gnu.org/PR13302 11185 532. https://gcc.gnu.org/PR13585 11186 533. https://gcc.gnu.org/PR8916 11187 534. https://gcc.gnu.org/PR11576 11188 535. https://gcc.gnu.org/PR13122 11189 536. https://gcc.gnu.org/PR13256 11190 537. https://gcc.gnu.org/PR13373 11191 538. https://gcc.gnu.org/PR12561 11192 539. https://gcc.gnu.org/PR6243 11193 540. https://gcc.gnu.org/PR11397 11194 541. https://gcc.gnu.org/PR12505 11195 542. https://gcc.gnu.org/PR13150 11196 543. https://gcc.gnu.org/PR12666 11197 544. https://gcc.gnu.org/PR12969 11198 545. https://gcc.gnu.org/PR10819 11199 546. https://gcc.gnu.org/PR11612 11200 547. https://gcc.gnu.org/PR13211 11201 548. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=3.3.4 11202 549. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=3.3.5 11203 550. https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=3.3.6 11204 551. https://gcc.gnu.org/onlinedocs/ 11205 552. mailto:gcc-help (a] gcc.gnu.org 11206 553. mailto:gcc (a] gcc.gnu.org 11207 554. https://gcc.gnu.org/lists.html 11208 555. http://www.fsf.org/ 11209 556. https://gcc.gnu.org/about.html 11210 557. http://validator.w3.org/check/referer 11211 ====================================================================== 11212 http://gcc.gnu.org/gcc-3.2/index.html 11213 11214 GCC 3.2 Release Series 11215 11216 April 25, 2003 11217 11218 The [1]GNU project and the GCC developers are pleased to announce the 11219 release of GCC 3.2.3. 11220 11221 The purpose of the GCC 3.2 release series is to provide a stable 11222 platform for OS distributors to use building their next releases. A 11223 primary objective was to stabilize the C++ ABI; we believe that the 11224 interface to the compiler and the C++ standard library are now 11225 relatively stable. 11226 11227 Be aware that C++ code compiled by GCC 3.2.x will (in general) not 11228 interoperate with code compiled by GCC 3.1.1 or earlier. 11229 11230 Please refer to our [2]detailed list of news, caveats, and bug-fixes 11231 for further information. 11232 11233 Release History 11234 11235 GCC 3.2.3 11236 April 25, 2003 ([3]changes) 11237 11238 GCC 3.2.2 11239 February 5, 2003 ([4]changes) 11240 11241 GCC 3.2.1 11242 November 19, 2002 ([5]changes) 11243 11244 GCC 3.2 11245 August 14, 2002 ([6]changes) 11246 11247 References and Acknowledgements 11248 11249 GCC used to stand for the GNU C Compiler, but since the compiler 11250 supports several other languages aside from C, it now stands for the 11251 GNU Compiler Collection. 11252 11253 A list of [7]successful builds is updated as new information becomes 11254 available. 11255 11256 The GCC developers would like to thank the numerous people that have 11257 contributed new features, improvements, bug fixes, and other changes as 11258 well as test results to GCC. This [8]amazing group of volunteers is 11259 what makes GCC successful. 11260 11261 For additional information about GCC please refer to the [9]GCC project 11262 web site or contact the [10]GCC development mailing list. 11263 11264 To obtain GCC please use [11]our mirror sites, or our CVS server. 11265 11266 11267 For questions related to the use of GCC, please consult these web 11268 pages and the [12]GCC manuals. If that fails, the 11269 [13]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 11270 web pages and the development of GCC are welcome on our developer 11271 list at [14]gcc (a] gcc.gnu.org. All of [15]our lists have public 11272 archives. 11273 11274 Copyright (C) [16]Free Software Foundation, Inc. Verbatim copying and 11275 distribution of this entire article is permitted in any medium, 11276 provided this notice is preserved. 11277 11278 These pages are [17]maintained by the GCC team. Last modified 11279 2014-06-28[18]. 11280 11281 References 11282 11283 1. http://www.gnu.org/ 11284 2. http://gcc.gnu.org/gcc-3.2/changes.html 11285 3. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.3 11286 4. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.2 11287 5. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.1 11288 6. http://gcc.gnu.org/gcc-3.2/changes.html#3.2 11289 7. http://gcc.gnu.org/gcc-3.2/buildstat.html 11290 8. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 11291 9. http://gcc.gnu.org/index.html 11292 10. mailto:gcc (a] gcc.gnu.org 11293 11. http://gcc.gnu.org/mirrors.html 11294 12. https://gcc.gnu.org/onlinedocs/ 11295 13. mailto:gcc-help (a] gcc.gnu.org 11296 14. mailto:gcc (a] gcc.gnu.org 11297 15. https://gcc.gnu.org/lists.html 11298 16. http://www.fsf.org/ 11299 17. https://gcc.gnu.org/about.html 11300 18. http://validator.w3.org/check/referer 11301 ====================================================================== 11302 http://gcc.gnu.org/gcc-3.2/changes.html 11303 11304 GCC 3.2 Release Series 11305 Changes, New Features, and Fixes 11306 11307 The latest release in the 3.2 release series is [1]GCC 3.2.3. 11308 11309 Caveats and New Features 11310 11311 Caveats 11312 11313 * The C++ compiler does not correctly zero-initialize 11314 pointers-to-data members. You must explicitly initialize them. For 11315 example: int S::*m(0); will work, but depending on 11316 default-initialization to zero will not work. This bug cannot be 11317 fixed in GCC 3.2 without inducing unacceptable risks. It will be 11318 fixed in GCC 3.3. 11319 * This GCC release is based on the GCC 3.1 sourcebase, and thus has 11320 all the [2]changes in the GCC 3.1 series. In addition, GCC 3.2 has 11321 a number of C++ ABI fixes which make its C++ compiler generate 11322 binary code which is incompatible with the C++ compilers found in 11323 earlier GCC releases, including GCC 3.1 and GCC 3.1.1. 11324 11325 Frontend Enhancements 11326 11327 C/C++/Objective-C 11328 11329 * The method of constructing the list of directories to be searched 11330 for header files has been revised. If a directory named by a -I 11331 option is a standard system include directory, the option is 11332 ignored to ensure that the default search order for system 11333 directories and the special treatment of system header files are 11334 not defeated. 11335 * The C and Objective-C compilers no longer accept the "Naming Types" 11336 extension (typedef foo = bar); it was already unavailable in C++. 11337 Code which uses it will need to be changed to use the "typeof" 11338 extension instead: typedef typeof(bar) foo. (We have removed this 11339 extension without a period of deprecation because it has caused the 11340 compiler to crash since version 3.0 and no one noticed until very 11341 recently. Thus we conclude it is not in widespread use.) 11342 11343 C++ 11344 11345 * GCC 3.2 fixed serveral differences between the C++ ABI implemented 11346 in GCC and the multi-vendor standard, but more have been found 11347 since the release. 3.2.1 adds a new warning, -Wabi, to warn about 11348 code which is affected by these bugs. We will fix these bugs in 11349 some future release, once we are confident that all have been 11350 found; until then, it is our intention to make changes to the ABI 11351 only if they are necessary for correct compilation of C++, as 11352 opposed to conformance to the ABI documents. 11353 * For details on how to build an ABI compliant compiler for GNU/Linux 11354 systems, check the [3]common C++ ABI page. 11355 11356 New Targets and Target Specific Improvements 11357 11358 IA-32 11359 11360 * Fixed a number of bugs in SSE and MMX intrinsics. 11361 * Fixed common compiler crashes with SSE instruction set enabled 11362 (implied by -march=pentium3, pentium4, athlon-xp) 11363 * __m128 and __m128i is not 128bit aligned when used in structures. 11364 11365 x86-64 11366 11367 * A bug whereby the compiler could generate bad code for bzero has 11368 been fixed. 11369 * ABI fixes (implying ABI incompatibilities with previous version in 11370 some corner cases) 11371 * Fixed prefetch code generation 11372 __________________________________________________________________ 11373 11374 GCC 3.2.3 11375 11376 3.2.3 is a bug fix release only; there are no new features that were 11377 not present in GCC 3.2.2. 11378 11379 Bug Fixes 11380 11381 This section lists the problem reports (PRs) from GCC's bug tracking 11382 system that are known to be fixed in the 3.2.3 release. This list might 11383 not be complete (that is, it is possible that some PRs that have been 11384 fixed are not listed here), and some of the titles have been changed to 11385 make them more clear. 11386 11387 Internal Compiler Errors (multi-platform) 11388 11389 * [4]3782: (c++) -quiet -fstats produces a segmentation fault in 11390 cc1plus 11391 * [5]6440: (c++) template specializations cause ICE 11392 * [6]7050: (c++) ICE on: (i ? get_string() : throw) 11393 * [7]7741: ICE on conflicting types (make_decl_rtl in varasm.c) 11394 * [8]7982: (c++) ICE due to infinite recursion (using STL set) 11395 * [9]8068: exceedingly high (infinite) memory usage 11396 * [10]8178: ICE with __builtin_ffs 11397 * [11]8396: ICE in copy_to_mode_reg, in explow.c 11398 * [12]8674: (c++) ICE in cp_expr_size, in cp/cp-lang.c 11399 * [13]9768: ICE when optimizing inline code at -O2 11400 * [14]9798: (c++) Infinite recursion (segfault) in 11401 cp/decl.c:push_using_directive with recursive using directives 11402 * [15]9799: mismatching structure initializer with nested flexible 11403 array member: ICE 11404 * [16]9928: ICE on duplicate enum declaration 11405 * [17]10114: ICE in mem_loc_descriptor, in dwarf2out.c (affects 11406 sparc, alpha) 11407 * [18]10352: ICE in find_reloads_toplev 11408 * [19]10336: ICE with -Wunreachable-code 11409 11410 C/optimizer bugs: 11411 11412 * [20]8224: Incorrect joining of signed and unsigned division 11413 * [21]8613: -O2 produces wrong code with builtin strlen and 11414 postincrements 11415 * [22]8828: gcc reports some code is unreachable when it is not 11416 * [23]9226: GCSE breaking argument passing 11417 * [24]9853: miscompilation of non-constant structure initializer 11418 * [25]9797: C99-style struct initializers are miscompiled 11419 * [26]9967: Some standard C function calls should not be replaced 11420 when optimizing for size 11421 * [27]10116: ce2: invalid merge of join_bb in the context of switch 11422 statements 11423 * [28]10171: wrong code for inlined function 11424 * [29]10175: -Wunreachable-code doesn't work for single lines 11425 11426 C++ compiler and library: 11427 11428 * [30]8316: Confusing diagnostic for code that misuses conversion 11429 operators 11430 * [31]9169: filebuf output fails if codecvt<>::out returns noconv 11431 * [32]9420: incomplete type incorrectly reported 11432 * [33]9459: typeof in return type specification of template not 11433 supported 11434 * [34]9507: filebuf::open handles ios_base::ate incorrectly 11435 * [35]9538: Out-of-bounds memory access in streambuf::sputbackc 11436 * [36]9602: Total confusion about template/friend/virtual/abstract 11437 * [37]9993: destructor not called for local object created within and 11438 returned from infinite loop 11439 * [38]10167: ieee_1003.1-2001 locale specialisations on a glibc-2.3.2 11440 system 11441 11442 Java compiler and library: 11443 11444 * [39]9652: libgcj build fails on irix6.5.1[78] 11445 * [40]10144: gas on solaris complains about bad .stabs lines for 11446 java, native as unaffected 11447 11448 x86-specific (Intel/AMD): 11449 11450 * [41]8746: gcc miscompiles Linux kernel ppa driver on x86 11451 * [42]9888: -mcpu=k6 -Os produces out of range loop instructions 11452 * [43]9638: Cross-build for target i386-elf and i586-pc-linux-gnu 11453 failed 11454 * [44]9954: Cross-build for target i586-pc-linux-gnu (--with-newlib) 11455 failed 11456 11457 SPARC-specific: 11458 11459 * [45]7784: [Sparc] ICE in extract_insn, in recog.c 11460 * [46]7796: sparc extra failure with -m64 on execute/930921-1.c in 11461 unroll.c 11462 * [47]8281: ICE when compiling with -O2 -fPIC for Ultrasparc 11463 * [48]8366: [Sparc] C testsuite failure with -m64 -fpic -O in 11464 execute/loop-2d.c 11465 * [49]8726: gcc -O2 miscompiles Samba 2.2.7 on 32-bit sparc 11466 * [50]9414: Scheduling bug on Ultrasparc 11467 * [51]10067: GCC-3.2.2 outputs invalid asm on sparc64 11468 11469 m68k-specific: 11470 11471 * [52]7248: broken "inclusive or" code 11472 * [53]8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1 11473 11474 PowerPC-specific: 11475 11476 * [54]9732: Wrong code with -O2 -fPIC 11477 * [55]10073: ICE: powerpc cannot split insn 11478 11479 Alpha-specific: 11480 11481 * [56]7702: optimization problem on a DEC alpha under OSF1 11482 * [57]9671: gcc.3.2.2 does not build on a HP Tru64 Unix v5.1B system 11483 11484 HP-specific: 11485 11486 * [58]8694: <string> breaks <ctype.h> on HP-UX 10.20 (DUP: 9275) 11487 * [59]9953: (ada) gcc 3.2.x can't build 3.3-branch ada on HP-UX 10 11488 (missing symbol) 11489 * [60]10271: Floating point args don't get reloaded across function 11490 calls with -O2 11491 11492 MIPS specific: 11493 11494 * [61]6362: mips-irix6 gcc-3.1 C testsuite failure with -mips4 in 11495 compile/920501-4.c 11496 11497 CRIS specific: 11498 11499 * [62]10377: gcc-3.2.2 creates bad assembler code for cris 11500 11501 Miscellaneous and minor bugs: 11502 11503 * [63]6955: collect2 says "core dumped" when there is no core 11504 __________________________________________________________________ 11505 11506 GCC 3.2.2 11507 11508 Beginning with 3.2.2, GCC's Makefile suite supports redirection of make 11509 install by means of the DESTDIR variable. Parts of the GCC tree have 11510 featured that support long before, but now it is available even from 11511 the top level. 11512 11513 Other than that, GCC 3.2.2 is a bug fix release only; there are no new 11514 features that were not present in GCC 3.2.1. 11515 11516 Bug Fixes 11517 11518 On the following i386-based systems GCC 3.2.1 broke the C ABI wrt. 11519 functions returning structures: Cygwin, FreeBSD (GCC 3.2.1 as shipped 11520 with FreeBSD 5.0 does not have this problem), Interix, a.out-based 11521 GNU/Linux and NetBSD, OpenBSD, and Darwin. GCC 3.2.2 reverts this ABI 11522 change, and thus restores ABI-compatibility with previous releases 11523 (except GCC 3.2.1) on these platforms. 11524 11525 This section lists the problem reports (PRs) from GCC's bug tracking 11526 system that are known to be fixed in the 3.2.2 release. This list might 11527 not be complete (that is, it is possible that some PRs that have been 11528 fixed are not listed here) and some of the titles have been changed to 11529 make them more clear. 11530 11531 Internal Compiler Errors (multi-platform) 11532 11533 * [64]5919: (c++) ICE when passing variable array to template 11534 function 11535 * [65]7129: (c++) ICE with min/max assignment operators (<?= and >?=) 11536 * [66]7507: ICE with -O2 when address of called function is a 11537 complicated expression 11538 * [67]7622: ICE with nested inline functions if function's address is 11539 taken 11540 * [68]7681: (fortran) ICE in compensate_edge, in reg-stack.c (also PR 11541 [69]9258) 11542 * [70]8031: (c++) ICE in code comparing typeids and casting from 11543 virtual base 11544 * [71]8275: ICE in simplify_subreg 11545 * [72]8332: (c++) builtin strlen/template interaction causes ICE 11546 * [73]8372: (c++) ICE on explicit call of destructor 11547 * [74]8439: (c, not c++) empty struct causes ICE 11548 * [75]8442: (c++) ICE with nested template classes 11549 * [76]8518: ICE when compiling mplayer ("extern inline" issue) 11550 * [77]8615: (c++) ICE with out-of-range character constant template 11551 argument 11552 * [78]8663: (c++) ICE in cp_expr_size, at cp-lang.c:307 11553 * [79]8799: (c++) ICE: error reporting routines re-entered 11554 * [80]9328: (c++) ICE with typeof(X) for overloaded X 11555 * [81]9465: (preprocessor) cpp -traditional ICE on null bytes 11556 11557 C++ (compiler and library) bugs 11558 11559 * [82]47: scoping in nested classes is broken 11560 * [83]6745: problems with iostream rdbuf() member function 11561 * [84]8214: conversion from const char* const to char* sometimes 11562 accepted illegally 11563 * [85]8493: builtin strlen and overload resolution (same bug as 11564 [86]8332) 11565 * [87]8503: strange behaviour of function types 11566 * [88]8727: compiler confused by inheritance from an anonymous struct 11567 * [89]7445: poor performance of std::locale::classic() in 11568 multi-threaded applications 11569 * [90]8230: mishandling of overflow in vector<T>::resize 11570 * [91]8399: sync_with_stdio(false) breaks unformatted input 11571 * [92]8662: illegal access of private member of unnamed class is 11572 accepted 11573 * [93]8707: "make distclean" fails in libstdc++-v3 directory 11574 * [94]8708: __USE_MALLOC doesn't work 11575 * [95]8790: Use of non-thread-safe strtok in src/localename.cc 11576 * [96]8887: Bug in date formats with --enable-clocale=generic 11577 * [97]9076: Call Frame Instructions are not handled correctly during 11578 unwind operation 11579 * [98]9151: std::setprecision limited to 16 digits when outputting a 11580 double to a stream 11581 * [99]9168: codecvt<char, char, mbstate_t> overwrites output buffers 11582 * [100]9269: libstdc++ headers: explicit specialization of function 11583 must precede its first use 11584 * [101]9322: return value of basic_streambuf<>::getloc affected by 11585 locale::global 11586 * [102]9433: segfault in runtime support for dynamic_cast 11587 11588 C and optimizer bugs 11589 11590 * [103]8032: GCC incorrectly initializes static structs that have 11591 flexible arrays 11592 * [104]8639: simple arithmetic expression broken 11593 * [105]8794: optimization improperly eliminates certain expressions 11594 * [106]8832: traditional "asm volatile" code is illegally optimized 11595 * [107]8988: loop optimizer bug: with -O2, code is generated that 11596 segfaults (found on i386, bug present for all platforms) 11597 * [108]9492: structure copy clobbers subsequent stores to structure 11598 11599 Objective-C bugs 11600 11601 * [109]9267: Objective-C parser won't build with newer bison versions 11602 (e.g. 1.875) 11603 11604 Ada bugs 11605 11606 * [110]8344: Ada build problem due to conflict between gcc/final.o, 11607 gcc/ada/final.o 11608 11609 Preprocessor bugs 11610 11611 * [111]8524: _Pragma within macros is improperly expanded 11612 * [112]8880: __WCHAR_TYPE__ macro incorrectly set to "long int" with 11613 -fshort-wchar 11614 11615 ARM-specific 11616 11617 * [113]9090: arm ICE with >= -O2; regression from gcc-2.95 11618 11619 x86-specific (Intel/AMD) 11620 11621 * [114]8588: ICE in extract_insn, at recog.c:NNNN (shift instruction) 11622 * [115]8599: loop unroll bug with -march=k6-3 11623 * [116]9506: ABI breakage in structure return (affects BSD and 11624 Cygwin, but not GNU/Linux) 11625 11626 FreeBSD 5.0 specific 11627 11628 * [117]9484: GCC 3.2.1 Bootstrap failure on FreeBSD 5.0 11629 11630 RTEMS-specific 11631 11632 * [118]9292: hppa1.1-rtems configurery problems 11633 * [119]9293: [m68k-elf/rtems] config/m68k/t-crtstuff bug 11634 * [120]9295: [mips-rtems] config/mips/rtems.h init/fini issue 11635 * [121]9296: gthr-rtems regression 11636 * [122]9316: powerpc-rtems: extending multilibs 11637 11638 HP-PA specific 11639 11640 * [123]9493: ICE with -O2 when building a simple function 11641 11642 Documentation 11643 11644 * [124]7341: hyperlink to gcov in GCC documentation doesn't work 11645 * [125]8947: Please add a warning about "-malign-double" in docs 11646 * [126]7448, [127]8882: typo cleanups 11647 __________________________________________________________________ 11648 11649 GCC 3.2.1 11650 11651 3.2.1 adds a new warning, -Wabi. This option warns when GNU C++ 11652 generates code that is known not to be binary-compatible with the 11653 vendor-neutral ia32/ia64 ABI. Please consult the GCC manual, included 11654 in the distribution, for details. 11655 11656 This release also removes an old GCC extension, "naming types", and the 11657 documentation now directs users to use a different GCC extension, 11658 __typeof__, instead. The feature had evidently been broken for a while. 11659 11660 Otherwise, 3.2.1 is a bug fix release only; other than bug fixes and 11661 the new warning there are no new features that were not present in GCC 11662 3.2. 11663 11664 In addition, the previous fix for [128]PR 7445 (poor performance of 11665 std::locale::classic() in multi-threaded applications) was reverted 11666 ("unfixed"), because the "fix" was not thread-safe. 11667 11668 Bug Fixes 11669 11670 This section lists the problem reports (PRs) from GCC's bug tracking 11671 system that are known to be fixed in the 3.2.1 release. This list might 11672 not be complete (that is, it is possible that some PRs that have been 11673 fixed are not listed here). As you can see, the number of bug fixes is 11674 quite large, so it is strongly recommended that users of earlier GCC 11675 3.x releases upgrade to GCC 3.2.1. 11676 11677 Internal Compiler Errors (multi-platform) 11678 11679 * [129]2521: (c++) ICE in build_ptrmemfunc, in cp/typeck.c 11680 * [130]5661: (c++) ICE instantiating template on array of unknown 11681 size (bad code) 11682 * [131]6419: (c++) ICE in make_decl_rtl for "longest" attribute on 11683 64-bit platforms 11684 * [132]6994: (c++) ICE in find_function_data 11685 * [133]7150: preprocessor: GCC -dM -E gives an ICE 11686 * [134]7160: ICE when optimizing branches without a return value 11687 * [135]7228: (c++) ICE when using member template and template 11688 function 11689 * [136]7266: (c++) ICE with -pedantic on missing typename 11690 * [137]7353: ICE from use of "Naming Types" extension, see above 11691 * [138]7411: ICE in instantiate_virtual_regs_1, in function.c 11692 * [139]7478: (c++) ICE on static_cast inside template 11693 * [140]7526: preprocessor core dump when _Pragma implies #pragma 11694 dependency 11695 * [141]7721: (c++) ICE on simple (but incorrect) template ([142]7803 11696 is a duplicate) 11697 * [143]7754: (c++) ICE on union with template parameter 11698 * [144]7788: (c++) redeclaring a definition as an incomplete class 11699 causes ICE 11700 * [145]8031: (c++) ICE in comptypes, in cp/typeck.c 11701 * [146]8055: preprocessor dies with SIG11 when building FreeBSD 11702 kernel 11703 * [147]8067: (c++) ICE due to mishandling of __FUNCTION__ and related 11704 variables 11705 * [148]8134: (c++) ICE in force_store_init_value on legal code 11706 * [149]8149: (c++) ICE on incomplete type 11707 * [150]8160: (c++) ICE in build_modify_expr, in cp/typeck.c: array 11708 initialization 11709 11710 C++ (compiler and library) bugs 11711 11712 * [151]5607: No pointer adjustment in covariant return types 11713 * [152]6579: Infinite loop with statement expressions in member 11714 initialization 11715 * [153]6803: Default copy constructor bug in GCC 3.1 11716 * [154]7176: g++ confused by friend and static member with same name 11717 * [155]7188: Segfault with template class and recursive (incorrect) 11718 initializer list 11719 * [156]7306: Regression: GCC 3.x fails to compile code with virtual 11720 inheritance if a method has a variable number of arguments 11721 * [157]7461: ctype<char>::classic_table() returns offset array on 11722 Cygwin 11723 * [158]7524: f(const float arg[3]) fails 11724 * [159]7584: Erroneous ambiguous base error on using declaration 11725 * [160]7676: Member template overloading problem 11726 * [161]7679: infinite loop when a right parenthesis is missing 11727 * [162]7811: default locale not taken from environment 11728 * [163]7961: compare( char *) implemented incorrectly in 11729 basic_string<> 11730 * [164]8071: basic_ostream::operator<<(streambuf*) loops forever if 11731 streambuf::underflow() leaves gptr() NULL (dups: [165]8127, 11732 [166]6745) 11733 * [167]8096: deque::at() throws std::range_error instead of 11734 std::out_of_range 11735 * [168]8127: cout << cin.rdbuf() infinite loop 11736 * [169]8218: Excessively large memory consumed for classes with large 11737 array members 11738 * [170]8287: GCC 3.2: Destructor called for non-constructed local 11739 object 11740 * [171]8347: empty vector range used in string construction causes 11741 core dump 11742 * [172]8348: fail() flag is set in istringstream when eof() flag is 11743 set 11744 * [173]8391: regression: infinite loop in cp/decl2.c(finish_file) 11745 11746 C and optimizer bugs 11747 11748 * [174]6627: -fno-align-functions doesn't seem to disable function 11749 alignment 11750 * [175]6631: life_analysis misoptimizes code to initialize fields of 11751 a structure 11752 * [176]7102: unsigned char division results in floating exception 11753 * [177]7120: Run once loop should *always* be unrolled 11754 (pessimization) 11755 * [178]7209: Bug involving array referencing and ?: operator 11756 * [179]7515: invalid inlining of global function with -O3 11757 * [180]7814: incorrect scheduling for glibc-2.2.92 strcpy test 11758 * [181]8467: bug in sibling call optimization 11759 11760 Preprocessor bugs 11761 11762 * [182]4890: incorrect line markers from the traditional preprocessor 11763 * [183]7357: -M option omits system headers files (making it the same 11764 as -MM) 11765 * [184]7358: Changes to Sun's make Dependencies 11766 * [185]7602: C++ header files found in CPLUS_INCLUDE_PATH treated as 11767 C headers 11768 * [186]7862: Interrupting GCC -MD removes .d file but not .o 11769 * [187]8190: Failed compilation deletes -MD dependency file 11770 * [188]8524: _Pragma within macro is improperly expanded 11771 11772 x86 specific (Intel/AMD) 11773 11774 * [189]5351: (i686-only) function pass-by-value structure copy 11775 corrupts stack ([190]7591 is a duplicate) 11776 * [191]6845, [192]7034, [193]7124, [194]7174: ICE's with 11777 -march=pentium3/pentium2/athlon (these are all the same underlying 11778 bug, in MMX register use) 11779 * [195]7134, [196]7375, [197]7390: ICE with -march=athlon (maybe same 11780 as above?) 11781 * [198]6890: xmmintrin.h, _MM_TRANSPOSE4_PS is broken 11782 * [199]6981: wrong code in 64-bit manipulation on x86 11783 * [200]7242: GCC -mcpu=pentium[23] doesn't define __tune_pentiumpro__ 11784 macro 11785 * [201]7396: ix86: cmpgt_ss, cmpge_ss, cmpngt_ss, and cmpnge_ss SSE 11786 intrinsics are broken 11787 * [202]7630: GCC 3.2 breaks on Mozilla 1.0's JS sources with 11788 -march=pentium4 11789 * [203]7693: Typo in i386 mmintrin.h header 11790 * [204]7723: ICE - Pentium3 sse - GCC 3.2 11791 * [205]7951: ICE on -march=pentium4 -O2 -mfpmath=sse 11792 * [206]8146: (i686 only) gcc 3.2 miscompiles gcc 2.95.3 11793 11794 PowerPC specific 11795 11796 * [207]5967: GCC bug when profiling nested functions on powerpc 11797 * [208]6984: wrong code generated with -O2, -O3, -Os for do-while 11798 loop on PowerPC 11799 * [209]7114: PowerPC: ICE building strcoll.op from glibc-2.2.5 11800 * [210]7130: miscompiled code for GCC-3.1 on 11801 powerpc-unknown-linux-gnu with -funroll-all-loops 11802 * [211]7133: PowerPC ICE: unrecognizable insn 11803 * [212]7380: ICE in extract_insn, at recog.c:2148 11804 * [213]8252: ICE on Altivec code with optimization turned on 11805 * [214]8451: Altivec ICE in GCC 3.2 11806 11807 HP/PA specific 11808 11809 * [215]7250: __ashrdi3 returns wrong value on 32 bit hppa 11810 11811 SPARC specific 11812 11813 * [216]6668: when using --disable-multilib, libgcc_s.so is installed 11814 in the wrong place on sparc-solaris 11815 * [217]7151: ICE when compiling for UltraSPARC 11816 * [218]7335: SPARC: ICE in verify_wide_reg (flow.c:557) with long 11817 double and -O1 11818 * [219]7842: [REGRESSION] SPARC code gen bug 11819 11820 ARM specific 11821 11822 * [220]7856: [arm] invalid offset in constant pool reference 11823 * [221]7967: optimization produces wrong code (ARM) 11824 11825 Alpha specific 11826 11827 * [222]7374: __builtin_fabsl broken on alpha 11828 11829 IBM s390 specific 11830 11831 * [223]7370: ICE in fixup_var_refs_1 on s390x 11832 * [224]7409: loop optimization bug on s390x-linux-gnu 11833 * [225]8232: s390x: ICE when using bcmp with int length argument 11834 11835 SCO specific 11836 11837 * [226]7623: SCO OpenServer build fails with machmode.def: undefined 11838 symbol: BITS_PER_UNIT 11839 11840 m68k/Coldfire specific 11841 11842 * [227]8314: crtbegin, crtend need to be multilib'ed for this 11843 platform 11844 11845 Documentation 11846 11847 * [228]761: Document some undocumented options 11848 * [229]5610: Fix documentation about invoking SSE instructions 11849 (-mfpmath=sse) 11850 * [230]7484: List -Wmissing-declarations as C-only option 11851 * [231]7531: -mcmodel not documented for x86-64 11852 * [232]8120: Update documentation of bad use of ## 11853 __________________________________________________________________ 11854 11855 GCC 3.2 11856 11857 3.2 is a small bug fix release, but there is a change to the 11858 application binary interface (ABI), hence the change to the second part 11859 of the version number. 11860 11861 The main purpose of the 3.2 release is to correct a couple of problems 11862 in the C++ ABI, with the intention of providing a stable interface 11863 going forward. Accordingly, 3.2 is only a small change to 3.1.1. 11864 11865 Bug Fixes 11866 11867 C++ 11868 11869 * [233]7320: g++ 3.2 relocation problem 11870 * [234]7470: vtable: virtual function pointers not in declaration 11871 order 11872 11873 libstdc++ 11874 11875 * [235]6410: Trouble with non-ASCII monetary symbols and wchar_t 11876 * [236]6503, [237]6642, [238]7186: Problems with comparing or 11877 subtracting various types of const and non-const iterators 11878 * [239]7216: ambiguity with basic_iostream::traits_type 11879 * [240]7220: problem with basic_istream::ignore(0,delimiter) 11880 * [241]7222: locale::operator==() doesn't work on std::locale("") 11881 * [242]7286: placement operator delete issue 11882 * [243]7442: cxxabi.h does not match the C++ ABI 11883 * [244]7445: poor performance of std::locale::classic() in 11884 multi-threaded applications 11885 11886 x86-64 specific 11887 11888 * [245]7291: off-by-one in generated inline bzero code for x86-64 11889 11890 11891 For questions related to the use of GCC, please consult these web 11892 pages and the [246]GCC manuals. If that fails, the 11893 [247]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 11894 web pages and the development of GCC are welcome on our developer 11895 list at [248]gcc (a] gcc.gnu.org. All of [249]our lists have public 11896 archives. 11897 11898 Copyright (C) [250]Free Software Foundation, Inc. Verbatim copying and 11899 distribution of this entire article is permitted in any medium, 11900 provided this notice is preserved. 11901 11902 These pages are [251]maintained by the GCC team. Last modified 11903 2014-06-27[252]. 11904 11905 References 11906 11907 1. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.3 11908 2. http://gcc.gnu.org/gcc-3.1/changes.html 11909 3. http://gcc.gnu.org/gcc-3.2/c++-abi.html 11910 4. https://gcc.gnu.org/PR3782 11911 5. https://gcc.gnu.org/PR6440 11912 6. https://gcc.gnu.org/PR7050 11913 7. https://gcc.gnu.org/PR7741 11914 8. https://gcc.gnu.org/PR7982 11915 9. https://gcc.gnu.org/PR8068 11916 10. https://gcc.gnu.org/PR8178 11917 11. https://gcc.gnu.org/PR8396 11918 12. https://gcc.gnu.org/PR8674 11919 13. https://gcc.gnu.org/PR9768 11920 14. https://gcc.gnu.org/PR9798 11921 15. https://gcc.gnu.org/PR9799 11922 16. https://gcc.gnu.org/PR9928 11923 17. https://gcc.gnu.org/PR10114 11924 18. https://gcc.gnu.org/PR10352 11925 19. https://gcc.gnu.org/PR10336 11926 20. https://gcc.gnu.org/PR8224 11927 21. https://gcc.gnu.org/PR8613 11928 22. https://gcc.gnu.org/PR8828 11929 23. https://gcc.gnu.org/PR9226 11930 24. https://gcc.gnu.org/PR9853 11931 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11958 52. https://gcc.gnu.org/PR7248 11959 53. https://gcc.gnu.org/PR8343 11960 54. https://gcc.gnu.org/PR9732 11961 55. https://gcc.gnu.org/PR10073 11962 56. https://gcc.gnu.org/PR7702 11963 57. https://gcc.gnu.org/PR9671 11964 58. https://gcc.gnu.org/PR8694 11965 59. https://gcc.gnu.org/PR9953 11966 60. https://gcc.gnu.org/PR10271 11967 61. https://gcc.gnu.org/PR6362 11968 62. https://gcc.gnu.org/PR10377 11969 63. https://gcc.gnu.org/PR6955 11970 64. https://gcc.gnu.org/PR5919 11971 65. https://gcc.gnu.org/PR7129 11972 66. https://gcc.gnu.org/PR7507 11973 67. https://gcc.gnu.org/PR7622 11974 68. https://gcc.gnu.org/PR7681 11975 69. https://gcc.gnu.org/PR9528 11976 70. https://gcc.gnu.org/PR8031 11977 71. https://gcc.gnu.org/PR8275 11978 72. https://gcc.gnu.org/PR8332 11979 73. https://gcc.gnu.org/PR8372 11980 74. https://gcc.gnu.org/PR8439 11981 75. https://gcc.gnu.org/PR8442 11982 76. https://gcc.gnu.org/PR8518 11983 77. https://gcc.gnu.org/PR8615 11984 78. 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105. https://gcc.gnu.org/PR8794 12012 106. https://gcc.gnu.org/PR8832 12013 107. https://gcc.gnu.org/PR8988 12014 108. https://gcc.gnu.org/PR9492 12015 109. https://gcc.gnu.org/PR9267 12016 110. https://gcc.gnu.org/PR8344 12017 111. https://gcc.gnu.org/PR8524 12018 112. https://gcc.gnu.org/PR8880 12019 113. https://gcc.gnu.org/PR9090 12020 114. https://gcc.gnu.org/PR8588 12021 115. https://gcc.gnu.org/PR8599 12022 116. https://gcc.gnu.org/PR9506 12023 117. https://gcc.gnu.org/PR9484 12024 118. https://gcc.gnu.org/PR9292 12025 119. https://gcc.gnu.org/PR9293 12026 120. https://gcc.gnu.org/PR9295 12027 121. https://gcc.gnu.org/PR9296 12028 122. https://gcc.gnu.org/PR9316 12029 123. https://gcc.gnu.org/PR9493 12030 124. https://gcc.gnu.org/PR7341 12031 125. https://gcc.gnu.org/PR8947 12032 126. https://gcc.gnu.org/PR7448 12033 127. https://gcc.gnu.org/PR8882 12034 128. https://gcc.gnu.org/PR7445 12035 129. https://gcc.gnu.org/PR2521 12036 130. https://gcc.gnu.org/PR5661 12037 131. https://gcc.gnu.org/PR6419 12038 132. https://gcc.gnu.org/PR6994 12039 133. https://gcc.gnu.org/PR7150 12040 134. https://gcc.gnu.org/PR7160 12041 135. https://gcc.gnu.org/PR7228 12042 136. https://gcc.gnu.org/PR7266 12043 137. https://gcc.gnu.org/PR7353 12044 138. https://gcc.gnu.org/PR7411 12045 139. https://gcc.gnu.org/PR7478 12046 140. https://gcc.gnu.org/PR7526 12047 141. https://gcc.gnu.org/PR7721 12048 142. https://gcc.gnu.org/PR7803 12049 143. https://gcc.gnu.org/PR7754 12050 144. https://gcc.gnu.org/PR7788 12051 145. https://gcc.gnu.org/PR8031 12052 146. https://gcc.gnu.org/PR8055 12053 147. https://gcc.gnu.org/PR8067 12054 148. https://gcc.gnu.org/PR8134 12055 149. https://gcc.gnu.org/PR8149 12056 150. https://gcc.gnu.org/PR8160 12057 151. https://gcc.gnu.org/PR5607 12058 152. https://gcc.gnu.org/PR6579 12059 153. https://gcc.gnu.org/PR6803 12060 154. https://gcc.gnu.org/PR7176 12061 155. https://gcc.gnu.org/PR7188 12062 156. https://gcc.gnu.org/PR7306 12063 157. https://gcc.gnu.org/PR7461 12064 158. https://gcc.gnu.org/PR7524 12065 159. https://gcc.gnu.org/PR7584 12066 160. https://gcc.gnu.org/PR7676 12067 161. https://gcc.gnu.org/PR7679 12068 162. https://gcc.gnu.org/PR7811 12069 163. https://gcc.gnu.org/PR7961 12070 164. https://gcc.gnu.org/PR8071 12071 165. https://gcc.gnu.org/PR8127 12072 166. https://gcc.gnu.org/PR6745 12073 167. https://gcc.gnu.org/PR8096 12074 168. https://gcc.gnu.org/PR8127 12075 169. https://gcc.gnu.org/PR8218 12076 170. https://gcc.gnu.org/PR8287 12077 171. https://gcc.gnu.org/PR8347 12078 172. https://gcc.gnu.org/PR8348 12079 173. https://gcc.gnu.org/PR8391 12080 174. https://gcc.gnu.org/PR6627 12081 175. https://gcc.gnu.org/PR6631 12082 176. https://gcc.gnu.org/PR7102 12083 177. https://gcc.gnu.org/PR7120 12084 178. https://gcc.gnu.org/PR7209 12085 179. https://gcc.gnu.org/PR7515 12086 180. https://gcc.gnu.org/PR7814 12087 181. https://gcc.gnu.org/PR8467 12088 182. https://gcc.gnu.org/PR4890 12089 183. https://gcc.gnu.org/PR7357 12090 184. https://gcc.gnu.org/PR7358 12091 185. https://gcc.gnu.org/PR7602 12092 186. https://gcc.gnu.org/PR7862 12093 187. https://gcc.gnu.org/PR8190 12094 188. https://gcc.gnu.org/PR8524 12095 189. https://gcc.gnu.org/PR5351 12096 190. https://gcc.gnu.org/PR7591 12097 191. https://gcc.gnu.org/PR6845 12098 192. https://gcc.gnu.org/PR7034 12099 193. https://gcc.gnu.org/PR7124 12100 194. https://gcc.gnu.org/PR7174 12101 195. https://gcc.gnu.org/PR7134 12102 196. https://gcc.gnu.org/PR7375 12103 197. https://gcc.gnu.org/PR7390 12104 198. https://gcc.gnu.org/PR6890 12105 199. https://gcc.gnu.org/PR6981 12106 200. https://gcc.gnu.org/PR7242 12107 201. https://gcc.gnu.org/PR7396 12108 202. https://gcc.gnu.org/PR7630 12109 203. https://gcc.gnu.org/PR7693 12110 204. https://gcc.gnu.org/PR7723 12111 205. https://gcc.gnu.org/PR7951 12112 206. https://gcc.gnu.org/PR8146 12113 207. https://gcc.gnu.org/PR5967 12114 208. https://gcc.gnu.org/PR6984 12115 209. https://gcc.gnu.org/PR7114 12116 210. https://gcc.gnu.org/PR7130 12117 211. https://gcc.gnu.org/PR7133 12118 212. https://gcc.gnu.org/PR7380 12119 213. https://gcc.gnu.org/PR8252 12120 214. https://gcc.gnu.org/PR8451 12121 215. https://gcc.gnu.org/PR7250 12122 216. https://gcc.gnu.org/PR6668 12123 217. https://gcc.gnu.org/PR7151 12124 218. https://gcc.gnu.org/PR7335 12125 219. https://gcc.gnu.org/PR7842 12126 220. https://gcc.gnu.org/PR7856 12127 221. https://gcc.gnu.org/PR7967 12128 222. https://gcc.gnu.org/PR7374 12129 223. https://gcc.gnu.org/PR7370 12130 224. https://gcc.gnu.org/PR7409 12131 225. https://gcc.gnu.org/PR8232 12132 226. https://gcc.gnu.org/PR7623 12133 227. https://gcc.gnu.org/PR8314 12134 228. https://gcc.gnu.org/PR761 12135 229. https://gcc.gnu.org/PR5610 12136 230. https://gcc.gnu.org/PR7484 12137 231. https://gcc.gnu.org/PR7531 12138 232. https://gcc.gnu.org/PR8120 12139 233. https://gcc.gnu.org/PR7320 12140 234. https://gcc.gnu.org/PR7470 12141 235. https://gcc.gnu.org/PR6410 12142 236. https://gcc.gnu.org/PR6503 12143 237. https://gcc.gnu.org/PR6642 12144 238. https://gcc.gnu.org/PR7186 12145 239. https://gcc.gnu.org/PR7216 12146 240. https://gcc.gnu.org/PR7220 12147 241. https://gcc.gnu.org/PR7222 12148 242. https://gcc.gnu.org/PR7286 12149 243. https://gcc.gnu.org/PR7442 12150 244. https://gcc.gnu.org/PR7445 12151 245. https://gcc.gnu.org/PR7291 12152 246. https://gcc.gnu.org/onlinedocs/ 12153 247. mailto:gcc-help (a] gcc.gnu.org 12154 248. mailto:gcc (a] gcc.gnu.org 12155 249. https://gcc.gnu.org/lists.html 12156 250. http://www.fsf.org/ 12157 251. https://gcc.gnu.org/about.html 12158 252. http://validator.w3.org/check/referer 12159 ====================================================================== 12160 http://gcc.gnu.org/gcc-3.1/index.html 12161 12162 GCC 3.1 12163 12164 July 27, 2002 12165 12166 The [1]GNU project and the GCC developers are pleased to announce the 12167 release of GCC 3.1.1. 12168 12169 The links below still apply to GCC 3.1.1. 12170 12171 May 15, 2002 12172 12173 The [2]GNU project and the GCC developers are pleased to announce the 12174 release of GCC 3.1. 12175 12176 GCC used to stand for the GNU C Compiler, but since the compiler 12177 supports several other languages aside from C, it now stands for the 12178 GNU Compiler Collection. 12179 12180 A list of [3]successful builds is updated as new information becomes 12181 available. 12182 12183 The GCC developers would like to thank the numerous people that have 12184 contributed [4]new features, improvements, bug fixes, and other changes 12185 as well as test results to GCC. This [5]amazing group of volunteers is 12186 what makes GCC successful. 12187 12188 For additional information about GCC please refer to the [6]GCC project 12189 web site or contact the [7]GCC development mailing list. 12190 12191 To obtain GCC please use [8]our mirror sites, or our CVS server. 12192 __________________________________________________________________ 12193 12194 12195 For questions related to the use of GCC, please consult these web 12196 pages and the [9]GCC manuals. If that fails, the 12197 [10]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12198 web pages and the development of GCC are welcome on our developer 12199 list at [11]gcc (a] gcc.gnu.org. All of [12]our lists have public 12200 archives. 12201 12202 Copyright (C) [13]Free Software Foundation, Inc. Verbatim copying and 12203 distribution of this entire article is permitted in any medium, 12204 provided this notice is preserved. 12205 12206 These pages are [14]maintained by the GCC team. Last modified 12207 2014-06-28[15]. 12208 12209 References 12210 12211 1. http://www.gnu.org/ 12212 2. http://www.gnu.org/ 12213 3. http://gcc.gnu.org/gcc-3.1/buildstat.html 12214 4. http://gcc.gnu.org/gcc-3.1/changes.html 12215 5. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12216 6. http://gcc.gnu.org/index.html 12217 7. mailto:gcc (a] gcc.gnu.org 12218 8. http://gcc.gnu.org/mirrors.html 12219 9. https://gcc.gnu.org/onlinedocs/ 12220 10. mailto:gcc-help (a] gcc.gnu.org 12221 11. mailto:gcc (a] gcc.gnu.org 12222 12. https://gcc.gnu.org/lists.html 12223 13. http://www.fsf.org/ 12224 14. https://gcc.gnu.org/about.html 12225 15. http://validator.w3.org/check/referer 12226 ====================================================================== 12227 http://gcc.gnu.org/gcc-3.1/changes.html 12228 12229 GCC 3.1 Release Series 12230 Changes, New Features, and Fixes 12231 12232 Additional changes in GCC 3.1.1 12233 12234 * A bug related to how structures and unions are returned has been 12235 fixed for powerpc-*-netbsd*. 12236 * An important bug in the implementation of -fprefetch-loop-arrays 12237 has been fixed. Previously the optimization prefetched random 12238 blocks of memory for most targets except for i386. 12239 * The Java compiler now compiles Java programs much faster and also 12240 works with parallel make. 12241 * Nested functions have been fixed for mips*-*-netbsd*. 12242 * Some missing floating point support routines have beed added for 12243 mips*-*-netbsd*. 12244 * This [1]message gives additional information about the bugs fixed 12245 in this release. 12246 12247 Caveats 12248 12249 * The -traditional C compiler option has been deprecated and will be 12250 removed in GCC 3.3. (It remains possible to preprocess non-C code 12251 with the traditional preprocessor.) 12252 * The default debugging format for most ELF platforms (including 12253 GNU/Linux and FreeBSD; notable exception is Solaris) has changed 12254 from stabs to DWARF2. This requires GDB 5.1.1 or later. 12255 12256 General Optimizer Improvements 12257 12258 * Jan Hubicka, SuSE Labs, together with Richard Henderson, Red Hat, 12259 and Andreas Jaeger, SuSE Labs, has contributed [2]infrastructure 12260 for profile driven optimizations. 12261 Options -fprofile-arcs and -fbranch-probabilities can now be used 12262 to improve speed of the generated code by profiling the actual 12263 program behaviour on typical runs. In the absence of profile info 12264 the compiler attempts to guess the profile statically. 12265 * [3]SPEC2000 and SPEC95 benchmark suites are now used daily to 12266 monitor performance of the generated code. 12267 According to the SPECInt2000 results on an AMD Athlon CPU, the code 12268 generated by GCC 3.1 is 6% faster on the average (8.2% faster with 12269 profile feedback) compared to GCC 3.0. The code produced by GCC 3.0 12270 is about 2.1% faster compared to 2.95.3. Tests were done using the 12271 -O2 -march=athlon command-line options. 12272 * Alexandre Oliva, of Red Hat, has generalized the tree inlining 12273 infrastructure developed by CodeSourcery, LLC for the C++ front 12274 end, so that it is now used in the C front end too. Inlining 12275 functions as trees exposes them earlier to the compiler, giving it 12276 more opportunities for optimization. 12277 * Support for data prefetching instructions has been added to the GCC 12278 back end and several targets. A new __builtin_prefetch intrinsic is 12279 available to explicitly insert prefetch instructions and 12280 experimental support for loop array prefetching has been added (see 12281 -fprefetch-loop-array documentation). 12282 * Support for emitting debugging information for macros has been 12283 added for DWARF2. It is activated using -g3. 12284 12285 New Languages and Language specific improvements 12286 12287 C/C++ 12288 12289 * A few more [4]ISO C99 features. 12290 * The preprocessor is 10-50% faster than the preprocessor in GCC 3.0. 12291 * The preprocessor's symbol table has been merged with the symbol 12292 table of the C, C++ and Objective-C front ends. 12293 * The preprocessor consumes less memory than the preprocessor in GCC 12294 3.0, often significantly so. On normal input files, it typically 12295 consumes less memory than pre-3.0 cccp-based GCC, too. 12296 12297 C++ 12298 12299 * -fhonor-std and -fno-honor-std have been removed. -fno-honor-std 12300 was a workaround to allow std compliant code to work with the 12301 non-std compliant libstdc++-v2. libstdc++-v3 is std compliant. 12302 * The C++ ABI has been fixed so that void (A::*)() const is mangled 12303 as "M1AKFvvE", rather than "MK1AFvvE" as before. This change only 12304 affects pointer to cv-qualified member function types. 12305 * The C++ ABI has been changed to correctly handle this code: 12306 struct A { 12307 void operator delete[] (void *, size_t); 12308 }; 12309 12310 struct B : public A { 12311 }; 12312 12313 new B[10]; 12314 12315 The amount of storage allocated for the array will be greater than 12316 it was in 3.0, in order to store the number of elements in the 12317 array, so that the correct size can be passed to operator delete[] 12318 when the array is deleted. Previously, the value passed to operator 12319 delete[] was unpredictable. 12320 This change will only affect code that declares a two-argument 12321 operator delete[] with a second parameter of type size_t in a base 12322 class, and does not override that definition in a derived class. 12323 * The C++ ABI has been changed so that: 12324 struct A { 12325 void operator delete[] (void *, size_t); 12326 void operator delete[] (void *); 12327 }; 12328 12329 does not cause unnecessary storage to be allocated when an array of 12330 A objects is allocated. 12331 This change will only affect code that declares both of these forms 12332 of operator delete[], and declared the two-argument form before the 12333 one-argument form. 12334 * The C++ ABI has been changed so that when a parameter is passed by 12335 value, any cleanup for that parameter is performed in the caller, 12336 as specified by the ia64 C++ ABI, rather than the called function 12337 as before. As a result, classes with a non-trivial destructor but a 12338 trivial copy constructor will be passed and returned by invisible 12339 reference, rather than by bitwise copy as before. 12340 * G++ now supports the "named return value optimization": for code 12341 like 12342 A f () { 12343 A a; 12344 ... 12345 return a; 12346 } 12347 12348 G++ will allocate a in the return value slot, so that the return 12349 becomes a no-op. For this to work, all return statements in the 12350 function must return the same variable. 12351 * Improvements to the C++ library are listed in [5]the libstdc++-v3 12352 FAQ. 12353 12354 Objective-C 12355 12356 * Annoying linker warnings (due to incorrect code being generated) 12357 have been fixed. 12358 * If a class method cannot be found, the compiler no longer issues a 12359 warning if a corresponding instance method exists in the root 12360 class. 12361 * Forward @protocol declarations have been fixed. 12362 * Loading of categories has been fixed in certain situations (GNU run 12363 time only). 12364 * The class lookup in the run-time library has been rewritten so that 12365 class method dispatch is more than twice as fast as it used to be 12366 (GNU run time only). 12367 12368 Java 12369 12370 * libgcj now includes RMI, java.lang.ref.*, javax.naming, and 12371 javax.transaction. 12372 * Property files and other system resources can be compiled into 12373 executables which use libgcj using the new gcj --resource feature. 12374 * libgcj has been ported to more platforms. In particular there is 12375 now a mostly-functional mingw32 (Windows) target port. 12376 * JNI and CNI invocation interfaces were implemented, so gcj-compiled 12377 Java code can now be called from a C/C++ application. 12378 * gcj can now use builtin functions for certain known methods, for 12379 instance Math.cos. 12380 * gcj can now automatically remove redundant array-store checks in 12381 some common cases. 12382 * The --no-store-checks optimization option was added. This can be 12383 used to omit runtime store checks for code which is known not to 12384 throw ArrayStoreException 12385 * The following third party interface standards were added to libgcj: 12386 org.w3c.dom and org.xml.sax. 12387 * java.security has been merged with GNU Classpath. The new package 12388 is now JDK 1.2 compliant, and much more complete. 12389 * A bytecode verifier was added to the libgcj interpreter. 12390 * java.lang.Character was rewritten to comply with the Unicode 3.0 12391 standard, and improve performance. 12392 * Partial support for many more locales was added to libgcj. 12393 * Socket timeouts have been implemented. 12394 * libgcj has been merged into a single shared library. There are no 12395 longer separate shared libraries for the garbage collector and 12396 zlib. 12397 * Several performance improvements were made to gcj and libgcj: 12398 + Hash synchronization (thin locks) 12399 + A special allocation path for finalizer-free objects 12400 + Thread-local allocation 12401 + Parallel GC, and other GC tweaks 12402 12403 Fortran 12404 12405 Fortran improvements are listed in [6]the Fortran documentation. 12406 12407 Ada 12408 12409 [7]Ada Core Technologies, Inc, has contributed its GNAT Ada 95 front 12410 end and associated tools. The GNAT compiler fully implements the Ada 12411 language as defined by the ISO/IEC 8652 standard. 12412 12413 Please note that the integration of the Ada front end is still work in 12414 progress. 12415 12416 New Targets and Target Specific Improvements 12417 12418 * Hans-Peter Nilsson has contributed a port to [8]MMIX, the CPU 12419 architecture used in new editions of Donald E. Knuth's The Art of 12420 Computer Programming. 12421 * [9]Axis Communications has contributed its port to the CRIS CPU 12422 architecture, used in the ETRAX system-on-a-chip series. See 12423 [10]Axis' developer site for technical information. 12424 * Alexandre Oliva, of Red Hat, has contributed a port to the 12425 [11]SuperH SH5 64-bit RISC microprocessor architecture, extending 12426 the existing SH port. 12427 * UltraSPARC is fully supported in 64-bit mode. The option -m64 12428 enables it. 12429 * For compatibility with the Sun compiler #pragma redefine_extname 12430 has been implemented on Solaris. 12431 * The x86 back end has had some noticeable work done to it. 12432 + SuSE Labs developers Jan Hubicka, Bo Thorsen and Andreas 12433 Jaeger have contributed a port to the AMD x86-64 architecture. 12434 For more information on x86-64 see [12]http://www.x86-64.org. 12435 + The compiler now supports MMX, 3DNow!, SSE, and SSE2 12436 instructions. Options -mmmx, -m3dnow, -msse, and -msse2 will 12437 enable the respective instruction sets. Intel C++ compatible 12438 MMX/3DNow!/SSE intrinsics are implemented. SSE2 intrinsics 12439 will be added in next major release. 12440 + Following those improvements, targets for Pentium MMX, K6-2, 12441 K6-3, Pentium III, Pentium 4, and Athlon 4 Mobile/XP/MP were 12442 added. Refer to the documentation on -march= and -mcpu= 12443 options for details. 12444 + For those targets that support it, -mfpmath=sse will cause the 12445 compiler to generate SSE/SSE2 instructions for floating point 12446 math instead of x87 instructions. Usually, this will lead to 12447 quicker code -- especially on the Pentium 4. Note that only 12448 scalar floating point instructions are used and GCC does not 12449 exploit SIMD features yet. 12450 + Prefetch support has been added to the Pentium III, Pentium 4, 12451 K6-2, K6-3, and Athlon series. 12452 + Code generated for floating point to integer conversions has 12453 been improved leading to better performance of many 3D 12454 applications. 12455 * The PowerPC back end has added 64-bit PowerPC GNU/Linux support. 12456 * C++ support for AIX has been improved. 12457 * Aldy Hernandez, of Red Hat, Inc, has contributed extensions to the 12458 PowerPC port supporting the AltiVec programming model (SIMD). The 12459 support, though presently useful, is experimental and is expected 12460 to stabilize for 3.2. The support is written to conform to 12461 Motorola's AltiVec specs. See -maltivec. 12462 12463 Obsolete Systems 12464 12465 Support for a number of older systems has been declared obsolete in GCC 12466 3.1. Unless there is activity to revive them, the next release of GCC 12467 will have their sources permanently removed. 12468 12469 All configurations of the following processor architectures have been 12470 declared obsolete: 12471 * MIL-STD-1750A, 1750a-*-* 12472 * AMD A29k, a29k-*-* 12473 * Convex, c*-convex-* 12474 * Clipper, clipper-*-* 12475 * Elxsi, elxsi-*-* 12476 * Intel i860, i860-*-* 12477 * Sun picoJava, pj-*-* and pjl-*-* 12478 * Western Electric 32000, we32k-*-* 12479 12480 Most configurations of the following processor architectures have been 12481 declared obsolete, but we are preserving a few systems which may have 12482 active developers. It is unlikely that the remaining systems will 12483 survive much longer unless we see definite signs of port activity. 12484 * Motorola 88000 except 12485 + Generic a.out, m88k-*-aout* 12486 + Generic SVR4, m88k-*-sysv4 12487 + OpenBSD, m88k-*-openbsd* 12488 * NS32k except 12489 + NetBSD, ns32k-*-netbsd* 12490 + OpenBSD, ns32k-*-openbsd*. 12491 * ROMP except 12492 + OpenBSD, romp-*-openbsd*. 12493 12494 Finally, only some configurations of these processor architectures are 12495 being obsoleted. 12496 * Alpha: 12497 + OSF/1, alpha*-*-osf[123]*. (Digital Unix and Tru64 Unix, aka 12498 alpha*-*-osf[45], are still supported.) 12499 * ARM: 12500 + RISCiX, arm-*-riscix*. 12501 * i386: 12502 + 386BSD, i?86-*-bsd* 12503 + Chorus, i?86-*-chorusos* 12504 + DG/UX, i?86-*-dgux* 12505 + FreeBSD 1.x, i?86-*-freebsd1.* 12506 + IBM AIX, i?86-*-aix* 12507 + ISC UNIX, i?86-*-isc* 12508 + GNU/Linux with pre-BFD linker, i?86-*-linux*oldld* 12509 + NEXTstep, i?86-next-* 12510 + OSF UNIX, i?86-*-osf1* and i?86-*-osfrose* 12511 + RTEMS/coff, i?86-*-rtemscoff* 12512 + RTEMS/go32, i?86-go32-rtems* 12513 + Sequent/BSD, i?86-sequent-bsd* 12514 + Sequent/ptx before version 3, i?86-sequent-ptx[12]* and 12515 i?86-sequent-sysv3* 12516 + SunOS, i?86-*-sunos* 12517 * Motorola 68000: 12518 + Altos, m68[k0]*-altos-* 12519 + Apollo, m68[k0]*-apollo-* 12520 + Apple A/UX, m68[k0]*-apple-* 12521 + Bull, m68[k0]*-bull-* 12522 + Convergent, m68[k0]*-convergent-* 12523 + Generic SVR3, m68[k0]*-*-sysv3* 12524 + ISI, m68[k0]*-isi-* 12525 + LynxOS, m68[k0]*-*-lynxos* 12526 + NEXT, m68[k0]*-next-* 12527 + RTEMS/coff, m68[k0]*-*-rtemscoff* 12528 + Sony, m68[k0]*-sony-* 12529 * MIPS: 12530 + DEC Ultrix, mips-*-ultrix* and mips-dec-* 12531 + Generic BSD, mips-*-bsd* 12532 + Generic System V, mips-*-sysv* 12533 + IRIX before version 5, mips-sgi-irix[1234]* 12534 + RiscOS, mips-*-riscos* 12535 + Sony, mips-sony-* 12536 + Tandem, mips-tandem-* 12537 * SPARC: 12538 + RTEMS/a.out, sparc-*-rtemsaout*. 12539 12540 Documentation improvements 12541 12542 * The old manual ("Using and Porting the GNU Compiler Collection") 12543 has been replaced by a users manual ("Using the GNU Compiler 12544 Collection") and a separate internals reference manual ("GNU 12545 Compiler Collection Internals"). 12546 * More complete and much improved documentation about GCC's internal 12547 representation used by the C and C++ front ends. 12548 * Many cleanups and improvements in general. 12549 12550 12551 For questions related to the use of GCC, please consult these web 12552 pages and the [13]GCC manuals. If that fails, the 12553 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12554 web pages and the development of GCC are welcome on our developer 12555 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 12556 archives. 12557 12558 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 12559 distribution of this entire article is permitted in any medium, 12560 provided this notice is preserved. 12561 12562 These pages are [18]maintained by the GCC team. Last modified 12563 2014-06-28[19]. 12564 12565 References 12566 12567 1. https://gcc.gnu.org/ml/gcc/2002-07/msg01208.html 12568 2. http://gcc.gnu.org/news/profiledriven.html 12569 3. http://gcc.gnu.org/benchmarks/ 12570 4. http://gcc.gnu.org/c99status.html 12571 5. https://gcc.gnu.org/onlinedocs/libstdc++/faq.html 12572 6. https://gcc.gnu.org/onlinedocs/gcc-3.1.1/g77/News.html 12573 7. http://www.adacore.com/ 12574 8. http://www-cs-faculty.stanford.edu/~knuth/mmix.html 12575 9. http://www.axis.com/ 12576 10. http://developer.axis.com/ 12577 11. http://www.superh.com/ 12578 12. http://www.x86-64.org/ 12579 13. https://gcc.gnu.org/onlinedocs/ 12580 14. mailto:gcc-help (a] gcc.gnu.org 12581 15. mailto:gcc (a] gcc.gnu.org 12582 16. https://gcc.gnu.org/lists.html 12583 17. http://www.fsf.org/ 12584 18. https://gcc.gnu.org/about.html 12585 19. http://validator.w3.org/check/referer 12586 ====================================================================== 12587 http://gcc.gnu.org/gcc-3.0/index.html 12588 12589 GCC 3.0.4 12590 12591 February 20, 2002 12592 12593 The [1]GNU project and the GCC developers are pleased to announce the 12594 release of GCC 3.0.4, which is a bug-fix release for the GCC 3.0 12595 series. 12596 12597 GCC used to stand for the GNU C Compiler, but since the compiler 12598 supports several other languages aside from C, it now stands for the 12599 GNU Compiler Collection. 12600 12601 GCC 3.0.x has several new optimizations, new targets, new languages and 12602 many other new features, relative to GCC 2.95.x. See the [2]new 12603 features page for a more complete list. 12604 12605 A list of [3]successful builds is updated as new information becomes 12606 available. 12607 12608 The GCC developers would like to thank the numerous people that have 12609 contributed new features, test results, bug fixes, etc to GCC. This 12610 [4]amazing group of volunteers is what makes GCC successful. 12611 12612 And finally, we can't in good conscience fail to mention some 12613 [5]caveats to using GCC 3.0.x. 12614 12615 For additional information about GCC please refer to the [6]GCC project 12616 web site or contact the [7]GCC development mailing list. 12617 12618 To obtain GCC please use [8]our mirror sites, or our CVS server. 12619 __________________________________________________________________ 12620 12621 Previous 3.0.x Releases 12622 12623 December 20, 2001: GCC 3.0.3 has been released. 12624 October 25, 2001: GCC 3.0.2 has been released. 12625 August 20, 2001: GCC 3.0.1 has been released. 12626 June 18, 2001: GCC 3.0 has been released. 12627 12628 12629 For questions related to the use of GCC, please consult these web 12630 pages and the [9]GCC manuals. If that fails, the 12631 [10]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12632 web pages and the development of GCC are welcome on our developer 12633 list at [11]gcc (a] gcc.gnu.org. All of [12]our lists have public 12634 archives. 12635 12636 Copyright (C) [13]Free Software Foundation, Inc. Verbatim copying and 12637 distribution of this entire article is permitted in any medium, 12638 provided this notice is preserved. 12639 12640 These pages are [14]maintained by the GCC team. Last modified 12641 2014-06-28[15]. 12642 12643 References 12644 12645 1. http://www.gnu.org/ 12646 2. http://gcc.gnu.org/gcc-3.0/features.html 12647 3. http://gcc.gnu.org/gcc-3.0/buildstat.html 12648 4. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12649 5. http://gcc.gnu.org/gcc-3.0/caveats.html 12650 6. http://gcc.gnu.org/index.html 12651 7. mailto:gcc (a] gcc.gnu.org 12652 8. http://gcc.gnu.org/mirrors.html 12653 9. https://gcc.gnu.org/onlinedocs/ 12654 10. mailto:gcc-help (a] gcc.gnu.org 12655 11. mailto:gcc (a] gcc.gnu.org 12656 12. https://gcc.gnu.org/lists.html 12657 13. http://www.fsf.org/ 12658 14. https://gcc.gnu.org/about.html 12659 15. http://validator.w3.org/check/referer 12660 ====================================================================== 12661 http://gcc.gnu.org/gcc-3.0/features.html 12662 12663 GCC 3.0 New Features 12664 12665 Additional changes in GCC 3.0.4 12666 12667 * GCC 3.0 now supports newer versions of the [1]NetBSD operating 12668 system, which use the ELF object file format, on x86 processors. 12669 * Correct debugging information is generated from functions that have 12670 lines from multiple files (e.g. yacc output). 12671 * A fix for whitespace handling in the -traditional preprocessor, 12672 which can affect Fortran. 12673 * Fixes to the exception handling runtime. 12674 * More fixes for bad code generation in C++. 12675 * A fix for shared library generation under AIX 4.3. 12676 * Documentation updates. 12677 * Port of GCC to Tensilica's Xtensa processor contributed. 12678 * A fix for compiling the PPC Linux kernel (FAT fs wouldn't link). 12679 12680 Additional changes in GCC 3.0.3 12681 12682 * A fix to correct an accidental change to the PowerPC ABI. 12683 * Fixes for bad code generation on a variety of architectures. 12684 * Improvements to the debugging information generated for C++ 12685 classes. 12686 * Fixes for bad code generation in C++. 12687 * A fix to avoid crashes in the C++ demangler. 12688 * A fix to the C++ standard library to avoid buffer overflows. 12689 * Miscellaneous improvements for a variety of architectures. 12690 12691 Additional changes in GCC 3.0.2 12692 12693 * Fixes for bad code generation during loop unrolling. 12694 * Fixes for bad code generation by the sibling call optimization. 12695 * Minor improvements to x86 code generation. 12696 * Implementation of function descriptors in C++ vtables for IA64. 12697 * Numerous minor bug-fixes. 12698 12699 Additional changes in GCC 3.0.1 12700 12701 * C++ fixes for incorrect code-generation. 12702 * Improved cross-compiling support for the C++ standard library. 12703 * Fixes for some embedded targets that worked in GCC 2.95.3, but not 12704 in GCC 3.0. 12705 * Fixes for various exception-handling bugs. 12706 * A port to the S/390 architecture. 12707 12708 General Optimizer Improvements 12709 12710 * [2]Basic block reordering pass. 12711 * New if-conversion pass with support for conditional (predicated) 12712 execution. 12713 * New tail call and sibling call elimination optimizations. 12714 * New register renaming pass. 12715 * New (experimental) [3]static single assignment (SSA) representation 12716 support. 12717 * New dead-code elimination pass implemented using the SSA 12718 representation. 12719 * [4]Global null pointer test elimination. 12720 * [5]Global code hoisting/unification. 12721 * More builtins and optimizations for stdio.h, string.h and old BSD 12722 functions, as well as for ISO C99 functions. 12723 * New builtin __builtin_expect for giving hints to the branch 12724 predictor. 12725 12726 New Languages and Language specific improvements 12727 12728 * The GNU Compiler for the Java(TM) language (GCJ) is now integrated 12729 and supported, including the run-time library containing most 12730 common non-GUI Java classes, a bytecode interpreter, and the Boehm 12731 conservative garbage collector. Many bugs have been fixed. GCJ can 12732 compile Java source or Java bytecodes to either native code or Java 12733 class files, and supports native methods written in either the 12734 standard JNI or the more efficient and convenient CNI. 12735 * Here is a [6]partial list of C++ improvements, both new features 12736 and those no longer supported. 12737 * New C++ ABI. On the IA-64 platform GCC is capable of 12738 inter-operating with other IA-64 compilers. 12739 * The new ABI also significantly reduces the size of symbol and debug 12740 information. 12741 * New [7]C++ support library and many C++ bug fixes, vastly improving 12742 our conformance to the ISO C++ standard. 12743 * New [8]inliner for C++. 12744 * Rewritten C preprocessor, integrated into the C, C++ and Objective 12745 C compilers, with very many improvements including ISO C99 support 12746 and [9]improvements to dependency generation. 12747 * Support for more [10]ISO C99 features. 12748 * Many improvements to support for checking calls to format functions 12749 such as printf and scanf, including support for ISO C99 format 12750 features, extensions from the Single Unix Specification and GNU 12751 libc 2.2, checking of strfmon formats and features to assist in 12752 auditing for format string security bugs. 12753 * New warnings for C code that may have undefined semantics because 12754 of violations of sequence point rules in the C standard (such as a 12755 = a++;, a[n] = b[n++]; and a[i++] = i;), included in -Wall. 12756 * Additional warning option -Wfloat-equal. 12757 * Improvements to -Wtraditional. 12758 * Fortran improvements are listed in [11]the Fortran documentation. 12759 12760 New Targets and Target Specific Improvements 12761 12762 * New x86 back end, generating much improved code. 12763 * Support for a generic i386-elf target contributed. 12764 * New option to emit x86 assembly code using Intel style syntax 12765 (-mintel-syntax). 12766 * HPUX 11 support contributed. 12767 * Improved PowerPC code generation, including scheduled prologue and 12768 epilogue. 12769 * Port of GCC to Intel's IA-64 processor contributed. 12770 * Port of GCC to Motorola's MCore 210 and 340 contributed. 12771 * New unified back-end for Arm, Thumb and StrongArm contributed. 12772 * Port of GCC to Intel's XScale processor contributed. 12773 * Port of GCC to Atmel's AVR microcontrollers contributed. 12774 * Port of GCC to Mitsubishi's D30V processor contributed. 12775 * Port of GCC to Matsushita's AM33 processor (a member of the MN10300 12776 processor family) contributed. 12777 * Port of GCC to Fujitsu's FR30 processor contributed. 12778 * Port of GCC to Motorola's 68HC11 and 68HC12 processors contributed. 12779 * Port of GCC to Sun's picoJava processor core contributed. 12780 12781 Documentation improvements 12782 12783 * Substantially rewritten and improved C preprocessor manual. 12784 * Many improvements to other documentation. 12785 * Manpages for gcc, cpp and gcov are now generated automatically from 12786 the master Texinfo manual, eliminating the problem of manpages 12787 being out of date. (The generated manpages are only extracts from 12788 the full manual, which is provided in Texinfo form, from which 12789 info, HTML, other formats and a printed manual can be generated.) 12790 * Generated info files are included in the release tarballs alongside 12791 their Texinfo sources, avoiding problems on some platforms with 12792 building makeinfo as part of the GCC distribution. 12793 12794 Other significant improvements 12795 12796 * Garbage collection used internally by the compiler for most memory 12797 allocation instead of obstacks. 12798 * Lengauer and Tarjan algorithm used for computing dominators in the 12799 CFG. This algorithm can be significantly faster and more space 12800 efficient than our older algorithm. 12801 * gccbug script provided to assist in submitting bug reports to our 12802 bug tracking system. (Bug reports previously submitted directly to 12803 our mailing lists, for which you received no bug tracking number, 12804 should be submitted again using gccbug if you can reproduce the 12805 problem with GCC 3.0.) 12806 * The internal libgcc library is [12]built as a shared library on 12807 systems that support it. 12808 * Extensive testsuite included with GCC, with many new tests. In 12809 addition to tests for GCC bugs that have been fixed, many tests 12810 have been added for language features, compiler warnings and 12811 builtin functions. 12812 * Additional language-independent warning options -Wpacked, -Wpadded, 12813 -Wunreachable-code and -Wdisabled-optimization. 12814 * Target-independent options -falign-functions, -falign-loops and 12815 -falign-jumps. 12816 12817 Plus a great many bug fixes and almost all the [13]features found in 12818 GCC 2.95. 12819 12820 12821 For questions related to the use of GCC, please consult these web 12822 pages and the [14]GCC manuals. If that fails, the 12823 [15]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12824 web pages and the development of GCC are welcome on our developer 12825 list at [16]gcc (a] gcc.gnu.org. All of [17]our lists have public 12826 archives. 12827 12828 Copyright (C) [18]Free Software Foundation, Inc. Verbatim copying and 12829 distribution of this entire article is permitted in any medium, 12830 provided this notice is preserved. 12831 12832 These pages are [19]maintained by the GCC team. Last modified 12833 2014-06-28[20]. 12834 12835 References 12836 12837 1. http://www.netbsd.org/ 12838 2. http://gcc.gnu.org/news/reorder.html 12839 3. http://gcc.gnu.org/news/ssa.html 12840 4. http://gcc.gnu.org/news/null.html 12841 5. http://gcc.gnu.org/news/unify.html 12842 6. http://gcc.gnu.org/gcc-3.0/c++features.html 12843 7. http://gcc.gnu.org/libstdc++/ 12844 8. http://gcc.gnu.org/news/inlining.html 12845 9. http://gcc.gnu.org/news/dependencies.html 12846 10. http://gcc.gnu.org/c99status.html 12847 11. https://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/News.html 12848 12. http://gcc.gnu.org/gcc-3.0/libgcc.html 12849 13. http://gcc.gnu.org/gcc-2.95/features.html 12850 14. https://gcc.gnu.org/onlinedocs/ 12851 15. mailto:gcc-help (a] gcc.gnu.org 12852 16. mailto:gcc (a] gcc.gnu.org 12853 17. https://gcc.gnu.org/lists.html 12854 18. http://www.fsf.org/ 12855 19. https://gcc.gnu.org/about.html 12856 20. http://validator.w3.org/check/referer 12857 ====================================================================== 12858 http://gcc.gnu.org/gcc-3.0/caveats.html 12859 12860 GCC 3.0 Caveats 12861 12862 * -fstrict-aliasing is now part of -O2 and higher optimization 12863 levels. This allows the compiler to assume the strictest aliasing 12864 rules applicable to the language being compiled. For C and C++, 12865 this activates optimizations based on the type of expressions. This 12866 optimization may thus break old, non-compliant code. 12867 * Enumerations are now properly promoted to int in function 12868 parameters and function returns. Normally this change is not 12869 visible, but when using -fshort-enums this is an ABI change. 12870 * The undocumented extension that allowed C programs to have a label 12871 at the end of a compound statement has been deprecated and may be 12872 removed in a future version. Programs that now generate a warning 12873 about this may be fixed by adding a null statement (a single 12874 semicolon) after the label. 12875 * The poorly documented extension that allowed string constants in C, 12876 C++ and Objective C to contain unescaped newlines has been 12877 deprecated and may be removed in a future version. Programs using 12878 this extension may be fixed in several ways: the bare newline may 12879 be replaced by \n, or preceded by \n\, or string concatenation may 12880 be used with the bare newline preceded by \n" and " placed at the 12881 start of the next line. 12882 * The Chill compiler is not included in GCC 3.0, because of the lack 12883 of a volunteer to convert it to use garbage collection. 12884 * Certain non-standard iostream methods from earlier versions of 12885 libstdc++ are not included in libstdc++ v3, i.e. filebuf::attach, 12886 ostream::form, and istream::gets. 12887 * The new C++ ABI is not yet fully supported by current (as of 12888 2001-07-01) releases and development versions of GDB, or any 12889 earlier versions. There is a problem setting breakpoints by line 12890 number, and other related issues that have been fixed in GCC 3.0 12891 but not yet handled in GDB: 12892 [1]https://gcc.gnu.org/ml/gcc-bugs/2001-06/msg00421.html 12893 12894 12895 For questions related to the use of GCC, please consult these web 12896 pages and the [2]GCC manuals. If that fails, the 12897 [3]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12898 web pages and the development of GCC are welcome on our developer 12899 list at [4]gcc (a] gcc.gnu.org. All of [5]our lists have public archives. 12900 12901 Copyright (C) [6]Free Software Foundation, Inc. Verbatim copying and 12902 distribution of this entire article is permitted in any medium, 12903 provided this notice is preserved. 12904 12905 These pages are [7]maintained by the GCC team. Last modified 12906 2014-06-27[8]. 12907 12908 References 12909 12910 1. https://gcc.gnu.org/ml/gcc-bugs/2001-06/msg00421.html 12911 2. https://gcc.gnu.org/onlinedocs/ 12912 3. mailto:gcc-help (a] gcc.gnu.org 12913 4. mailto:gcc (a] gcc.gnu.org 12914 5. https://gcc.gnu.org/lists.html 12915 6. http://www.fsf.org/ 12916 7. https://gcc.gnu.org/about.html 12917 8. http://validator.w3.org/check/referer 12918 ====================================================================== 12919 http://gcc.gnu.org/gcc-2.95/index.html 12920 12921 GCC 2.95 12922 12923 March 16, 2001: The GNU project and the GCC developers are pleased to 12924 announce the release of GCC version 2.95.3. 12925 12926 Release History 12927 12928 GCC 2.95.3 12929 March 16, 2001 12930 12931 GCC 2.95.2 12932 October 27, 1999 12933 12934 GCC 2.95.1 12935 August 19, 1999 12936 12937 GCC 2.95 12938 July 31, 1999. This is the first release of GCC since the April 12939 1999 GCC/EGCS reunification and includes nearly a year's worth 12940 of new development and bugfixes. 12941 12942 References and Acknowledgements 12943 12944 GCC used to stand for the GNU C Compiler, but since the compiler 12945 supports several other languages aside from C, it now stands for the 12946 GNU Compiler Collection. 12947 12948 The whole suite has been extensively [1]regression tested and 12949 [2]package tested. It should be reliable and suitable for widespread 12950 use. 12951 12952 The compiler has several new optimizations, new targets, new languages 12953 and other new features. See the [3]new features page for a more 12954 complete list of new features found in the GCC 2.95 releases. 12955 12956 The sources include installation instructions in both HTML and 12957 plaintext forms in the install directory in the distribution. However, 12958 the most up to date installation instructions and [4]build/test status 12959 are on the web pages. We will update those pages as new information 12960 becomes available. 12961 12962 The GCC developers would like to thank the numerous people that have 12963 contributed new features, test results, bugfixes, etc to GCC. This 12964 [5]amazing group of volunteers is what makes GCC successful. 12965 12966 And finally, we can't in good conscience fail to mention some 12967 [6]caveats to using GCC 2.95. 12968 12969 Download GCC 2.95 from one of our many [7]mirror sites. 12970 12971 For additional information about GCC please see the [8]GCC project web 12972 server or contact the [9]GCC development mailing list. 12973 12974 12975 For questions related to the use of GCC, please consult these web 12976 pages and the [10]GCC manuals. If that fails, the 12977 [11]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12978 web pages and the development of GCC are welcome on our developer 12979 list at [12]gcc (a] gcc.gnu.org. All of [13]our lists have public 12980 archives. 12981 12982 Copyright (C) [14]Free Software Foundation, Inc. Verbatim copying and 12983 distribution of this entire article is permitted in any medium, 12984 provided this notice is preserved. 12985 12986 These pages are [15]maintained by the GCC team. Last modified 12987 2014-06-28[16]. 12988 12989 References 12990 12991 1. http://gcc.gnu.org/gcc-2.95/regress.html 12992 2. http://gcc.gnu.org/gcc-2.95/othertest.html 12993 3. http://gcc.gnu.org/gcc-2.95/features.html 12994 4. http://gcc.gnu.org/gcc-2.95/buildstat.html 12995 5. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12996 6. http://gcc.gnu.org/gcc-2.95/caveats.html 12997 7. http://gcc.gnu.org/mirrors.html 12998 8. http://gcc.gnu.org/index.html 12999 9. mailto:gcc (a] gcc.gnu.org 13000 10. https://gcc.gnu.org/onlinedocs/ 13001 11. mailto:gcc-help (a] gcc.gnu.org 13002 12. mailto:gcc (a] gcc.gnu.org 13003 13. https://gcc.gnu.org/lists.html 13004 14. http://www.fsf.org/ 13005 15. https://gcc.gnu.org/about.html 13006 16. http://validator.w3.org/check/referer 13007 ====================================================================== 13008 http://gcc.gnu.org/gcc-2.95/features.html 13009 13010 GCC 2.95 New Features 13011 13012 * General Optimizer Improvements: 13013 + [1]Localized register spilling to improve speed and code 13014 density especially on small register class machines. 13015 + [2]Global CSE using lazy code motion algorithms. 13016 + [3]Improved global constant/copy propagation. 13017 + [4]Improved control flow graph analysis and manipulation. 13018 + [5]Local dead store elimination. 13019 + [6]Memory Load hoisting/store sinking in loops. 13020 + [7]Type based alias analysis is enabled by default. Note this 13021 feature will expose bugs in the Linux kernel. Please refer to 13022 the FAQ (as shipped with GCC 2.95) for additional information 13023 on this issue. 13024 + Major revamp of GIV detection, combination and simplification 13025 to improve loop performance. 13026 + Major improvements to register allocation and reloading. 13027 * New Languages and Language specific improvements 13028 + [8]Many C++ improvements. 13029 + [9]Many Fortran improvements. 13030 + [10]Java front-end has been integrated. [11]runtime library is 13031 available separately. 13032 + [12]ISO C99 support 13033 + [13]Chill front-end and runtime has been integrated. 13034 + Boehm garbage collector support in libobjc. 13035 + More support for various pragmas which appear in vendor 13036 include files 13037 * New Targets and Target Specific Improvements 13038 + [14]SPARC backend rewrite. 13039 + -mschedule=8000 will optimize code for PA8000 class 13040 processors; -mpa-risc-2-0 will generate code for PA2.0 13041 processors 13042 + Various micro-optimizations for the ia32 port. K6 13043 optimizations 13044 + Compiler will attempt to align doubles in the stack on the 13045 ia32 port 13046 + Alpha EV6 support 13047 + PowerPC 750 13048 + RS6000/PowerPC: -mcpu=401 was added as an alias for -mcpu=403. 13049 -mcpu=e603e was added to do -mcpu=603e and -msoft-float. 13050 + c3x, c4x 13051 + HyperSPARC 13052 + SparcLite86x 13053 + sh4 13054 + Support for new systems (OpenBSD, FreeBSD, UWIN, Interix, 13055 arm-linux) 13056 + vxWorks targets include support for vxWorks threads 13057 + StrongARM 110 and ARM9 support added. ARM Scheduling 13058 parameters rewritten. 13059 + Various changes to the MIPS port to avoid assembler macros, 13060 which in turn improves performance 13061 + Various performance improvements to the i960 port. 13062 + Major rewrite of ns32k port 13063 * Other significant improvements 13064 + [15]Ability to dump cfg information and display it using vcg. 13065 + The new faster scheme for fixing vendor header files is 13066 enabled by default. 13067 + Experimental internationalization support. 13068 + multibyte character support 13069 + Some compile-time speedups for pathological problems 13070 + Better support for complex types 13071 * Plus the usual mountain of bugfixes 13072 * Core compiler is based on the gcc2 development tree from Sept 30, 13073 1998, so we have all of the [16]features found in GCC 2.8. 13074 13075 Additional Changes in GCC 2.95.1 13076 13077 * Generic bugfixes and improvements 13078 + Various documentation fixes related to the GCC/EGCS merger. 13079 + Fix memory management bug which could lead to spurious aborts, 13080 core dumps or random parsing errors in the compiler. 13081 + Fix a couple bugs in the dwarf1 and dwarf2 debug record 13082 support. 13083 + Fix infinite loop in the CSE optimizer. 13084 + Avoid undefined behavior in compiler FP emulation code 13085 + Fix install problem when prefix is overridden on the make 13086 install command. 13087 + Fix problem with unwanted installation of assert.h on some 13088 systems. 13089 + Fix problem with finding the wrong assembler in a single tree 13090 build. 13091 + Avoid increasing the known alignment of a register that is 13092 already known to be a pointer. 13093 * Platform specific bugfixes and improvements 13094 + Codegen bugfix for prologue/epilogue for cpu32 target. 13095 + Fix long long code generation bug for the Coldfire target. 13096 + Fix various aborts in the SH compiler. 13097 + Fix bugs in libgcc support library for the SH. 13098 + Fix alpha ev6 code generation bug. 13099 + Fix problems with EXIT_SUCCESS/EXIT_FAILURE redefinitions on 13100 AIX platforms. 13101 + Fix -fpic code generation bug for rs6000/ppc svr4 targets. 13102 + Fix varargs/stdarg code generation bug for rs6000/ppc svr4 13103 targets. 13104 + Fix weak symbol handling for rs6000/ppc svr4 targets. 13105 + Fix various problems with 64bit code generation for the 13106 rs6000/ppc port. 13107 + Fix codegen bug which caused tetex to be mis-compiled on the 13108 x86. 13109 + Fix compiler abort in new cfg code exposed by x86 port. 13110 + Fix out of range array reference in code convert flat 13111 registers to the x87 stacked FP register file. 13112 + Fix minor vxworks configuration bug. 13113 + Fix return type of bsearch for SunOS 4.x. 13114 * Language & Runtime specific fixes. 13115 + The G++ signature extension has been deprecated. It will be 13116 removed in the next major release of G++. Use of signatures 13117 will result in a warning from the compiler. 13118 + Several bugs relating to templates and namespaces were fixed. 13119 + A bug that caused crashes when combining templates with -g on 13120 DWARF1 platforms was fixed. 13121 + Pointers-to-members, virtual functions, and multiple 13122 inheritance should now work together correctly. 13123 + Some code-generation bugs relating to function try blocks were 13124 fixed. 13125 + G++ is a little bit more lenient with certain archaic 13126 constructs than in GCC 2.95. 13127 + Fix to prevent shared library version #s from bring truncated 13128 to 1 digit 13129 + Fix missing std:: in the libstdc++ library. 13130 + Fix stream locking problems in libio. 13131 + Fix problem in java compiler driver. 13132 13133 Additional Changes in GCC 2.95.2 13134 13135 The -fstrict-aliasing is not enabled by default for GCC 2.95.2. While 13136 the optimizations performed by -fstrict-aliasing are valid according to 13137 the C and C++ standards, the optimization have caused some problems, 13138 particularly with old non-conforming code. 13139 13140 The GCC developers are experimenting with ways to warn users about code 13141 which violates the C/C++ standards, but those warnings are not ready 13142 for widespread use at this time. Rather than wait for those warnings 13143 the GCC developers have chosen to disable -fstrict-aliasing by default 13144 for the GCC 2.95.2 release. 13145 13146 We strongly encourage developers to find and fix code which violates 13147 the C/C++ standards as -fstrict-aliasing may be enabled by default in 13148 future releases. Use the option -fstrict-aliasing to re-enable these 13149 optimizations. 13150 * Generic bugfixes and improvements 13151 + Fix incorrectly optimized memory reference in global common 13152 subexpression elimination (GCSE) optimization pass. 13153 + Fix code generation bug in regmove.c in which it could 13154 incorrectly change a "const" value. 13155 + Fix bug in optimization of conditionals involving volatile 13156 memory references. 13157 + Avoid over-allocation of stack space for some procedures. 13158 + Fixed bug in the compiler which caused incorrect optimization 13159 of an obscure series of bit manipulations, shifts and 13160 arithmetic. 13161 + Fixed register allocator bug which caused teTeX to be 13162 mis-compiled on SPARC targets. 13163 + Avoid incorrect optimization of degenerate case statements for 13164 certain targets such as the ARM. 13165 + Fix out of range memory reference in the jump optimizer. 13166 + Avoid dereferencing null pointer in fix-header. 13167 + Fix test for GCC specific features so that it is possible to 13168 bootstrap with gcc-2.6.2 and older versions of GCC. 13169 + Fix typo in scheduler which could potentially cause out of 13170 range memory accesses. 13171 + Avoid incorrect loop reversal which caused incorrect code for 13172 certain loops on PowerPC targets. 13173 + Avoid incorrect optimization of switch statements on certain 13174 targets (for example the ARM). 13175 * Platform specific bugfixes and improvements 13176 + Work around bug in Sun V5.0 compilers which caused bootstrap 13177 comparison failures on SPARC targets. 13178 + Fix SPARC backend bug which caused aborts in final.c. 13179 + Fix sparc-hal-solaris2* configuration fragments. 13180 + Fix bug in sparc block profiling. 13181 + Fix obscure code generation bug for the PARISC targets. 13182 + Define __STDC_EXT__ for HPUX configurations. 13183 + Various POWERPC64 code generation bugfixes. 13184 + Fix abort for PPC targets using ELF (ex GNU/Linux). 13185 + Fix collect2 problems for AIX targets. 13186 + Correct handling of .file directive for PPC targets. 13187 + Fix bug in fix_trunc x86 patterns. 13188 + Fix x86 port to correctly pop the FP stack for functions that 13189 return structures in memory. 13190 + Fix minor bug in strlen x86 pattern. 13191 + Use stabs debugging instead of dwarf1 for x86-solaris targets. 13192 + Fix template repository code to handle leading underscore in 13193 mangled names. 13194 + Fix weak/weak alias support for OpenBSD. 13195 + GNU/Linux for the ARM has C++ compatible include files. 13196 * Language & Runtime specific fixes. 13197 + Fix handling of constructor attribute in the C front-end which 13198 caused problems building the Chill runtime library on some 13199 targets. 13200 + Fix minor problem merging type qualifiers in the C front-end. 13201 + Fix aliasing bug for pointers and references (C/C++). 13202 + Fix incorrect "non-constant initializer bug" when -traditional 13203 or -fwritable-strings is enabled. 13204 + Fix build error for Chill front-end on SunOS. 13205 + Do not complain about duplicate instantiations when using 13206 -frepo (C++). 13207 + Fix array bounds handling in C++ front-end which caused 13208 problems with dwarf debugging information in some 13209 circumstances. 13210 + Fix minor namespace problem. 13211 + Fix problem linking java programs. 13212 13213 Additional Changes in GCC 2.95.3 13214 13215 * Generic bugfixes and improvements 13216 + Fix numerous problems that caused incorrect optimization in 13217 the register reloading code. 13218 + Fix numerous problems that caused incorrect optimization in 13219 the loop optimizer. 13220 + Fix aborts in the functions build_insn_chain and scan_loops 13221 under some circumstances. 13222 + Fix an alias analysis bug. 13223 + Fix an infinite compilation bug in the combiner. 13224 + A few problems with complex number support have been fixed. 13225 + It is no longer possible for gcc to act as a fork bomb when 13226 installed incorrectly. 13227 + The -fpack-struct option should be recognized now. 13228 + Fixed a bug that caused incorrect code to be generated due to 13229 a lost stack adjustment. 13230 * Platform specific bugfixes and improvements 13231 + Support building ARM toolchains hosted on Windows. 13232 + Fix attribute calculations in ARM toolchains. 13233 + arm-linux support has been improved. 13234 + Fix a PIC failure on sparc targets. 13235 + On ix86 targets, the regparm attribute should now work 13236 reliably. 13237 + Several updates for the h8300 port. 13238 + Fix problem building libio with glibc 2.2. 13239 13240 13241 For questions related to the use of GCC, please consult these web 13242 pages and the [17]GCC manuals. If that fails, the 13243 [18]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13244 web pages and the development of GCC are welcome on our developer 13245 list at [19]gcc (a] gcc.gnu.org. All of [20]our lists have public 13246 archives. 13247 13248 Copyright (C) [21]Free Software Foundation, Inc. Verbatim copying and 13249 distribution of this entire article is permitted in any medium, 13250 provided this notice is preserved. 13251 13252 These pages are [22]maintained by the GCC team. Last modified 13253 2014-06-28[23]. 13254 13255 References 13256 13257 1. http://gcc.gnu.org/news/spill.html 13258 2. http://gcc.gnu.org/news/lcm.html 13259 3. http://gcc.gnu.org/news/cprop.html 13260 4. http://gcc.gnu.org/news/cfg.html 13261 5. http://gcc.gnu.org/news/dse.html 13262 6. http://gcc.gnu.org/news/hoist.html 13263 7. http://gcc.gnu.org/news/alias.html 13264 8. http://gcc.gnu.org/gcc-2.95/c++features.html 13265 9. https://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/News.html 13266 10. http://gcc.gnu.org/java/gcj-announce.txt 13267 11. http://gcc.gnu.org/news/javaannounce.html 13268 12. http://gcc.gnu.org/c99status.html 13269 13. http://gcc.gnu.org/news/chill.html 13270 14. http://gcc.gnu.org/news/sparc.html 13271 15. http://gcc.gnu.org/news/egcs-vcg.html 13272 16. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13273 17. https://gcc.gnu.org/onlinedocs/ 13274 18. mailto:gcc-help (a] gcc.gnu.org 13275 19. mailto:gcc (a] gcc.gnu.org 13276 20. https://gcc.gnu.org/lists.html 13277 21. http://www.fsf.org/ 13278 22. https://gcc.gnu.org/about.html 13279 23. http://validator.w3.org/check/referer 13280 ====================================================================== 13281 http://gcc.gnu.org/gcc-2.95/caveats.html 13282 13283 GCC 2.95 Caveats 13284 13285 * GCC 2.95 will issue an error for invalid asm statements that had 13286 been silently accepted by earlier versions of the compiler. This is 13287 particularly noticeable when compiling older versions of the Linux 13288 kernel (2.0.xx). Please refer to the FAQ (as shipped with GCC 2.95) 13289 for more information on this issue. 13290 * GCC 2.95 implements type based alias analysis to disambiguate 13291 memory references. Some programs, particularly the Linux kernel 13292 violate ANSI/ISO aliasing rules and therefore may not operate 13293 correctly when compiled with GCC 2.95. Please refer to the FAQ (as 13294 shipped with GCC 2.95) for more information on this issue. 13295 * GCC 2.95 has a known bug in its handling of complex variables for 13296 64bit targets. Instead of silently generating incorrect code, GCC 13297 2.95 will issue a fatal error for situations it can not handle. 13298 This primarily affects the Fortran community as Fortran makes more 13299 use of complex variables than C or C++. 13300 * GCC 2.95 has an integrated libstdc++, but does not have an 13301 integrated libg++. Furthermore old libg++ releases will not work 13302 with GCC 2.95. You can retrieve a recent copy of libg++ from the 13303 [1]GCC ftp server. 13304 Note most C++ programs only need libstdc++. 13305 * Exception handling may not work with shared libraries, particularly 13306 on alphas, hppas, rs6000/powerpc and mips based platforms. 13307 Exception handling is known to work on x86 GNU/Linux platforms with 13308 shared libraries. 13309 * In general, GCC 2.95 is more rigorous about rejecting invalid C++ 13310 code or deprecated C++ constructs than G++ 2.7, G++ 2.8, EGCS 1.0, 13311 or EGCS 1.1. As a result it may be necessary to fix C++ code before 13312 it will compile with GCC 2.95. 13313 * G++ is also converting toward the ISO C++ standard; as a result 13314 code which was previously valid (and thus accepted by other 13315 compilers and older versions of g++) may no longer be accepted. The 13316 flag -fpermissive may allow some non-conforming code to compile 13317 with GCC 2.95. 13318 * GCC 2.95 compiled C++ code is not binary compatible with EGCS 13319 1.1.x, EGCS 1.0.x or GCC 2.8.x. 13320 * GCC 2.95 does not have changes from the GCC 2.8 tree that were made 13321 between Sept 30, 1998 and April 30, 1999 (the official end of the 13322 GCC 2.8 project). Future GCC releases will include all the changes 13323 from the defunct GCC 2.8 sources. 13324 13325 13326 For questions related to the use of GCC, please consult these web 13327 pages and the [2]GCC manuals. If that fails, the 13328 [3]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13329 web pages and the development of GCC are welcome on our developer 13330 list at [4]gcc (a] gcc.gnu.org. All of [5]our lists have public archives. 13331 13332 Copyright (C) [6]Free Software Foundation, Inc. Verbatim copying and 13333 distribution of this entire article is permitted in any medium, 13334 provided this notice is preserved. 13335 13336 These pages are [7]maintained by the GCC team. Last modified 13337 2014-06-12[8]. 13338 13339 References 13340 13341 1. ftp://gcc.gnu.org/pub/gcc/infrastructure/libg++-2.8.1.3.tar.gz 13342 2. https://gcc.gnu.org/onlinedocs/ 13343 3. mailto:gcc-help (a] gcc.gnu.org 13344 4. mailto:gcc (a] gcc.gnu.org 13345 5. https://gcc.gnu.org/lists.html 13346 6. http://www.fsf.org/ 13347 7. https://gcc.gnu.org/about.html 13348 8. http://validator.w3.org/check/referer 13349 ====================================================================== 13350 http://gcc.gnu.org/egcs-1.1/index.html 13351 13352 EGCS 1.1 13353 13354 September 3, 1998: We are pleased to announce the release of EGCS 1.1. 13355 December 1, 1998: We are pleased to announce the release of EGCS 1.1.1. 13356 March 15, 1999: We are pleased to announce the release of EGCS 1.1.2. 13357 13358 EGCS is a free software project to further the development of the GNU 13359 compilers using an open development environment. 13360 13361 EGCS 1.1 is a major new release of the EGCS compiler system. It has 13362 been [1]extensively tested and is believed to be stable and suitable 13363 for widespread use. 13364 13365 EGCS 1.1 is based on an June 6, 1998 snapshot of the GCC 2.8 13366 development sources; it contains all of the new features found in GCC 13367 2.8.1 as well as all new development from GCC up to June 6, 1998. 13368 13369 EGCS 1.1 also contains many improvements and features not found in GCC 13370 or in older versions of EGCS: 13371 * Global common subexpression elimination and global constant/copy 13372 propagation (aka [2]gcse) 13373 * Ongoing improvements to the [3]alias analysis support to allow for 13374 better optimizations throughout the compiler. 13375 * Vastly improved [4]C++ compiler and integrated C++ runtime 13376 libraries. 13377 * Fixes for the /tmp symlink race security problems. 13378 * New targets including mips16, arm-thumb and 64 bit PowerPC. 13379 * Improvements to GNU Fortran (g77) compiler and runtime library made 13380 since g77 version 0.5.23. 13381 13382 See the [5]new features page for a more complete list of new features 13383 found in EGCS 1.1 releases. 13384 13385 EGCS 1.1.1 is a minor update to fix several serious problems in EGCS 13386 1.1: 13387 * General improvements and fixes 13388 + Avoid some stack overflows when compiling large functions. 13389 + Avoid incorrect loop invariant code motions. 13390 + Fix some core dumps on Linux kernel code. 13391 + Bring back the imake -Di386 and friends fix from EGCS 1.0.2. 13392 + Fix code generation problem in gcse. 13393 + Various documentation related fixes. 13394 * g++/libstdc++ improvements and fixes 13395 + MT safe EH fix for setjmp/longjmp based exception handling. 13396 + Fix a few bad interactions between optimization and exception 13397 handling. 13398 + Fixes for demangling of template names starting with "__". 13399 + Fix a bug that would fail to run destructors in some cases 13400 with -O2. 13401 + Fix 'new' of classes with virtual bases. 13402 + Fix crash building Qt on the Alpha. 13403 + Fix failure compiling WIFEXITED macro on GNU/Linux. 13404 + Fix some -frepo failures. 13405 * g77 and libf2c improvements and fixes 13406 + Various documentation fixes. 13407 + Avoid compiler crash on RAND intrinsic. 13408 + Fix minor bugs in makefiles exposed by BSD make programs. 13409 + Define _XOPEN_SOURCE for libI77 build to avoid potential 13410 problems on some 64-bit systems. 13411 + Fix problem with implicit endfile on rewind. 13412 + Fix spurious recursive I/O errors. 13413 * platform specific improvements and fixes 13414 + Match all versions of UnixWare7. 13415 + Do not assume x86 SVR4 or UnixWare targets can handle stabs. 13416 + Fix PPC/RS6000 LEGITIMIZE_ADDRESS macro and bug in conversion 13417 from unsigned ints to double precision floats. 13418 + Fix ARM ABI issue with NetBSD. 13419 + Fix a few arm code generation bugs. 13420 + Fixincludes will fix additional broken SCO OpenServer header 13421 files. 13422 + Fix a m68k backend bug which caused invalid offsets in reg+d 13423 addresses. 13424 + Fix problems with 64bit AIX 4.3 support. 13425 + Fix handling of long longs for varargs/stdarg functions on the 13426 ppc. 13427 + Minor fixes to CPP predefines for Windows. 13428 + Fix code generation problems with gpr<->fpr copies for 64bit 13429 ppc. 13430 + Fix a few coldfire code generation bugs. 13431 + Fix some more header file problems on SunOS 4.x. 13432 + Fix assert.h handling for RTEMS. 13433 + Fix Windows handling of TREE_SYMBOL_REFERENCED. 13434 + Fix x86 compiler abort in reg-stack pass. 13435 + Fix cygwin/windows problem with section attributes. 13436 + Fix Alpha code generation problem exposed by SMP Linux 13437 kernels. 13438 + Fix typo in m68k 32->64bit integer conversion. 13439 + Make sure target libraries build with -fPIC for PPC & Alpha 13440 targets. 13441 13442 EGCS 1.1.2 is a minor update to fix several serious problems in EGCS 13443 1.1.1: 13444 * General improvements and fixes 13445 + Fix bug in loop optimizer which caused the SPARC (and 13446 potentially other) ports to segfault. 13447 + Fix infinite recursion in alias analysis and combiner code. 13448 + Fix bug in regclass preferencing. 13449 + Fix incorrect loop reversal which caused incorrect code to be 13450 generated for several targets. 13451 + Fix return value for builtin memcpy. 13452 + Reduce compile time for certain loops which exposed quadratic 13453 behavior in the loop optimizer. 13454 + Fix bug which caused volatile memory to be written multiple 13455 times when only one write was needed/desired. 13456 + Fix compiler abort in caller-save.c 13457 + Fix combiner bug which caused incorrect code generation for 13458 certain division by constant operations. 13459 + Fix incorrect code generation due to a bug in range check 13460 optimizations. 13461 + Fix incorrect code generation due to mis-handling of clobbered 13462 values in CSE. 13463 + Fix compiler abort/segfault due to incorrect register 13464 splitting when unrolling loops. 13465 + Fix code generation involving autoincremented addresses with 13466 ternary operators. 13467 + Work around bug in the scheduler which caused qt to be 13468 mis-compiled on some platforms. 13469 + Fix code generation problems with -fshort-enums. 13470 + Tighten security for temporary files. 13471 + Improve compile time for codes which make heavy use of 13472 overloaded functions. 13473 + Fix multiply defined constructor/destructor symbol problems. 13474 + Avoid setting bogus RPATH environment variable during 13475 bootstrap. 13476 + Avoid GNU-make dependencies in the texinfo subdir. 13477 + Install CPP wrapper script in $(prefix)/bin if --enable-cpp. 13478 --enable-cpp=<dirname> can be used to specify an additional 13479 install directory for the cpp wrapper script. 13480 + Fix CSE bug which caused incorrect label-label refs to appear 13481 on some platforms. 13482 + Avoid linking in EH routines from libgcc if they are not 13483 needed. 13484 + Avoid obscure bug in aliasing code. 13485 + Fix bug in weak symbol handling. 13486 * Platform-specific improvements and fixes 13487 + Fix detection of PPro/PII on Unixware 7. 13488 + Fix compiler segfault when building spec99 and other programs 13489 for SPARC targets. 13490 + Fix code-generation bugs for integer and floating point 13491 conditional move instructions on the PPro/PII. 13492 + Use fixincludes to fix byteorder problems on i?86-*-sysv. 13493 + Fix build failure for the arc port. 13494 + Fix floating point format configuration for i?86-gnu port. 13495 + Fix problems with hppa1.0-hp-hpux10.20 configuration when 13496 threads are enabled. 13497 + Fix coldfire code generation bugs. 13498 + Fix "unrecognized insn" problems for Alpha and PPC ports. 13499 + Fix h8/300 code generation problem with floating point values 13500 in memory. 13501 + Fix unrecognized insn problems for the m68k port. 13502 + Fix namespace-pollution problem for the x86 port. 13503 + Fix problems with old assembler on x86 NeXT systems. 13504 + Fix PIC code-generation problems for the SPARC port. 13505 + Fix minor bug with LONG_CALLS in PowerPC SVR4 support. 13506 + Fix minor ISO namespace violation in Alpha varargs/stdarg 13507 support. 13508 + Fix incorrect "braf" instruction usage for the SH port. 13509 + Fix minor bug in va-sh which prevented its use with -ansi. 13510 + Fix problems recognizing and supporting FreeBSD. 13511 + Handle OpenBSD systems correctly. 13512 + Minor fixincludes fix for Digital UNIX 4.0B. 13513 + Fix problems with ctors/dtors in SCO shared libraries. 13514 + Abort instead of generating incorrect code for PPro/PII 13515 floating point conditional moves. 13516 + Avoid multiply defined symbols on GNU/Linux systems using 13517 libc-5.4.xx. 13518 + Fix abort in alpha compiler. 13519 * Fortran-specific fixes 13520 + Fix the IDate intrinsic (VXT) (in libg2c) so the returned year 13521 is in the documented, non-Y2K-compliant range of 0-99, instead 13522 of being returned as 100 in the year 2000. 13523 + Fix the `Date_and_Time' intrinsic (in libg2c) to return the 13524 milliseconds value properly in Values(8). 13525 + Fix the `LStat' intrinsic (in libg2c) to return device-ID 13526 information properly in SArray(7). 13527 13528 Each release includes installation instructions in both HTML and 13529 plaintext forms (see the INSTALL directory in the toplevel directory of 13530 the distribution). However, we also keep the most up to date 13531 installation instructions and [6]build/test status on our web page. We 13532 will update those pages as new information becomes available. 13533 13534 The EGCS project would like to thank the numerous people that have 13535 contributed new features, test results, bugfixes, etc. This [7]amazing 13536 group of volunteers is what makes EGCS successful. 13537 13538 And finally, we can't in good conscience fail to mention some 13539 [8]caveats to using EGCS 1.1. 13540 13541 Download EGCS from egcs.cygnus.com (USA California). 13542 13543 The EGCS 1.1 release is also available on many mirror sites. 13544 [9]Goto mirror list to find a closer site. 13545 13546 13547 For questions related to the use of GCC, please consult these web 13548 pages and the [10]GCC manuals. If that fails, the 13549 [11]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13550 web pages and the development of GCC are welcome on our developer 13551 list at [12]gcc (a] gcc.gnu.org. All of [13]our lists have public 13552 archives. 13553 13554 Copyright (C) [14]Free Software Foundation, Inc. Verbatim copying and 13555 distribution of this entire article is permitted in any medium, 13556 provided this notice is preserved. 13557 13558 These pages are [15]maintained by the GCC team. Last modified 13559 2014-06-28[16]. 13560 13561 References 13562 13563 1. http://gcc.gnu.org/egcs-1.1/egcs-1.1-test.html 13564 2. http://gcc.gnu.org/news/gcse.html 13565 3. http://gcc.gnu.org/news/alias.html 13566 4. http://gcc.gnu.org/egcs-1.1/c++features.html 13567 5. http://gcc.gnu.org/egcs-1.1/features.html 13568 6. http://gcc.gnu.org/egcs-1.1/buildstat.html 13569 7. https://gcc.gnu.org/onlinedocs/gcc/Contributors.html 13570 8. http://gcc.gnu.org/egcs-1.1/caveats.html 13571 9. http://gcc.gnu.org/mirrors.html 13572 10. https://gcc.gnu.org/onlinedocs/ 13573 11. mailto:gcc-help (a] gcc.gnu.org 13574 12. mailto:gcc (a] gcc.gnu.org 13575 13. https://gcc.gnu.org/lists.html 13576 14. http://www.fsf.org/ 13577 15. https://gcc.gnu.org/about.html 13578 16. http://validator.w3.org/check/referer 13579 ====================================================================== 13580 http://gcc.gnu.org/egcs-1.1/features.html 13581 13582 EGCS 1.1 new features 13583 13584 * Integrated GNU Fortran (g77) compiler and runtime library with 13585 improvements, based on g77 version 0.5.23. 13586 * Vast improvements in the C++ compiler; so many they have [1]page of 13587 their own! 13588 * Compiler implements [2]global common subexpression elimination and 13589 global copy/constant propagation. 13590 * More major improvements in the [3]alias analysis code. 13591 * More major improvements in the exception handling code to improve 13592 performance, lower static overhead and provide the infrastructure 13593 for future improvements. 13594 * The infamous /tmp symlink race security problems have been fixed. 13595 * The regmove optimization pass has been nearly completely rewritten 13596 to improve performance of generated code. 13597 * The compiler now recomputes register usage information before local 13598 register allocation. By providing more accurate information to the 13599 priority based allocator, we get better register allocation. 13600 * The register reloading phase of the compiler optimizes spill code 13601 much better than in previous releases. 13602 * Some bad interactions between the register allocator and 13603 instruction scheduler have been fixed, resulting in much better 13604 code for certain programs. Additionally, we have tuned the 13605 scheduler in various ways to improve performance of generated code 13606 for some architectures. 13607 * The compiler's branch shortening algorithms have been significantly 13608 improved to work better on targets which align jump targets. 13609 * The compiler now supports -Os to prefer optimizing for code space 13610 over optimizing for code speed. 13611 * The compiler will now totally eliminate library calls which compute 13612 constant values. This primarily helps targets with no integer 13613 div/mul support and targets without floating point support. 13614 * The compiler now supports an extensive "--help" option. 13615 * cpplib has been greatly improved and may be suitable for limited 13616 use. 13617 * Memory footprint for the compiler has been significantly reduced 13618 for some pathological cases. 13619 * The time to build EGCS has been improved for certain targets 13620 (particularly the alpha and mips platforms). 13621 * Many infrastructure improvements throughout the compiler, plus the 13622 usual mountain of bugfixes and minor improvements. 13623 * Target dependent improvements: 13624 + SPARC port now includes V8 plus and V9 support as well as 13625 performance tuning for Ultra class machines. The SPARC port 13626 now uses the Haifa scheduler. 13627 + Alpha port has been tuned for the EV6 processor and has an 13628 optimized expansion of memcpy/bzero. The Alpha port now uses 13629 the Haifa scheduler. 13630 + RS6000/PowerPC: support for the Power64 architecture and AIX 13631 4.3. The RS6000/PowerPC port now uses the Haifa scheduler. 13632 + x86: Alignment of static store data and jump targets is per 13633 Intel recommendations now. Various improvements throughout the 13634 x86 port to improve performance on Pentium processors 13635 (including improved epilogue sequences for Pentium chips and 13636 backend improvements which should help register allocation on 13637 all x86 variants. Conditional move support has been fixed and 13638 enabled for PPro processors. The x86 port also better supports 13639 64bit operations now. Unixware 7, a System V Release 5 target, 13640 is now supported and SCO OpenServer targets can support GAS. 13641 + MIPS has improved multiply/multiply-add support and now 13642 includes mips16 ISA support. 13643 + M68k has many micro-optimizations and Coldfire fixes. 13644 * Core compiler is based on the GCC development tree from June 9, 13645 1998, so we have all of the [4]features found in GCC 2.8. 13646 13647 13648 For questions related to the use of GCC, please consult these web 13649 pages and the [5]GCC manuals. If that fails, the 13650 [6]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13651 web pages and the development of GCC are welcome on our developer 13652 list at [7]gcc (a] gcc.gnu.org. All of [8]our lists have public archives. 13653 13654 Copyright (C) [9]Free Software Foundation, Inc. Verbatim copying and 13655 distribution of this entire article is permitted in any medium, 13656 provided this notice is preserved. 13657 13658 These pages are [10]maintained by the GCC team. Last modified 13659 2014-06-12[11]. 13660 13661 References 13662 13663 1. http://gcc.gnu.org/egcs-1.1/c++features.html 13664 2. http://gcc.gnu.org/news/gcse.html 13665 3. http://gcc.gnu.org/news/alias.html 13666 4. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13667 5. https://gcc.gnu.org/onlinedocs/ 13668 6. mailto:gcc-help (a] gcc.gnu.org 13669 7. mailto:gcc (a] gcc.gnu.org 13670 8. https://gcc.gnu.org/lists.html 13671 9. http://www.fsf.org/ 13672 10. https://gcc.gnu.org/about.html 13673 11. http://validator.w3.org/check/referer 13674 ====================================================================== 13675 http://gcc.gnu.org/egcs-1.1/caveats.html 13676 13677 EGCS 1.1 Caveats 13678 13679 * EGCS has an integrated libstdc++, but does not have an integrated 13680 libg++. Furthermore old libg++ releases will not work with EGCS; HJ 13681 Lu has made a libg++-2.8.1.2 snapshot available which may work with 13682 EGCS. 13683 Note most C++ programs only need libstdc++. 13684 * Exception handling may not work with shared libraries, particularly 13685 on alphas, hppas, rs6000/powerpc and mips based platforms. 13686 Exception handling is known to work on x86-linux platforms with 13687 shared libraries. 13688 * Some versions of the Linux kernel have bugs which prevent them from 13689 being compiled or from running when compiled by EGCS. See the FAQ 13690 (as shipped with EGCS 1.1) for additional information. 13691 * In general, EGCS is more rigorous about rejecting invalid C++ code 13692 or deprecated C++ constructs than g++-2.7, g++-2.8 or EGCS 1.0. As 13693 a result it may be necessary to fix C++ code before it will compile 13694 with EGCS. 13695 * G++ is also converting toward the ISO C++ standard; as a result 13696 code which was previously valid (and thus accepted by other 13697 compilers and older versions of g++) may no longer be accepted. 13698 * EGCS 1.1 compiled C++ code is not binary compatible with EGCS 1.0.x 13699 or GCC 2.8.x due to changes necessary to support thread safe 13700 exception handling. 13701 13702 13703 For questions related to the use of GCC, please consult these web 13704 pages and the [1]GCC manuals. If that fails, the 13705 [2]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13706 web pages and the development of GCC are welcome on our developer 13707 list at [3]gcc (a] gcc.gnu.org. All of [4]our lists have public archives. 13708 13709 Copyright (C) [5]Free Software Foundation, Inc. Verbatim copying and 13710 distribution of this entire article is permitted in any medium, 13711 provided this notice is preserved. 13712 13713 These pages are [6]maintained by the GCC team. Last modified 13714 2014-06-12[7]. 13715 13716 References 13717 13718 1. https://gcc.gnu.org/onlinedocs/ 13719 2. mailto:gcc-help (a] gcc.gnu.org 13720 3. mailto:gcc (a] gcc.gnu.org 13721 4. https://gcc.gnu.org/lists.html 13722 5. http://www.fsf.org/ 13723 6. https://gcc.gnu.org/about.html 13724 7. http://validator.w3.org/check/referer 13725 ====================================================================== 13726 http://gcc.gnu.org/egcs-1.0/index.html 13727 13728 EGCS 1.0 13729 13730 December 3, 1997: We are pleased to announce the release of EGCS 1.0. 13731 January 6, 1998: We are pleased to announce the release of EGCS 1.0.1. 13732 March 16, 1998: We are pleased to announce the release of EGCS 1.0.2. 13733 May 15, 1998 We are pleased to announce the release of EGCS 1.0.3. 13734 13735 EGCS is a collaborative effort involving several groups of hackers 13736 using an open development model to accelerate development and testing 13737 of GNU compilers and runtime libraries. 13738 13739 An important goal of EGCS is to allow wide scale testing of 13740 experimental features and optimizations; therefore, EGCS contains some 13741 features and optimizations which are still under development. However, 13742 EGCS has been carefully tested and should be comparable in quality to 13743 most GCC releases. 13744 13745 EGCS 1.0 is based on an August 2, 1997 snapshot of the GCC 2.8 13746 development sources; it contains nearly all of the new features found 13747 in GCC 2.8. 13748 13749 EGCS 1.0 also contains many improvements and features not found in GCC 13750 2.7 and even the GCC 2.8 series (which was released after the original 13751 EGCS 1.0 release). 13752 * Integrated C++ runtime libraries, including support for most major 13753 GNU/Linux systems! 13754 * The integrated libstdc++ library includes a verbatim copy of SGI's 13755 STL release. 13756 * Integrated GNU Fortran compiler. 13757 * New instruction scheduler. 13758 * New alias analysis code. 13759 13760 See the [1]new features page for a more complete list of new features. 13761 13762 EGCS 1.0.1 is a minor update to the EGCS 1.0 compiler to fix a few 13763 critical bugs and add support for Red Hat 5.0 Linux. Changes since the 13764 EGCS 1.0 release: 13765 * Add support for Red Hat 5.0 Linux and better support for Linux 13766 systems using glibc2. 13767 Many programs failed to link when compiled with EGCS 1.0 on Red Hat 13768 5.0 or on systems with newer versions of glibc2. EGCS 1.0.1 should 13769 fix these problems. 13770 * Compatibility with both EGCS 1.0 and GCC 2.8 libgcc exception 13771 handling interfaces. 13772 To avoid future compatibility problems, we strongly urge anyone who 13773 is planning on distributing shared libraries that contain C++ code 13774 to upgrade to EGCS 1.0.1 first. 13775 Soon after EGCS 1.0 was released, the GCC developers made some 13776 incompatible changes in libgcc's exception handling interfaces. 13777 These changes were needed to solve problems on some platforms. This 13778 means that GCC 2.8.0, when released, will not be seamlessly 13779 compatible with shared libraries built by EGCS 1.0. The reason is 13780 that the libgcc.a in GCC 2.8.0 will not contain a function needed 13781 by the old interface. 13782 The result of this is that there may be compatibility problems with 13783 shared libraries built by EGCS 1.0 when used with GCC 2.8.0. 13784 With EGCS 1.0.1, generated code uses the new (GCC 2.8.0) interface, 13785 and libgcc.a has the support routines for both the old and the new 13786 interfaces (so EGCS 1.0.1 and EGCS 1.0 code can be freely mixed, 13787 and EGCS 1.0.1 and GCC 2.8.0 code can be freely mixed). 13788 The maintainers of GCC 2.x have decided against including seamless 13789 support for the old interface in 2.8.0, since it was never 13790 "official", so to avoid future compatibility problems we recommend 13791 against distributing any shared libraries built by EGCS 1.0 that 13792 contain C++ code (upgrade to 1.0.1 and use that). 13793 * Various bugfixes in the x86, hppa, mips, and rs6000/ppc back ends. 13794 The x86 changes fix code generation errors exposed when building 13795 glibc2 and the usual GNU/Linux dynamic linker (ld.so). 13796 The hppa change fixes a compiler abort when configured for use with 13797 RTEMS. 13798 The MIPS changes fix problems with the definition of LONG_MAX on 13799 newer systems, allow for command line selection of the target ABI, 13800 and fix one code generation problem. 13801 The rs6000/ppc change fixes some problems with passing structures 13802 to varargs/stdarg functions. 13803 * A few machine independent bugfixes, mostly to fix code generation 13804 errors when building Linux kernels or glibc. 13805 * Fix a few critical exception handling and template bugs in the C++ 13806 compiler. 13807 * Fix Fortran namelist bug on alphas. 13808 * Fix build problems on x86-solaris systems. 13809 13810 EGCS 1.0.2 is a minor update to the EGCS 1.0.1 compiler to fix several 13811 serious problems in EGCS 1.0.1. 13812 * General improvements and fixes 13813 + Memory consumption significantly reduced, especially for 13814 templates and inline functions. 13815 + Fix various problems with glibc2.1. 13816 + Fix loop optimization bug exposed by rs6000/ppc port. 13817 + Fix to avoid potential code generation problems in jump.c. 13818 + Fix some undefined symbol problems in dwarf1 debug support. 13819 * g++/libstdc++ improvements and fixes 13820 + libstdc++ in the EGCS release has been updated and should be 13821 link compatible with libstdc++-2.8. 13822 + Various fixes in libio/libstdc++ to work better on GNU/Linux 13823 systems. 13824 + Fix problems with duplicate symbols on systems that do not 13825 support weak symbols. 13826 + Memory corruption bug and undefined symbols in bastring have 13827 been fixed. 13828 + Various exception handling fixes. 13829 + Fix compiler abort for very long thunk names. 13830 * g77 improvements and fixes 13831 + Fix compiler crash for omitted bound in Fortran CASE 13832 statement. 13833 + Add missing entries to g77 lang-options. 13834 + Fix problem with -fpedantic in the g77 compiler. 13835 + Fix "backspace" problem with g77 on alphas. 13836 + Fix x86 backend problem with Fortran literals and -fpic. 13837 + Fix some of the problems with negative subscripts for g77 on 13838 alphas. 13839 + Fixes for Fortran builds on cygwin32/mingw32. 13840 * platform specific improvements and fixes 13841 + Fix long double problems on x86 (exposed by glibc). 13842 + x86 ports define i386 again to keep imake happy. 13843 + Fix exception handling support on NetBSD ports. 13844 + Several changes to collect2 to fix many problems with AIX. 13845 + Define __ELF__ for GNU/Linux on rs6000. 13846 + Fix -mcall-linux problem on GNU/Linux on rs6000. 13847 + Fix stdarg/vararg problem for GNU/Linux on rs6000. 13848 + Allow autoconf to select a proper install problem on AIX 3.1. 13849 + m68k port support includes -mcpu32 option as well as cpu32 13850 multilibs. 13851 + Fix stdarg bug for irix6. 13852 + Allow EGCS to build on irix5 without the gnu assembler. 13853 + Fix problem with static linking on sco5. 13854 + Fix bootstrap on sco5 with native compiler. 13855 + Fix for abort building newlib on H8 target. 13856 + Fix fixincludes handling of math.h on SunOS. 13857 + Minor fix for Motorola 3300 m68k systems. 13858 13859 EGCS 1.0.3 is a minor update to the EGCS 1.0.2 compiler to fix a few 13860 problems reported by Red Hat for builds of Red Hat 5.1. 13861 * Generic bugfixes: 13862 + Fix a typo in the libio library which resulted in incorrect 13863 behavior of istream::get. 13864 + Fix the Fortran negative array index problem. 13865 + Fix a major problem with the ObjC runtime thread support 13866 exposed by glibc2. 13867 + Reduce memory consumption of the Haifa scheduler. 13868 * Target specific bugfixes: 13869 + Fix one x86 floating point code generation bug exposed by 13870 glibc2 builds. 13871 + Fix one x86 internal compiler error exposed by glibc2 builds. 13872 + Fix profiling bugs on the Alpha. 13873 + Fix ImageMagick & emacs 20.2 build problems on the Alpha. 13874 + Fix rs6000/ppc bug when converting values from integer types 13875 to floating point types. 13876 13877 The EGCS 1.0 releases include installation instructions in both HTML 13878 and plaintext forms (see the INSTALL directory in the toplevel 13879 directory of the distribution). However, we also keep the most up to 13880 date installation instructions and [2]build/test status on our web 13881 page. We will update those pages as new information becomes available. 13882 13883 And, we can't in good conscience fail to mention some [3]caveats to 13884 using EGCS. 13885 13886 Update: Big thanks to Stanford for providing a high speed link for 13887 downloading EGCS (go.cygnus.com)! 13888 13889 Download EGCS from ftp.cygnus.com (USA California) or go.cygnus.com 13890 (USA California -- High speed link provided by Stanford). 13891 13892 The EGCS 1.0 release is also available many mirror sites. 13893 [4]Goto mirror list to find a closer site 13894 13895 We'd like to thank the numerous people that have contributed new 13896 features, test results, bugfixes, etc. Unfortunately, they're far too 13897 numerous to mention by name. 13898 13899 13900 For questions related to the use of GCC, please consult these web 13901 pages and the [5]GCC manuals. If that fails, the 13902 [6]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13903 web pages and the development of GCC are welcome on our developer 13904 list at [7]gcc (a] gcc.gnu.org. All of [8]our lists have public archives. 13905 13906 Copyright (C) [9]Free Software Foundation, Inc. Verbatim copying and 13907 distribution of this entire article is permitted in any medium, 13908 provided this notice is preserved. 13909 13910 These pages are [10]maintained by the GCC team. Last modified 13911 2014-06-28[11]. 13912 13913 References 13914 13915 1. http://gcc.gnu.org/egcs-1.0/features.html 13916 2. http://gcc.gnu.org/egcs-1.0/buildstat.html 13917 3. http://gcc.gnu.org/egcs-1.0/caveats.html 13918 4. http://gcc.gnu.org/mirrors.html 13919 5. https://gcc.gnu.org/onlinedocs/ 13920 6. mailto:gcc-help (a] gcc.gnu.org 13921 7. mailto:gcc (a] gcc.gnu.org 13922 8. https://gcc.gnu.org/lists.html 13923 9. http://www.fsf.org/ 13924 10. https://gcc.gnu.org/about.html 13925 11. http://validator.w3.org/check/referer 13926 ====================================================================== 13927 http://gcc.gnu.org/egcs-1.0/features.html 13928 13929 EGCS 1.0 features 13930 13931 * Core compiler is based on the gcc2 development tree from Aug 2, 13932 1997, so we have most of the [1]features found in GCC 2.8. 13933 * Integrated GNU Fortran compiler based on g77-0.5.22-19970929. 13934 * Vast improvements in the C++ compiler; so many they have [2]page of 13935 their own! 13936 * Integrated C++ runtime libraries, including support for most major 13937 GNU/Linux systems! 13938 * New instruction scheduler from IBM Haifa which includes support for 13939 function wide instruction scheduling as well as superscalar 13940 scheduling. 13941 * Significantly improved alias analysis code. 13942 * Improved register allocation for two address machines. 13943 * Significant code generation improvements for Fortran code on 13944 Alphas. 13945 * Various optimizations from the g77 project as well as improved loop 13946 optimizations. 13947 * Dwarf2 debug format support for some targets. 13948 * egcs libstdc++ includes the SGI STL implementation without changes. 13949 * As a result of these and other changes, egcs libstc++ is not binary 13950 compatible with previous releases of libstdc++. 13951 * Various new ports -- UltraSPARC, Irix6.2 & Irix6.3 support, The SCO 13952 Openserver 5 family (5.0.{0,2,4} and Internet FastStart 1.0 and 13953 1.1), Support for RTEMS on several embedded targets, Support for 13954 arm-linux, Mitsubishi M32R, Hitachi H8/S, Matsushita MN102 and 13955 MN103, NEC V850, Sparclet, Solaris & GNU/Linux on PowerPCs, etc. 13956 * Integrated testsuites for gcc, g++, g77, libstdc++ and libio. 13957 * RS6000/PowerPC ports generate code which can run on all 13958 RS6000/PowerPC variants by default. 13959 * -mcpu= and -march= switches for the x86 port to allow better 13960 control over how the x86 port generates code. 13961 * Includes the template repository patch (aka repo patch); note the 13962 new template code makes repo obsolete for ELF systems using gnu-ld 13963 such as GNU/Linux. 13964 * Plus the usual assortment of bugfixes and improvements. 13965 13966 13967 For questions related to the use of GCC, please consult these web 13968 pages and the [3]GCC manuals. If that fails, the 13969 [4]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13970 web pages and the development of GCC are welcome on our developer 13971 list at [5]gcc (a] gcc.gnu.org. All of [6]our lists have public archives. 13972 13973 Copyright (C) [7]Free Software Foundation, Inc. Verbatim copying and 13974 distribution of this entire article is permitted in any medium, 13975 provided this notice is preserved. 13976 13977 These pages are [8]maintained by the GCC team. Last modified 13978 2014-06-12[9]. 13979 13980 References 13981 13982 1. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13983 2. http://gcc.gnu.org/egcs-1.0/c++features.html 13984 3. https://gcc.gnu.org/onlinedocs/ 13985 4. mailto:gcc-help (a] gcc.gnu.org 13986 5. mailto:gcc (a] gcc.gnu.org 13987 6. https://gcc.gnu.org/lists.html 13988 7. http://www.fsf.org/ 13989 8. https://gcc.gnu.org/about.html 13990 9. http://validator.w3.org/check/referer 13991 ====================================================================== 13992 http://gcc.gnu.org/egcs-1.0/caveats.html 13993 13994 EGCS 1.0 Caveats 13995 13996 * EGCS has an integrated libstdc++, but does not have an integrated 13997 libg++. Furthermore old libg++ releases will not work with egc; HJ 13998 Lu has made a libg++-2.8.1.2 available which may work with EGCS. 13999 Note most C++ programs only need libstdc++. 14000 * Note that using -pedantic or -Wreturn-type can cause an explosion 14001 in the amount of memory needed for template-heavy C++ code, such as 14002 code that uses STL. Also note that -Wall includes -Wreturn-type, so 14003 if you use -Wall you will need to specify -Wno-return-type to turn 14004 it off. 14005 * Exception handling may not work with shared libraries, particularly 14006 on alphas, hppas, and mips based platforms. Exception handling is 14007 known to work on x86-linux platforms with shared libraries. 14008 * Some versions of the Linux kernel have bugs which prevent them from 14009 being compiled or from running when compiled by EGCS. See the FAQ 14010 (as shipped with EGCS 1.0) for additional information. 14011 * In general, EGCS is more rigorous about rejecting invalid C++ code 14012 or deprecated C++ constructs than G++ 2.7. As a result it may be 14013 necessary to fix C++ code before it will compile with EGCS. 14014 * G++ is also aggressively tracking the C++ standard; as a result 14015 code which was previously valid (and thus accepted by other 14016 compilers and older versions of G++) may no longer be accepted. 14017 * EGCS 1.0 may not work with Red Hat Linux 5.0 on all targets. EGCS 14018 1.0.x and later releases should work with Red Hat Linux 5.0. 14019 14020 14021 For questions related to the use of GCC, please consult these web 14022 pages and the [1]GCC manuals. If that fails, the 14023 [2]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 14024 web pages and the development of GCC are welcome on our developer 14025 list at [3]gcc (a] gcc.gnu.org. All of [4]our lists have public archives. 14026 14027 Copyright (C) [5]Free Software Foundation, Inc. Verbatim copying and 14028 distribution of this entire article is permitted in any medium, 14029 provided this notice is preserved. 14030 14031 These pages are [6]maintained by the GCC team. Last modified 14032 2014-06-12[7]. 14033 14034 References 14035 14036 1. https://gcc.gnu.org/onlinedocs/ 14037 2. mailto:gcc-help (a] gcc.gnu.org 14038 3. mailto:gcc (a] gcc.gnu.org 14039 4. https://gcc.gnu.org/lists.html 14040 5. http://www.fsf.org/ 14041 6. https://gcc.gnu.org/about.html 14042 7. http://validator.w3.org/check/referer 14043 ====================================================================== 14044
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