NEWS revision 1.3
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 May 22, 2014 13 14 The [1]GNU project and the GCC developers are pleased to announce the 15 release of GCC 4.8.3. 16 17 This release is a bug-fix release, containing fixes for regressions in 18 GCC 4.8.2 relative to previous releases of GCC. 19 20 Release History 21 22 GCC 4.8.3 23 May 22, 2014 ([2]changes, [3]documentation) 24 25 GCC 4.8.2 26 October 16, 2013 ([4]changes, [5]documentation) 27 28 GCC 4.8.1 29 May 31, 2013 ([6]changes, [7]documentation) 30 31 GCC 4.8.0 32 March 22, 2013 ([8]changes, [9]documentation) 33 34 References and Acknowledgements 35 36 GCC used to stand for the GNU C Compiler, but since the compiler 37 supports several other languages aside from C, it now stands for the 38 GNU Compiler Collection. 39 40 A list of [10]successful builds is updated as new information becomes 41 available. 42 43 The GCC developers would like to thank the numerous people that have 44 contributed new features, improvements, bug fixes, and other changes as 45 well as test results to GCC. This [11]amazing group of volunteers is 46 what makes GCC successful. 47 48 For additional information about GCC please refer to the [12]GCC 49 project web site or contact the [13]GCC development mailing list. 50 51 To obtain GCC please use [14]our mirror sites or [15]our SVN server. 52 53 54 For questions related to the use of GCC, please consult these web 55 pages and the [16]GCC manuals. If that fails, the 56 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 57 web pages and the development of GCC are welcome on our developer 58 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 59 archives. 60 61 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 62 distribution of this entire article is permitted in any medium, 63 provided this notice is preserved. 64 65 These pages are [21]maintained by the GCC team. Last modified 66 2014-05-22[22]. 67 68 References 69 70 1. http://www.gnu.org/ 71 2. http://gcc.gnu.org/gcc-4.8/changes.html 72 3. http://gcc.gnu.org/onlinedocs/4.8.3/ 73 4. http://gcc.gnu.org/gcc-4.8/changes.html 74 5. http://gcc.gnu.org/onlinedocs/4.8.2/ 75 6. http://gcc.gnu.org/gcc-4.8/changes.html 76 7. http://gcc.gnu.org/onlinedocs/4.8.1/ 77 8. http://gcc.gnu.org/gcc-4.8/changes.html 78 9. http://gcc.gnu.org/onlinedocs/4.8.0/ 79 10. http://gcc.gnu.org/gcc-4.8/buildstat.html 80 11. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 81 12. http://gcc.gnu.org/index.html 82 13. mailto:gcc (a] gcc.gnu.org 83 14. http://gcc.gnu.org/mirrors.html 84 15. http://gcc.gnu.org/svn.html 85 16. http://gcc.gnu.org/onlinedocs/ 86 17. mailto:gcc-help (a] gcc.gnu.org 87 18. mailto:gcc (a] gcc.gnu.org 88 19. http://gcc.gnu.org/lists.html 89 20. http://www.fsf.org/ 90 21. http://gcc.gnu.org/about.html 91 22. http://validator.w3.org/check/referer 92 ====================================================================== 93 http://gcc.gnu.org/gcc-4.8/changes.html 94 95 GCC 4.8 Release Series 96 Changes, New Features, and Fixes 97 98 Caveats 99 100 GCC now uses C++ as its implementation language. This means that to 101 build GCC from sources, you will need a C++ compiler that understands 102 C++ 2003. For more details on the rationale and specific changes, 103 please refer to the [1]C++ conversion page. 104 105 To enable the Graphite framework for loop optimizations you now need 106 CLooG version 0.18.0 and ISL version 0.11.1. Both can be obtained from 107 the [2]GCC infrastructure directory. The installation manual contains 108 more information about requirements to build GCC. 109 110 GCC now uses a more aggressive analysis to derive an upper bound for 111 the number of iterations of loops using constraints imposed by language 112 standards. This may cause non-conforming programs to no longer work as 113 expected, such as SPEC CPU 2006 464.h264ref and 416.gamess. A new 114 option, -fno-aggressive-loop-optimizations, was added to disable this 115 aggressive analysis. In some loops that have known constant number of 116 iterations, but undefined behavior is known to occur in the loop before 117 reaching or during the last iteration, GCC will warn about the 118 undefined behavior in the loop instead of deriving lower upper bound of 119 the number of iterations for the loop. The warning can be disabled with 120 -Wno-aggressive-loop-optimizations. 121 122 On ARM, a bug has been fixed in GCC's implementation of the AAPCS rules 123 for the layout of vectors that could lead to wrong code being 124 generated. Vectors larger than 8 bytes in size are now by default 125 aligned to an 8-byte boundary. This is an ABI change: code that makes 126 explicit use of vector types may be incompatible with binary objects 127 built with older versions of GCC. Auto-vectorized code is not affected 128 by this change. 129 130 On AVR, support has been removed for the command-line option 131 -mshort-calls deprecated in GCC 4.7. 132 133 On AVR, the configure option --with-avrlibc supported since GCC 4.7.2 134 is turned on per default for all non-RTEMS configurations. This option 135 arranges for a better integration of [3]AVR Libc with avr-gcc. For 136 technical details, see [4]PR54461. To turn off the option in non-RTEMS 137 configurations, use --with-avrlibc=no. If the compiler is configured 138 for RTEMS, the option is always turned off. 139 140 More information on porting to GCC 4.8 from previous versions of GCC 141 can be found in the [5]porting guide for this release. 142 143 General Optimizer Improvements (and Changes) 144 145 * DWARF4 is now the default when generating DWARF debug information. 146 When -g is used on a platform that uses DWARF debugging 147 information, GCC will now default to -gdwarf-4 148 -fno-debug-types-section. 149 GDB 7.5, Valgrind 3.8.0 and elfutils 0.154 debug information 150 consumers support DWARF4 by default. Before GCC 4.8 the default 151 version used was DWARF2. To make GCC 4.8 generate an older DWARF 152 version use -g together with -gdwarf-2 or -gdwarf-3. The default 153 for Darwin and VxWorks is still -gdwarf-2 -gstrict-dwarf. 154 * A new general optimization level, -Og, has been introduced. It 155 addresses the need for fast compilation and a superior debugging 156 experience while providing a reasonable level of runtime 157 performance. Overall experience for development should be better 158 than the default optimization level -O0. 159 * A new option -ftree-partial-pre was added to control the partial 160 redundancy elimination (PRE) optimization. This option is enabled 161 by default at the -O3 optimization level, and it makes PRE more 162 aggressive. 163 * The option -fconserve-space has been removed; it was no longer 164 useful on most targets since GCC supports putting variables into 165 BSS without making them common. 166 * The struct reorg and matrix reorg optimizations (command-line 167 options -fipa-struct-reorg and -fipa-matrix-reorg) have been 168 removed. They did not always work correctly, nor did they work with 169 link-time optimization (LTO), hence were only applicable to 170 programs consisting of a single translation unit. 171 * Several scalability bottle-necks have been removed from GCC's 172 optimization passes. Compilation of extremely large functions, e.g. 173 due to the use of the flatten attribute in the "Eigen" C++ linear 174 algebra templates library, is significantly faster than previous 175 releases of GCC. 176 * Link-time optimization (LTO) improvements: 177 + LTO partitioning has been rewritten for better reliability and 178 maintanibility. Several important bugs leading to link 179 failures have been fixed. 180 * Interprocedural optimization improvements: 181 + A new symbol table has been implemented. It builds on existing 182 callgraph and varpool modules and provide a new API. Unusual 183 symbol visibilities and aliases are handled more consistently 184 leading to, for example, more aggressive unreachable code 185 removal with LTO. 186 + The inline heuristic can now bypass limits on the size of of 187 inlined functions when the inlining is particularly 188 profitable. This happens, for example, when loop bounds or 189 array strides get propagated. 190 + Values passed through aggregates (either by value or 191 reference) are now propagated at the inter-procedural level 192 leading to better inlining decisions (for example in the case 193 of Fortran array descriptors) and devirtualization. 194 * [6]AddressSanitizer , a fast memory error detector, has been added 195 and can be enabled via -fsanitize=address. Memory access 196 instructions will be instrumented to detect heap-, stack-, and 197 global-buffer overflow as well as use-after-free bugs. To get nicer 198 stacktraces, use -fno-omit-frame-pointer. The AddressSanitizer is 199 available on IA-32/x86-64/x32/PowerPC/PowerPC64 GNU/Linux and on 200 x86-64 Darwin. 201 * [7]ThreadSanitizer has been added and can be enabled via 202 -fsanitize=thread. Instructions will be instrumented to detect data 203 races. The ThreadSanitizer is available on x86-64 GNU/Linux. 204 * A new local register allocator (LRA) has been implemented, which 205 replaces the 26 year old reload pass and improves generated code 206 quality. For now it is active on the IA-32 and x86-64 targets. 207 * Support for transactional memory has been implemented on the 208 following architectures: IA-32/x86-64, ARM, PowerPC, SH, SPARC, and 209 Alpha. 210 211 New Languages and Language specific improvements 212 213 C family 214 215 * Each diagnostic emitted now includes the original source line and a 216 caret '^' indicating the column. The option 217 -fno-diagnostics-show-caret suppresses this information. 218 * The option -ftrack-macro-expansion=2 is now enabled by default. 219 This allows the compiler to display the macro expansion stack in 220 diagnostics. Combined with the caret information, an example 221 diagnostic showing these two features is: 222 223 t.c:1:94: error: invalid operands to binary < (have `struct mystruct' and `float 224 ') 225 #define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) _ 226 _b = (B); __a < __b ? __b : __a; }) 227 228 ^ 229 t.c:7:7: note: in expansion of macro 'MYMAX' 230 X = MYMAX(P, F); 231 ^ 232 233 * A new -Wsizeof-pointer-memaccess warning has been added (also 234 enabled by -Wall) to warn about suspicious length parameters to 235 certain string and memory built-in functions if the argument uses 236 sizeof. This warning warns e.g. about memset (ptr, 0, sizeof 237 (ptr)); if ptr is not an array, but a pointer, and suggests a 238 possible fix, or about memcpy (&foo, ptr, sizeof (&foo));. 239 * The new option -Wpedantic is an alias for -pedantic, which is now 240 deprecated. The forms -Wno-pedantic, -Werror=pedantic, and 241 -Wno-error=pedantic work in the same way as for any other -W 242 option. One caveat is that -Werror=pedantic is not equivalent to 243 -pedantic-errors, since the latter makes into errors some warnings 244 that are not controlled by -Wpedantic, and the former only affects 245 diagnostics that are disabled when using -Wno-pedantic. 246 * The option -Wshadow no longer warns if a declaration shadows a 247 function declaration, unless the former declares a function or 248 pointer to function, because this is [8]a common and valid case in 249 real-world code. 250 251 C++ 252 253 * G++ now implements the [9]C++11 thread_local keyword; this differs 254 from the GNU __thread keyword primarily in that it allows dynamic 255 initialization and destruction semantics. Unfortunately, this 256 support requires a run-time penalty for references to 257 non-function-local thread_local variables defined in a different 258 translation unit even if they don't need dynamic initialization, so 259 users may want to continue to use __thread for TLS variables with 260 static initialization semantics. 261 If the programmer can be sure that no use of the variable in a 262 non-defining TU needs to trigger dynamic initialization (either 263 because the variable is statically initialized, or a use of the 264 variable in the defining TU will be executed before any uses in 265 another TU), they can avoid this overhead with the 266 -fno-extern-tls-init option. 267 OpenMP threadprivate variables now also support dynamic 268 initialization and destruction by the same mechanism. 269 * G++ now implements the [10]C++11 attribute syntax, e.g. 270 271 [[noreturn]] void f(); 272 273 and also the alignment specifier, e.g. 274 275 alignas(double) int i; 276 277 * G++ now implements [11]C++11 inheriting constructors, e.g. 278 279 struct A { A(int); }; 280 struct B: A { using A::A; }; // defines B::B(int) 281 B b(42); // OK 282 283 * As of GCC 4.8.1, G++ implements the change to decltype semantics 284 from [12]N3276. 285 286 struct A f(); 287 decltype(f()) g(); // OK, return type of f() is not required to be complete. 288 289 * As of GCC 4.8.1, G++ implements [13]C++11 ref-qualifiers, e.g. 290 291 struct A { int f() &; }; 292 int i = A().f(); // error, f() requires an lvalue object 293 294 * G++ now supports a -std=c++1y option for experimentation with 295 features proposed for the next revision of the standard, expected 296 around 2014. Currently the only difference from -std=c++11 is 297 support for return type deduction in normal functions, as proposed 298 in [14]N3386. Status of C++1y features in GCC 4.8 can be found 299 [15]here. 300 * The G++ namespace association extension, __attribute ((strong)), 301 has been deprecated. Inline namespaces should be used instead. 302 * G++ now supports a -fext-numeric-literal option to control whether 303 GNU numeric literal suffixes are accepted as extensions or 304 processed as C++11 user-defined numeric literal suffixes. The flag 305 is on (use suffixes for GNU literals) by default for -std=gnu++*, 306 and -std=c++98. The flag is off (use suffixes for user-defined 307 literals) by default for -std=c++11 and later. 308 309 Runtime Library (libstdc++) 310 311 * [16]Improved experimental support for the new ISO C++ standard, 312 C++11, including: 313 + forward_list meets the allocator-aware container requirements; 314 + this_thread::sleep_for(), this_thread::sleep_until() and 315 this_thread::yield() are defined without requiring the 316 configure option --enable-libstdcxx-time; 317 * Improvements to <random>: 318 + SSE optimized normal_distribution. 319 + Use of hardware RNG instruction for random_device on new x86 320 processors (requires the assembler to support the 321 instruction.) 322 and <ext/random>: 323 + New random number engine simd_fast_mersenne_twister_engine 324 with an optimized SSE implementation. 325 + New random number distributions beta_distribution, 326 normal_mv_distribution, rice_distribution, 327 nakagami_distribution, pareto_distribution, k_distribution, 328 arcsine_distribution, hoyt_distribution. 329 * Added --disable-libstdcxx-verbose configure option to disable 330 diagnostic messages issued when a process terminates abnormally. 331 This may be useful for embedded systems to reduce the size of 332 executables that link statically to the library. 333 334 Fortran 335 336 * Compatibility notice: 337 + Module files: The version of module files (.mod) has been 338 incremented. Fortran MODULEs compiled by earlier GCC versions 339 have to be recompiled, when they are USEd by files compiled 340 with GCC 4.8. GCC 4.8 is not able to read .mod files created 341 by earlier versions; attempting to do so gives an error 342 message. 343 Note: The ABI of the produced assembler data itself has not 344 changed; object files and libraries are fully compatible with 345 older versions except as noted below. 346 + ABI: Some internal names (used in the assembler/object file) 347 have changed for symbols declared in the specification part of 348 a module. If an affected module - or a file using it via use 349 association - is recompiled, the module and all files which 350 directly use such symbols have to be recompiled as well. This 351 change only affects the following kind of module symbols: 352 o Procedure pointers. Note: C-interoperable function 353 pointers (type(c_funptr)) are not affected nor are 354 procedure-pointer components. 355 o Deferred-length character strings. 356 * The [17]BACKTRACE intrinsic subroutine has been added. It shows a 357 backtrace at an arbitrary place in user code; program execution 358 continues normally afterwards. 359 * The [18]-Wc-binding-type warning option has been added (disabled by 360 default). It warns if the a variable might not be C interoperable; 361 in particular, if the variable has been declared using an intrinsic 362 type with default kind instead of using a kind parameter defined 363 for C interoperability in the intrinsic ISO_C_Binding module. 364 Before, this warning was always printed. The -Wc-binding-type 365 option is enabled by -Wall. 366 * The [19]-Wrealloc-lhs and -Wrealloc-lhs-all warning command-line 367 options have been added, which diagnose when code to is inserted 368 for automatic (re)allocation of a variable during assignment. This 369 option can be used to decide whether it is safe to use 370 [20]-fno-realloc-lhs. Additionally, it can be used to find 371 automatic (re)allocation in hot loops. (For arrays, replacing 372 "var=" by "var(:)=" disables the automatic reallocation.) 373 * The [21]-Wcompare-reals command-line option has been added. When 374 this is set, warnings are issued when comparing REAL or COMPLEX 375 types for equality and inequality; consider replacing a == b by 376 abs(a -b) < eps with a suitable eps. -Wcompare-reals is enabled by 377 -Wextra. 378 * The [22]-Wtarget-lifetime command-line option has been added 379 (enabled with -Wall), which warns if the pointer in a pointer 380 assignment might outlive its target. 381 * Reading floating point numbers which use "q" for the exponential 382 (such as 4.0q0) is now supported as vendor extension for better 383 compatibility with old data files. It is strongly recommended to 384 use for I/O the equivalent but standard conforming "e" (such as 385 4.0e0). 386 (For Fortran source code, consider replacing the "q" in 387 floating-point literals by a kind parameter (e.g. 4.0e0_qp with a 388 suitable qp). Note that - in Fortran source code - replacing "q" by 389 a simple "e" is not equivalent.) 390 * The GFORTRAN_TMPDIR environment variable for specifying a 391 non-default directory for files opened with STATUS="SCRATCH", is 392 not used anymore. Instead gfortran checks the POSIX/GNU standard 393 TMPDIR environment variable. If TMPDIR is not defined, gfortran 394 falls back to other methods to determine the directory for 395 temporary files as documented in the [23]user manual. 396 * [24]Fortran 2003: 397 + Support for unlimited polymorphic variables (CLASS(*)) has 398 been added. Nonconstant character lengths are not yet 399 supported. 400 * [25]TS 29113: 401 + Assumed types (TYPE(*)) are now supported. 402 + Experimental support for assumed-rank arrays (dimension(..)) 403 has been added. Note that currently gfortran's own array 404 descriptor is used, which is different from the one defined in 405 TS29113, see [26]gfortran's header file or use the [27]Chasm 406 Language Interoperability Tools. 407 408 Go 409 410 * GCC 4.8.2 provides a complete implementation of the Go 1.1.2 411 release. 412 * GCC 4.8.0 and 4.8.1 implement a preliminary version of the Go 1.1 413 release. The library support is not quite complete. 414 * Go has been tested on GNU/Linux and Solaris platforms for various 415 processors including x86, x86_64, PowerPC, SPARC, and Alpha. It may 416 work on other platforms as well. 417 418 New Targets and Target Specific Improvements 419 420 AArch64 421 422 * A new port has been added to support AArch64, the new 64-bit 423 architecture from ARM. Note that this is a separate port from the 424 existing 32-bit ARM port. 425 * The port provides initial support for the Cortex-A53 and the 426 Cortex-A57 processors with the command line options 427 -mcpu=cortex-a53 and -mcpu=cortex-a57. 428 429 ARM 430 431 * Initial support has been added for the AArch32 extensions defined 432 in the ARMv8 architecture. 433 * Code generation improvements for the Cortex-A7 and Cortex-A15 CPUs. 434 * A new option, -mcpu=marvell-pj4, has been added to generate code 435 for the Marvell PJ4 processor. 436 * The compiler can now automatically generate the VFMA, VFMS, REVSH 437 and REV16 instructions. 438 * A new vectorizer cost model for Advanced SIMD configurations to 439 improve the auto-vectorization strategies used. 440 * The scheduler now takes into account the number of live registers 441 to reduce the amount of spilling that can occur. This should 442 improve code performance in large functions. The limit can be 443 removed by using the option -fno-sched-pressure. 444 * Improvements have been made to the Marvell iWMMX code generation 445 and support for the iWMMX2 SIMD unit has been added. The option 446 -mcpu=iwmmxt2 can be used to enable code generation for the latter. 447 * A number of code generation improvements for Thumb2 to reduce code 448 size when compiling for the M-profile processors. 449 * The RTEMS (arm-rtems) port has been updated to use the EABI. 450 * Code generation support for the old FPA and Maverick floating-point 451 architectures has been removed. Ports that previously relied on 452 these features have also been removed. This includes the targets: 453 + arm*-*-linux-gnu (use arm*-*-linux-gnueabi) 454 + arm*-*-elf (use arm*-*-eabi) 455 + arm*-*-uclinux* (use arm*-*-uclinux*eabi) 456 + arm*-*-ecos-elf (no alternative) 457 + arm*-*-freebsd (no alternative) 458 + arm*-wince-pe* (no alternative). 459 460 AVR 461 462 * Support for the "Embedded C" fixed-point has been added. For 463 details, see the [28]GCC wiki and the [29]user manual. The support 464 is not complete. 465 * A new print modifier %r for register operands in inline assembler 466 is supported. It will print the raw register number without the 467 register prefix 'r': 468 /* Return the most significant byte of 'val', a 64-bit value. */ 469 470 unsigned char msb (long long val) 471 { 472 unsigned char c; 473 __asm__ ("mov %0, %r1+7" : "=r" (c) : "r" (val)); 474 return c; 475 } 476 The inline assembler in this example will generate code like 477 mov r24, 8+7 478 provided c is allocated to R24 and val is allocated to R8...R15. 479 This works because the GNU assembler accepts plain register numbers 480 without register prefix. 481 * Static initializers with 3-byte symbols are supported now: 482 extern const __memx char foo; 483 const __memx void *pfoo = &foo; 484 This requires at least Binutils 2.23. 485 486 IA-32/x86-64 487 488 * Allow -mpreferred-stack-boundary=3 for the x86-64 architecture with 489 SSE extensions disabled. Since the x86-64 ABI requires 16 byte 490 stack alignment, this is ABI incompatible and intended to be used 491 in controlled environments where stack space is an important 492 limitation. This option will lead to wrong code when functions 493 compiled with 16 byte stack alignment (such as functions from a 494 standard library) are called with misaligned stack. In this case, 495 SSE instructions may lead to misaligned memory access traps. In 496 addition, variable arguments will be handled incorrectly for 16 497 byte aligned objects (including x87 long double and __int128), 498 leading to wrong results. You must build all modules with 499 -mpreferred-stack-boundary=3, including any libraries. This 500 includes the system libraries and startup modules. 501 * Support for the new Intel processor codename Broadwell with RDSEED, 502 ADCX, ADOX, PREFETCHW is available through -madx, -mprfchw, 503 -mrdseed command-line options. 504 * Support for the Intel RTM and HLE intrinsics, built-in functions 505 and code generation is available via -mrtm and -mhle. 506 * Support for the Intel FXSR, XSAVE and XSAVEOPT instruction sets. 507 Intrinsics and built-in functions are available via -mfxsr, -mxsave 508 and -mxsaveopt respectively. 509 * New -maddress-mode=[short|long] options for x32. 510 -maddress-mode=short overrides default 64-bit addresses to 32-bit 511 by emitting the 0x67 address-size override prefix. This is the 512 default address mode for x32. 513 * New built-in functions to detect run-time CPU type and ISA: 514 + A built-in function __builtin_cpu_is has been added to detect 515 if the run-time CPU is of a particular type. It returns a 516 positive integer on a match and zero otherwise. It accepts one 517 string literal argument, the CPU name. For example, 518 __builtin_cpu_is("westmere") returns a positive integer if the 519 run-time CPU is an Intel Core i7 Westmere processor. Please 520 refer to the [30]user manual for the list of valid CPU names 521 recognized. 522 + A built-in function __builtin_cpu_supports has been added to 523 detect if the run-time CPU supports a particular ISA feature. 524 It returns a positive integer on a match and zero otherwise. 525 It accepts one string literal argument, the ISA feature. For 526 example, __builtin_cpu_supports("ssse3") returns a positive 527 integer if the run-time CPU supports SSSE3 instructions. 528 Please refer to the [31]user manual for the list of valid ISA 529 names recognized. 530 Caveat: If these built-in functions are called before any static 531 constructors are invoked, like during IFUNC initialization, then 532 the CPU detection initialization must be explicitly run using this 533 newly provided built-in function, __builtin_cpu_init. The 534 initialization needs to be done only once. For example, this is how 535 the invocation would look like inside an IFUNC initializer: 536 static void (*some_ifunc_resolver(void))(void) 537 { 538 __builtin_cpu_init(); 539 if (__builtin_cpu_is("amdfam10h") ... 540 if (__builtin_cpu_supports("popcnt") ... 541 } 542 543 * Function Multiversioning Support with G++: 544 It is now possible to create multiple function versions each 545 targeting a specific processor and/or ISA. Function versions have 546 the same signature but different target attributes. For example, 547 here is a program with function versions: 548 __attribute__ ((target ("default"))) 549 int foo(void) 550 { 551 return 1; 552 } 553 554 __attribute__ ((target ("sse4.2"))) 555 int foo(void) 556 { 557 return 2; 558 } 559 560 int main (void) 561 { 562 int (*p) = &foo; 563 assert ((*p)() == foo()); 564 return 0; 565 } 566 567 Please refer to this [32]wiki for more information. 568 * The x86 back end has been improved to allow option -fschedule-insns 569 to work reliably. This option can be used to schedule instructions 570 better and leads to improved performace in certain cases. 571 * Windows MinGW-w64 targets (*-w64-mingw*) require at least r5437 572 from the Mingw-w64 trunk. 573 * Support for new AMD family 15h processors (Steamroller core) is now 574 available through the -march=bdver3 and -mtune=bdver3 options. 575 * Support for new AMD family 16h processors (Jaguar core) is now 576 available through the -march=btver2 and -mtune=btver2 options. 577 578 FRV 579 580 * This target now supports the -fstack-usage command-line option. 581 582 MIPS 583 584 * GCC can now generate code specifically for the R4700, Broadcom XLP 585 and MIPS 34kn processors. The associated -march options are 586 -march=r4700, -march=xlp and -march=34kn respectively. 587 * GCC now generates better DSP code for MIPS 74k cores thanks to 588 further scheduling optimizations. 589 * The MIPS port now supports the -fstack-check option. 590 * GCC now passes the -mmcu and -mno-mcu options to the assembler. 591 * Previous versions of GCC would silently accept -fpic and -fPIC for 592 -mno-abicalls targets like mips*-elf. This combination was not 593 intended or supported, and did not generate position-independent 594 code. GCC 4.8 now reports an error when this combination is used. 595 596 PowerPC / PowerPC64 / RS6000 597 598 * SVR4 configurations (GNU/Linux, FreeBSD, NetBSD) no longer save, 599 restore or update the VRSAVE register by default. The respective 600 operating systems manage the VRSAVE register directly. 601 * Large TOC support has been added for AIX through the command line 602 option -mcmodel=large. 603 * Native Thread-Local Storage support has been added for AIX. 604 * VMX (Altivec) and VSX instruction sets now are enabled implicitly 605 when targetting processors that support those hardware features on 606 AIX 6.1 and above. 607 608 RX 609 610 * This target will now issue a warning message whenever multiple fast 611 interrupt handlers are found in the same compilation unit. This 612 feature can be turned off by the new 613 -mno-warn-multiple-fast-interrupts command-line option. 614 615 S/390, System z 616 617 * Support for the IBM zEnterprise zEC12 processor has been added. 618 When using the -march=zEC12 option, the compiler will generate code 619 making use of the following new instructions: 620 + load and trap instructions 621 + 2 new compare and trap instructions 622 + rotate and insert selected bits - without CC clobber 623 The -mtune=zEC12 option enables zEC12 specific instruction 624 scheduling without making use of new instructions. 625 * Register pressure sensitive instruction scheduling is enabled by 626 default. 627 * The ifunc function attribute is enabled by default. 628 * memcpy and memcmp invokations on big memory chunks or with run time 629 lengths are not generated inline anymore when tuning for z10 or 630 higher. The purpose is to make use of the IFUNC optimized versions 631 in Glibc. 632 633 SH 634 635 * The default alignment settings have been reduced to be less 636 aggressive. This results in more compact code for optimization 637 levels other than -Os. 638 * Improved support for the __atomic built-in functions: 639 + A new option -matomic-model=model selects the model for the 640 generated atomic sequences. The following models are 641 supported: 642 643 soft-gusa 644 Software gUSA sequences (SH3* and SH4* only). On 645 SH4A targets this will now also partially utilize 646 the movco.l and movli.l instructions. This is the 647 default when the target is sh3*-*-linux* or 648 sh4*-*-linux*. 649 650 hard-llcs 651 Hardware movco.l / movli.l sequences (SH4A only). 652 653 soft-tcb 654 Software thread control block sequences. 655 656 soft-imask 657 Software interrupt flipping sequences (privileged 658 mode only). This is the default when the target is 659 sh1*-*-linux* or sh2*-*-linux*. 660 661 none 662 Generates function calls to the respective __atomic 663 built-in functions. This is the default for SH64 664 targets or when the target is not sh*-*-linux*. 665 666 + The option -msoft-atomic has been deprecated. It is now an 667 alias for -matomic-model=soft-gusa. 668 + A new option -mtas makes the compiler generate the tas.b 669 instruction for the __atomic_test_and_set built-in function 670 regardless of the selected atomic model. 671 + The __sync functions in libgcc now reflect the selected atomic 672 model when building the toolchain. 673 * Added support for the mov.b and mov.w instructions with 674 displacement addressing. 675 * Added support for the SH2A instructions movu.b and movu.w. 676 * Various improvements to code generated for integer arithmetic. 677 * Improvements to conditional branches and code that involves the T 678 bit. A new option -mzdcbranch tells the compiler to favor 679 zero-displacement branches. This is enabled by default for SH4* 680 targets. 681 * The pref instruction will now be emitted by the __builtin_prefetch 682 built-in function for SH3* targets. 683 * The fmac instruction will now be emitted by the fmaf standard 684 function and the __builtin_fmaf built-in function. 685 * The -mfused-madd option has been deprecated in favor of the 686 machine-independent -ffp-contract option. Notice that the fmac 687 instruction will now be generated by default for expressions like a 688 * b + c. This is due to the compiler default setting 689 -ffp-contract=fast. 690 * Added new options -mfsrra and -mfsca to allow the compiler using 691 the fsrra and fsca instructions on targets other than SH4A (where 692 they are already enabled by default). 693 * Added support for the __builtin_bswap32 built-in function. It is 694 now expanded as a sequence of swap.b and swap.w instructions 695 instead of a library function call. 696 * The behavior of the -mieee option has been fixed and the negative 697 form -mno-ieee has been added to control the IEEE conformance of 698 floating point comparisons. By default -mieee is now enabled and 699 the option -ffinite-math-only implicitly sets -mno-ieee. 700 * Added support for the built-in functions __builtin_thread_pointer 701 and __builtin_set_thread_pointer. This assumes that GBR is used to 702 hold the thread pointer of the current thread. Memory loads and 703 stores relative to the address returned by __builtin_thread_pointer 704 will now also utilize GBR based displacement address modes. 705 * The -mdiv= option for targets other than SHmedia has been fixed and 706 documented. 707 708 SPARC 709 710 * Added optimized instruction scheduling for Niagara4. 711 712 TILE-Gx 713 714 * Added support for the -mcmodel=MODEL command-line option. The 715 models supported are small and large. 716 717 V850 718 719 * This target now supports the E3V5 architecture via the use of the 720 new -mv850e3v5 command-line option. It also has experimental 721 support for the e3v5 LOOP instruction which can be enabled via the 722 new -mloop command-line option. 723 724 XStormy16 725 726 * This target now supports the -fstack-usage command-line option. 727 728 Operating Systems 729 730 Windows (Cygwin) 731 732 * Executables are now linked against shared libgcc by default. The 733 previous default was to link statically, which can still be done by 734 explicitly specifying -static or static-libgcc on the command line. 735 However it is strongly advised against, as it will cause problems 736 for any application that makes use of DLLs compiled by GCC. It 737 should be alright for a monolithic stand-alone application that 738 only links against the Windows DLLs, but offers little or no 739 benefit. 740 741 GCC 4.8.1 742 743 This is the [33]list of problem reports (PRs) from GCC's bug tracking 744 system that are known to be fixed in the 4.8.1 release. This list might 745 not be complete (that is, it is possible that some PRs that have been 746 fixed are not listed here). 747 748 The C++11 <chrono> std::chrono::system_clock and 749 std::chrono::steady_clock classes have changed ABI in GCC 4.8.1, they 750 both are now separate (never typedefs of each other), both use 751 std::chrono::nanoseconds resolution, on most GNU/Linux configurations 752 std::chrono::steady_clock is now finally monotonic, and both classes 753 are mangled differently than in the previous GCC releases. 754 std::chrono::system_clock::now() with std::chrono::microseconds resp. 755 std::chrono::seconds resolution is still exported for backwards 756 compatibility with default configured libstdc++. Note that libstdc++ 757 configured with --enable-libstdcxx-time= used to be ABI incompatible 758 with default configured libstdc++ for those two classes and no ABI 759 compatibility can be offered for those configurations, so any C++11 760 code that uses those classes and has been compiled and linked against 761 libstdc++ configured with the non-default --enable-libstdcxx-time= 762 configuration option needs to be recompiled. 763 764 GCC 4.8.2 765 766 This is the [34]list of problem reports (PRs) from GCC's bug tracking 767 system that are known to be fixed in the 4.8.2 release. This list might 768 not be complete (that is, it is possible that some PRs that have been 769 fixed are not listed here). 770 771 GCC 4.8.3 772 773 This is the [35]list of problem reports (PRs) from GCC's bug tracking 774 system that are known to be fixed in the 4.8.3 release. This list might 775 not be complete (that is, it is possible that some PRs that have been 776 fixed are not listed here). 777 778 Support for the new powerpc64le-linux platform has been added. It 779 defaults to generating code that conforms to the ELFV2 ABI. 780 781 782 For questions related to the use of GCC, please consult these web 783 pages and the [36]GCC manuals. If that fails, the 784 [37]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 785 web pages and the development of GCC are welcome on our developer 786 list at [38]gcc (a] gcc.gnu.org. All of [39]our lists have public 787 archives. 788 789 Copyright (C) [40]Free Software Foundation, Inc. Verbatim copying and 790 distribution of this entire article is permitted in any medium, 791 provided this notice is preserved. 792 793 These pages are [41]maintained by the GCC team. Last modified 794 2014-05-22[42]. 795 796 References 797 798 1. http://gcc.gnu.org/wiki/cxx-conversion 799 2. ftp://gcc.gnu.org/pub/gcc/infrastructure/ 800 3. http://www.nongnu.org/avr-libc/ 801 4. http://gcc.gnu.org/PR54461 802 5. http://gcc.gnu.org/gcc-4.8/porting_to.html 803 6. https://code.google.com/p/address-sanitizer/ 804 7. https://code.google.com/p/data-race-test/wiki/ThreadSanitizer 805 8. https://lkml.org/lkml/2006/11/28/239 806 9. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 807 10. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 808 11. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 809 12. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf 810 13. http://gcc.gnu.org/gcc-4.8/cxx0x_status.html 811 14. http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2012/n3386.html 812 15. http://gcc.gnu.org/projects/cxx1y.html 813 16. http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011 814 17. http://gcc.gnu.org/onlinedocs/gfortran/BACKTRACE.html 815 18. http://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 816 19. http://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 817 20. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html 818 21. http://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 819 22. http://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html 820 23. http://gcc.gnu.org/onlinedocs/gfortran/TMPDIR.html 821 24. http://gcc.gnu.org/wiki/Fortran2003Status 822 25. http://gcc.gnu.org/wiki/TS29113Status 823 26. http://gcc.gnu.org/viewcvs/trunk/libgfortran/libgfortran.h?content-type=text%2Fplain&view=co 824 27. http://chasm-interop.sourceforge.net/ 825 28. http://gcc.gnu.org/wiki/avr-gcc#Fixed-Point_Support 826 29. http://gcc.gnu.org/onlinedocs/gcc/Fixed-Point.html 827 30. http://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html#X86-Built-in-Functions 828 31. http://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html#X86-Built-in-Functions 829 32. http://gcc.gnu.org/wiki/FunctionMultiVersioning 830 33. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.1 831 34. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.2 832 35. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.8.3 833 36. http://gcc.gnu.org/onlinedocs/ 834 37. mailto:gcc-help (a] gcc.gnu.org 835 38. mailto:gcc (a] gcc.gnu.org 836 39. http://gcc.gnu.org/lists.html 837 40. http://www.fsf.org/ 838 41. http://gcc.gnu.org/about.html 839 42. http://validator.w3.org/check/referer 840 ====================================================================== 841 http://gcc.gnu.org/gcc-4.7/index.html 842 843 GCC 4.7 Release Series 844 845 April 11, 2013 846 847 The [1]GNU project and the GCC developers are pleased to announce the 848 release of GCC 4.7.3. 849 850 This release is a bug-fix release, containing fixes for regressions in 851 GCC 4.7.2 relative to previous releases of GCC. 852 853 Release History 854 855 GCC 4.7.3 856 April 11, 2013 ([2]changes, [3]documentation) 857 858 GCC 4.7.2 859 September 20, 2012 ([4]changes, [5]documentation) 860 861 GCC 4.7.1 862 June 14, 2012 ([6]changes, [7]documentation) 863 864 GCC 4.7.0 865 March 22, 2012 ([8]changes, [9]documentation) 866 867 References and Acknowledgements 868 869 GCC used to stand for the GNU C Compiler, but since the compiler 870 supports several other languages aside from C, it now stands for the 871 GNU Compiler Collection. 872 873 A list of [10]successful builds is updated as new information becomes 874 available. 875 876 The GCC developers would like to thank the numerous people that have 877 contributed new features, improvements, bug fixes, and other changes as 878 well as test results to GCC. This [11]amazing group of volunteers is 879 what makes GCC successful. 880 881 For additional information about GCC please refer to the [12]GCC 882 project web site or contact the [13]GCC development mailing list. 883 884 To obtain GCC please use [14]our mirror sites or [15]our SVN server. 885 886 887 For questions related to the use of GCC, please consult these web 888 pages and the [16]GCC manuals. If that fails, the 889 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 890 web pages and the development of GCC are welcome on our developer 891 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 892 archives. 893 894 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 895 distribution of this entire article is permitted in any medium, 896 provided this notice is preserved. 897 898 These pages are [21]maintained by the GCC team. Last modified 899 2013-04-11[22]. 900 901 References 902 903 1. http://www.gnu.org/ 904 2. http://gcc.gnu.org/gcc-4.7/changes.html 905 3. http://gcc.gnu.org/onlinedocs/4.7.3/ 906 4. http://gcc.gnu.org/gcc-4.7/changes.html 907 5. http://gcc.gnu.org/onlinedocs/4.7.2/ 908 6. http://gcc.gnu.org/gcc-4.7/changes.html 909 7. http://gcc.gnu.org/onlinedocs/4.7.1/ 910 8. http://gcc.gnu.org/gcc-4.7/changes.html 911 9. http://gcc.gnu.org/onlinedocs/4.7.0/ 912 10. http://gcc.gnu.org/gcc-4.7/buildstat.html 913 11. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 914 12. http://gcc.gnu.org/index.html 915 13. mailto:gcc (a] gcc.gnu.org 916 14. http://gcc.gnu.org/mirrors.html 917 15. http://gcc.gnu.org/svn.html 918 16. http://gcc.gnu.org/onlinedocs/ 919 17. mailto:gcc-help (a] gcc.gnu.org 920 18. mailto:gcc (a] gcc.gnu.org 921 19. http://gcc.gnu.org/lists.html 922 20. http://www.fsf.org/ 923 21. http://gcc.gnu.org/about.html 924 22. http://validator.w3.org/check/referer 925 ====================================================================== 926 http://gcc.gnu.org/gcc-4.7/changes.html 927 928 GCC 4.7 Release Series 929 Changes, New Features, and Fixes 930 931 Caveats 932 933 * The -fconserve-space flag has been deprecated. The flag had no 934 effect for most targets: only targets without a global .bss section 935 and without support for switchable sections. Furthermore, the flag 936 only had an effect for G++, where it could result in wrong 937 semantics (please refer to the GCC manual for further details). The 938 flag will be removed in GCC 4.8 939 * Support for a number of older systems and recently unmaintained or 940 untested target ports of GCC has been declared obsolete in GCC 4.7. 941 Unless there is activity to revive them, the next release of GCC 942 will have their sources permanently removed. 943 All GCC ports for the following processor architectures have been 944 declared obsolete: 945 + picoChip (picochip-*) 946 The following ports for individual systems on particular 947 architectures have been obsoleted: 948 + IRIX 6.5 (mips-sgi-irix6.5) 949 + MIPS OpenBSD (mips*-*-openbsd*) 950 + Solaris 8 (*-*-solaris2.8). Details can be found in the 951 [1]announcement. 952 + Tru64 UNIX V5.1 (alpha*-dec-osf5.1*) 953 * On ARM, when compiling for ARMv6 (but not ARMv6-M), ARMv7-A, 954 ARMv7-R, or ARMv7-M, the new option -munaligned-access is active by 955 default, which for some sources generates code that accesses memory 956 on unaligned addresses. This requires the kernel of those systems 957 to enable such accesses (controlled by CP15 register c1, refer to 958 ARM documentation). Alternatively, or for compatibility with 959 kernels where unaligned accesses are not supported, all code has to 960 be compiled with -mno-unaligned-access. Upstream Linux kernel 961 releases have automatically and unconditionally supported unaligned 962 accesses as emitted by GCC due to this option being active since 963 version 2.6.28. 964 * Support on ARM for the legacy floating-point accelerator (FPA) and 965 the mixed-endian floating-point format that it used has been 966 obsoleted. The ports that still use this format have been obsoleted 967 as well. Many legacy ARM ports already provide an alternative that 968 uses the VFP floating-point format. The obsolete ports will be 969 deleted in the next release. 970 The obsolete ports with alternatives are: 971 + arm*-*-rtems (use arm*-*-rtemseabi) 972 + arm*-*-linux-gnu (use arm*-*-linux-gnueabi) 973 + arm*-*-elf (use arm*-*-eabi) 974 + arm*-*-uclinux* (use arm*-*-uclinux*eabi) 975 Note, however, that these alternatives are not binary compatible 976 with their legacy counterparts (although some can support running 977 legacy applications). 978 The obsolete ports that currently lack a modern alternative are: 979 + arm*-*-ecos-elf 980 + arm*-*-freebsd 981 + arm*-wince-pe* 982 New ports that support more recent versions of the architecture are 983 welcome. 984 * Support for the Maverick co-processor on ARM has been obsoleted. 985 Code to support it will be deleted in the next release. 986 * Support has been removed for Unix International threads on Solaris 987 2, so the --enable-threads=solaris configure option and the 988 -threads compiler option don't work any longer. 989 * Support has been removed for the Solaris BSD Compatibility Package, 990 which lives in /usr/ucbinclude and /usr/ucblib. It has been removed 991 from Solaris 11, and was only intended as a migration aid from 992 SunOS 4 to SunOS 5. The -compat-bsd compiler option is not 993 recognized any longer. 994 * The AVR port's libgcc has been improved and its multilib structure 995 has been enhanced. As a result, all objects contributing to an 996 application must either be compiled with GCC versions up to 4.6.x 997 or with GCC versions 4.7.1 or later. If the compiler is used with 998 AVR Libc, you need a version that supports the new layout, i.e. 999 implements [2]#35407. 1000 * The AVR port's -mshort-calls command-line option has been 1001 deprecated. It will be removed in the GCC 4.8 release. See -mrelax 1002 for a replacement. 1003 * The AVR port only references startup code that clears .bss and the 1004 common section resp. initializes the .data and .rodata section 1005 provided respective sections (or subsections thereof) are not 1006 empty, see [3]PR18145. Applications that put all static storage 1007 objects into non-standard sections and / or define all static 1008 storage objects in assembler modules, must reference __do_clear_bss 1009 resp. __do_copy_data by hand or undefine the symbol(s) by means of 1010 -Wl,-u,__do_clear_bss resp. -Wl,-u,__do_copy_data. 1011 * The ARM port's -mwords-little-endian option has been deprecated. It 1012 will be removed in a future release. 1013 * Support has been removed for the NetWare x86 configuration 1014 obsoleted in GCC 4.6. 1015 * It is no longer possible to use the "l" constraint in MIPS16 asm 1016 statements. 1017 * GCC versions 4.7.0 and 4.7.1 had changes to the C++ standard 1018 library which affected the ABI in C++11 mode: a data member was 1019 added to std::list changing its size and altering the definitions 1020 of some member functions, and std::pair's move constructor was 1021 non-trivial which altered the calling convention for functions with 1022 std::pair arguments or return types. The ABI incompatibilities have 1023 been fixed for GCC version 4.7.2 but as a result C++11 code 1024 compiled with GCC 4.7.0 or 4.7.1 may be incompatible with C++11 1025 code compiled with different GCC versions and with C++98/C++03 code 1026 compiled with any version. 1027 * On ARM, a bug has been fixed in GCC's implementation of the AAPCS 1028 rules for the layout of vectors that could lead to wrong code being 1029 generated. Vectors larger than 8 bytes in size are now by default 1030 aligned to an 8-byte boundary. This is an ABI change: code that 1031 makes explicit use of vector types may be incompatible with binary 1032 objects built with older versions of GCC. Auto-vectorized code is 1033 not affected by this change. (This change affects GCC versions 1034 4.7.2 and later.) 1035 * More information on porting to GCC 4.7 from previous versions of 1036 GCC can be found in the [4]porting guide for this release. 1037 1038 General Optimizer Improvements 1039 1040 * Support for a new parameter --param case-values-threshold=n was 1041 added to allow users to control the cutoff between doing switch 1042 statements as a series of if statements and using a jump table. 1043 * Link-time optimization (LTO) improvements: 1044 + Improved scalability and reduced memory usage. Link time 1045 optimization of Firefox now requires 3GB of RAM on a 64-bit 1046 system, while over 8GB was needed previously. Linking time has 1047 been improved, too. The serial stage of linking Firefox has 1048 been sped up by about a factor of 10. 1049 + Reduced size of object files and temporary storage used during 1050 linking. 1051 + Streaming performance (both outbound and inbound) has been 1052 improved. 1053 + ld -r is now supported with LTO. 1054 + Several bug fixes, especially in symbol table handling and 1055 merging. 1056 * Interprocedural optimization improvements: 1057 + Heuristics now take into account that after inlining code will 1058 be optimized out because of known values (or properties) of 1059 function parameters. For example: 1060 void foo(int a) 1061 { 1062 if (a > 10) 1063 ... huge code ... 1064 } 1065 void bar (void) 1066 { 1067 foo (0); 1068 } 1069 1070 The call of foo will be inlined into bar even when optimizing 1071 for code size. Constructs based on __builtin_constant_p are 1072 now understood by the inliner and code size estimates are 1073 evaluated a lot more realistically. 1074 + The representation of C++ virtual thunks and aliases (both 1075 implicit and defined via the alias attribute) has been 1076 re-engineered. Aliases no longer pose optimization barriers 1077 and calls to an alias can be inlined and otherwise optimized. 1078 + The inter-procedural constant propagation pass has been 1079 rewritten. It now performs generic function specialization. 1080 For example when compiling the following: 1081 void foo(bool flag) 1082 { 1083 if (flag) 1084 ... do something ... 1085 else 1086 ... do something else ... 1087 } 1088 void bar (void) 1089 { 1090 foo (false); 1091 foo (true); 1092 foo (false); 1093 foo (true); 1094 foo (false); 1095 foo (true); 1096 } 1097 1098 GCC will now produce two copies of foo. One with flag being 1099 true, while other with flag being false. This leads to 1100 performance improvements previously possible only by inlining 1101 all calls. Cloning causes a lot less code size growth. 1102 * A string length optimization pass has been added. It attempts to 1103 track string lengths and optimize various standard C string 1104 functions like strlen, strchr, strcpy, strcat, stpcpy and their 1105 _FORTIFY_SOURCE counterparts into faster alternatives. This pass is 1106 enabled by default at -O2 or above, unless optimizing for size, and 1107 can be disabled by the -fno-optimize-strlen option. The pass can 1108 e.g. optimize 1109 char *bar (const char *a) 1110 { 1111 size_t l = strlen (a) + 2; 1112 char *p = malloc (l); if (p == NULL) return p; 1113 strcpy (p, a); strcat (p, "/"); return p; 1114 } 1115 1116 into: 1117 char *bar (const char *a) 1118 { 1119 size_t tmp = strlen (a); 1120 char *p = malloc (tmp + 2); if (p == NULL) return p; 1121 memcpy (p, a, tmp); memcpy (p + tmp, "/", 2); return p; 1122 } 1123 1124 or for hosted compilations where stpcpy is available in the runtime 1125 and headers provide its prototype, e.g. 1126 void foo (char *a, const char *b, const char *c, const char *d) 1127 { 1128 strcpy (a, b); strcat (a, c); strcat (a, d); 1129 } 1130 1131 can be optimized into: 1132 void foo (char *a, const char *b, const char *c, const char *d) 1133 { 1134 strcpy (stpcpy (stpcpy (a, b), c), d); 1135 } 1136 1137 New Languages and Language specific improvements 1138 1139 * Version 3.1 of the [5]OpenMP specification is now supported for the 1140 C, C++, and Fortran compilers. 1141 1142 Ada 1143 1144 * The command-line option -feliminate-unused-debug-types has been 1145 re-enabled by default, as it is for the other languages, leading to 1146 a reduction in debug info size of 12.5% and more for relevant 1147 cases, as well as to a small compilation speedup. 1148 1149 C family 1150 1151 * A new built-in, __builtin_assume_aligned, has been added, through 1152 which the compiler can be hinted about pointer alignment and can 1153 use it to improve generated code. 1154 * A new warning option -Wunused-local-typedefs was added for C, C++, 1155 Objective-C and Objective-C++. This warning diagnoses typedefs 1156 locally defined in a function, and otherwise not used. 1157 * A new experimental command-line option -ftrack-macro-expansion was 1158 added for C, C++, Objective-C, Objective-C++ and Fortran. It allows 1159 the compiler to emit diagnostic about the current macro expansion 1160 stack when a compilation error occurs in a macro expansion. 1161 * Experimental support for transactional memory has been added. It 1162 includes support in the compiler, as well as a supporting runtime 1163 library called libitm. To compile code with transactional memory 1164 constructs, use the -fgnu-tm option. 1165 Support is currently available for Alpha, ARM, PowerPC, SH, SPARC, 1166 and 32-bit/64-bit x86 platforms. 1167 For more details on transactional memory see [6]the GCC WiKi. 1168 * Support for atomic operations specifying the C++11/C11 memory model 1169 has been added. These new __atomic routines replace the existing 1170 __sync built-in routines. 1171 Atomic support is also available for memory blocks. Lock-free 1172 instructions will be used if a memory block is the same size and 1173 alignment as a supported integer type. Atomic operations which do 1174 not have lock-free support are left as function calls. A set of 1175 library functions is available on the GCC atomic wiki in the 1176 "External Atomics Library" section. 1177 For more details on the memory models and features, see the 1178 [7]atomic wiki. 1179 * When a binary operation is performed on vector types and one of the 1180 operands is a uniform vector, it is possible to replace the vector 1181 with the generating element. For example: 1182 typedef int v4si __attribute__ ((vector_size (16))); 1183 v4si res, a = {1,2,3,4}; 1184 int x; 1185 1186 res = 2 + a; /* means {2,2,2,2} + a */ 1187 res = a - x; /* means a - {x,x,x,x} */ 1188 1189 C 1190 1191 * There is support for some more features from the C11 revision of 1192 the ISO C standard. GCC now accepts the options -std=c11 and 1193 -std=gnu11, in addition to the previous -std=c1x and -std=gnu1x. 1194 + Unicode strings (previously supported only with options such 1195 as -std=gnu11, now supported with -std=c11), and the 1196 predefined macros __STDC_UTF_16__ and __STDC_UTF_32__. 1197 + Nonreturning functions (_Noreturn and <stdnoreturn.h>). 1198 + Alignment support (_Alignas, _Alignof, max_align_t, 1199 <stdalign.h>). 1200 + A built-in function __builtin_complex is provided to support C 1201 library implementation of the CMPLX family of macros. 1202 1203 C++ 1204 1205 * G++ now accepts the -std=c++11, -std=gnu++11, and -Wc++11-compat 1206 options, which are equivalent to -std=c++0x, -std=gnu++0x, and 1207 -Wc++0x-compat, respectively. 1208 * G++ now implements [8]C++11 extended friend syntax: 1209 1210 template<class W> 1211 class Q 1212 { 1213 static const int I = 2; 1214 public: 1215 friend W; 1216 }; 1217 1218 struct B 1219 { 1220 int ar[Q<B>::I]; 1221 }; 1222 1223 * Thanks to Ville Voutilainen, G++ now implements [9]C++11 explicit 1224 override control. 1225 1226 struct B { 1227 virtual void f() const final; 1228 virtual void f(int); 1229 }; 1230 1231 struct D : B { 1232 void f() const; // error: D::f attempts to override final B::f 1233 void f(long) override; // error: doesn't override anything 1234 void f(int) override; // ok 1235 }; 1236 1237 struct E final { }; 1238 struct F: E { }; // error: deriving from final class 1239 1240 * G++ now implements [10]C++11 non-static data member initializers. 1241 1242 struct A { 1243 int i = 42; 1244 } a; // initializes a.i to 42 1245 1246 * Thanks to Ed Smith-Rowland, G++ now implements [11]C++11 1247 user-defined literals. 1248 1249 // Not actually a good approximation. :) 1250 constexpr long double operator"" _degrees (long double d) { return d * 0.0175; } 1251 long double pi = 180.0_degrees; 1252 1253 * G++ now implements [12]C++11 alias-declarations. 1254 1255 template <class T> using Ptr = T*; 1256 Ptr<int> ip; // decltype(ip) is int* 1257 1258 * Thanks to Ville Voutilainen and Pedro Lamarao, G++ now implements 1259 [13]C++11 delegating constructors. 1260 1261 struct A { 1262 A(int); 1263 A(): A(42) { } // delegate to the A(int) constructor 1264 }; 1265 1266 * G++ now fully implements C++11 atomic classes rather than just 1267 integer derived classes. 1268 1269 class POD { 1270 int a; 1271 int b; 1272 }; 1273 std::atomic<POD> my_atomic_POD; 1274 1275 * G++ now sets the predefined macro __cplusplus to the correct value, 1276 199711L for C++98/03, and 201103L for C++11. 1277 * G++ now correctly implements the two-phase lookup rules such that 1278 an unqualified name used in a template must have an appropriate 1279 declaration found either in scope at the point of definition of the 1280 template or by argument-dependent lookup at the point of 1281 instantiation. As a result, code that relies on a second 1282 unqualified lookup at the point of instantiation to find functions 1283 declared after the template or in dependent bases will be rejected. 1284 The compiler will suggest ways to fix affected code, and using the 1285 -fpermissive compiler flag will allow the code to compile with a 1286 warning. 1287 1288 template <class T> 1289 void f() { g(T()); } // error, g(int) not found by argument-dependent lookup 1290 void g(int) { } // fix by moving this declaration before the declaration of f 1291 1292 template <class T> 1293 struct A: T { 1294 // error, B::g(B) not found by argument-dependent lookup 1295 void f() { g(T()); } // fix by using this->g or A::g 1296 }; 1297 1298 struct B { void g(B); }; 1299 1300 int main() 1301 { 1302 f<int>(); 1303 A<B>().f(); 1304 } 1305 1306 * G++ now properly re-uses stack space allocated for temporary 1307 objects when their lifetime ends, which can significantly lower 1308 stack consumption for some C++ functions. As a result of this, some 1309 code with undefined behavior will now break: 1310 1311 const int &f(const int &i) { return i; } 1312 .... 1313 const int &x = f(1); 1314 const int &y = f(2); 1315 1316 Here, x refers to the temporary allocated to hold the 1 argument, 1317 which only lives until the end of the initialization; it 1318 immediately becomes a dangling reference. So the next statement 1319 re-uses the stack slot to hold the 2 argument, and users of x get 1320 that value instead. 1321 Note that this should not cause any change of behavior for 1322 temporaries of types with non-trivial destructors, as they are 1323 already destroyed at end of full-expression; the change is that now 1324 the storage is released as well. 1325 * A new command-line option -Wdelete-non-virtual-dtor has been added 1326 to warn when delete is used to destroy an instance of a class which 1327 has virtual functions and non-virtual destructor. It is unsafe to 1328 delete an instance of a derived class through a pointer to a base 1329 class if the base class does not have a virtual destructor. This 1330 warning is enabled by -Wall. 1331 * A new command-line option -Wzero-as-null-pointer-constant has been 1332 added to warn when a literal '0' is used as null pointer constant. 1333 It can be useful to facilitate the conversion to nullptr in C++11. 1334 * As per C++98, access-declarations are now deprecated by G++. 1335 Using-declarations are to be used instead. Furthermore, some 1336 efforts have been made to improve the support of class scope 1337 using-declarations. In particular, using-declarations referring to 1338 a dependent type now work as expected ([14]bug c++/14258). 1339 * The ELF symbol visibility of a template instantiation is now 1340 properly constrained by the visibility of its template arguments 1341 ([15]bug c++/35688). 1342 1343 Runtime Library (libstdc++) 1344 1345 * [16]Improved experimental support for the new ISO C++ standard, 1346 C++11, including: 1347 + using noexcept in most of the library; 1348 + implementations of pointer_traits, allocator_traits and 1349 scoped_allocator_adaptor; 1350 + uses-allocator construction for tuple; 1351 + vector meets the allocator-aware container requirements; 1352 + replacing monotonic_clock with steady_clock; 1353 + enabling the thread support library on most POSIX targets; 1354 + many small improvements to conform to the FDIS. 1355 * Added --enable-clocale=newlib configure option. 1356 * Debug Mode iterators for unordered associative containers. 1357 * Avoid polluting the global namespace and do not include <unistd.h>. 1358 1359 Fortran 1360 1361 * The compile flag [17]-fstack-arrays has been added, which causes 1362 all local arrays to be put on stack memory. For some programs this 1363 will improve the performance significantly. If your program uses 1364 very large local arrays, it is possible that you will have to 1365 extend your runtime limits for stack memory. 1366 * The [18]-Ofast flag now also implies [19]-fno-protect-parens and 1367 [20]-fstack-arrays. 1368 * Front-end optimizations can now be selected by the 1369 [21]-ffrontend-optimize option and deselected by the 1370 -fno-frontend-optimize option. 1371 * When front-end optimization removes a function call, 1372 [22]-Wfunction-elimination warns about that. 1373 * When performing front-end-optimization, the 1374 [23]-faggressive-function-elimination option allows the removal of 1375 duplicate function calls even for impure functions. 1376 * The flag [24]-Wreal-q-constant has been added, which warns if 1377 floating-point literals have been specified using q (such as 1378 1.0q0); the q marker is now supported as a vendor extension to 1379 denote quad precision (REAL(16) or, if not available, REAL(10)). 1380 Consider using a kind parameter (such as in 1.0_qp) instead, which 1381 can be obtained via [25]SELECTED_REAL_KIND. 1382 * The GFORTRAN_USE_STDERR environment variable has been removed. GNU 1383 Fortran now always prints error messages to standard error. If you 1384 wish to redirect standard error, please consult the manual for your 1385 OS, shell, batch environment etc. as appropriate. 1386 * The -fdump-core option and GFORTRAN_ERROR_DUMPCORE environment 1387 variable have been removed. When encountering a serious error, 1388 gfortran will now always abort the program. Whether a core dump is 1389 generated depends on the user environment settings; see the ulimit 1390 -c setting for POSIX shells, limit coredumpsize for C shells, and 1391 the [26]WER user-mode dumps settings on Windows. 1392 * The [27]-fbacktrace option is now enabled by default. When 1393 encountering a fatal error, gfortran will attempt to print a 1394 backtrace to standard error before aborting. It can be disabled 1395 with -fno-backtrace. Note: On POSIX targets with the addr2line 1396 utility from GNU binutils, GNU Fortran can print a backtrace with 1397 function name, file name, line number information in addition to 1398 the addresses; otherwise only the addresses are printed. 1399 * [28]Fortran 2003: 1400 + Generic interface names which have the same name as derived 1401 types are now supported, which allows to write constructor 1402 functions. Note that Fortran does not support static 1403 constructor functions; only default initialization or an 1404 explicit structure-constructor initialization are available. 1405 + [29]Polymorphic (class) arrays are now supported. 1406 * [30]Fortran 2008: 1407 + Support for the DO CONCURRENT construct has been added, which 1408 allows the user to specify that individual loop iterations 1409 have no interdependencies. 1410 + [31]Coarrays: Full single-image support except for polymorphic 1411 coarrays. Additionally, preliminary support for multiple 1412 images via an MPI-based [32]coarray communication library has 1413 been added. Note: The library version is not yet usable as 1414 remote coarray access is not yet possible. 1415 * [33]TS 29113: 1416 + New flag [34]-std=f2008ts permits programs that are expected 1417 to conform to the Fortran 2008 standard and the draft 1418 Technical Specification (TS) 29113 on Further Interoperability 1419 of Fortran with C. 1420 + The OPTIONAL attribute is now allowed for dummy arguments of 1421 BIND(C) procedures. 1422 + The RANK intrinsic has been added. 1423 + The implementation of the ASYNCHRONOUS attribute in GCC is 1424 compatible with the candidate draft of TS 29113 (since GCC 1425 4.6). 1426 1427 Go 1428 1429 * GCC 4.7 implements the [35]Go 1 language standard. The library 1430 support in 4.7.0 is not quite complete, due to release timing. 1431 Release 4.7.1 includes complete support for Go 1. The Go library is 1432 from the Go 1.0.1 release. 1433 * Go has been tested on GNU/Linux and Solaris platforms. It may work 1434 on other platforms as well. 1435 1436 New Targets and Target Specific Improvements 1437 1438 ARM 1439 1440 * GCC now supports the Cortex-A7 processor implementing the v7-a 1441 version of the architecture using the option -mcpu=cortex-a7. 1442 * The default vector size in auto-vectorization for NEON is now 128 1443 bits. If vectorization fails thusly, the vectorizer tries again 1444 with 64-bit vectors. 1445 * A new option -mvectorize-with-neon-double was added to allow users 1446 to change the vector size to 64 bits. 1447 1448 AVR 1449 1450 * GCC now supports the XMEGA architecture. This requires GNU binutils 1451 2.22 or later. 1452 * Support for the [36]named address spaces __flash, __flash1, ..., 1453 __flash5 and __memx has been added. These address spaces locate 1454 read-only data in flash memory and allow reading from flash memory 1455 by means of ordinary C code, i.e. without the need of (inline) 1456 assembler code: 1457 1458 const __flash int values[] = { 42, 31 }; 1459 1460 int add_values (const __flash int *p, int i) 1461 { 1462 return values[i] + *p; 1463 } 1464 1465 * Support has been added for the AVR-specific configure option 1466 --with-avrlibc=yes in order to arrange for better integration of 1467 [37]AVR-Libc. This configure option is supported in avr-gcc 4.7.2 1468 and newer and will only take effect in non-RTEMS configurations. If 1469 avr-gcc is configured for RTEMS, the option will be ignored which 1470 is the same as specifying --with-avrlibc=no. See [38]PR54461 for 1471 more technical details. 1472 * Support for AVR-specific [39]built-in functions has been added. 1473 * Support has been added for the signed and unsigned 24-bit scalar 1474 integer types __int24 and __uint24. 1475 * New command-line options -maccumulate-args, -mbranch-cost=cost and 1476 -mstrict-X were added to allow better fine-tuning of code 1477 optimization. 1478 * The command option -fdata-sections now also takes affect on the 1479 section names of variables with the progmem attribute. 1480 * A new inline assembler print modifier %i to print a RAM address as 1481 I/O address has been added: 1482 1483 #include <avr/io.h> /* Port Definitions from AVR-LibC */ 1484 1485 void set_portb (uint8_t value) 1486 { 1487 asm volatile ("out %i0, %1" :: "n" (&PORTB), "r" (value) : "memory"); 1488 } 1489 1490 The offset between an I/O address and the RAM address for that I/O 1491 location is device-specific. This offset is taken into account when 1492 printing a RAM address with the %i modifier so that the address is 1493 suitable to be used as operand in an I/O command. The address must 1494 be a constant integer known at compile time. 1495 * The inline assembler constraint "R" to represent integers in the 1496 range -6 ... 5 has been removed without replacement. 1497 * Many optimizations to: 1498 + 64-bit integer arithmetic 1499 + Widening multiplication 1500 + Integer division by a constant 1501 + Avoid constant reloading in multi-byte instructions. 1502 + Micro-optimizations for special instruction sequences. 1503 + Generic built-in functions like __builtin_ffs*, 1504 __builtin_clz*, etc. 1505 + If-else decision trees generated by switch instructions 1506 + Merging of data located in flash memory 1507 + New libgcc variants for devices with 8-bit wide stack pointer 1508 + ... 1509 * Better documentation: 1510 + Handling of EIND and indirect jumps on devices with more than 1511 128 KiB of program memory. 1512 + Handling of the RAMPD, RAMPX, RAMPY and RAMPZ special function 1513 registers. 1514 + Function attributes OS_main and OS_task. 1515 + AVR-specific built-in macros. 1516 1517 C6X 1518 1519 * Support has been added for the Texas Instruments C6X family of 1520 processors. 1521 1522 CR16 1523 1524 * Support has been added for National Semiconductor's CR16 1525 architecture. 1526 1527 Epiphany 1528 1529 * Support has been added for Adapteva's Epiphany architecture. 1530 1531 IA-32/x86-64 1532 1533 * Support for Intel AVX2 intrinsics, built-in functions and code 1534 generation is available via -mavx2. 1535 * Support for Intel BMI2 intrinsics, built-in functions and code 1536 generation is available via -mbmi2. 1537 * Implementation and automatic generation of __builtin_clz* using the 1538 lzcnt instruction is available via -mlzcnt. 1539 * Support for Intel FMA3 intrinsics and code generation is available 1540 via -mfma. 1541 * A new -mfsgsbase command-line option is available that makes GCC 1542 generate new segment register read/write instructions through 1543 dedicated built-ins. 1544 * Support for the new Intel rdrnd instruction is available via 1545 -mrdrnd. 1546 * Two additional AVX vector conversion instructions are available via 1547 -mf16c. 1548 * Support for new Intel processor codename IvyBridge with RDRND, 1549 FSGSBASE and F16C is available through -march=core-avx-i. 1550 * Support for the new Intel processor codename Haswell with AVX2, 1551 FMA, BMI, BMI2, LZCNT is available through -march=core-avx2. 1552 * Support for new AMD family 15h processors (Piledriver core) is now 1553 available through -march=bdver2 and -mtune=bdver2 options. 1554 * Support for [40]the x32 psABI is now available through the -mx32 1555 option. 1556 * Windows mingw targets are using the -mms-bitfields option by 1557 default. 1558 * Windows x86 targets are using the __thiscall calling convention for 1559 C++ class-member functions. 1560 * Support for the configure option --with-threads=posix for Windows 1561 mingw targets. 1562 1563 MIPS 1564 1565 * GCC now supports thread-local storage (TLS) for MIPS16. This 1566 requires GNU binutils 2.22 or later. 1567 * GCC can now generate code specifically for the Cavium Octeon+ and 1568 Octeon2 processors. The associated command-line options are 1569 -march=octeon+ and -march=octeon2 respectively. Both options 1570 require GNU binutils 2.22 or later. 1571 * GCC can now work around certain 24k errata, under the control of 1572 the command-line option -mfix-24k. These workarounds require GNU 1573 binutils 2.20 or later. 1574 * 32-bit MIPS GNU/Linux targets such as mips-linux-gnu can now build 1575 n32 and n64 multilibs. The result is effectively a 64-bit GNU/Linux 1576 toolchain that generates 32-bit code by default. Use the 1577 configure-time option --enable-targets=all to select these extra 1578 multilibs. 1579 * Passing -fno-delayed-branch now also stops the assembler from 1580 automatically filling delay slots. 1581 1582 PowerPC/PowerPC64 1583 1584 * Vectors of type vector long long or vector long are passed and 1585 returned using the same method as other vectors with the VSX 1586 instruction set. Previously GCC did not adhere to the ABI for 1587 128-bit vectors with 64-bit integer base types (PR 48857). This 1588 will also be fixed in the GCC 4.6.1 and 4.5.4 releases. 1589 * A new option -mno-pointers-to-nested-functions was added to allow 1590 AIX 32-bit/64-bit and GNU/Linux 64-bit PowerPC users to specify 1591 that the compiler should not load up the chain register (r11) 1592 before calling a function through a pointer. If you use this 1593 option, you cannot call nested functions through a pointer, or call 1594 other languages that might use the static chain. 1595 * A new option msave-toc-indirect was added to allow AIX 1596 32-bit/64-bit and GNU/Linux 64-bit PowerPC users control whether we 1597 save the TOC in the prologue for indirect calls or generate the 1598 save inline. This can speed up some programs that call through a 1599 function pointer a lot, but it can slow down other functions that 1600 only call through a function pointer in exceptional cases. 1601 * The PowerPC port will now enable machine-specific built-in 1602 functions when the user switches the target machine using the 1603 #pragma GCC target or __attribute__ ((__target__ ("target"))) code 1604 sequences. In addition, the target macros are updated. However, due 1605 to the way the -save-temps switch is implemented, you won't see the 1606 effect of these additional macros being defined in preprocessor 1607 output. 1608 1609 SH 1610 1611 * A new option -msoft-atomic has been added. When it is specified, 1612 GCC will generate GNU/Linux-compatible gUSA atomic sequences for 1613 the new __atomic routines. 1614 * Since it is neither supported by GAS nor officially documented, 1615 code generation for little endian SH2A has been disabled. 1616 Specifying -ml with -m2a* will now result in a compiler error. 1617 * The defunct -mbranch-cost option has been fixed. 1618 * Some improvements to the generated code of: 1619 + Utilization of the tst #imm,R0 instruction. 1620 + Dynamic shift instructions on SH2A. 1621 + Integer absolute value calculations. 1622 * The -mdiv= option for targets other than SHmedia has been fixed and 1623 documented. 1624 1625 SPARC 1626 1627 * The option -mflat has been reinstated. When it is specified, the 1628 compiler will generate code for a single register window model. 1629 This is essentially a new implementation and the corresponding 1630 debugger support has been added to GDB 7.4. 1631 * Support for the options -mtune=native and -mcpu=native has been 1632 added on selected native platforms (GNU/Linux and Solaris). 1633 * Support for the SPARC T3 (Niagara 3) processor has been added. 1634 * VIS: 1635 + An intrinsics header visintrin.h has been added. 1636 + Builtin intrinsics for the VIS 1.0 edge handling and pixel 1637 compare instructions have been added. 1638 + The little-endian version of alignaddr is now supported. 1639 + When possible, VIS builtins are marked const, which should 1640 increase the compiler's ability to optimize VIS operations. 1641 + The compiler now properly tracks the %gsr register and how it 1642 behaves as an input for various VIS instructions. 1643 + Akin to fzero, the compiler can now generate fone instructions 1644 in order to set all of the bits of a floating-point register 1645 to 1. 1646 + The documentation for the VIS intrinsics in the GCC manual has 1647 been brought up to date and many inaccuracies were fixed. 1648 + Intrinsics for the VIS 2.0 bmask, bshuffle, and 1649 non-condition-code setting edge instructions have been added. 1650 Their availability is controlled by the new -mvis2 and 1651 -mno-vis2 options. They are enabled by default on 1652 UltraSPARC-III and later CPUs. 1653 * Support for UltraSPARC Fused Multiply-Add floating-point extensions 1654 has been added. These instructions are enabled by default on SPARC 1655 T3 (Niagara 3) and later CPUs. 1656 1657 TILE-Gx/TILEPro 1658 1659 * Support has been added for the Tilera TILE-Gx and TILEPro families 1660 of processors. 1661 1662 Other significant improvements 1663 1664 * A new option (-grecord-gcc-switches) was added that appends 1665 compiler command-line options that might affect code generation to 1666 the DW_AT_producer attribute string in the DWARF debugging 1667 information. 1668 * GCC now supports various new GNU extensions to the DWARF debugging 1669 information format, like [41]entry value and [42]call site 1670 information, [43]typed DWARF stack or [44]a more compact macro 1671 representation. Support for these extensions has been added to GDB 1672 7.4. They can be disabled through the -gstrict-dwarf command-line 1673 option. 1674 1675 GCC 4.7.1 1676 1677 This is the [45]list of problem reports (PRs) from GCC's bug tracking 1678 system that are known to be fixed in the 4.7.1 release. This list might 1679 not be complete (that is, it is possible that some PRs that have been 1680 fixed are not listed here). 1681 1682 The Go frontend in the 4.7.1 release fully supports the [46]Go 1 1683 language standard. 1684 1685 GCC 4.7.2 1686 1687 This is the [47]list of problem reports (PRs) from GCC's bug tracking 1688 system that are known to be fixed in the 4.7.2 release. This list might 1689 not be complete (that is, it is possible that some PRs that have been 1690 fixed are not listed here). 1691 1692 GCC 4.7.3 1693 1694 This is the [48]list of problem reports (PRs) from GCC's bug tracking 1695 system that are known to be fixed in the 4.7.3 release. This list might 1696 not be complete (that is, it is possible that some PRs that have been 1697 fixed are not listed here). 1698 1699 1700 For questions related to the use of GCC, please consult these web 1701 pages and the [49]GCC manuals. If that fails, the 1702 [50]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 1703 web pages and the development of GCC are welcome on our developer 1704 list at [51]gcc (a] gcc.gnu.org. All of [52]our lists have public 1705 archives. 1706 1707 Copyright (C) [53]Free Software Foundation, Inc. Verbatim copying and 1708 distribution of this entire article is permitted in any medium, 1709 provided this notice is preserved. 1710 1711 These pages are [54]maintained by the GCC team. Last modified 1712 2013-04-11[55]. 1713 1714 References 1715 1716 1. http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01263.html 1717 2. http://savannah.nongnu.org/bugs/?35407 1718 3. http://gcc.gnu.org/PR18145 1719 4. http://gcc.gnu.org/gcc-4.7/porting_to.html 1720 5. http://openmp.org/wp/openmp-specifications/ 1721 6. http://gcc.gnu.org/wiki/TransactionalMemory 1722 7. http://gcc.gnu.org/wiki/Atomic/GCCMM 1723 8. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1724 9. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1725 10. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1726 11. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1727 12. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1728 13. http://gcc.gnu.org/gcc-4.7/cxx0x_status.html 1729 14. http://gcc.gnu.org/PR14258 1730 15. http://gcc.gnu.org/PR35688 1731 16. http://gcc.gnu.org/onlinedocs/gcc-4.7.1/libstdc++/manual/manual/status.html#status.iso.2011 1732 17. 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http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Error-and-Warning-Options.html#index-g_t_0040code_007bWreal-q-constant_007d-149 1740 25. http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/SELECTED_005fREAL_005fKIND.html 1741 26. http://msdn.microsoft.com/en-us/library/bb787181%28v=vs.85%29.aspx 1742 27. http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gfortran/Debugging-Options.html#index-g_t_0040code_007bfno-backtrace_007d-183 1743 28. http://gcc.gnu.org/wiki/Fortran2003Status 1744 29. http://gcc.gnu.org/wiki/OOP 1745 30. http://gcc.gnu.org/wiki/Fortran2008Status 1746 31. http://gcc.gnu.org/wiki/Coarray 1747 32. http://gcc.gnu.org/wiki/CoarrayLib 1748 33. http://gcc.gnu.org/wiki/TS29113Status 1749 34. http://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 1750 35. http://weekly.golang.org/doc/go1.html 1751 36. http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Named-Address-Spaces.html 1752 37. http://nongnu.org/avr-libc/ 1753 38. http://gcc.gnu.org/PR54461 1754 39. http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/AVR-Built%5f002din-Functions.html 1755 40. https://sites.google.com/site/x32abi/ 1756 41. http://www.dwarfstd.org/ShowIssue.php?issue=100909.1 1757 42. http://www.dwarfstd.org/ShowIssue.php?issue=100909.2 1758 43. http://www.dwarfstd.org/doc/040408.1.html 1759 44. http://www.dwarfstd.org/ShowIssue.php?issue=110722.1 1760 45. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.1 1761 46. http://weekly.golang.org/doc/go1.html 1762 47. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.2 1763 48. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.7.3 1764 49. http://gcc.gnu.org/onlinedocs/ 1765 50. mailto:gcc-help (a] gcc.gnu.org 1766 51. mailto:gcc (a] gcc.gnu.org 1767 52. http://gcc.gnu.org/lists.html 1768 53. http://www.fsf.org/ 1769 54. http://gcc.gnu.org/about.html 1770 55. http://validator.w3.org/check/referer 1771 ====================================================================== 1772 http://gcc.gnu.org/gcc-4.6/index.html 1773 1774 GCC 4.6 Release Series 1775 1776 April 12, 2013 1777 1778 The [1]GNU project and the GCC developers are pleased to announce the 1779 release of GCC 4.6.4. 1780 1781 This release is a bug-fix release, containing fixes for regressions in 1782 GCC 4.6.3 relative to previous releases of GCC. 1783 1784 Release History 1785 1786 GCC 4.6.4 1787 April 12, 2013 ([2]changes, [3]documentation) 1788 1789 GCC 4.6.3 1790 March 1, 2012 ([4]changes, [5]documentation) 1791 1792 GCC 4.6.2 1793 October 26, 2011 ([6]changes, [7]documentation) 1794 1795 GCC 4.6.1 1796 June 27, 2011 ([8]changes, [9]documentation) 1797 1798 GCC 4.6.0 1799 March 25, 2011 ([10]changes, [11]documentation) 1800 1801 References and Acknowledgements 1802 1803 GCC used to stand for the GNU C Compiler, but since the compiler 1804 supports several other languages aside from C, it now stands for the 1805 GNU Compiler Collection. 1806 1807 A list of [12]successful builds is updated as new information becomes 1808 available. 1809 1810 The GCC developers would like to thank the numerous people that have 1811 contributed new features, improvements, bug fixes, and other changes as 1812 well as test results to GCC. This [13]amazing group of volunteers is 1813 what makes GCC successful. 1814 1815 For additional information about GCC please refer to the [14]GCC 1816 project web site or contact the [15]GCC development mailing list. 1817 1818 To obtain GCC please use [16]our mirror sites or [17]our SVN server. 1819 1820 1821 For questions related to the use of GCC, please consult these web 1822 pages and the [18]GCC manuals. If that fails, the 1823 [19]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 1824 web pages and the development of GCC are welcome on our developer 1825 list at [20]gcc (a] gcc.gnu.org. All of [21]our lists have public 1826 archives. 1827 1828 Copyright (C) [22]Free Software Foundation, Inc. Verbatim copying and 1829 distribution of this entire article is permitted in any medium, 1830 provided this notice is preserved. 1831 1832 These pages are [23]maintained by the GCC team. Last modified 1833 2013-04-12[24]. 1834 1835 References 1836 1837 1. http://www.gnu.org/ 1838 2. http://gcc.gnu.org/gcc-4.6/changes.html 1839 3. http://gcc.gnu.org/onlinedocs/4.6.4/ 1840 4. http://gcc.gnu.org/gcc-4.6/changes.html 1841 5. http://gcc.gnu.org/onlinedocs/4.6.3/ 1842 6. http://gcc.gnu.org/gcc-4.6/changes.html 1843 7. http://gcc.gnu.org/onlinedocs/4.6.2/ 1844 8. http://gcc.gnu.org/gcc-4.6/changes.html 1845 9. http://gcc.gnu.org/onlinedocs/4.6.1/ 1846 10. http://gcc.gnu.org/gcc-4.6/changes.html 1847 11. http://gcc.gnu.org/onlinedocs/4.6.0/ 1848 12. http://gcc.gnu.org/gcc-4.6/buildstat.html 1849 13. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 1850 14. http://gcc.gnu.org/index.html 1851 15. mailto:gcc (a] gcc.gnu.org 1852 16. http://gcc.gnu.org/mirrors.html 1853 17. http://gcc.gnu.org/svn.html 1854 18. http://gcc.gnu.org/onlinedocs/ 1855 19. mailto:gcc-help (a] gcc.gnu.org 1856 20. mailto:gcc (a] gcc.gnu.org 1857 21. http://gcc.gnu.org/lists.html 1858 22. http://www.fsf.org/ 1859 23. http://gcc.gnu.org/about.html 1860 24. http://validator.w3.org/check/referer 1861 ====================================================================== 1862 http://gcc.gnu.org/gcc-4.6/changes.html 1863 1864 GCC 4.6 Release Series 1865 Changes, New Features, and Fixes 1866 1867 Caveats 1868 1869 * The options -b <machine> and -V <version> have been removed because 1870 they were unreliable. Instead, users should directly run 1871 <machine>-gcc when cross-compiling, or <machine>-gcc-<version> to 1872 run a different version of gcc. 1873 * GCC now has stricter checks for invalid command-line options. In 1874 particular, when gcc was called to link object files rather than 1875 compile source code, it would previously accept and ignore all 1876 options starting with --, including linker options such as 1877 --as-needed and --export-dynamic, although such options would 1878 result in errors if any source code was compiled. Such options, if 1879 unknown to the compiler, are now rejected in all cases; if the 1880 intent was to pass them to the linker, options such as 1881 -Wl,--as-needed should be used. 1882 * Versions of the GNU C library up to and including 2.11.1 included 1883 an [1]incorrect implementation of the cproj function. GCC optimizes 1884 its builtin cproj according to the behavior specified and allowed 1885 by the ISO C99 standard. If you want to avoid discrepancies between 1886 the C library and GCC's builtin transformations when using cproj in 1887 your code, use GLIBC 2.12 or later. If you are using an older GLIBC 1888 and actually rely on the incorrect behavior of cproj, then you can 1889 disable GCC's transformations using -fno-builtin-cproj. 1890 * The C-only intermodule optimization framework (IMA, enabled by 1891 -combine) has been removed in favor of the new generic link-time 1892 optimization framework (LTO) introduced in [2]GCC 4.5.0. 1893 * GCC now ships with the LGPL-licensed libquadmath library, which 1894 provides quad-precision mathematical functions for targets with a 1895 __float128 datatype. __float128 is available for targets on 32-bit 1896 x86, x86-64 and Itanium architectures. The libquadmath library is 1897 automatically built on such targets when building the Fortran 1898 compiler. 1899 * New -Wunused-but-set-variable and -Wunused-but-set-parameter 1900 warnings were added for C, C++, Objective-C and Objective-C++. 1901 These warnings diagnose variables respective parameters which are 1902 only set in the code and never otherwise used. Usually such 1903 variables are useless and often even the value assigned to them is 1904 computed needlessly, sometimes expensively. The 1905 -Wunused-but-set-variable warning is enabled by default by -Wall 1906 flag and -Wunused-but-set-parameter by -Wall -Wextra flags. 1907 * On ARM, a bug has been fixed in GCC's implementation of the AAPCS 1908 rules for the layout of vectors that could lead to wrong code being 1909 generated. Vectors larger than 8 bytes in size are now by default 1910 aligned to an 8-byte boundary. This is an ABI change: code that 1911 makes explicit use of vector types may be incompatible with binary 1912 objects built with older versions of GCC. Auto-vectorized code is 1913 not affected by this change. (This change affects GCC versions 1914 4.6.4 and later, with the exception of versions 4.7.0 and 4.7.1.) 1915 * On AVR, variables with the progmem attribute to locate data in 1916 flash memory must be qualified as const. 1917 * Support for a number of older systems and recently unmaintained or 1918 untested target ports of GCC has been declared obsolete in GCC 4.6. 1919 Unless there is activity to revive them, the next release of GCC 1920 will have their sources permanently removed. 1921 All GCC ports for the following processor architectures have been 1922 declared obsolete: 1923 + Argonaut ARC (arc-*) 1924 + National Semiconductor CRX (crx-*) 1925 + Motorola 68HC11 and 68HC12 (m68hc11-*-*, m6811-*-*, 1926 m68hc12-*-*, m6812-*-*) 1927 + Sunplus S+core (score-*) 1928 The following ports for individual systems on particular 1929 architectures have been obsoleted: 1930 + Interix (i[34567]86-*-interix3*) 1931 + NetWare x86 (i[3456x]86-*-netware*) 1932 + Generic ARM PE (arm-*-pe* other than arm*-wince-pe*) 1933 + MCore PE (mcore-*-pe*) 1934 + SH SymbianOS (sh*-*-symbianelf*) 1935 + GNU Hurd on Alpha and PowerPC (alpha*-*-gnu*, powerpc*-*-gnu*) 1936 + M68K uClinux old ABI (m68k-*-uclinuxoldabi*) 1937 + a.out NetBSD (arm*-*-netbsd*, i[34567]86-*-netbsd*, 1938 vax-*-netbsd*, but not *-*-netbsdelf*) 1939 The i[34567]86-*-pe alias for Cygwin targets has also been 1940 obsoleted; users should configure for i[34567]86-*-cygwin* instead. 1941 Certain configure options to control the set of libraries built 1942 with GCC on some targets have been obsoleted. On ARM targets, the 1943 options --disable-fpu, --disable-26bit, --disable-underscore, 1944 --disable-interwork, --disable-biendian and --disable-nofmult have 1945 been obsoleted. On MIPS targets, the options 1946 --disable-single-float, --disable-biendian and --disable-softfloat 1947 have been obsoleted. 1948 * Support has been removed for all the [3]configurations obsoleted in 1949 GCC 4.5. 1950 * More information on porting to GCC 4.6 from previous versions of 1951 GCC can be found in the [4]porting guide for this release. 1952 1953 General Optimizer Improvements 1954 1955 * A new general optimization level, -Ofast, has been introduced. It 1956 combines the existing optimization level -O3 with options that can 1957 affect standards compliance but result in better optimized code. 1958 For example, -Ofast enables -ffast-math. 1959 * Link-time optimization improvements: 1960 + The [5]Scalable Whole Program Optimizer (WHOPR) project has 1961 stabilized to the point of being usable. It has become the 1962 default mode when using the LTO optimization model. Link time 1963 optimization can now split itself into multiple parallel 1964 compilations. Parallelism is controlled with -flto=n (where n 1965 specifies the number of compilations to execute in parallel). 1966 GCC can also cooperate with a GNU make job server by 1967 specifying the -flto=jobserver option and adding + to the 1968 beginning of the Makefile rule executing the linker. 1969 Classical LTO mode can be enforced by -flto-partition=none. 1970 This may result in small code quality improvements. 1971 + A large number of bugs were fixed. GCC itself, Mozilla Firefox 1972 and other large applications can be built with LTO enabled. 1973 + The linker plugin support improvements 1974 o Linker plugin is now enabled by default when the linker 1975 is detected to have plugin support. This is the case for 1976 GNU ld 2.21.51 or newer (on ELF and Cygwin targets) and 1977 the Gold linker on ELF targets. Plugin support of the 1978 Apple linker on Darwin is not compatible with GCC. The 1979 linker plugin can also be controlled by the 1980 -fuse-linker-plugin command line option. 1981 o Resolution information from the linker plugin is used to 1982 drive whole program assumptions. Use of the linker plugin 1983 results in more aggressive optimization on binaries and 1984 on shared libraries that use the hidden visibility 1985 attribute. Consequently the use of -fwhole-program is not 1986 necessary in addition to LTO. 1987 + Hidden symbols used from non-LTO objects now have to be 1988 explicitly annotated with externally_visible when the linker 1989 plugin is not used. 1990 + C++ inline functions and virtual tables are now privatized 1991 more aggressively, leading to better inter-procedural 1992 optimization and faster dynamic linking. 1993 + Memory usage and intermediate language streaming performance 1994 have been improved. 1995 + Static constructors and destructors from individual units are 1996 inlined into a single function. This can significantly improve 1997 startup times of large C++ applications where static 1998 constructors are very common. For example, static constructors 1999 are used when including the iostream header. 2000 + Support for the Ada language has been added. 2001 * Interprocedural optimization improvements 2002 + The interprocedural framework was re-tuned for link time 2003 optimization. Several scalability issues were resolved. 2004 + Improved auto-detection of const and pure functions. Newly, 2005 noreturn functions are auto-detected. 2006 The [6]-Wsuggest-attribute=[const|pure|noreturn] flag is 2007 available that informs users when adding attributes to headers 2008 might improve code generation. 2009 + A number of inlining heuristic improvements. In particular: 2010 o Partial inlining is now supported and enabled by default 2011 at -O2 and greater. The feature can be controlled via 2012 -fpartial-inlining. 2013 Partial inlining splits functions with short hot path to 2014 return. This allows more aggressive inlining of the hot 2015 path leading to better performance and often to code size 2016 reductions (because cold parts of functions are not 2017 duplicated). 2018 o Scalability for large compilation units was improved 2019 significantly. 2020 o Inlining of callbacks is now more aggressive. 2021 o Virtual methods are considered for inlining when the 2022 caller is inlined and devirtualization is then possible. 2023 o Inlining when optimizing for size (either in cold regions 2024 of a program or when compiling with -Os) was improved to 2025 better handle C++ programs with larger abstraction 2026 penalty, leading to smaller and faster code. 2027 + The IPA reference optimization pass detecting global variables 2028 used or modified by functions was strengthened and sped up. 2029 + Functions whose address was taken are now optimized out when 2030 all references to them are dead. 2031 + A new inter-procedural static profile estimation pass detects 2032 functions that are executed once or unlikely to be executed. 2033 Unlikely executed functions are optimized for size. Functions 2034 executed once are optimized for size except for the inner 2035 loops. 2036 + On most targets with named section support, functions used 2037 only at startup (static constructors and main), functions used 2038 only at exit and functions detected to be cold are placed into 2039 separate text segment subsections. This extends the 2040 -freorder-functions feature and is controlled by the same 2041 switch. The goal is to improve the startup time of large C++ 2042 programs. 2043 Proper function placement requires linker support. GNU ld 2044 2.21.51 on ELF targets was updated to place those functions 2045 together within the text section leading to better code 2046 locality and faster startup times of large C++ programs. The 2047 feature is also supported in the Apple linker. Support in the 2048 gold linker is planned. 2049 * A new switch -fstack-usage has been added. It makes the compiler 2050 output stack usage information for the program, on a per-function 2051 basis, in an auxiliary file. 2052 * A new switch -fcombine-stack-adjustments has been added. It can be 2053 used to enable or disable the compiler's stack-slot combining pass 2054 which before was enabled automatically at -O1 and above, but could 2055 not be controlled on its own. 2056 * A new switch -fstrict-volatile-bitfields has been added. Using it 2057 indicates that accesses to volatile bitfields should use a single 2058 access of the width of the field's type. This option can be useful 2059 for precisely defining and accessing memory-mapped peripheral 2060 registers from C or C++. 2061 2062 Compile time and memory usage improvements 2063 2064 * Datastructures used by the dataflow framework in GCC were 2065 reorganized for better memory usage and more cache locality. 2066 Compile time is improved especially on units with large functions 2067 (possibly resulting from a lot of inlining) not fitting into the 2068 processor cache. The compile time of the GCC C compiler binary with 2069 link-time optimization went down by over 10% (benchmarked on x86-64 2070 target). 2071 2072 New Languages and Language specific improvements 2073 2074 Ada 2075 2076 * Stack checking has been improved on selected architectures (Alpha, 2077 IA-32/x86-64, RS/6000 and SPARC): it now will detect stack 2078 overflows in all cases on these architectures. 2079 * Initial support for Ada 2012 has been added. 2080 2081 C family 2082 2083 * A new warning, enabled by -Wdouble-promotion, has been added that 2084 warns about cases where a value of type float is implicitly 2085 promoted to double. This is especially helpful for CPUs that handle 2086 the former in hardware, but emulate the latter in software. 2087 * A new function attribute leaf was introduced. This attribute allows 2088 better inter-procedural optimization across calls to functions that 2089 return to the current unit only via returning or exception 2090 handling. This is the case for most library functions that have no 2091 callbacks. 2092 * Support for a new data type __int128 for targets having wide enough 2093 machine-mode support. 2094 * The new function attribute callee_pop_aggregate allows to specify 2095 if the caller or callee is responsible for popping the aggregate 2096 return pointer value from the stack. 2097 * Support for selectively enabling and disabling warnings via #pragma 2098 GCC diagnostic has been added. For instance: 2099 #pragma GCC diagnostic error "-Wuninitialized" 2100 foo(a); /* error is given for this one */ 2101 #pragma GCC diagnostic push 2102 #pragma GCC diagnostic ignored "-Wuninitialized" 2103 foo(b); /* no diagnostic for this one */ 2104 #pragma GCC diagnostic pop 2105 foo(c); /* error is given for this one */ 2106 #pragma GCC diagnostic pop 2107 foo(d); /* depends on command line options */ 2108 2109 * The -fmax-errors=N option is now supported. Using this option 2110 causes the compiler to exit after N errors have been issued. 2111 2112 C 2113 2114 * There is now experimental support for some features from the 2115 upcoming C1X revision of the ISO C standard. This support may be 2116 selected with -std=c1x, or -std=gnu1x for C1X with GNU extensions. 2117 Note that this support is experimental and may change incompatibly 2118 in future releases for consistency with changes to the C1X standard 2119 draft. The following features are newly supported as described in 2120 the N1539 draft of C1X (with changes agreed at the March 2011 WG14 2121 meeting); some other features were already supported with no 2122 compiler changes being needed, or have some support but not in full 2123 accord with N1539 (as amended). 2124 + Static assertions (_Static_assert keyword) 2125 + Typedef redefinition 2126 + New macros in <float.h> 2127 + Anonymous structures and unions 2128 * The new -fplan9-extensions option directs the compiler to support 2129 some extensions for anonymous struct fields which are implemented 2130 by the Plan 9 compiler. A pointer to a struct may be automatically 2131 converted to a pointer to an anonymous field when calling a 2132 function, in order to make the types match. An anonymous struct 2133 field whose type is a typedef name may be referred to using the 2134 typedef name. 2135 2136 C++ 2137 2138 * Improved [7]experimental support for the upcoming C++0x ISO C++ 2139 standard, including support for constexpr (thanks to Gabriel Dos 2140 Reis and Jason Merrill), nullptr (thanks to Magnus Fromreide), 2141 noexcept, unrestricted unions, range-based for loops (thanks to 2142 Rodrigo Rivas Costa), opaque enum declarations (thanks also to 2143 Rodrigo), implicitly deleted functions and implicit move 2144 constructors. 2145 * When an extern declaration within a function does not match a 2146 declaration in the enclosing context, G++ now properly declares the 2147 name within the namespace of the function rather than the namespace 2148 which was open just before the function definition ([8]c++/43145). 2149 * GCC now warns by default when casting integers to larger pointer 2150 types. These warnings can be disabled with the option 2151 -Wno-int-to-pointer-cast, which is now also available in C++. 2152 * G++ no longer optimizes using the assumption that a value of 2153 enumeration type will fall within the range specified by the 2154 standard, since that assumption is easily violated with a 2155 conversion from integer type ([9]c++/43680). The old behavior can 2156 be restored with -fstrict-enums. 2157 * The new -fnothrow-opt flag changes the semantics of a throw() 2158 exception specification to match the proposed semantics of the 2159 noexcept specification: just call terminate if an exception tries 2160 to propagate out of a function with such an exception 2161 specification. This dramatically reduces or eliminates the code 2162 size overhead from adding the exception specification. 2163 * The new -Wnoexcept flag will suggest adding a noexcept qualifier to 2164 a function that the compiler can tell doesn't throw if it would 2165 change the value of a noexcept expression. 2166 * The -Wshadow option now warns if a local variable or type 2167 declaration shadows another type in C++. Note that the compiler 2168 will not warn if a local variable shadows a struct/class/enum, but 2169 will warn if it shadows an explicit typedef. 2170 * When an identifier is not found in the current scope, G++ now 2171 offers suggestions about which identifier might have been intended. 2172 * G++ now issues clearer diagnostics for missing semicolons after 2173 class, struct, and union definitions. 2174 * G++ now issues clearer diagnostics for missing semicolons after 2175 class member declarations. 2176 * G++ now issues clearer diagnostics when a colon is used in a place 2177 where a double-colon was intended. 2178 * G++ no longer accepts mutable on reference members ([10]c++/33558). 2179 Use -fpermissive to allow the old, non-conforming behaviour. 2180 * A few mangling fixes have been made, to attribute const/volatile on 2181 function pointer types, decltype of a plain decl, and use of a 2182 function parameter in the declaration of another parameter. By 2183 default the compiler still uses the old mangling, but emits aliases 2184 with the new mangling on targets that support strong aliases. Users 2185 can switch over entirely to the new mangling with -fabi-version=5 2186 or -fabi-version=0. -Wabi will now warn about code that uses the 2187 old mangling. 2188 * In 4.6.0 and 4.6.1 G++ no longer allows objects of const-qualified 2189 type to be default initialized unless the type has a user-declared 2190 default constructor. In 4.6.2 G++ implements the proposed 2191 resolution of [11]DR 253, so default initialization is allowed if 2192 it initializes all subobjects. Code that fails to compile can be 2193 fixed by providing an initializer e.g. 2194 struct A { A(); }; 2195 struct B : A { int i; }; 2196 const B b = B(); 2197 Use -fpermissive to allow the old, non-conforming behaviour. 2198 2199 Runtime Library (libstdc++) 2200 2201 * [12]Improved experimental support for the upcoming ISO C++ 2202 standard, C++0x, including using constexpr and nullptr. 2203 * Performance improvements to the [13]Debug Mode, thanks to Franc,ois 2204 Dumont. 2205 * Atomic operations used for reference-counting are annotated so that 2206 they can be understood by race detectors such as Helgrind, see 2207 [14]Data Race Hunting. 2208 * Most libstdc++ standard headers have been changed to no longer 2209 include the cstddef header as an implementation detail. Code that 2210 relied on that header being included as side-effect of including 2211 other standard headers will need to include cstddef explicitly. 2212 2213 Fortran 2214 2215 * On systems supporting the libquadmath library, GNU Fortran now also 2216 supports a quad-precision, kind=16 floating-point data type 2217 (REAL(16), COMPLEX(16)). As the data type is not fully supported in 2218 hardware, calculations might be one to two orders of magnitude 2219 slower than with the 4, 8 or 10 bytes floating-point data types. 2220 This change does not affect systems which support REAL(16) in 2221 hardware nor those which do not support libquadmath. 2222 * Much improved compile time for large array constructors. 2223 * In order to reduce execution time and memory consumption, use of 2224 temporary arrays in assignment expressions is avoided for many 2225 cases. The compiler now reverses loops in order to avoid generating 2226 a temporary array where possible. 2227 * Improved diagnostics, especially with -fwhole-file. 2228 * The -fwhole-file flag is now enabled by default. This improves code 2229 generation and diagnostics. It can be disabled using the deprecated 2230 -fno-whole-file flag. 2231 * Support the generation of Makefile dependencies via the [15]-M... 2232 flags of GCC; you may need to specify the -cpp option in addition. 2233 The dependencies take modules, Fortran's include, and CPP's 2234 #include into account. Note: Using -M for the module path is no 2235 longer supported, use -J instead. 2236 * The flag -Wconversion has been modified to only issue warnings 2237 where a conversion leads to information loss. This drastically 2238 reduces the number of warnings; -Wconversion is thus now enabled 2239 with -Wall. The flag -Wconversion-extra has been added and also 2240 warns about other conversions; -Wconversion-extra typically issues 2241 a huge number of warnings, most of which can be ignored. 2242 * A new command-line option -Wunused-dummy-argument warns about 2243 unused dummy arguments and is included in -Wall. Before, 2244 -Wunused-variable also warned about unused dummy arguments. 2245 * Fortran 2003 support has been extended: 2246 + Improved support for polymorphism between libraries and 2247 programs and for complicated inheritance patterns (cf. 2248 [16]object-oriented programming). 2249 + Experimental support of the ASSOCIATE construct. 2250 + In pointer assignments it is now possible to specify the lower 2251 bounds of the pointer and, for a rank-1 or a simply contiguous 2252 data-target, to remap the bounds. 2253 + Automatic (re)allocation: In intrinsic assignments to 2254 allocatable variables the left-hand side will be automatically 2255 allocated (if unallocated) or reallocated (if the shape or 2256 type parameter is different). To avoid the small performance 2257 penalty, you can use a(:) = ... instead of a = ... for arrays 2258 and character strings - or disable the feature using -std=f95 2259 or -fno-realloc-lhs. 2260 + Deferred type parameter: For scalar allocatable and pointer 2261 variables the character length can be deferred. 2262 + Namelist variables with allocatable and pointer attribute and 2263 nonconstant length type parameter are supported. 2264 * Fortran 2008 support has been extended: 2265 + Experimental [17]coarray support (for one image only, i.e. 2266 num_images() == 1); use the [18]-fcoarray=single flag to 2267 enable it. 2268 + The STOP and the new ERROR STOP statements now support all 2269 constant expressions. 2270 + Support for the CONTIGUOUS attribute. 2271 + Support for ALLOCATE with MOLD. 2272 + Support for the STORAGE_SIZE intrinsic inquiry function. 2273 + Support of the NORM2 and PARITY intrinsic functions. 2274 + The following bit intrinsics were added: POPCNT and POPPAR for 2275 counting the number of 1 bits and returning the parity; BGE, 2276 BGT, BLE, and BLT for bitwise comparisons; DSHIFTL and DSHIFTR 2277 for combined left and right shifts, MASKL and MASKR for simple 2278 left and right justified masks, MERGE_BITS for a bitwise merge 2279 using a mask, SHIFTA, SHIFTL and SHIFTR for shift operations, 2280 and the transformational bit intrinsics IALL, IANY and 2281 IPARITY. 2282 + Support of the EXECUTE_COMMAND_LINE intrinsic subroutine. 2283 + Support for the IMPURE attribute for procedures, which allows 2284 for ELEMENTAL procedures without the restrictions of PURE. 2285 + Null pointers (including NULL()) and not allocated variables 2286 can be used as actual argument to optional non-pointer, 2287 non-allocatable dummy arguments, denoting an absent argument. 2288 + Non-pointer variables with TARGET attribute can be used as 2289 actual argument to POINTER dummies with INTENT(IN) 2290 + Pointers including procedure pointers and those in a derived 2291 type (pointer components) can now be initialized by a target 2292 instead of only by NULL. 2293 + The EXIT statement (with construct-name) can now be used to 2294 leave not only the DO but also the ASSOCIATE, BLOCK, IF, 2295 SELECT CASE and SELECT TYPE constructs. 2296 + Internal procedures can now be used as actual argument. 2297 + The named constants INTEGER_KINDS, LOGICAL_KINDS, REAL_KINDS 2298 and CHARACTER_KINDS of the intrinsic module ISO_FORTRAN_ENV 2299 have been added; these arrays contain the supported kind 2300 values for the respective types. 2301 + The module procedures C_SIZEOF of the intrinsic module 2302 ISO_C_BINDINGS and COMPILER_VERSION and COMPILER_OPTIONS of 2303 ISO_FORTRAN_ENV have been implemented. 2304 + Minor changes: obsolescence diagnostics for ENTRY was added 2305 for -std=f2008; a line may start with a semicolon; for 2306 internal and module procedures END can be used instead of END 2307 SUBROUTINE and END FUNCTION; SELECTED_REAL_KIND now also takes 2308 a RADIX argument; intrinsic types are supported for 2309 TYPE(intrinsic-type-spec); multiple type-bound procedures can 2310 be declared in a single PROCEDURE statement; implied-shape 2311 arrays are supported for named constants (PARAMETER). The 2312 transformational, three argument versions of BESSEL_JN and 2313 BESSEL_YN were added - the elemental, two-argument version had 2314 been added in GCC 4.4; note that the transformational 2315 functions use a recurrence algorithm. 2316 2317 Go 2318 2319 Support for the [19]Go programming language has been added to GCC. It 2320 is not enabled by default when you build GCC; use the 2321 --enable-languages configure option to build it. The driver program for 2322 compiling Go code is gccgo. 2323 2324 Go is currently known to work on GNU/Linux and RTEMS. Solaris support 2325 is in progress. It may or may not work on other platforms. 2326 2327 Objective-C and Objective-C++ 2328 2329 * The -fobjc-exceptions flag is now required to enable Objective-C 2330 exception and synchronization syntax (introduced by the keywords 2331 @try, @catch, @finally and @synchronized). 2332 * A number of Objective-C 2.0 features and extensions are now 2333 supported by GCC. These features are enabled by default; you can 2334 disable them by using the new -fobjc-std=objc1 command-line option. 2335 * The Objective-C 2.0 dot-syntax is now supported. It is an 2336 alternative syntax for using getters and setters; object.count is 2337 automatically converted into [object count] or [object setCount: 2338 ...] depending on context; for example if (object.count > 0) is 2339 automatically compiled into the equivalent of if ([object count] > 2340 0) while object.count = 0; is automatically compiled into the 2341 equivalent ot [object setCount: 0];. The dot-syntax can be used 2342 with instance and class objects and with any setters or getters, no 2343 matter if they are part of a declared property or not. 2344 * Objective-C 2.0 declared properties are now supported. They are 2345 declared using the new @property keyword, and are most commonly 2346 used in conjunction with the new Objective-C 2.0 dot-syntax. The 2347 nonatomic, readonly, readwrite, assign, retain, copy, setter and 2348 getter attributes are all supported. Marking declared properties 2349 with __attribute__ ((deprecated)) is supported too. 2350 * The Objective-C 2.0 @synthesize and @dynamic keywords are 2351 supported. @synthesize causes the compiler to automatically 2352 synthesize a declared property, while @dynamic is used to disable 2353 all warnings for a declared property for which no implementation is 2354 provided at compile time. Synthesizing declared properties requires 2355 runtime support in most useful cases; to be able to use it with the 2356 GNU runtime, appropriate helper functions have been added to the 2357 GNU Objective-C runtime ABI, and are implemented by the GNU 2358 Objective-C runtime library shipped with GCC. 2359 * The Objective-C 2.0 fast enumeration syntax is supported in 2360 Objective-C. This is currently not yet available in Objective-C++. 2361 Fast enumeration requires support in the runtime, and such support 2362 has been added to the GNU Objective-C runtime library (shipped with 2363 GCC). 2364 * The Objective-C 2.0 @optional keyword is supported. It allows you 2365 to mark methods or properties in a protocol as optional as opposed 2366 to required. 2367 * The Objective-C 2.0 @package keyword is supported. It has currently 2368 the same effect as the @public keyword. 2369 * Objective-C 2.0 method attributes are supported. Currently the 2370 supported attributes are deprecated, sentinel, noreturn and format. 2371 * Objective-C 2.0 method argument attributes are supported. The most 2372 widely used attribute is unused, to mark an argument as unused in 2373 the implementation. 2374 * Objective-C 2.0 class and protocol attributes are supported. 2375 Currently the only supported attribute is deprecated. 2376 * Objective-C 2.0 class extensions are supported. A class extension 2377 has the same syntax as a category declaration with no category 2378 name, and the methods and properties declared in it are added 2379 directly to the main class. It is mostly used as an alternative to 2380 a category to add methods to a class without advertising them in 2381 the public headers, with the advantage that for class extensions 2382 the compiler checks that all the privately declared methods are 2383 actually implemented. 2384 * As a result of these enhancements, GCC can now be used to build 2385 Objective-C and Objective-C++ software that uses Foundation and 2386 other important system frameworks with the NeXT runtime on Darwin 9 2387 and Darwin 10 (OSX 10.5 and 10.6). 2388 * Many bugs in the compiler have been fixed in this release; in 2389 particular, LTO can now be used when compiling Objective-C and 2390 Objective-C++ and the parser is much more robust in dealing with 2391 invalid code. 2392 2393 Runtime Library (libobjc) 2394 2395 * The GNU Objective-C runtime library now defines the macro 2396 __GNU_LIBOBJC__ (with a value that is increased at every release 2397 where there is any change to the API) in objc/objc.h, making it 2398 easy to determine if the GNU Objective-C runtime library is being 2399 used, and if so, which version. Previous versions of the GNU 2400 Objective-C runtime library (and other Objective-C runtime 2401 libraries such as the Apple one) do not define this macro. 2402 * A new Objective-C 2.0 API, almost identical to the one implemented 2403 by the Apple Objective-C runtime, has been implemented in the GNU 2404 Objective-C runtime library. The new API hides the internals of 2405 most runtime structures but provides a more extensive set of 2406 functions to operate on them. It is much easier, for example, to 2407 create or modify classes at runtime. The new API also makes it 2408 easier to port software from Apple to GNU as almost no changes 2409 should be required. The old API is still supported for backwards 2410 compatibility; including the old objc/objc-api.h header file 2411 automatically selects the old API, while including the new 2412 objc/runtime.h header file automatically selects the new API. 2413 Support for the old API is being phased out and upgrading the 2414 software to use the new API is strongly recommended. To check for 2415 the availability of the new API, the __GNU_LIBOBJC__ macro can be 2416 used as older versions of the GNU Objective-C runtime library, 2417 which do not support the new API, do not define such a macro. 2418 * Runtime support for @synchronized has been added. 2419 * Runtime support for Objective-C 2.0 synthesized property accessors 2420 has been added. 2421 * Runtime support for Objective-C 2.0 fast enumeration has been 2422 added. 2423 2424 New Targets and Target Specific Improvements 2425 2426 ARM 2427 2428 * GCC now supports the Cortex-M4 processor implementing the v7-em 2429 version of the architecture using the option -mcpu=cortex-m4. 2430 * Scheduling descriptions for the Cortex-M4, the Neon and the 2431 floating point units of the Cortex-A9 and a pipeline description 2432 for the Cortex-A5 have been added. 2433 * Synchronization primitives such as __sync_fetch_and_add and friends 2434 are now inlined for supported architectures rather than calling 2435 into a kernel helper function. 2436 * SSA loop prefetching is enabled by default for the Cortex-A9 at 2437 -O3. 2438 * Several improvements were committed to improve code generation for 2439 the ARM architecture including a rewritten implementation for load 2440 and store multiples. 2441 * Several enhancements were committed to improve SIMD code generation 2442 for NEON by adding support for widening instructions, misaligned 2443 loads and stores, vector conditionals and support for 64 bit 2444 arithmetic. 2445 * Support was added for the Faraday cores fa526, fa606te, fa626te, 2446 fmp626te, fmp626 and fa726te and can be used with the respective 2447 names as parameters to the -mcpu= option. 2448 * Basic support was added for Cortex-A15 and is available through 2449 -mcpu=cortex-a15. 2450 * GCC for AAPCS configurations now more closely adheres to the AAPCS 2451 specification by enabling -fstrict-volatile-bitfields by default. 2452 2453 IA-32/x86-64 2454 2455 * The new -fsplit-stack option permits programs to use a 2456 discontiguous stack. This is useful for threaded programs, in that 2457 it is no longer necessary to specify the maximum stack size when 2458 creating a thread. This feature is currently only implemented for 2459 32-bit and 64-bit x86 GNU/Linux targets. 2460 * Support for emitting profiler counter calls before function 2461 prologues. This is enabled via a new command-line option -mfentry. 2462 * Optimization for the Intel Core 2 processors is now available 2463 through the -march=core2 and -mtune=core2 options. 2464 * Support for Intel Core i3/i5/i7 processors is now available through 2465 the -march=corei7 and -mtune=corei7 options. 2466 * Support for Intel Core i3/i5/i7 processors with AVX is now 2467 available through the -march=corei7-avx and -mtune=corei7-avx 2468 options. 2469 * Support for AMD Bobcat (family 14) processors is now available 2470 through the -march=btver1 and -mtune=btver1 options. 2471 * Support for AMD Bulldozer (family 15) processors is now available 2472 through the -march=bdver1 and -mtune=bdver1 options. 2473 * The default setting (when not optimizing for size) for 32-bit 2474 GNU/Linux and Darwin x86 targets has been changed to 2475 -fomit-frame-pointer. The default can be reverted to 2476 -fno-omit-frame-pointer by configuring GCC with the 2477 --enable-frame-pointer configure option. 2478 * Darwin, FreeBSD, Solaris 2, MinGW and Cygwin now all support 2479 __float128 on 32-bit and 64-bit x86 targets. 2480 * AVX floating-point arithmetic can now be enabled by default at 2481 configure time with the new --with-fpmath=avx option. 2482 * The SSA loop prefetching pass is enabled when using -O3 when 2483 optimizing for CPUs where prefetching is beneficial (AMD CPUs newer 2484 than K6). 2485 * Support for TBM (Trailing Bit Manipulation) built-in functions and 2486 code generation is available via -mtbm. 2487 * Support for AMD's BMI (Bit Manipulation) built-in functions and 2488 code generation is available via -mbmi. 2489 2490 MicroBlaze 2491 2492 * Support has been added for the Xilinx MicroBlaze softcore processor 2493 (microblaze-elf) embedded target. This configurable processor is 2494 supported on several Xilinx Spartan and Virtex FPGAs. 2495 2496 MIPS 2497 2498 * GCC now supports the Loongson 3A processor. Its canonical -march= 2499 and -mtune= name is loongson3a. 2500 2501 MN10300 / AM33 2502 2503 * The inline assembly register constraint "A" has been renamed "c". 2504 This constraint is used to select a floating-point register that 2505 can be used as the destination of a multiply-accumulate 2506 instruction. 2507 * New inline assembly register constraints "A" and "D" have been 2508 added. These constraint letters resolve to all general registers 2509 when compiling for AM33, and resolve to address registers only or 2510 data registers only when compiling for MN10300. 2511 * The MDR register is represented in the compiler. One can access the 2512 register via the "z" constraint in inline assembly. It can be 2513 marked as clobbered or used as a local register variable via the 2514 "mdr" name. The compiler uses the RETF instruction if the function 2515 does not modify the MDR register, so it is important that inline 2516 assembly properly annotate any usage of the register. 2517 2518 PowerPC/PowerPC64 2519 2520 * GCC now supports the Applied Micro Titan processor with 2521 -mcpu=titan. 2522 * The -mrecip option has been added, which indicates whether the 2523 reciprocal and reciprocal square root instructions should be used. 2524 * The -mveclibabi=mass option can be used to enable the compiler to 2525 autovectorize mathematical functions using the Mathematical 2526 Acceleration Subsystem library. 2527 * The -msingle-pic-base option has been added, which instructs the 2528 compiler to avoid loading the PIC base register in function 2529 prologues. The PIC base register must be initialized by the runtime 2530 system. 2531 * The -mblock-move-inline-limit option has been added, which enables 2532 the user to control the maximum size of inlined memcpy calls and 2533 similar. 2534 * PowerPC64 GNU/Linux support for applications requiring a large TOC 2535 section has been improved. A new command-line option, 2536 -mcmodel=MODEL, controls this feature; valid values for MODEL are 2537 small, medium, or large. 2538 * The Altivec builtin functions vec_ld and vec_st have been modified 2539 to generate the Altivec memory instructions LVX and STVX, even if 2540 the -mvsx option is used. In the initial GCC 4.5 release, these 2541 builtin functions were changed to generate VSX memory reference 2542 instructions instead of Altivec memory instructions, but there are 2543 differences between the two instructions. If the VSX instruction 2544 set is available, you can now use the new builtin functions 2545 vec_vsx_ld and vec_vsx_st which always generates the VSX memory 2546 instructions. 2547 * The GCC compiler on AIX now defaults to a process layout with a 2548 larger data space allowing larger programs to be compiled. 2549 * The GCC long double type on AIX 6.1 and above has reverted to 64 2550 bit double precision, matching the AIX XL compiler default, because 2551 of missing C99 symbols required by the GCC runtime. 2552 * The default processor scheduling model and tuning for PowerPC64 2553 GNU/Linux and for AIX 6.1 and above now is POWER7. 2554 * Starting with GCC 4.6.1, vectors of type vector long long or vector 2555 long are passed and returned in the same method as other vectors 2556 with the VSX instruction set. Previously the GCC compiler did not 2557 adhere to the ABI for 128-bit vectors with 64-bit integer base 2558 types (PR 48857). This is also fixed in the GCC 4.5.4 release. 2559 2560 S/390, zSeries and System z9/z10, IBM zEnterprise z196 2561 2562 * Support for the zEnterprise z196 processor has been added. When 2563 using the -march=z196 option, the compiler will generate code 2564 making use of the following instruction facilities: 2565 + Conditional load/store 2566 + Distinct-operands 2567 + Floating-point-extension 2568 + Interlocked-access 2569 + Population-count 2570 The -mtune=z196 option avoids the compare and branch instructions 2571 as well as the load address instruction with an index register as 2572 much as possible and performs instruction scheduling appropriate 2573 for the new out-of-order pipeline architecture. 2574 * When using the -m31 -mzarch options the generated code still 2575 conforms to the 32-bit ABI but uses the general purpose registers 2576 as 64-bit registers internally. This requires a Linux kernel saving 2577 the whole 64-bit registers when doing a context switch. Kernels 2578 providing that feature indicate that by the 'highgprs' string in 2579 /proc/cpuinfo. 2580 * The SSA loop prefetching pass is enabled when using -O3. 2581 2582 SPARC 2583 2584 * GCC now supports the LEON series of SPARC V8 processors. The code 2585 generated by the compiler can either be tuned to it by means of the 2586 --with-tune=leon configure option and -mtune=leon compilation 2587 option, or the compiler can be built for the sparc-leon-{elf,linux} 2588 and sparc-leon3-{elf,linux} targets directly. 2589 * GCC has stopped sign/zero-extending parameter registers in the 2590 callee for functions taking parameters with sub-word size in 32-bit 2591 mode, since this is redundant with the specification of the ABI. 2592 GCC has never done so in 64-bit mode since this is also redundant. 2593 * The command line option -mfix-at697f has been added to enable the 2594 documented workaround for the single erratum of the Atmel AT697F 2595 processor. 2596 2597 Operating Systems 2598 2599 Android 2600 2601 * GCC now supports the Bionic C library and provides a convenient way 2602 of building native libraries and applications for the Android 2603 platform. Refer to the documentation of the -mandroid and -mbionic 2604 options for details on building native code. At the moment, Android 2605 support is enabled only for ARM. 2606 2607 Darwin/Mac OS X 2608 2609 * General 2610 + Initial support for CFString types has been added. 2611 This allows GCC to build projects including the system Core 2612 Foundation frameworks. The GCC Objective-C family supports 2613 CFString "toll-free bridged" as per the Mac OS X system tools. 2614 CFString is also recognized in the context of format 2615 attributes and arguments (see the documentation for format 2616 attributes for limitations). At present, 8-bit character types 2617 are supported. 2618 + Object file size reduction. 2619 The Darwin zeroed memory allocators have been re-written to 2620 make more use of .zerofill sections. For non-debug code, this 2621 can reduce object file size significantly. 2622 + Objective-C family 64-bit support (NeXT ABI 2). 2623 Initial support has been added to support 64-bit Objective-C 2624 code using the Darwin/OS X native (NeXT) runtime. ABI version 2625 2 will be selected automatically when 64-bit code is built. 2626 + Objective-C family 32-bit ABI 1. 2627 For 32-bit code ABI 1 is also now also allowed. At present it 2628 must be selected manually using -fobjc-abi-version=1 where 2629 applicable - i.e. on Darwin 9/10 (OS X 10.5/10.6). 2630 * x86 Architecture 2631 + The -mdynamic-no-pic option has been enabled. 2632 Code supporting -mdynamic-no-pic optimization has been added 2633 and is applicable to -m32 builds. The compiler bootstrap uses 2634 the option where appropriate. 2635 + The default value for -mtune= has been changed. 2636 Since Darwin systems are primarily Xeon, Core-2 or similar the 2637 default tuning has been changed to -mtune=core2. 2638 + Enable 128-bit long double (__float128) support on Darwin. 2639 * PPC Architecture 2640 + Darwin64 ABI. 2641 Several significant bugs have been fixed, such that GCC now 2642 produces code compatible with the Darwin64 PowerPC ABI. 2643 + libffi and boehm-gc. 2644 The Darwin ports of the libffi and boehm-gc libraries have 2645 been upgraded to include a Darwin64 implementation. This means 2646 that powerpc*-*-darwin9 platforms may now, for example, build 2647 Java applications with -m64 enabled. 2648 + Plug-in support has been enabled. 2649 + The -fsection-anchors option is now available although, 2650 presently, not heavily tested. 2651 2652 Solaris 2 2653 2654 New Features 2655 2656 * Support symbol versioning with the Sun linker. 2657 * Allow libstdc++ to leverage full ISO C99 support on Solaris 10+. 2658 * Support thread-local storage (TLS) with the Sun assembler on 2659 Solaris 2/x86. 2660 * Support TLS on Solaris 8/9 if prerequisites are met. 2661 * Support COMDAT group with the GNU assembler and recent Sun linker. 2662 * Support the Sun assembler visibility syntax. 2663 * Default Solaris 2/x86 to -march=pentium4 (Solaris 10+) resp. 2664 -march=pentiumpro (Solaris 8/9). 2665 * Don't use SSE on Solaris 8/9 x86 by default. 2666 * Enable 128-bit long double (__float128) support on Solaris 2/x86. 2667 2668 ABI Change 2669 2670 * Change the ABI for returning 8-byte vectors like __m64 in MMX 2671 registers on Solaris 10+/x86 to match the Sun Studio 12.1+ 2672 compilers. This is an incompatible change. If you use such types, 2673 you must either recompile all your code with the new compiler or 2674 use the new -mvect8-ret-in-mem option to remain compatible with 2675 previous versions of GCC and Sun Studio. 2676 2677 Windows x86/x86_64 2678 2679 * Initial support for decimal floating point. 2680 * Support for the __thiscall calling-convention. 2681 * Support for hot-patchable function prologues via the 2682 ms_hook_prologue attribute for x86_64 in addition to 32-bit x86. 2683 * Improvements of stack-probing and stack-allocation mechanisms. 2684 * Support of push/pop-macro pragma as preprocessor command. 2685 With #pragma push_macro("macro-name") the current definition of 2686 macro-name is saved and can be restored with #pragma 2687 pop_macro("macro-name") to its saved definition. 2688 * Enable 128-bit long double (__float128) support on MinGW and 2689 Cygwin. 2690 2691 Other significant improvements 2692 2693 Installation changes 2694 2695 * An install-strip make target is provided that installs stripped 2696 executables, and may install libraries with unneeded or debugging 2697 sections stripped. 2698 * On Power7 systems, there is a potential problem if you build the 2699 GCC compiler with a host compiler using options that enable the VSX 2700 instruction set generation. If the host compiler has been patched 2701 so that the vec_ld and vec_st builtin functions generate Altivec 2702 memory instructions instead of VSX memory instructions, then you 2703 should be able to build the compiler with VSX instruction 2704 generation. 2705 2706 Changes for GCC Developers 2707 2708 Note: these changes concern developers that develop GCC itself or 2709 software that integrates with GCC, such as plugins, and not the general 2710 GCC users. 2711 * The gengtype utility, which previously was internal to the GCC 2712 build process, has been enchanced to provide GC root information 2713 for plugins as necessary. 2714 * The old GC allocation interface of ggc_alloc and friends was 2715 replaced with a type-safe alternative. 2716 2717 GCC 4.6.1 2718 2719 This is the [20]list of problem reports (PRs) from GCC's bug tracking 2720 system that are known to be fixed in the 4.6.1 release. This list might 2721 not be complete (that is, it is possible that some PRs that have been 2722 fixed are not listed here). 2723 2724 GCC 4.6.2 2725 2726 This is the [21]list of problem reports (PRs) from GCC's bug tracking 2727 system that are known to be fixed in the 4.6.2 release. This list might 2728 not be complete (that is, it is possible that some PRs that have been 2729 fixed are not listed here). 2730 2731 GCC 4.6.3 2732 2733 This is the [22]list of problem reports (PRs) from GCC's bug tracking 2734 system that are known to be fixed in the 4.6.3 release. This list might 2735 not be complete (that is, it is possible that some PRs that have been 2736 fixed are not listed here). 2737 2738 GCC 4.6.4 2739 2740 This is the [23]list of problem reports (PRs) from GCC's bug tracking 2741 system that are known to be fixed in the 4.6.4 release. This list might 2742 not be complete (that is, it is possible that some PRs that have been 2743 fixed are not listed here). 2744 2745 2746 For questions related to the use of GCC, please consult these web 2747 pages and the [24]GCC manuals. If that fails, the 2748 [25]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 2749 web pages and the development of GCC are welcome on our developer 2750 list at [26]gcc (a] gcc.gnu.org. All of [27]our lists have public 2751 archives. 2752 2753 Copyright (C) [28]Free Software Foundation, Inc. Verbatim copying and 2754 distribution of this entire article is permitted in any medium, 2755 provided this notice is preserved. 2756 2757 These pages are [29]maintained by the GCC team. Last modified 2758 2013-04-12[30]. 2759 2760 References 2761 2762 1. http://sourceware.org/bugzilla/show_bug.cgi?id=10401 2763 2. http://gcc.gnu.org/gcc-4.5/changes.html 2764 3. http://gcc.gnu.org/gcc-4.5/changes.html#obsoleted 2765 4. http://gcc.gnu.org/gcc-4.6/porting_to.html 2766 5. http://gcc.gnu.org/projects/lto/whopr.pdf 2767 6. http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options 2768 7. http://gcc.gnu.org/gcc-4.6/cxx0x_status.html 2769 8. http://gcc.gnu.org/PR43145 2770 9. http://gcc.gnu.org/PR43680 2771 10. http://gcc.gnu.org/PR33558 2772 11. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#253 2773 12. http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x 2774 13. http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html 2775 14. http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.races 2776 15. http://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html 2777 16. http://gcc.gnu.org/wiki/OOP 2778 17. http://gcc.gnu.org/wiki/Coarray 2779 18. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfcoarray_007d-233 2780 19. http://golang.org/ 2781 20. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.1 2782 21. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.2 2783 22. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.3 2784 23. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.4 2785 24. http://gcc.gnu.org/onlinedocs/ 2786 25. mailto:gcc-help (a] gcc.gnu.org 2787 26. mailto:gcc (a] gcc.gnu.org 2788 27. http://gcc.gnu.org/lists.html 2789 28. http://www.fsf.org/ 2790 29. http://gcc.gnu.org/about.html 2791 30. http://validator.w3.org/check/referer 2792 ====================================================================== 2793 http://gcc.gnu.org/gcc-4.5/index.html 2794 2795 GCC 4.5 Release Series 2796 2797 Jul 2, 2012 2798 2799 The [1]GNU project and the GCC developers are pleased to announce the 2800 release of GCC 4.5.4. 2801 2802 This release is a bug-fix release, containing fixes for regressions in 2803 GCC 4.5.3 relative to previous releases of GCC. 2804 2805 Release History 2806 2807 GCC 4.5.4 2808 Jul 2, 2012 ([2]changes) 2809 2810 GCC 4.5.3 2811 Apr 28, 2011 ([3]changes) 2812 2813 GCC 4.5.2 2814 Dec 16, 2010 ([4]changes) 2815 2816 GCC 4.5.1 2817 Jul 31, 2010 ([5]changes) 2818 2819 GCC 4.5.0 2820 April 14, 2010 ([6]changes) 2821 2822 References and Acknowledgements 2823 2824 GCC used to stand for the GNU C Compiler, but since the compiler 2825 supports several other languages aside from C, it now stands for the 2826 GNU Compiler Collection. 2827 2828 A list of [7]successful builds is updated as new information becomes 2829 available. 2830 2831 The GCC developers would like to thank the numerous people that have 2832 contributed new features, improvements, bug fixes, and other changes as 2833 well as test results to GCC. This [8]amazing group of volunteers is 2834 what makes GCC successful. 2835 2836 For additional information about GCC please refer to the [9]GCC project 2837 web site or contact the [10]GCC development mailing list. 2838 2839 To obtain GCC please use [11]our mirror sites or [12]our SVN server. 2840 2841 2842 For questions related to the use of GCC, please consult these web 2843 pages and the [13]GCC manuals. If that fails, the 2844 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 2845 web pages and the development of GCC are welcome on our developer 2846 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 2847 archives. 2848 2849 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 2850 distribution of this entire article is permitted in any medium, 2851 provided this notice is preserved. 2852 2853 These pages are [18]maintained by the GCC team. Last modified 2854 2012-11-02[19]. 2855 2856 References 2857 2858 1. http://www.gnu.org/ 2859 2. http://gcc.gnu.org/gcc-4.5/changes.html 2860 3. http://gcc.gnu.org/gcc-4.5/changes.html 2861 4. http://gcc.gnu.org/gcc-4.5/changes.html 2862 5. http://gcc.gnu.org/gcc-4.5/changes.html 2863 6. http://gcc.gnu.org/gcc-4.5/changes.html 2864 7. http://gcc.gnu.org/gcc-4.5/buildstat.html 2865 8. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 2866 9. http://gcc.gnu.org/index.html 2867 10. mailto:gcc (a] gcc.gnu.org 2868 11. http://gcc.gnu.org/mirrors.html 2869 12. http://gcc.gnu.org/svn.html 2870 13. http://gcc.gnu.org/onlinedocs/ 2871 14. mailto:gcc-help (a] gcc.gnu.org 2872 15. mailto:gcc (a] gcc.gnu.org 2873 16. http://gcc.gnu.org/lists.html 2874 17. http://www.fsf.org/ 2875 18. http://gcc.gnu.org/about.html 2876 19. http://validator.w3.org/check/referer 2877 ====================================================================== 2878 http://gcc.gnu.org/gcc-4.5/changes.html 2879 2880 GCC 4.5 Release Series 2881 Changes, New Features, and Fixes 2882 2883 Caveats 2884 2885 * GCC now requires the [1]MPC library in order to build. See the 2886 [2]prerequisites page for version requirements. 2887 * Support for a number of older systems and recently unmaintained or 2888 untested target ports of GCC has been declared obsolete in GCC 4.5. 2889 Unless there is activity to revive them, the next release of GCC 2890 will have their sources permanently removed. 2891 The following ports for individual systems on particular 2892 architectures have been obsoleted: 2893 + IRIX releases before 6.5 (mips-sgi-irix5*, 2894 mips-sgi-irix6.[0-4]) 2895 + Solaris 7 (*-*-solaris2.7) 2896 + Tru64 UNIX releases before V5.1 (alpha*-dec-osf4*, 2897 alpha-dec-osf5.0*) 2898 + Details for the IRIX, Solaris 7, and Tru64 UNIX obsoletions 2899 can be found in the [3]announcement. 2900 Support for the classic POWER architecture implemented in the 2901 original RIOS and RIOS2 processors of the old IBM RS/6000 product 2902 line has been obsoleted in the rs6000 port. This does not affect 2903 the new generation Power and PowerPC architectures. 2904 * Support has been removed for all the [4]configurations obsoleted in 2905 GCC 4.4. 2906 * Support has been removed for the protoize and unprotoize utilities, 2907 obsoleted in GCC 4.4. 2908 * Support has been removed for tuning for Itanium1 (Merced) variants. 2909 Note that code tuned for Itanium2 should also run correctly on 2910 Itanium1. 2911 * GCC now generates unwind info also for epilogues. DWARF debuginfo 2912 generated by GCC now uses more features of DWARF3 than before, and 2913 also some DWARF4 features. GDB older than 7.0 is not able to handle 2914 either of these, so to debug GCC 4.5 generated binaries or 2915 libraries GDB 7.0 or later is needed. You can disable use of DWARF4 2916 features with the -gdwarf-3 -gstrict-dwarf options, or use 2917 -gdwarf-2 -gstrict-dwarf to restrict GCC to just DWARF2, but 2918 epilogue unwind info is emitted unconditionally whenever unwind 2919 info is emitted. 2920 * On x86 targets, code containing floating-point calculations may run 2921 significantly slower when compiled with GCC 4.5 in strict C99 2922 conformance mode than they did with earlier GCC versions. This is 2923 due to stricter standard conformance of the compiler and can be 2924 avoided by using the option -fexcess-precision=fast; also see 2925 [5]below. 2926 * The function attribute noinline no longer prevents GCC from cloning 2927 the function. A new attribute noclone has been introduced for this 2928 purpose. Cloning a function means that it is duplicated and the new 2929 copy is specialized for certain contexts (for example when a 2930 parameter is a known constant). 2931 2932 General Optimizer Improvements 2933 2934 * The -save-temps now takes an optional argument. The -save-temps and 2935 -save-temps=cwd switches write the temporary files in the current 2936 working directory based on the original source file. The 2937 -save-temps=obj switch will write files into the directory 2938 specified with the -o option, and the intermediate filenames are 2939 based on the output file. This will allow the user to get the 2940 compiler intermediate files when doing parallel builds without two 2941 builds of the same filename located in different directories from 2942 interfering with each other. 2943 * Debugging dumps are now created in the same directory as the object 2944 file rather than in the current working directory. This allows the 2945 user to get debugging dumps when doing parallel builds without two 2946 builds of the same filename interfering with each other. 2947 * GCC has been integrated with the [6]MPC library. This allows GCC to 2948 evaluate complex arithmetic at compile time [7]more accurately. It 2949 also allows GCC to evaluate calls to complex built-in math 2950 functions having constant arguments and replace them at compile 2951 time with their mathematically equivalent results. In doing so, GCC 2952 can generate correct results regardless of the math library 2953 implementation or floating point precision of the host platform. 2954 This also allows GCC to generate identical results regardless of 2955 whether one compiles in native or cross-compile configurations to a 2956 particular target. The following built-in functions take advantage 2957 of this new capability: cacos, cacosh, casin, casinh, catan, 2958 catanh, ccos, ccosh, cexp, clog, cpow, csin, csinh, csqrt, ctan, 2959 and ctanh. The float and long double variants of these functions 2960 (e.g. csinf and csinl) are also handled. 2961 * A new link-time optimizer has been added ([8]-flto). When this 2962 option is used, GCC generates a bytecode representation of each 2963 input file and writes it to specially-named sections in each object 2964 file. When the object files are linked together, all the function 2965 bodies are read from these named sections and instantiated as if 2966 they had been part of the same translation unit. This enables 2967 interprocedural optimizations to work across different files (and 2968 even different languages), potentially improving the performance of 2969 the generated code. To use the link-timer optimizer, -flto needs to 2970 be specified at compile time and during the final link. If the 2971 program does not require any symbols to be exported, it is possible 2972 to combine -flto and the experimental [9]-fwhopr with 2973 [10]-fwhole-program to allow the interprocedural optimizers to use 2974 more aggressive assumptions. 2975 * The automatic parallelization pass was enhanced to support 2976 parallelization of outer loops. 2977 * Automatic parallelization can be enabled as part of Graphite. In 2978 addition to -ftree-parallelize-loops=, specify 2979 -floop-parallelize-all to enable the Graphite-based optimization. 2980 * The infrastructure for optimizing based on [11]restrict qualified 2981 pointers has been rewritten and should result in code generation 2982 improvements. Optimizations based on restrict qualified pointers 2983 are now also available when using -fno-strict-aliasing. 2984 * There is a new optimization pass that attempts to change prototype 2985 of functions to avoid unused parameters, pass only relevant parts 2986 of structures and turn arguments passed by reference to arguments 2987 passed by value when possible. It is enabled by -O2 and above as 2988 well as -Os and can be manually invoked using the new command-line 2989 switch -fipa-sra. 2990 * GCC now optimize exception handling code. In particular cleanup 2991 regions that are proved to not have any effect are optimized out. 2992 2993 New Languages and Language specific improvements 2994 2995 All languages 2996 2997 * The -fshow-column option is now on by default. This means error 2998 messages now have a column associated with them. 2999 3000 Ada 3001 3002 * Compilation of programs heavily using discriminated record types 3003 with variant parts has been sped up and generates more compact 3004 code. 3005 * Stack checking now works reasonably well on most plaforms. In some 3006 specific cases, stack overflows may still fail to be detected, but 3007 a compile-time warning will be issued for these cases. 3008 3009 C family 3010 3011 * If a header named in a #include directive is not found, the 3012 compiler exits immediately. This avoids a cascade of errors arising 3013 from declarations expected to be found in that header being 3014 missing. 3015 * A new built-in function __builtin_unreachable() has been added that 3016 tells the compiler that control will never reach that point. It may 3017 be used after asm statements that terminate by transferring control 3018 elsewhere, and in other places that are known to be unreachable. 3019 * The -Wlogical-op option now warns for logical expressions such as 3020 (c == 1 && c == 2) and (c != 1 || c != 2), which are likely to be 3021 mistakes. This option is disabled by default. 3022 * An asm goto feature has been added to allow asm statements that 3023 jump to C labels. 3024 * C++0x raw strings are supported for C++ and for C with -std=gnu99. 3025 * The deprecated attribute now takes an optional string argument, for 3026 example, __attribute__((deprecated("text string"))), that will be 3027 printed together with the deprecation warning. 3028 3029 C 3030 3031 * The -Wenum-compare option, which warns when comparing values of 3032 different enum types, now works for C. It formerly only worked for 3033 C++. This warning is enabled by -Wall. It may be avoided by using a 3034 type cast. 3035 * The -Wcast-qual option now warns about casts which are unsafe in 3036 that they permit const-correctness to be violated without further 3037 warnings. Specifically, it warns about cases where a qualifier is 3038 added when all the lower types are not const. For example, it warns 3039 about a cast from char ** to const char **. 3040 * The -Wc++-compat option is significantly improved. It issues new 3041 warnings for: 3042 + Using C++ reserved operator names as identifiers. 3043 + Conversions to enum types without explicit casts. 3044 + Using va_arg with an enum type. 3045 + Using different enum types in the two branches of ?:. 3046 + Using ++ or -- on a variable of enum type. 3047 + Using the same name as both a struct, union or enum tag and a 3048 typedef, unless the typedef refers to the tagged type itself. 3049 + Using a struct, union, or enum which is defined within another 3050 struct or union. 3051 + A struct field defined using a typedef if there is a field in 3052 the struct, or an enclosing struct, whose name is the typedef 3053 name. 3054 + Duplicate definitions at file scope. 3055 + Uninitialized const variables. 3056 + A global variable with an anonymous struct, union, or enum 3057 type. 3058 + Using a string constant to initialize a char array whose size 3059 is the length of the string. 3060 * The new -Wjump-misses-init option warns about cases where a goto or 3061 switch skips the initialization of a variable. This sort of branch 3062 is an error in C++ but not in C. This warning is enabled by 3063 -Wc++-compat. 3064 * GCC now ensures that a C99-conforming <stdint.h> is present on most 3065 targets, and uses information about the types in this header to 3066 implement the Fortran bindings to those types. GCC does not ensure 3067 the presence of such a header, and does not implement the Fortran 3068 bindings, on the following targets: NetBSD, VxWorks, VMS, 3069 SymbianOS, WinCE, LynxOS, Netware, QNX, Interix, TPF. 3070 * GCC now implements C90- and C99-conforming rules for constant 3071 expressions. This may cause warnings or errors for some code using 3072 expressions that can be folded to a constant but are not constant 3073 expressions as defined by ISO C. 3074 * All known target-independent C90 and C90 Amendment 1 conformance 3075 bugs, and all known target-independent C99 conformance bugs not 3076 related to floating point or extended identifiers, have been fixed. 3077 * The C decimal floating point support now includes support for the 3078 FLOAT_CONST_DECIMAL64 pragma. 3079 * The named address space feature from ISO/IEC TR 18037 is now 3080 supported. This is currently only implemented for the SPU 3081 processor. 3082 3083 C++ 3084 3085 * Improved [12]experimental support for the upcoming C++0x ISO C++ 3086 standard, including support for raw strings, lambda expressions and 3087 explicit type conversion operators. 3088 * When printing the name of a class template specialization, G++ will 3089 now omit any template arguments which come from default template 3090 arguments. This behavior (and the pretty-printing of function 3091 template specializations as template signature and arguments) can 3092 be disabled with the -fno-pretty-templates option. 3093 * Access control is now applied to typedef names used in a template, 3094 which may cause G++ to reject some ill-formed code that was 3095 accepted by earlier releases. The -fno-access-control option can be 3096 used as a temporary workaround until the code is corrected. 3097 * Compilation time for code that uses templates should now scale 3098 linearly with the number of instantiations rather than 3099 quadratically, as template instantiations are now looked up using 3100 hash tables. 3101 * Declarations of functions that look like builtin declarations of 3102 library functions are only considered to be redeclarations if they 3103 are declared with extern "C". This may cause problems with code 3104 that omits extern "C" on hand-written declarations of C library 3105 functions such as abort or memcpy. Such code is ill-formed, but was 3106 accepted by earlier releases. 3107 * Diagnostics that used to complain about passing non-POD types to 3108 ... or jumping past the declaration of a non-POD variable now check 3109 for triviality rather than PODness, as per C++0x. 3110 * In C++0x mode local and anonymous classes are now allowed as 3111 template arguments, and in declarations of variables and functions 3112 with linkage, so long as any such declaration that is used is also 3113 defined ([13]DR 757). 3114 * Labels may now have attributes, as has been permitted for a while 3115 in C. This is only permitted when the label definition and the 3116 attribute specifier is followed by a semicolon--i.e., the label 3117 applies to an empty statement. The only useful attribute for a 3118 label is unused. 3119 * G++ now implements [14]DR 176. Previously G++ did not support using 3120 the injected-class-name of a template base class as a type name, 3121 and lookup of the name found the declaration of the template in the 3122 enclosing scope. Now lookup of the name finds the 3123 injected-class-name, which can be used either as a type or as a 3124 template, depending on whether or not the name is followed by a 3125 template argument list. As a result of this change, some code that 3126 was previously accepted may be ill-formed because 3127 1. The injected-class-name is not accessible because it's from a 3128 private base, or 3129 2. The injected-class-name cannot be used as an argument for a 3130 template template parameter. 3131 In either of these cases, the code can be fixed by adding a 3132 nested-name-specifier to explicitly name the template. The first 3133 can be worked around with -fno-access-control; the second is only 3134 rejected with -pedantic. 3135 * A new standard mangling for SIMD vector types has been added, to 3136 avoid name clashes on systems with vectors of varying length. By 3137 default the compiler still uses the old mangling, but emits aliases 3138 with the new mangling on targets that support strong aliases. Users 3139 can switch over entirely to the new mangling with -fabi-version=4 3140 or -fabi-version=0. -Wabi will now warn about code that uses the 3141 old mangling. 3142 * The command-line option -ftemplate-depth-N is now written as 3143 -ftemplate-depth=N and the old form is deprecated. 3144 * Conversions between NULL and non-pointer types are now warned by 3145 default. The new option -Wno-conversion-null disables these 3146 warnings. Previously these warnings were only available when using 3147 -Wconversion explicitly. 3148 3149 Runtime Library (libstdc++) 3150 3151 * [15]Improved experimental support for the upcoming ISO C++ 3152 standard, C++0x, including: 3153 + Support for <future>, <functional>, and <random>. 3154 + Existing facilities now exploit explicit operators and the 3155 newly implemented core C++0x features. 3156 * An experimental [16]profile mode has been added. This is an 3157 implementation of many C++ standard library constructs with an 3158 additional analysis layer that gives performance improvement advice 3159 based on recognition of suboptimal usage patterns. For example, 3160 #include <vector> 3161 int main() 3162 { 3163 std::vector<int> v; 3164 for (int k = 0; k < 1024; ++k) 3165 v.insert(v.begin(), k); 3166 } 3167 3168 When instrumented via the profile mode, can return suggestions 3169 about the initial size and choice of the container used as follows: 3170 vector-to-list: improvement = 5: call stack = 0x804842c ... 3171 : advice = change std::vector to std::list 3172 vector-size: improvement = 3: call stack = 0x804842c ... 3173 : advice = change initial container size from 0 to 1024 3174 3175 These constructs can be substituted for the normal libstdc++ 3176 constructs on a piecemeal basis, or all existing components can be 3177 transformed via the -D_GLIBCXX_PROFILE macro. 3178 * [17]Support for decimal floating-point arithmetic (aka ISO C++ TR 3179 24733) has been added. This support is in header file 3180 <decimal/decimal>, uses namespace std::decimal, and includes 3181 classes decimal32, decimal64, and decimal128. 3182 * Sources have been audited for application of function attributes 3183 nothrow, const, pure, and noreturn. 3184 * Python pretty-printers have been added for many standard library 3185 components that simplify the internal representation and present a 3186 more intuitive view of components when used with 3187 appropriately-advanced versions of GDB. For more information, 3188 please consult the more [18]detailed description. 3189 * The default behavior for comparing typeinfo names has changed, so 3190 in <typeinfo>, __GXX_MERGED_TYPEINFO_NAMES now defaults to zero. 3191 * The new -static-libstdc++ option directs g++ to link the C++ 3192 library statically, even if the default would normally be to link 3193 it dynamically. 3194 3195 Fortran 3196 3197 * The COMMON default padding has been changed - instead of adding the 3198 padding before a variable it is now added afterwards, which 3199 increases the compatibility with other vendors and helps to obtain 3200 the correct output in some cases. Cf. also the -falign-commons 3201 option ([19]added in 4.4). 3202 * The -finit-real= option now also supports the value snan for 3203 signalling not-a-number; to be effective, one additionally needs to 3204 enable trapping (e.g. via -ffpe-trap=). Note: Compile-time 3205 optimizations can turn a signalling NaN into a quiet one. 3206 * The new option -fcheck= has been added with the options bounds, 3207 array-temps, do, pointer, and recursive. The bounds and array-temps 3208 options are equivalent to -fbounds-check and 3209 -fcheck-array-temporaries. The do option checks for invalid 3210 modification of loop iteration variables, and the recursive option 3211 tests for recursive calls to subroutines/functions which are not 3212 marked as recursive. With pointer pointer association checks in 3213 calls are performed; however, neither undefined pointers nor 3214 pointers in expressions are handled. Using -fcheck=all enables all 3215 these run-time checks. 3216 * The run-time checking -fcheck=bounds now warns about invalid string 3217 lengths of character dummy arguments. Additionally, more 3218 compile-time checks have been added. 3219 * The new option [20]-fno-protect-parens has been added; if set, the 3220 compiler may reorder REAL and COMPLEX expressions without regard to 3221 parentheses. 3222 * GNU Fortran no longer links against libgfortranbegin. As before, 3223 MAIN__ (assembler symbol name) is the actual Fortran main program, 3224 which is invoked by the main function. However, main is now 3225 generated and put in the same object file as MAIN__. For the time 3226 being, libgfortranbegin still exists for backward compatibility. 3227 For details see the new [21]Mixed-Language Programming chapter in 3228 the manual. 3229 * The I/O library was restructured for performance and cleaner code. 3230 * Array assignments and WHERE are now run in parallel when OpenMP's 3231 WORKSHARE is used. 3232 * The experimental option -fwhole-file was added. The option allows 3233 whole-file checking of procedure arguments and allows for better 3234 optimizations. It can also be used with -fwhole-program, which is 3235 now also supported in gfortran. 3236 * More Fortran 2003 and Fortran 2008 mathematical functions can now 3237 be used as initialization expressions. 3238 * Some extended attributes such as STDCALL are now supported via the 3239 [22]GCC$ compiler directive. 3240 * For Fortran 77 compatibility: If -fno-sign-zero is used, the SIGN 3241 intrinsic behaves now as if zero were always positive. 3242 * For legacy compatibiliy: On Cygwin and MinGW, the special files 3243 CONOUT$ and CONIN$ (and CONERR$ which maps to CONOUT$) are now 3244 supported. 3245 * Fortran 2003 support has been extended: 3246 + Procedure-pointer function results and procedure-pointer 3247 components (including PASS), 3248 + allocatable scalars (experimental), 3249 + DEFERRED type-bound procedures, 3250 + the ERRMSG= argument of the ALLOCATE and DEALLOCATE statements 3251 have been implemented. 3252 + The ALLOCATE statement supports type-specs and the SOURCE= 3253 argument. 3254 + OPERATOR(*) and ASSIGNMENT(=) are now allowed as GENERIC 3255 type-bound procedure (i.e. as type-bound operators). 3256 + Rounding (ROUND=, RZ, ...) for output is now supported. 3257 + The INT_FAST{8,16,32,64,128}_T kind type parameters of the 3258 intrinsic module ISO_C_BINDING are now supported, except for 3259 the targets listed above as ones where GCC does not have 3260 <stdint.h> type information. 3261 + Extensible derived types with type-bound procedure or 3262 procedure pointer with PASS attribute now have to use CLASS in 3263 line with the Fortran 2003 standard; the workaround to use 3264 TYPE is no longer supported. 3265 + [23]Experimental, incomplete support for polymorphism, 3266 including CLASS, SELECT TYPE and dynamic dispatch of 3267 type-bound procedure calls. Some features do not work yet such 3268 as unlimited polymorphism (CLASS(*)). 3269 * Fortran 2008 support has been extended: 3270 + The OPEN statement now supports the NEWUNIT= option, which 3271 returns a unique file unit, thus preventing inadvertent use of 3272 the same unit in different parts of the program. 3273 + Support for unlimited format items has been added. 3274 + The INT{8,16,32} and REAL{32,64,128} kind type parameters of 3275 the intrinsic module ISO_FORTRAN_ENV are now supported. 3276 + Using complex arguments with TAN, SINH, COSH, TANH, ASIN, 3277 ACOS, and ATAN is now possible; the functions ASINH, ACOSH, 3278 and ATANH have been added (for real and complex arguments) and 3279 ATAN(Y,X) is now an alias for ATAN2(Y,X). 3280 + The BLOCK construct has been implemented. 3281 3282 New Targets and Target Specific Improvements 3283 3284 AIX 3285 3286 * Full cross-toolchain support now available with GNU Binutils 3287 3288 ARM 3289 3290 * GCC now supports the Cortex-M0 and Cortex-A5 processors. 3291 * GCC now supports the ARM v7E-M architecture. 3292 * GCC now supports VFPv4-based FPUs and FPUs with 3293 single-precision-only VFP. 3294 * GCC has many improvements to optimization for other ARM processors, 3295 including scheduling support for the integer pipeline on Cortex-A9. 3296 * GCC now supports the IEEE 754-2008 half-precision floating-point 3297 type, and a variant ARM-specific half-precision type. This type is 3298 specified using __fp16, with the layout determined by 3299 -mfp16-format. With appropriate -mfpu options, the Cortex-A9 and 3300 VFPv4 half-precision instructions will be used. 3301 * GCC now supports the variant of AAPCS that uses VFP registers for 3302 parameter passing and return values. 3303 3304 AVR 3305 3306 * The -mno-tablejump option has been removed because it has the same 3307 effect as the -fno-jump-tables option. 3308 * Added support for these new AVR devices: 3309 + ATmega8U2 3310 + ATmega16U2 3311 + ATmega32U2 3312 3313 IA-32/x86-64 3314 3315 * GCC now will set the default for -march= based on the configure 3316 target. 3317 * GCC now supports handling floating-point excess precision arising 3318 from use of the x87 floating-point unit in a way that conforms to 3319 ISO C99. This is enabled with -fexcess-precision=standard and with 3320 standards conformance options such as -std=c99, and may be disabled 3321 using -fexcess-precision=fast. 3322 * Support for the Intel Atom processor is now available through the 3323 -march=atom and -mtune=atom options. 3324 * A new -mcrc32 option is now available to enable crc32 intrinsics. 3325 * A new -mmovbe option is now available to enable GCC to use the 3326 movbe instruction to implement __builtin_bswap32 and 3327 __builtin_bswap64. 3328 * SSE math now can be enabled by default at configure time with the 3329 new --with-fpmath=sse option. 3330 * There is a new intrinsic header file, <x86intrin.h>. It should be 3331 included before using any IA-32/x86-64 intrinsics. 3332 * Support for the XOP, FMA4, and LWP instruction sets for the AMD 3333 Orochi processors are now available with the -mxop, -mfma4, and 3334 -mlwp options. 3335 * The -mabm option enables GCC to use the popcnt and lzcnt 3336 instructions on AMD processors. 3337 * The -mpopcnt option enables GCC to use the popcnt instructions on 3338 both AMD and Intel processors. 3339 3340 M68K/ColdFire 3341 3342 * GCC now supports ColdFire 51xx, 5221x, 5225x, 52274, 52277, 5301x 3343 and 5441x devices. 3344 * GCC now supports thread-local storage (TLS) on M68K and ColdFire 3345 processors. 3346 3347 MeP 3348 3349 Support has been added for the Toshiba Media embedded Processor (MeP, 3350 or mep-elf) embedded target. 3351 3352 MIPS 3353 3354 * GCC now supports MIPS 1004K processors. 3355 * GCC can now be configured with options --with-arch-32, 3356 --with-arch-64, --with-tune-32 and --with-tune-64 to control the 3357 default optimization separately for 32-bit and 64-bit modes. 3358 * MIPS targets now support an alternative _mcount interface, in which 3359 register $12 points to the function's save slot for register $31. 3360 This interface is selected by the -mcount-ra-address option; see 3361 the documentation for more details. 3362 * GNU/Linux targets can now generate read-only .eh_frame sections. 3363 This optimization requires GNU binutils 2.20 or above, and is only 3364 available if GCC is configured with a suitable version of binutils. 3365 * GNU/Linux targets can now attach special relocations to indirect 3366 calls, so that the linker can turn them into direct jumps or 3367 branches. This optimization requires GNU binutils 2.20 or later, 3368 and is automatically selected if GCC is configured with an 3369 appropriate version of binutils. It can be explicitly enabled or 3370 disabled using the -mrelax-pic-calls command-line option. 3371 * GCC now generates more heavily-optimized atomic operations on 3372 Octeon processors. 3373 * MIPS targets now support the -fstack-protector option. 3374 * GCC now supports an -msynci option, which specifies that synci is 3375 enough to flush the instruction cache, without help from the 3376 operating system. GCC uses this information to optimize 3377 automatically-generated cache flush operations, such as those used 3378 for nested functions in C. There is also a --with-synci 3379 configure-time option, which makes -msynci the default. 3380 * GCC supports four new function attributes for interrupt handlers: 3381 interrupt, use_shadow_register_set, keep_interrupts_masked and 3382 use_debug_exception_return. See the documentation for more details 3383 about these attributes. 3384 3385 RS/6000 (POWER/PowerPC) 3386 3387 * GCC now supports the Power ISA 2.06, which includes the VSX 3388 instructions that add vector 64-bit floating point support, new 3389 population count instructions, and conversions between floating 3390 point and unsigned types. 3391 * Support for the power7 processor is now available through the 3392 -mcpu=power7 and -mtune=power7. 3393 * GCC will now vectorize loops that contain simple math functions 3394 like copysign when generating code for altivec or VSX targets. 3395 * Support for the A2 processor is now available through the -mcpu=a2 3396 and -mtune=a2 options. 3397 * Support for the 476 processor is now available through the 3398 -mcpu={476,476fp} and -mtune={476,476fp} options. 3399 * Support for the e500mc64 processor is now available through the 3400 -mcpu=e500mc64 and -mtune=e500mc64 options. 3401 * GCC can now be configured with options --with-cpu-32, 3402 --with-cpu-64, --with-tune-32 and --with-tune-64 to control the 3403 default optimization separately for 32-bit and 64-bit modes. 3404 * Starting with GCC 4.5.4, vectors of type vector long long or vector 3405 long are passed and returned in the same method as other vectors 3406 with the VSX instruction set. Previously the GCC compiler did not 3407 adhere to the ABI for 128-bit vectors with 64-bit integer base 3408 types (PR 48857). This is also fixed in the GCC 4.6.1 release. 3409 3410 RX 3411 3412 Support has been added for the Renesas RX Processor (rx-elf) target. 3413 3414 Operating Systems 3415 3416 Windows (Cygwin and MinGW) 3417 3418 * GCC now installs all the major language runtime libraries as DLLs 3419 when configured with the --enable-shared option. 3420 * GCC now makes use of the new support for aligned common variables 3421 in versions of binutils >= 2.20 to fix bugs in the support for SSE 3422 data types. 3423 * Improvements to the libffi support library increase the reliability 3424 of code generated by GCJ on all Windows platforms. Libgcj is 3425 enabled by default for the first time. 3426 * Libtool improvements simplify installation by placing the generated 3427 DLLs in the correct binaries directory. 3428 * Numerous other minor bugfixes and improvements, and substantial 3429 enhancements to the Fortran language support library. 3430 3431 > 3432 3433 Other significant improvements 3434 3435 Plugins 3436 3437 * It is now possible to extend the compiler without having to modify 3438 its source code. A new option -fplugin=file.so tells GCC to load 3439 the shared object file.so and execute it as part of the compiler. 3440 The internal documentation describes the details on how plugins can 3441 interact with the compiler. 3442 3443 Installation changes 3444 3445 * The move to newer autotools changed default installation 3446 directories and switches to control them: The --with-datarootdir, 3447 --with-docdir, --with-pdfdir, and --with-htmldir switches are not 3448 used any more. Instead, you can now use --datarootdir, --docdir, 3449 --htmldir, and --pdfdir. The default installation directories have 3450 changed as follows according to the GNU Coding Standards: 3451 3452 datarootdir read-only architecture-independent data root [PREFIX/share] 3453 localedir locale-specific message catalogs [DATAROOTDIR/locale] 3454 docdir documentation root [DATAROOTDIR/doc/PACKAGE] 3455 htmldir html documentation [DOCDIR] 3456 dvidir dvi documentation [DOCDIR] 3457 pdfdir pdf documentation [DOCDIR] 3458 psdir ps documentation [DOCDIR] 3459 The following variables have new default values: 3460 3461 datadir read-only architecture-independent data [DATAROOTDIR] 3462 infodir info documentation [DATAROOTDIR/info] 3463 mandir man documentation [DATAROOTDIR/man] 3464 3465 GCC 4.5.1 3466 3467 This is the [24]list of problem reports (PRs) from GCC's bug tracking 3468 system that are known to be fixed in the 4.5.1 release. This list might 3469 not be complete (that is, it is possible that some PRs that have been 3470 fixed are not listed here). 3471 3472 All languages 3473 3474 * GCC's new link-time optimizer ([25]-flto) now also works on a few 3475 non-ELF targets: 3476 + Cygwin (*-cygwin*) 3477 + MinGW (*-mingw*) 3478 + Darwin on x86-64 (x86_64-apple-darwin*) 3479 LTO is not enabled by default for these targets. To enable LTO, you 3480 should configure with the --enable-lto option. 3481 3482 GCC 4.5.2 3483 3484 This is the [26]list of problem reports (PRs) from GCC's bug tracking 3485 system that are known to be fixed in the 4.5.2 release. This list might 3486 not be complete (that is, it is possible that some PRs that have been 3487 fixed are not listed here). 3488 3489 GCC 4.5.3 3490 3491 This is the [27]list of problem reports (PRs) from GCC's bug tracking 3492 system that are known to be fixed in the 4.5.3 release. This list might 3493 not be complete (that is, it is possible that some PRs that have been 3494 fixed are not listed here). 3495 3496 On the PowerPC compiler, the Altivec builtin functions vec_ld and 3497 vec_st have been modified to generate the Altivec memory instructions 3498 LVX and STVX, even if the -mvsx option is used. In the initial GCC 4.5 3499 release, these builtin functions were changed to generate VSX memory 3500 reference instructions instead of Altivec memory instructions, but 3501 there are differences between the two instructions. If the VSX 3502 instruction set is available, you can now use the new builtin functions 3503 vec_vsx_ld and vec_vsx_st which always generates the VSX memory 3504 instructions. 3505 3506 GCC 4.5.4 3507 3508 This is the [28]list of problem reports (PRs) from GCC's bug tracking 3509 system that are known to be fixed in the 4.5.4 release. This list might 3510 not be complete (that is, it is possible that some PRs that have been 3511 fixed are not listed here). 3512 3513 3514 For questions related to the use of GCC, please consult these web 3515 pages and the [29]GCC manuals. If that fails, the 3516 [30]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 3517 web pages and the development of GCC are welcome on our developer 3518 list at [31]gcc (a] gcc.gnu.org. All of [32]our lists have public 3519 archives. 3520 3521 Copyright (C) [33]Free Software Foundation, Inc. Verbatim copying and 3522 distribution of this entire article is permitted in any medium, 3523 provided this notice is preserved. 3524 3525 These pages are [34]maintained by the GCC team. Last modified 3526 2012-11-02[35]. 3527 3528 References 3529 3530 1. http://www.multiprecision.org/ 3531 2. http://gcc.gnu.org/install/prerequisites.html 3532 3. http://gcc.gnu.org/ml/gcc/2010-01/msg00510.html 3533 4. http://gcc.gnu.org/gcc-4.4/changes.html#obsoleted 3534 5. http://gcc.gnu.org/gcc-4.5/changes.html#x86 3535 6. http://www.multiprecision.org/ 3536 7. http://gcc.gnu.org/PR30789 3537 8. http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flto-801 3538 9. http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fwhopr-802 3539 10. http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fwhole-program-800 3540 11. http://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html 3541 12. http://gcc.gnu.org/gcc-4.5/cxx0x_status.html 3542 13. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#757 3543 14. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#176 3544 15. http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x 3545 16. http://gcc.gnu.org/onlinedocs/libstdc++/manual/profile_mode.html 3546 17. http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr24733 3547 18. http://sourceware.org/gdb/wiki/STLSupport 3548 19. http://gcc.gnu.org/gcc-4.4/changes.html 3549 20. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html 3550 21. http://gcc.gnu.org/onlinedocs/gfortran/Mixed-Language-Programming.html 3551 22. http://gcc.gnu.org/onlinedocs/gfortran/GNU-Fortran-Compiler-Directives.html 3552 23. http://gcc.gnu.org/wiki/OOP 3553 24. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.1 3554 25. http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flto-801 3555 26. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.2 3556 27. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.3 3557 28. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.5.4 3558 29. http://gcc.gnu.org/onlinedocs/ 3559 30. mailto:gcc-help (a] gcc.gnu.org 3560 31. mailto:gcc (a] gcc.gnu.org 3561 32. http://gcc.gnu.org/lists.html 3562 33. http://www.fsf.org/ 3563 34. http://gcc.gnu.org/about.html 3564 35. http://validator.w3.org/check/referer 3565 ====================================================================== 3566 http://gcc.gnu.org/gcc-4.4/index.html 3567 3568 GCC 4.4 Release Series 3569 3570 March 13, 2012 3571 3572 The [1]GNU project and the GCC developers are pleased to announce the 3573 release of GCC 4.4.7. 3574 3575 This release is a bug-fix release, containing fixes for regressions in 3576 GCC 4.4.6 relative to previous releases of GCC. 3577 3578 Release History 3579 3580 GCC 4.4.7 3581 March 13, 2012 ([2]changes) 3582 3583 GCC 4.4.6 3584 April 16, 2011 ([3]changes) 3585 3586 GCC 4.4.5 3587 October 1, 2010 ([4]changes) 3588 3589 GCC 4.4.4 3590 April 29, 2010 ([5]changes) 3591 3592 GCC 4.4.3 3593 January 21, 2010 ([6]changes) 3594 3595 GCC 4.4.2 3596 October 15, 2009 ([7]changes) 3597 3598 GCC 4.4.1 3599 July 22, 2009 ([8]changes) 3600 3601 GCC 4.4.0 3602 April 21, 2009 ([9]changes) 3603 3604 References and Acknowledgements 3605 3606 GCC used to stand for the GNU C Compiler, but since the compiler 3607 supports several other languages aside from C, it now stands for the 3608 GNU Compiler Collection. 3609 3610 A list of [10]successful builds is updated as new information becomes 3611 available. 3612 3613 The GCC developers would like to thank the numerous people that have 3614 contributed new features, improvements, bug fixes, and other changes as 3615 well as test results to GCC. This [11]amazing group of volunteers is 3616 what makes GCC successful. 3617 3618 For additional information about GCC please refer to the [12]GCC 3619 project web site or contact the [13]GCC development mailing list. 3620 3621 To obtain GCC please use [14]our mirror sites or [15]our SVN server. 3622 3623 3624 For questions related to the use of GCC, please consult these web 3625 pages and the [16]GCC manuals. If that fails, the 3626 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 3627 web pages and the development of GCC are welcome on our developer 3628 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 3629 archives. 3630 3631 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 3632 distribution of this entire article is permitted in any medium, 3633 provided this notice is preserved. 3634 3635 These pages are [21]maintained by the GCC team. Last modified 3636 2012-11-02[22]. 3637 3638 References 3639 3640 1. http://www.gnu.org/ 3641 2. http://gcc.gnu.org/gcc-4.4/changes.html 3642 3. http://gcc.gnu.org/gcc-4.4/changes.html 3643 4. http://gcc.gnu.org/gcc-4.4/changes.html 3644 5. http://gcc.gnu.org/gcc-4.4/changes.html 3645 6. http://gcc.gnu.org/gcc-4.4/changes.html 3646 7. http://gcc.gnu.org/gcc-4.4/changes.html 3647 8. http://gcc.gnu.org/gcc-4.4/changes.html 3648 9. http://gcc.gnu.org/gcc-4.4/changes.html 3649 10. http://gcc.gnu.org/gcc-4.4/buildstat.html 3650 11. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 3651 12. http://gcc.gnu.org/index.html 3652 13. mailto:gcc (a] gcc.gnu.org 3653 14. http://gcc.gnu.org/mirrors.html 3654 15. http://gcc.gnu.org/svn.html 3655 16. http://gcc.gnu.org/onlinedocs/ 3656 17. mailto:gcc-help (a] gcc.gnu.org 3657 18. mailto:gcc (a] gcc.gnu.org 3658 19. http://gcc.gnu.org/lists.html 3659 20. http://www.fsf.org/ 3660 21. http://gcc.gnu.org/about.html 3661 22. http://validator.w3.org/check/referer 3662 ====================================================================== 3663 http://gcc.gnu.org/gcc-4.4/changes.html 3664 3665 GCC 4.4 Release Series 3666 Changes, New Features, and Fixes 3667 3668 The latest release in the 4.4 release series is [1]GCC 4.4.7. 3669 3670 Caveats 3671 3672 * __builtin_stdarg_start has been completely removed from GCC. 3673 Support for <varargs.h> had been deprecated since GCC 4.0. Use 3674 __builtin_va_start as a replacement. 3675 * Some of the errors issued by the C++ front end that could be 3676 downgraded to warnings in previous releases by using -fpermissive 3677 are now warnings by default. They can be converted into errors by 3678 using -pedantic-errors. 3679 * Use of the cpp assertion extension will now emit a warning when 3680 -Wdeprecated or -pedantic is used. This extension has been 3681 deprecated for many years, but never warned about. 3682 * Packed bit-fields of type char were not properly bit-packed on many 3683 targets prior to GCC 4.4. On these targets, the fix in GCC 4.4 3684 causes an ABI change. For example there is no longer a 4-bit 3685 padding between field a and b in this structure: 3686 struct foo 3687 { 3688 char a:4; 3689 char b:8; 3690 } __attribute__ ((packed)); 3691 There is a new warning to help identify fields that are affected: 3692 foo.c:5: note: Offset of packed bit-field 'b' has changed in GCC 4.4 3693 The warning can be disabled with -Wno-packed-bitfield-compat. 3694 * On ARM EABI targets, the C++ mangling of the va_list type has been 3695 changed to conform to the current revision of the EABI. This does 3696 not affect the libstdc++ library included with GCC. 3697 * The SCOUNT and POS bits of the MIPS DSP control register are now 3698 treated as global. Previous versions of GCC treated these fields as 3699 call-clobbered instead. 3700 * The MIPS port no longer recognizes the h asm constraint. It was 3701 necessary to remove this constraint in order to avoid generating 3702 unpredictable code sequences. 3703 One of the main uses of the h constraint was to extract the high 3704 part of a multiplication on 64-bit targets. For example: 3705 asm ("dmultu\t%1,%2" : "=h" (result) : "r" (x), "r" (y)); 3706 You can now achieve the same effect using 128-bit types: 3707 typedef unsigned int uint128_t __attribute__((mode(TI))); 3708 result = ((uint128_t) x * y) >> 64; 3709 The second sequence is better in many ways. For example, if x and y 3710 are constants, the compiler can perform the multiplication at 3711 compile time. If x and y are not constants, the compiler can 3712 schedule the runtime multiplication better than it can schedule an 3713 asm statement. 3714 * Support for a number of older systems and recently unmaintained or 3715 untested target ports of GCC has been declared obsolete in GCC 4.4. 3716 Unless there is activity to revive them, the next release of GCC 3717 will have their sources permanently removed. 3718 The following ports for individual systems on particular 3719 architectures have been obsoleted: 3720 + Generic a.out on IA32 and m68k (i[34567]86-*-aout*, 3721 m68k-*-aout*) 3722 + Generic COFF on ARM, H8300, IA32, m68k and SH (arm-*-coff*, 3723 armel-*-coff*, h8300-*-*, i[34567]86-*-coff*, m68k-*-coff*, 3724 sh-*-*). This does not affect other more specific targets 3725 using the COFF object format on those architectures, or the 3726 more specific H8300 and SH targets (h8300-*-rtems*, 3727 h8300-*-elf*, sh-*-elf*, sh-*-symbianelf*, sh-*-linux*, 3728 sh-*-netbsdelf*, sh-*-rtems*, sh-wrs-vxworks). 3729 + 2BSD on PDP-11 (pdp11-*-bsd) 3730 + AIX 4.1 and 4.2 on PowerPC (rs6000-ibm-aix4.[12]*, 3731 powerpc-ibm-aix4.[12]*) 3732 + Tuning support for Itanium1 (Merced) variants. Note that code 3733 tuned for Itanium2 should also run correctly on Itanium1. 3734 * The protoize and unprotoize utilities have been obsoleted and will 3735 be removed in GCC 4.5. These utilities have not been installed by 3736 default since GCC 3.0. 3737 * Support has been removed for all the [2]configurations obsoleted in 3738 GCC 4.3. 3739 * Unknown -Wno-* options are now silently ignored by GCC if no other 3740 diagnostics are issued. If other diagnostics are issued, then GCC 3741 warns about the unknown options. 3742 * More information on porting to GCC 4.4 from previous versions of 3743 GCC can be found in the [3]porting guide for this release. 3744 3745 General Optimizer Improvements 3746 3747 * A new command-line switch -findirect-inlining has been added. When 3748 turned on it allows the inliner to also inline indirect calls that 3749 are discovered to have known targets at compile time thanks to 3750 previous inlining. 3751 * A new command-line switch -ftree-switch-conversion has been added. 3752 This new pass turns simple initializations of scalar variables in 3753 switch statements into initializations from a static array, given 3754 that all the values are known at compile time and the ratio between 3755 the new array size and the original switch branches does not exceed 3756 the parameter --param switch-conversion-max-branch-ratio (default 3757 is eight). 3758 * A new command-line switch -ftree-builtin-call-dce has been added. 3759 This optimization eliminates unnecessary calls to certain builtin 3760 functions when the return value is not used, in cases where the 3761 calls can not be eliminated entirely because the function may set 3762 errno. This optimization is on by default at -O2 and above. 3763 * A new command-line switch -fconserve-stack directs the compiler to 3764 minimize stack usage even if it makes the generated code slower. 3765 This affects inlining decisions. 3766 * When the assembler supports it, the compiler will now emit unwind 3767 information using assembler .cfi directives. This makes it possible 3768 to use such directives in inline assembler code. The new option 3769 -fno-dwarf2-cfi-asm directs the compiler to not use .cfi 3770 directives. 3771 * The [4]Graphite branch has been merged. This merge has brought in a 3772 new framework for loop optimizations based on a polyhedral 3773 intermediate representation. These optimizations apply to all the 3774 languages supported by GCC. The following new code transformations 3775 are available in GCC 4.4: 3776 + -floop-interchange performs loop interchange transformations 3777 on loops. Interchanging two nested loops switches the inner 3778 and outer loops. For example, given a loop like: 3779 DO J = 1, M 3780 DO I = 1, N 3781 A(J, I) = A(J, I) * C 3782 ENDDO 3783 ENDDO 3784 3785 loop interchange will transform the loop as if the user had 3786 written: 3787 DO I = 1, N 3788 DO J = 1, M 3789 A(J, I) = A(J, I) * C 3790 ENDDO 3791 ENDDO 3792 3793 which can be beneficial when N is larger than the caches, 3794 because in Fortran, the elements of an array are stored in 3795 memory contiguously by column, and the original loop iterates 3796 over rows, potentially creating at each access a cache miss. 3797 + -floop-strip-mine performs loop strip mining transformations 3798 on loops. Strip mining splits a loop into two nested loops. 3799 The outer loop has strides equal to the strip size and the 3800 inner loop has strides of the original loop within a strip. 3801 For example, given a loop like: 3802 DO I = 1, N 3803 A(I) = A(I) + C 3804 ENDDO 3805 3806 loop strip mining will transform the loop as if the user had 3807 written: 3808 DO II = 1, N, 4 3809 DO I = II, min (II + 3, N) 3810 A(I) = A(I) + C 3811 ENDDO 3812 ENDDO 3813 3814 + -floop-block performs loop blocking transformations on loops. 3815 Blocking strip mines each loop in the loop nest such that the 3816 memory accesses of the element loops fit inside caches. For 3817 example, given a loop like: 3818 DO I = 1, N 3819 DO J = 1, M 3820 A(J, I) = B(I) + C(J) 3821 ENDDO 3822 ENDDO 3823 3824 loop blocking will transform the loop as if the user had 3825 written: 3826 DO II = 1, N, 64 3827 DO JJ = 1, M, 64 3828 DO I = II, min (II + 63, N) 3829 DO J = JJ, min (JJ + 63, M) 3830 A(J, I) = B(I) + C(J) 3831 ENDDO 3832 ENDDO 3833 ENDDO 3834 ENDDO 3835 3836 which can be beneficial when M is larger than the caches, 3837 because the innermost loop will iterate over a smaller amount 3838 of data that can be kept in the caches. 3839 * A new register allocator has replaced the old one. It is called 3840 integrated register allocator (IRA) because coalescing, register 3841 live range splitting, and hard register preferencing are done 3842 on-the-fly during coloring. It also has better integration with the 3843 reload pass. IRA is a regional register allocator which uses modern 3844 Chaitin-Briggs coloring instead of Chow's priority coloring used in 3845 the old register allocator. More info about IRA internals and 3846 options can be found in the GCC manuals. 3847 * A new instruction scheduler and software pipeliner, based on the 3848 selective scheduling approach, has been added. The new pass 3849 performs instruction unification, register renaming, substitution 3850 through register copies, and speculation during scheduling. The 3851 software pipeliner is able to pipeline non-countable loops. The new 3852 pass is targeted at scheduling-eager in-order platforms. In GCC 4.4 3853 it is available for the Intel Itanium platform working by default 3854 as the second scheduling pass (after register allocation) at the 3855 -O3 optimization level. 3856 * When using -fprofile-generate with a multi-threaded program, the 3857 profile counts may be slightly wrong due to race conditions. The 3858 new -fprofile-correction option directs the compiler to apply 3859 heuristics to smooth out the inconsistencies. By default the 3860 compiler will give an error message when it finds an inconsistent 3861 profile. 3862 * The new -fprofile-dir=PATH option permits setting the directory 3863 where profile data files are stored when using -fprofile-generate 3864 and friends, and the directory used when reading profile data files 3865 using -fprofile-use and friends. 3866 3867 New warning options 3868 3869 * The new -Wframe-larger-than=NUMBER option directs GCC to emit a 3870 warning if any stack frame is larger than NUMBER bytes. This may be 3871 used to help ensure that code fits within a limited amount of stack 3872 space. 3873 * The command-line option -Wlarger-than-N is now written as 3874 -Wlarger-than=N and the old form is deprecated. 3875 * The new -Wno-mudflap option disables warnings about constructs 3876 which can not be instrumented when using -fmudflap. 3877 3878 New Languages and Language specific improvements 3879 3880 * Version 3.0 of the [5]OpenMP specification is now supported for the 3881 C, C++, and Fortran compilers. 3882 * New character data types, per [6]TR 19769: New character types in 3883 C, are now supported for the C compiler in -std=gnu99 mode, as 3884 __CHAR16_TYPE__ and __CHAR32_TYPE__, and for the C++ compiler in 3885 -std=c++0x and -std=gnu++0x modes, as char16_t and char32_t too. 3886 3887 C family 3888 3889 * A new optimize attribute was added to allow programmers to change 3890 the optimization level and particular optimization options for an 3891 individual function. You can also change the optimization options 3892 via the GCC optimize pragma for functions defined after the pragma. 3893 The GCC push_options pragma and the GCC pop_options pragma allow 3894 you temporarily save and restore the options used. The GCC 3895 reset_options pragma restores the options to what was specified on 3896 the command line. 3897 * Uninitialized warnings do not require enabling optimization 3898 anymore, that is, -Wuninitialized can be used together with -O0. 3899 Nonetheless, the warnings given by -Wuninitialized will probably be 3900 more accurate if optimization is enabled. 3901 * -Wparentheses now warns about expressions such as (!x | y) and (!x 3902 & y). Using explicit parentheses, such as in ((!x) | y), silences 3903 this warning. 3904 * -Wsequence-point now warns within if, while,do while and for 3905 conditions, and within for begin/end expressions. 3906 * A new option -dU is available to dump definitions of preprocessor 3907 macros that are tested or expanded. 3908 3909 C++ 3910 3911 * [7]Improved experimental support for the upcoming ISO C++ standard, 3912 C++0x. Including support for auto, inline namespaces, generalized 3913 initializer lists, defaulted and deleted functions, new character 3914 types, and scoped enums. 3915 * Those errors that may be downgraded to warnings to build legacy 3916 code now mention -fpermissive when -fdiagnostics-show-option is 3917 enabled. 3918 * -Wconversion now warns if the result of a static_cast to enumeral 3919 type is unspecified because the value is outside the range of the 3920 enumeral type. 3921 * -Wuninitialized now warns if a non-static reference or non-static 3922 const member appears in a class without constructors. 3923 * G++ now properly implements value-initialization, so objects with 3924 an initializer of () and an implicitly defined default constructor 3925 will be zero-initialized before the default constructor is called. 3926 3927 Runtime Library (libstdc++) 3928 3929 * [8]Improved experimental support for the upcoming ISO C++ standard, 3930 C++0x, including: 3931 + Support for <chrono>, <condition_variable>, <cstdatomic>, 3932 <forward_list>, <initializer_list>, <mutex>, <ratio>, 3933 <system_error>, and <thread>. 3934 + unique_ptr, <algorithm> additions, exception propagation, and 3935 support for the new character types in <string> and <limits>. 3936 + Existing facilities now exploit initializer lists, defaulted 3937 and deleted functions, and the newly implemented core C++0x 3938 features. 3939 + Some standard containers are more efficient together with 3940 stateful allocators, i.e., no allocator is constructed on the 3941 fly at element construction time. 3942 * Experimental support for non-standard pointer types in containers. 3943 * The long standing libstdc++/30928 has been fixed for targets 3944 running glibc 2.10 or later. 3945 * As usual, many small and larger bug fixes, in particular quite a 3946 few corner cases in <locale>. 3947 3948 Fortran 3949 3950 * GNU Fortran now employs libcpp directly instead of using cc1 as an 3951 external preprocessor. The [9]-cpp option was added to allow manual 3952 invocation of the preprocessor without relying on filename 3953 extensions. 3954 * The [10]-Warray-temporaries option warns about array temporaries 3955 generated by the compiler, as an aid to optimization. 3956 * The [11]-fcheck-array-temporaries option has been added, printing a 3957 notification at run time, when an array temporary had to be created 3958 for an function argument. Contrary to -Warray-temporaries the 3959 warning is only printed if the array is noncontiguous. 3960 * Improved generation of DWARF debugging symbols 3961 * If using an intrinsic not part of the selected standard (via -std= 3962 and -fall-intrinsics) gfortran will now treat it as if this 3963 procedure were declared EXTERNAL and try to link to a user-supplied 3964 procedure. -Wintrinsics-std will warn whenever this happens. The 3965 now-useless option -Wnonstd-intrinsic was removed. 3966 * The flag -falign-commons has been added to control the alignment of 3967 variables in COMMON blocks, which is enabled by default in line 3968 with previous GCC version. Using -fno-align-commons one can force 3969 commons to be contiguous in memory as required by the Fortran 3970 standard, however, this slows down the memory access. The option 3971 -Walign-commons, which is enabled by default, warns when padding 3972 bytes were added for alignment. The proper solution is to sort the 3973 common objects by decreasing storage size, which avoids the 3974 alignment problems. 3975 * Fortran 2003 support has been extended: 3976 + Wide characters (ISO 10646, UCS-4, kind=4) and UTF-8 I/O is 3977 now supported (except internal reads from/writes to wide 3978 strings). [12]-fbackslash now supports also \unnnn and 3979 \Unnnnnnnn to enter Unicode characters. 3980 + Asynchronous I/O (implemented as synchronous I/O) and the 3981 decimal=, size=, sign=, pad=, blank=, and delim= specifiers 3982 are now supported in I/O statements. 3983 + Support for Fortran 2003 structure constructors and for array 3984 constructor with typespec has been added. 3985 + Procedure Pointers (but not yet as component in derived types 3986 and as function results) are now supported. 3987 + Abstract types, type extension, and type-bound procedures 3988 (both PROCEDURE and GENERIC but not as operators). Note: As 3989 CLASS/polymorphyic types are not implemented, type-bound 3990 procedures with PASS accept as non-standard extension TYPE 3991 arguments. 3992 * Fortran 2008 support has been added: 3993 + The -std=f2008 option and support for the file extensions 3994 .f2008 and .F2008 has been added. 3995 + The g0 format descriptor is now supported. 3996 + The Fortran 2008 mathematical intrinsics ASINH, ACOSH, ATANH, 3997 ERF, ERFC, GAMMA, LOG_GAMMA, BESSEL_*, HYPOT, and ERFC_SCALED 3998 are now available (some of them existed as GNU extension 3999 before). Note: The hyperbolic functions are not yet supporting 4000 complex arguments and the three- argument version of BESSEL_*N 4001 is not available. 4002 + The bit intrinsics LEADZ and TRAILZ have been added. 4003 4004 Java (GCJ) 4005 4006 Ada 4007 4008 * The Ada runtime now supports multilibs on many platforms including 4009 x86_64, SPARC and PowerPC. Their build is enabled by default. 4010 4011 New Targets and Target Specific Improvements 4012 4013 ARM 4014 4015 * GCC now supports optimizing for the Cortex-A9, Cortex-R4 and 4016 Cortex-R4F processors and has many other improvements to 4017 optimization for ARM processors. 4018 * GCC now supports the VFPv3 variant with 16 double-precision 4019 registers with -mfpu=vfpv3-d16. The option -mfpu=vfp3 has been 4020 renamed to -mfpu=vfpv3. 4021 * GCC now supports the -mfix-cortex-m3-ldrd option to work around an 4022 erratum on Cortex-M3 processors. 4023 * GCC now supports the __sync_* atomic operations for ARM EABI 4024 GNU/Linux. 4025 * The section anchors optimization is now enabled by default when 4026 optimizing for ARM. 4027 * GCC now uses a new EABI-compatible profiling interface for EABI 4028 targets. This requires a function __gnu_mcount_nc, which is 4029 provided by GNU libc versions 2.8 and later. 4030 4031 AVR 4032 4033 * The -mno-tablejump option has been deprecated because it has the 4034 same effect as the -fno-jump-tables option. 4035 * Added support for these new AVR devices: 4036 + ATA6289 4037 + ATtiny13A 4038 + ATtiny87 4039 + ATtiny167 4040 + ATtiny327 4041 + ATmega8C1 4042 + ATmega16C1 4043 + ATmega32C1 4044 + ATmega8M1 4045 + ATmega16M1 4046 + ATmega32M1 4047 + ATmega32U4 4048 + ATmega16HVB 4049 + ATmega4HVD 4050 + ATmega8HVD 4051 + ATmega64C1 4052 + ATmega64M1 4053 + ATmega16U4 4054 + ATmega32U6 4055 + ATmega128RFA1 4056 + AT90PWM81 4057 + AT90SCR100 4058 + M3000F 4059 + M3000S 4060 + M3001B 4061 4062 IA-32/x86-64 4063 4064 * Support for Intel AES built-in functions and code generation is 4065 available via -maes. 4066 * Support for Intel PCLMUL built-in function and code generation is 4067 available via -mpclmul. 4068 * Support for Intel AVX built-in functions and code generation is 4069 available via -mavx. 4070 * Automatically align the stack for local variables with alignment 4071 requirement. 4072 * GCC can now utilize the SVML library for vectorizing calls to a set 4073 of C99 functions if -mveclibabi=svml is specified and you link to 4074 an SVML ABI compatible library. 4075 * On x86-64, the ABI has been changed in the following cases to 4076 conform to the x86-64 ABI: 4077 + Passing/returning structures with flexible array member: 4078 struct foo 4079 { 4080 int i; 4081 int flex[]; 4082 }; 4083 + Passing/returning structures with complex float member: 4084 struct foo 4085 { 4086 int i; 4087 __complex__ float f; 4088 }; 4089 + Passing/returning unions with long double member: 4090 union foo 4091 { 4092 int x; 4093 long double ld; 4094 }; 4095 Code built with previous versions of GCC that uses any of these is 4096 not compatible with code built with GCC 4.4.0 or later. 4097 * A new target attribute was added to allow programmers to change the 4098 target options like -msse2 or -march=k8 for an individual function. 4099 You can also change the target options via the GCC target pragma 4100 for functions defined after the pragma. 4101 * GCC can now be configured with options --with-arch-32, 4102 --with-arch-64, --with-cpu-32, --with-cpu-64, --with-tune-32 and 4103 --with-tune-64 to control the default optimization separately for 4104 32-bit and 64-bit modes. 4105 4106 IA-32/IA64 4107 4108 * Support for __float128 (TFmode) IEEE quad type and corresponding 4109 TCmode IEEE complex quad type is available via the soft-fp library 4110 on IA-32/IA64 targets. This includes basic arithmetic operations 4111 (addition, subtraction, negation, multiplication and division) on 4112 __float128 real and TCmode complex values, the full set of IEEE 4113 comparisons between __float128 values, conversions to and from 4114 float, double and long double floating point types, as well as 4115 conversions to and from signed or unsigned integer, signed or 4116 unsigned long integer and signed or unsigned quad (TImode, IA64 4117 only) integer types. Additionally, all operations generate the full 4118 set of IEEE exceptions and support the full set of IEEE rounding 4119 modes. 4120 4121 M68K/ColdFire 4122 4123 * GCC now supports instruction scheduling for ColdFire V1, V3 and V4 4124 processors. (Scheduling support for ColdFire V2 processors was 4125 added in GCC 4.3.) 4126 * GCC now supports the -mxgot option to support programs requiring 4127 many GOT entries on ColdFire. 4128 * The m68k-*-linux-gnu target now builds multilibs by default. 4129 4130 MIPS 4131 4132 * MIPS Technologies have extended the original MIPS SVR4 ABI to 4133 include support for procedure linkage tables (PLTs) and copy 4134 relocations. These extensions allow GNU/Linux executables to use a 4135 significantly more efficient code model than the one defined by the 4136 original ABI. 4137 GCC support for this code model is available via a new command-line 4138 option, -mplt. There is also a new configure-time option, 4139 --with-mips-plt, to make -mplt the default. 4140 The new code model requires support from the assembler, the linker, 4141 and the runtime C library. This support is available in binutils 4142 2.19 and GLIBC 2.9. 4143 * GCC can now generate MIPS16 code for 32-bit GNU/Linux executables 4144 and 32-bit GNU/Linux shared libraries. This feature requires GNU 4145 binutils 2.19 or above. 4146 * Support for RMI's XLR processor is now available through the 4147 -march=xlr and -mtune=xlr options. 4148 * 64-bit targets can now perform 128-bit multiplications inline, 4149 instead of relying on a libgcc function. 4150 * Native GNU/Linux toolchains now support -march=native and 4151 -mtune=native, which select the host processor. 4152 * GCC now supports the R10K, R12K, R14K and R16K processors. The 4153 canonical -march= and -mtune= names for these processors are 4154 r10000, r12000, r14000 and r16000 respectively. 4155 * GCC can now work around the side effects of speculative execution 4156 on R10K processors. Please see the documentation of the 4157 -mr10k-cache-barrier option for details. 4158 * Support for the MIPS64 Release 2 instruction set has been added. 4159 The option -march=mips64r2 enables generation of these 4160 instructions. 4161 * GCC now supports Cavium Networks' Octeon processor. This support is 4162 available through the -march=octeon and -mtune=octeon options. 4163 * GCC now supports STMicroelectronics' Loongson 2E/2F processors. The 4164 canonical -march= and -mtune= names for these processors are 4165 loongson2e and loongson2f. 4166 4167 picochip 4168 4169 Picochip is a 16-bit processor. A typical picoChip contains over 250 4170 small cores, each with small amounts of memory. There are three 4171 processor variants (STAN, MEM and CTRL) with different instruction sets 4172 and memory configurations and they can be chosen using the -mae option. 4173 4174 This port is intended to be a "C" only port. 4175 4176 Power Architecture and PowerPC 4177 4178 * GCC now supports the e300c2, e300c3 and e500mc processors. 4179 * GCC now supports Xilinx processors with a single-precision FPU. 4180 * Decimal floating point is now supported for e500 processors. 4181 4182 S/390, zSeries and System z9/z10 4183 4184 * Support for the IBM System z10 EC/BC processor has been added. When 4185 using the -march=z10 option, the compiler will generate code making 4186 use of instructions provided by the General-Instruction-Extension 4187 Facility and the Execute-Extension Facility. 4188 4189 VxWorks 4190 4191 * GCC now supports the thread-local storage mechanism used on 4192 VxWorks. 4193 4194 Xtensa 4195 4196 * GCC now supports thread-local storage (TLS) for Xtensa processor 4197 configurations that include the Thread Pointer option. TLS also 4198 requires support from the assembler and linker; this support is 4199 provided in the GNU binutils beginning with version 2.19. 4200 4201 Documentation improvements 4202 4203 Other significant improvements 4204 4205 GCC 4.4.1 4206 4207 This is the [13]list of problem reports (PRs) from GCC's bug tracking 4208 system that are known to be fixed in the 4.4.1 release. This list might 4209 not be complete (that is, it is possible that some PRs that have been 4210 fixed are not listed here). 4211 4212 GCC 4.4.2 4213 4214 This is the [14]list of problem reports (PRs) from GCC's bug tracking 4215 system that are known to be fixed in the 4.4.2 release. This list might 4216 not be complete (that is, it is possible that some PRs that have been 4217 fixed are not listed here). 4218 4219 GCC 4.4.3 4220 4221 This is the [15]list of problem reports (PRs) from GCC's bug tracking 4222 system that are known to be fixed in the 4.4.3 release. This list might 4223 not be complete (that is, it is possible that some PRs that have been 4224 fixed are not listed here). 4225 4226 GCC 4.4.4 4227 4228 This is the [16]list of problem reports (PRs) from GCC's bug tracking 4229 system that are known to be fixed in the 4.4.4 release. This list might 4230 not be complete (that is, it is possible that some PRs that have been 4231 fixed are not listed here). 4232 4233 GCC 4.4.5 4234 4235 This is the [17]list of problem reports (PRs) from GCC's bug tracking 4236 system that are known to be fixed in the 4.4.5 release. This list might 4237 not be complete (that is, it is possible that some PRs that have been 4238 fixed are not listed here). 4239 4240 GCC 4.4.6 4241 4242 This is the [18]list of problem reports (PRs) from GCC's bug tracking 4243 system that are known to be fixed in the 4.4.6 release. This list might 4244 not be complete (that is, it is possible that some PRs that have been 4245 fixed are not listed here). 4246 4247 GCC 4.4.7 4248 4249 This is the [19]list of problem reports (PRs) from GCC's bug tracking 4250 system that are known to be fixed in the 4.4.7 release. This list might 4251 not be complete (that is, it is possible that some PRs that have been 4252 fixed are not listed here). 4253 4254 4255 For questions related to the use of GCC, please consult these web 4256 pages and the [20]GCC manuals. If that fails, the 4257 [21]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 4258 web pages and the development of GCC are welcome on our developer 4259 list at [22]gcc (a] gcc.gnu.org. All of [23]our lists have public 4260 archives. 4261 4262 Copyright (C) [24]Free Software Foundation, Inc. Verbatim copying and 4263 distribution of this entire article is permitted in any medium, 4264 provided this notice is preserved. 4265 4266 These pages are [25]maintained by the GCC team. Last modified 4267 2012-11-02[26]. 4268 4269 References 4270 4271 1. http://gcc.gnu.org/gcc-4.4/changes.html#4.4.7 4272 2. http://gcc.gnu.org/gcc-4.3/changes.html#obsoleted 4273 3. http://gcc.gnu.org/gcc-4.4/porting_to.html 4274 4. http://gcc.gnu.org/wiki/Graphite 4275 5. http://openmp.org/wp/openmp-specifications/ 4276 6. http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1040.pdf 4277 7. http://gcc.gnu.org/gcc-4.4/cxx0x_status.html 4278 8. http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#id476343 4279 9. http://gcc.gnu.org/onlinedocs/gfortran/Preprocessing-Options.html 4280 10. http://gcc.gnu.org/onlinedocs/gfortran/Error-and-Warning-Options.html#index-g_t_0040code_007bWarray-temporaries_007d-125 4281 11. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfcheck-array-temporaries_007d-221 4282 12. http://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html#index-g_t_0040code_007bbackslash_007d-34 4283 13. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.1 4284 14. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.2 4285 15. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.3 4286 16. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.4 4287 17. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.5 4288 18. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.6 4289 19. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.7 4290 20. http://gcc.gnu.org/onlinedocs/ 4291 21. mailto:gcc-help (a] gcc.gnu.org 4292 22. mailto:gcc (a] gcc.gnu.org 4293 23. http://gcc.gnu.org/lists.html 4294 24. http://www.fsf.org/ 4295 25. http://gcc.gnu.org/about.html 4296 26. http://validator.w3.org/check/referer 4297 ====================================================================== 4298 http://gcc.gnu.org/gcc-4.3/index.html 4299 4300 GCC 4.3 Release Series 4301 4302 Jun 27, 2011 4303 4304 The [1]GNU project and the GCC developers are pleased to announce the 4305 release of GCC 4.3.6. 4306 4307 This release is a bug-fix release, containing fixes for regressions in 4308 GCC 4.3.5 relative to previous releases of GCC. 4309 4310 Release History 4311 4312 GCC 4.3.6 4313 Jun 27, 2011 ([2]changes) 4314 4315 GCC 4.3.5 4316 May 22, 2010 ([3]changes) 4317 4318 GCC 4.3.4 4319 August 4, 2009 ([4]changes) 4320 4321 GCC 4.3.3 4322 January 24, 2009 ([5]changes) 4323 4324 GCC 4.3.2 4325 August 27, 2008 ([6]changes) 4326 4327 GCC 4.3.1 4328 June 6, 2008 ([7]changes) 4329 4330 GCC 4.3.0 4331 March 5, 2008 ([8]changes) 4332 4333 References and Acknowledgements 4334 4335 GCC used to stand for the GNU C Compiler, but since the compiler 4336 supports several other languages aside from C, it now stands for the 4337 GNU Compiler Collection. 4338 4339 A list of [9]successful builds is updated as new information becomes 4340 available. 4341 4342 The GCC developers would like to thank the numerous people that have 4343 contributed new features, improvements, bug fixes, and other changes as 4344 well as test results to GCC. This [10]amazing group of volunteers is 4345 what makes GCC successful. 4346 4347 For additional information about GCC please refer to the [11]GCC 4348 project web site or contact the [12]GCC development mailing list. 4349 4350 To obtain GCC please use [13]our mirror sites or [14]our SVN server. 4351 4352 4353 For questions related to the use of GCC, please consult these web 4354 pages and the [15]GCC manuals. If that fails, the 4355 [16]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 4356 web pages and the development of GCC are welcome on our developer 4357 list at [17]gcc (a] gcc.gnu.org. All of [18]our lists have public 4358 archives. 4359 4360 Copyright (C) [19]Free Software Foundation, Inc. Verbatim copying and 4361 distribution of this entire article is permitted in any medium, 4362 provided this notice is preserved. 4363 4364 These pages are [20]maintained by the GCC team. Last modified 4365 2012-11-02[21]. 4366 4367 References 4368 4369 1. http://www.gnu.org/ 4370 2. http://gcc.gnu.org/gcc-4.3/changes.html 4371 3. http://gcc.gnu.org/gcc-4.3/changes.html 4372 4. http://gcc.gnu.org/gcc-4.3/changes.html 4373 5. http://gcc.gnu.org/gcc-4.3/changes.html 4374 6. http://gcc.gnu.org/gcc-4.3/changes.html 4375 7. http://gcc.gnu.org/gcc-4.3/changes.html 4376 8. http://gcc.gnu.org/gcc-4.3/changes.html 4377 9. http://gcc.gnu.org/gcc-4.3/buildstat.html 4378 10. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 4379 11. http://gcc.gnu.org/index.html 4380 12. mailto:gcc (a] gcc.gnu.org 4381 13. http://gcc.gnu.org/mirrors.html 4382 14. http://gcc.gnu.org/svn.html 4383 15. http://gcc.gnu.org/onlinedocs/ 4384 16. mailto:gcc-help (a] gcc.gnu.org 4385 17. mailto:gcc (a] gcc.gnu.org 4386 18. http://gcc.gnu.org/lists.html 4387 19. http://www.fsf.org/ 4388 20. http://gcc.gnu.org/about.html 4389 21. http://validator.w3.org/check/referer 4390 ====================================================================== 4391 http://gcc.gnu.org/gcc-4.3/changes.html 4392 4393 GCC 4.3 Release Series 4394 Changes, New Features, and Fixes 4395 4396 The latest release in the 4.3 release series is [1]GCC 4.3.5. 4397 4398 Caveats 4399 4400 * GCC requires the [2]GMP and [3]MPFR libraries for building all the 4401 various front-end languages it supports. See the [4]prerequisites 4402 page for version requirements. 4403 * ColdFire targets now treat long double as having the same format as 4404 double. In earlier versions of GCC, they used the 68881 long double 4405 format instead. 4406 * The m68k-uclinux target now uses the same calling conventions as 4407 m68k-linux-gnu. You can select the original calling conventions by 4408 configuring for m68k-uclinuxoldabi instead. Note that 4409 m68k-uclinuxoldabi also retains the original 80-bit long double on 4410 ColdFire targets. 4411 * The -fforce-mem option has been removed because it has had no 4412 effect in the last few GCC releases. 4413 * The i386 -msvr3-shlib option has been removed since it is no longer 4414 used. 4415 * Fastcall for i386 has been changed not to pass aggregate arguments 4416 in registers, following Microsoft compilers. 4417 * Support for the AOF assembler has been removed from the ARM back 4418 end; this affects only the targets arm-semi-aof and armel-semi-aof, 4419 which are no longer recognized. We removed these targets without a 4420 deprecation period because we discovered that they have been 4421 unusable since GCC 4.0.0. 4422 * Support for the TMS320C3x/C4x processor (targets c4x-* and tic4x-*) 4423 has been removed. This support had been deprecated since GCC 4.0.0. 4424 * Support for a number of older systems and recently unmaintained or 4425 untested target ports of GCC has been declared obsolete in GCC 4.3. 4426 Unless there is activity to revive them, the next release of GCC 4427 will have their sources permanently removed. 4428 All GCC ports for the following processor architectures have been 4429 declared obsolete: 4430 + Morpho MT (mt-*) 4431 The following aliases for processor architectures have been 4432 declared obsolete. Users should use the indicated generic target 4433 names instead, with compile-time options such as -mcpu or 4434 configure-time options such as --with-cpu to control the 4435 configuration more precisely. 4436 + strongarm*-*-*, ep9312*-*-*, xscale*-*-* (use arm*-*-* 4437 instead). 4438 + parisc*-*-* (use hppa*-*-* instead). 4439 + m680[012]0-*-* (use m68k-*-* instead). 4440 All GCC ports for the following operating systems have been 4441 declared obsolete: 4442 + BeOS (*-*-beos*) 4443 + kaOS (*-*-kaos*) 4444 + GNU/Linux using the a.out object format (*-*-linux*aout*) 4445 + GNU/Linux using version 1 of the GNU C Library 4446 (*-*-linux*libc1*) 4447 + Solaris versions before Solaris 7 (*-*-solaris2.[0-6], 4448 *-*-solaris2.[0-6].*) 4449 + Miscellaneous System V (*-*-sysv*) 4450 + WindISS (*-*-windiss*) 4451 Also, those for some individual systems on particular architectures 4452 have been obsoleted: 4453 + UNICOS/mk on DEC Alpha (alpha*-*-unicosmk*) 4454 + CRIS with a.out object format (cris-*-aout) 4455 + BSD 4.3 on PA-RISC (hppa1.1-*-bsd*) 4456 + OSF/1 on PA-RISC (hppa1.1-*-osf*) 4457 + PRO on PA-RISC (hppa1.1-*-pro*) 4458 + Sequent PTX on IA32 (i[34567]86-sequent-ptx4*, 4459 i[34567]86-sequent-sysv4*) 4460 + SCO Open Server 5 on IA32 (i[34567]86-*-sco3.2v5*) 4461 + UWIN on IA32 (i[34567]86-*-uwin*) (support for UWIN as a host 4462 was previously [5]removed in 2001, leaving only the support 4463 for UWIN as a target now being deprecated) 4464 + ChorusOS on PowerPC (powerpc-*-chorusos*) 4465 + All VAX configurations apart from NetBSD and OpenBSD 4466 (vax-*-bsd*, vax-*-sysv*, vax-*-ultrix*) 4467 * The [6]-Wconversion option has been modified. Its purpose now is to 4468 warn for implicit conversions that may alter a value. This new 4469 behavior is available for both C and C++. Warnings about 4470 conversions between signed and unsigned integers can be disabled by 4471 using -Wno-sign-conversion. In C++, they are disabled by default 4472 unless -Wsign-conversion is explicitly requested. The old behavior 4473 of -Wconversion, that is, warn for prototypes causing a type 4474 conversion that is different from what would happen to the same 4475 argument in the absence of a prototype, has been moved to a new 4476 option -Wtraditional-conversion, which is only available for C. 4477 * The -m386, -m486, -mpentium and -mpentiumpro tuning options have 4478 been removed because they were deprecated for more than 3 GCC major 4479 releases. Use -mtune=i386, -mtune=i486, -mtune=pentium or 4480 -mtune=pentiumpro as a replacement. 4481 * The -funsafe-math-optimizations option now automatically turns on 4482 -fno-trapping-math in addition to -fno-signed-zeros, as it enables 4483 reassociation and thus may introduce or remove traps. 4484 * The -ftree-vectorize option is now on by default under -O3. In 4485 order to generate code for a SIMD extension, it has to be enabled 4486 as well: use -maltivec for PowerPC platforms and -msse/-msse2 for 4487 i?86 and x86_64. 4488 * More information on porting to GCC 4.3 from previous versions of 4489 GCC can be found in the [7]porting guide for this release. 4490 4491 General Optimizer Improvements 4492 4493 * The GCC middle-end has been integrated with the [8]MPFR library. 4494 This allows GCC to evaluate and replace at compile-time calls to 4495 built-in math functions having constant arguments with their 4496 mathematically equivalent results. In making use of [9]MPFR, GCC 4497 can generate correct results regardless of the math library 4498 implementation or floating point precision of the host platform. 4499 This also allows GCC to generate identical results regardless of 4500 whether one compiles in native or cross-compile configurations to a 4501 particular target. The following built-in functions take advantage 4502 of this new capability: acos, acosh, asin, asinh, atan2, atan, 4503 atanh, cbrt, cos, cosh, drem, erf, erfc, exp10, exp2, exp, expm1, 4504 fdim, fma, fmax, fmin, gamma_r, hypot, j0, j1, jn, lgamma_r, log10, 4505 log1p, log2, log, pow10, pow, remainder, remquo, sin, sincos, sinh, 4506 tan, tanh, tgamma, y0, y1 and yn. The float and long double 4507 variants of these functions (e.g. sinf and sinl) are also handled. 4508 The sqrt and cabs functions with constant arguments were already 4509 optimized in prior GCC releases. Now they also use [10]MPFR. 4510 * A new forward propagation pass on RTL was added. The new pass 4511 replaces several slower transformations, resulting in compile-time 4512 improvements as well as better code generation in some cases. 4513 * A new command-line switch -frecord-gcc-switches has been added to 4514 GCC, although it is only enabled for some targets. The switch 4515 causes the command line that was used to invoke the compiler to be 4516 recorded into the object file that is being created. The exact 4517 format of this recording is target and binary file format 4518 dependent, but it usually takes the form of a note section 4519 containing ASCII text. The switch is related to the -fverbose-asm 4520 switch, but that one only records the information in the assembler 4521 output file as comments, so the information never reaches the 4522 object file. 4523 * The inliner heuristic is now aware of stack frame consumption. New 4524 command-line parameters --param large-stack-frame and --param 4525 large-stack-frame-growth can be used to limit stack frame size 4526 growth caused by inlining. 4527 * During feedback directed optimizations, the expected block size the 4528 memcpy, memset and bzero functions operate on is discovered and for 4529 cases of commonly used small sizes, specialized inline code is 4530 generated. 4531 * __builtin_expect no longer requires its argument to be a compile 4532 time constant. 4533 * Interprocedural optimization was reorganized to work on functions 4534 in SSA form. This enables more precise and cheaper dataflow 4535 analysis and makes writing interprocedural optimizations easier. 4536 The following improvements have been implemented on top of this 4537 framework: 4538 + Pre-inline optimization: Selected local optimization passes 4539 are run before the inliner (and other interprocedural passes) 4540 are executed. This significantly improves the accuracy of code 4541 growth estimates used by the inliner and reduces the overall 4542 memory footprint for large compilation units. 4543 + Early inlining (a simple bottom-up inliner pass inlining only 4544 functions whose body is smaller than the expected call 4545 overhead) is now executed with the early optimization passes, 4546 thus inlining already optimized function bodies into an 4547 unoptimized function that is subsequently optimized by early 4548 optimizers. This enables the compiler to quickly eliminate 4549 abstraction penalty in C++ programs. 4550 + Interprocedural constant propagation now operate on SSA form 4551 increasing accuracy of the analysis. 4552 * A new internal representation for GIMPLE statements has been 4553 contributed, resulting in compile-time memory savings. 4554 * The vectorizer was enhanced to support vectorization of outer 4555 loops, intra-iteration parallelism (loop-aware SLP), vectorization 4556 of strided accesses and loops with multiple data-types. Run-time 4557 dependency testing using loop versioning was added. The cost model, 4558 turned on by -fvect-cost-model, was developed. 4559 4560 New Languages and Language specific improvements 4561 4562 * We have added new command-line options 4563 -finstrument-functions-exclude-function-list and 4564 -finstrument-functions-exclude-file-list. They provide more control 4565 over which functions are annotated by the -finstrument-functions 4566 option. 4567 4568 C family 4569 4570 * Implicit conversions between generic vector types are now only 4571 permitted when the two vectors in question have the same number of 4572 elements and compatible element types. (Note that the restriction 4573 involves compatible element types, not implicitly-convertible 4574 element types: thus, a vector type with element type int may not be 4575 implicitly converted to a vector type with element type unsigned 4576 int.) This restriction, which is in line with specifications for 4577 SIMD architectures such as AltiVec, may be relaxed using the flag 4578 -flax-vector-conversions. This flag is intended only as a 4579 compatibility measure and should not be used for new code. 4580 * -Warray-bounds has been added and is now enabled by default for 4581 -Wall . It produces warnings for array subscripts that can be 4582 determined at compile time to be always out of bounds. 4583 -Wno-array-bounds will disable the warning. 4584 * The constructor and destructor function attributes now accept 4585 optional priority arguments which control the order in which the 4586 constructor and destructor functions are run. 4587 * New [11]command-line options -Wtype-limits, 4588 -Wold-style-declaration, -Wmissing-parameter-type, -Wempty-body, 4589 -Wclobbered and -Wignored-qualifiers have been added for finer 4590 control of the diverse warnings enabled by -Wextra. 4591 * A new function attribute alloc_size has been added to mark up 4592 malloc style functions. For constant sized allocations this can be 4593 used to find out the size of the returned pointer using the 4594 __builtin_object_size() function for buffer overflow checking and 4595 similar. This supplements the already built-in malloc and calloc 4596 constant size handling. 4597 * Integer constants written in binary are now supported as a GCC 4598 extension. They consist of a prefix 0b or 0B, followed by a 4599 sequence of 0 and 1 digits. 4600 * A new predefined macro __COUNTER__ has been added. It expands to 4601 sequential integral values starting from 0. In conjunction with the 4602 ## operator, this provides a convenient means to generate unique 4603 identifiers. 4604 * A new command-line option -fdirectives-only has been added. It 4605 enables a special preprocessing mode which improves the performance 4606 of applications like distcc and ccache. 4607 * Fixed-point data types and operators have been added. They are 4608 based on Chapter 4 of the Embedded-C specification (n1169.pdf). 4609 Currently, only MIPS targets are supported. 4610 * Decimal floating-point arithmetic based on draft ISO/IEC TR 24732, 4611 N1241, is now supported as a GCC extension to C for targets 4612 i[34567]86-*-linux-gnu, powerpc*-*-linux-gnu, s390*-ibm-linux-gnu, 4613 and x86_64-*-linux-gnu. The feature introduces new data types 4614 _Decimal32, _Decimal64, and _Decimal128 with constant suffixes DF, 4615 DD, and DL. 4616 4617 C++ 4618 4619 * [12]Experimental support for the upcoming ISO C++ standard, C++0x. 4620 * -Wc++0x-compat has been added and is now enabled by default for 4621 -Wall. It produces warnings for constructs whose meaning differs 4622 between ISO C++ 1998 and C++0x. 4623 * The -Wparentheses option now works for C++ as it does for C. It 4624 warns if parentheses are omitted when operators with confusing 4625 precedence are nested. It also warns about ambiguous else 4626 statements. Since -Wparentheses is enabled by -Wall, this may cause 4627 additional warnings with existing C++ code which uses -Wall. These 4628 new warnings may be disabled by using -Wall -Wno-parentheses. 4629 * The -Wmissing-declarations now works for C++ as it does for C. 4630 * The -fvisibility-ms-compat flag was added, to make it easier to 4631 port larger projects using shared libraries from Microsoft's Visual 4632 Studio to ELF and Mach-O systems. 4633 * C++ attribute handling has been overhauled for template arguments 4634 (ie dependent types). In particular, __attribute__((aligned(T))); 4635 works for C++ types. 4636 4637 Runtime Library (libstdc++) 4638 4639 * [13]Experimental support for the upcoming ISO C++ standard, C++0x. 4640 * Support for TR1 mathematical special functions and regular 4641 expressions. ([14]Implementation status of TR1) 4642 * Default what implementations give more elaborate exception strings 4643 for bad_cast, bad_typeid, bad_exception, and bad_alloc. 4644 * Header dependencies have been streamlined, reducing unnecessary 4645 includes and pre-processed bloat. 4646 * Variadic template implementations of items in <tuple> and 4647 <functional>. 4648 * An experimental [15]parallel mode has been added. This is a 4649 parallel implementation of many C++ Standard library algorithms, 4650 like std::accumulate, std::for_each, std::transform, or std::sort, 4651 to give but four examples. These algorithms can be substituted for 4652 the normal (sequential) libstdc++ algorithms on a piecemeal basis, 4653 or all existing algorithms can be transformed via the 4654 -D_GLIBCXX_PARALLEL macro. 4655 * Debug mode versions of classes in <unordered_set> and 4656 <unordered_map>. 4657 * Formal deprecation of <ext/hash_set> and <ext/hash_map>, which are 4658 now <backward/hash_set> and <backward/hash_map>. This code: 4659 #include <ext/hash_set> 4660 __gnu_cxx::hash_set<int> s; 4661 4662 Can be transformed (in order of preference) to: 4663 #include <tr1/unordered_set> 4664 std::tr1::unordered_set<int> s; 4665 4666 or 4667 #include <backward/hash_set> 4668 __gnu_cxx::hash_set<int> s; 4669 4670 Similar transformations apply to __gnu_cxx::hash_map, 4671 __gnu_cxx::hash_multimap, __gnu_cxx::hash_set, 4672 __gnu_cxx::hash_multiset. 4673 4674 Fortran 4675 4676 * Due to the fact that the [16]GMP and [17]MPFR libraries are 4677 required for all languages, Fortran is no longer special in this 4678 regard and is available by default. 4679 * The [18]-fexternal-blas option has been added, which generates 4680 calls to BLAS routines for intrinsic matrix operations such as 4681 matmul rather than using the built-in algorithms. 4682 * Support to give a backtrace (compiler flag -fbacktrace or 4683 environment variable GFORTRAN_ERROR_BACKTRACE; on glibc systems 4684 only) or a core dump (-fdump-core, GFORTRAN_ERROR_DUMPCORE) when a 4685 run-time error occured. 4686 * GNU Fortran now defines __GFORTRAN__ when it runs the C 4687 preprocessor (CPP). 4688 * The [19]-finit-local-zero, -finit-real, -finit-integer, 4689 -finit-character, and -finit-logical options have been added, which 4690 can be used to initialize local variables. 4691 * The intrinsic procedures [20]GAMMA and [21]LGAMMA have been added, 4692 which calculate the Gamma function and its logarithm. Use EXTERNAL 4693 gamma if you want to use your own gamma function. 4694 * GNU Fortran now regards the backslash character as literal (as 4695 required by the Fortran 2003 standard); using [22]-fbackslash GNU 4696 Fortran interprets backslashes as C-style escape characters. 4697 * The [23]interpretation of binary, octal and hexadecimal (BOZ) 4698 literal constants has been changed. Before they were always 4699 interpreted as integer; now they are bit-wise transferred as 4700 argument of INT, REAL, DBLE and CMPLX as required by the Fortran 4701 2003 standard, and for real and complex variables in DATA 4702 statements or when directly assigned to real and complex variables. 4703 Everywhere else and especially in expressions they are still 4704 regarded as integer constants. 4705 * Fortran 2003 support has been extended: 4706 + Intrinsic statements IMPORT, PROTECTED, VALUE and VOLATILE 4707 + Pointer intent 4708 + Intrinsic module ISO_ENV_FORTRAN 4709 + Interoperability with C (ISO C Bindings) 4710 + ABSTRACT INTERFACES and PROCEDURE statements (without POINTER 4711 attribute) 4712 + Fortran 2003 BOZ 4713 4714 Java (GCJ) 4715 4716 * GCJ now uses the Eclipse Java compiler for its Java parsing needs. 4717 This enables the use of all 1.5 language features, and fixes most 4718 existing front end bugs. 4719 * libgcj now supports all 1.5 language features which require runtime 4720 support: foreach, enum, annotations, generics, and auto-boxing. 4721 * We've made many changes to the tools shipped with gcj. 4722 + The old jv-scan tool has been removed. This tool never really 4723 worked properly. There is no replacement. 4724 + gcjh has been rewritten. Some of its more obscure options no 4725 longer work, but are still recognized in an attempt at 4726 compatibility. gjavah is a new program with similar 4727 functionality but different command-line options. 4728 + grmic and grmiregistry have been rewritten. grmid has been 4729 added. 4730 + gjar replaces the old fastjar. 4731 + gjarsigner (used for signing jars), gkeytool (used for key 4732 management), gorbd (for CORBA), gserialver (computes 4733 serialization UIDs), and gtnameserv (also for CORBA) are now 4734 installed. 4735 * The ability to dump the contents of the java run time heap to a 4736 file for off-line analysis has been added. The heap dumps may be 4737 analyzed with the new gc-analyze tool. They may be generated on 4738 out-of-memory conditions or on demand and are controlled by the new 4739 run time class gnu.gcj.util.GCInfo. 4740 * java.util.TimeZone can now read files from /usr/share/zoneinfo to 4741 provide correct, updated, timezone information. This means that 4742 packagers no longer have to update libgcj when a time zone change 4743 is published. 4744 4745 New Targets and Target Specific Improvements 4746 4747 IA-32/x86-64 4748 4749 * Tuning for Intel Core 2 processors is available via -mtune=core2 4750 and -march=core2. 4751 * Tuning for AMD Geode processors is available via -mtune=geode and 4752 -march=geode. 4753 * Code generation of block move (memcpy) and block set (memset) was 4754 rewritten. GCC can now pick the best algorithm (loop, unrolled 4755 loop, instruction with rep prefix or a library call) based on the 4756 size of the block being copied and the CPU being optimized for. A 4757 new option -minline-stringops-dynamically has been added. With this 4758 option string operations of unknown size are expanded such that 4759 small blocks are copied by in-line code, while for large blocks a 4760 library call is used. This results in faster code than 4761 -minline-all-stringops when the library implementation is capable 4762 of using cache hierarchy hints. The heuristic choosing the 4763 particular algorithm can be overwritten via -mstringop-strategy. 4764 Newly also memset of values different from 0 is inlined. 4765 * GCC no longer places the cld instruction before string operations. 4766 Both i386 and x86-64 ABI documents mandate the direction flag to be 4767 clear at the entry of a function. It is now invalid to set the flag 4768 in asm statement without reseting it afterward. 4769 * Support for SSSE3 built-in functions and code generation are 4770 available via -mssse3. 4771 * Support for SSE4.1 built-in functions and code generation are 4772 available via -msse4.1. 4773 * Support for SSE4.2 built-in functions and code generation are 4774 available via -msse4.2. 4775 * Both SSE4.1 and SSE4.2 support can be enabled via -msse4. 4776 * A new set of options -mpc32, -mpc64 and -mpc80 have been added to 4777 allow explicit control of x87 floating point precision. 4778 * Support for __float128 (TFmode) IEEE quad type and corresponding 4779 TCmode IEEE complex quad type is available via the soft-fp library 4780 on x86_64 targets. This includes basic arithmetic operations 4781 (addition, subtraction, negation, multiplication and division) on 4782 __float128 real and TCmode complex values, the full set of IEEE 4783 comparisons between __float128 values, conversions to and from 4784 float, double and long double floating point types, as well as 4785 conversions to and from signed or unsigned integer, signed or 4786 unsigned long integer and signed or unsigned quad (TImode) integer 4787 types. Additionally, all operations generate the full set of IEEE 4788 exceptions and support the full set of IEEE rounding modes. 4789 * GCC can now utilize the ACML library for vectorizing calls to a set 4790 of C99 functions on x86_64 if -mveclibabi=acml is specified and you 4791 link to an ACML ABI compatible library. 4792 4793 ARM 4794 4795 * Compiler and Library support for Thumb-2 and the ARMv7 architecture 4796 has been added. 4797 4798 CRIS 4799 4800 New features 4801 4802 * Compiler and Library support for the CRIS v32 architecture, as 4803 found in Axis Communications ETRAX FS and ARTPEC-3 chips, has been 4804 added. 4805 4806 Configuration changes 4807 4808 * The cris-*-elf target now includes support for CRIS v32, including 4809 libraries, through the -march=v32 option. 4810 * A new crisv32-*-elf target defaults to generate code for CRIS v32. 4811 * A new crisv32-*-linux* target defaults to generate code for CRIS 4812 v32. 4813 * The cris-*-aout target has been obsoleted. 4814 4815 Improved support for built-in functions 4816 4817 * GCC can now use the lz and swapwbr instructions to implement the 4818 __builtin_clz, __builtin_ctz and __builtin_ffs family of functions. 4819 * __builtin_bswap32 is now implemented using the swapwb instruction, 4820 when available. 4821 4822 m68k and ColdFire 4823 4824 New features 4825 4826 * Support for several new ColdFire processors has been added. You can 4827 generate code for them using the new -mcpu option. 4828 * All targets now support ColdFire processors. 4829 * m68k-uclinux targets have improved support for C++ constructors and 4830 destructors, and for shared libraries. 4831 * It is now possible to set breakpoints on the first or last line of 4832 a function, even if there are no statements on that line. 4833 4834 Optimizations 4835 4836 * Support for sibling calls has been added. 4837 * More use is now made of the ColdFire mov3q instruction. 4838 * __builtin_clz is now implemented using the ff1 ColdFire 4839 instruction, when available. 4840 * GCC now honors the -m68010 option. 68010 code now uses clr rather 4841 than move to zero volatile memory. 4842 * 68020 targets and above can now use symbol(index.size*scale) 4843 addresses for indexed array accesses. Earlier compilers would 4844 always load the symbol into a base register first. 4845 4846 Configuration changes 4847 4848 * All m68k and ColdFire targets now allow the default processor to be 4849 set at configure time using --with-cpu. 4850 * A --with-arch configuration option has been added. This option 4851 allows you to restrict a target to ColdFire or non-ColdFire 4852 processors. 4853 4854 Preprocessor macros 4855 4856 * An __mcfv*__ macro is now defined for all ColdFire targets. 4857 (Earlier versions of GCC only defined __mcfv4e__.) 4858 * __mcf_cpu_*, __mcf_family_* and __mcffpu__ macros have been added. 4859 * All targets now define __mc68010 and __mc68010__ when generating 4860 68010 code. 4861 4862 Command-line changes 4863 4864 * New command-line options -march, -mcpu, -mtune and -mhard-float 4865 have been added. These options apply to both m68k and ColdFire 4866 targets. 4867 * -mno-short, -mno-bitfield and -mno-rtd are now accepted as negative 4868 versions of -mshort, etc. 4869 * -fforce-addr has been removed. It is now ignored by the compiler. 4870 4871 Other improvements 4872 4873 * ColdFire targets now try to maintain a 4-byte-aligned stack where 4874 possible. 4875 * m68k-uclinux targets now try to avoid situations that lead to the 4876 load-time error: BINFMT_FLAT: reloc outside program. 4877 4878 MIPS 4879 4880 Changes to existing configurations 4881 4882 * libffi and libjava now support all three GNU/Linux ABIs: o32, n32 4883 and n64. Every GNU/Linux configuration now builds these libraries 4884 by default. 4885 * GNU/Linux configurations now generate -mno-shared code unless 4886 overridden by -fpic, -fPIC, -fpie or -fPIE. 4887 * mipsisa32*-linux-gnu configurations now generate hard-float code by 4888 default, just like other mipsisa32* and mips*-linux-gnu 4889 configurations. You can build a soft-float version of any 4890 mips*-linux-gnu configuration by passing --with-float=soft to 4891 configure. 4892 * mips-wrs-vxworks now supports run-time processes (RTPs). 4893 4894 Changes to existing command-line options 4895 4896 * The -march and -mtune options no longer accept 24k as a processor 4897 name. Please use 24kc, 24kf2_1 or 24kf1_1 instead. 4898 * The -march and -mtune options now accept 24kf2_1, 24kef2_1 and 4899 34kf2_1 as synonyms for 24kf, 24kef and 34kf respectively. The 4900 options also accept 24kf1_1, 24kef1_1 and 34kf1_1 as synonyms for 4901 24kx, 24kex and 34kx. 4902 4903 New configurations 4904 4905 GCC now supports the following configurations: 4906 * mipsisa32r2*-linux-gnu*, which generates MIPS32 revision 2 code by 4907 default. Earlier releases also recognized this configuration, but 4908 they treated it in the same way as mipsisa32*-linux-gnu*. Note that 4909 you can customize any mips*-linux-gnu* configuration to a 4910 particular ISA or processor by passing an appropriate --with-arch 4911 option to configure. 4912 * mipsisa*-sde-elf*, which provides compatibility with MIPS 4913 Technologies' SDE toolchains. The configuration uses the SDE 4914 libraries by default, but you can use it like other newlib-based 4915 ELF configurations by passing --with-newlib to configure. It is the 4916 only configuration besides mips64vr*-elf* to build MIPS16 as well 4917 as non-MIPS16 libraries. 4918 * mipsisa*-elfoabi*, which is similar to the general mipsisa*-elf* 4919 configuration, but uses the o32 and o64 ABIs instead of the 32-bit 4920 and 64-bit forms of the EABI. 4921 4922 New processors and application-specific extensions 4923 4924 * Support for the SmartMIPS ASE is available through the new 4925 -msmartmips option. 4926 * Support for revision 2 of the DSP ASE is available through the new 4927 -mdspr2 option. A new preprocessor macro called __mips_dsp_rev 4928 indicates the revision of the ASE in use. 4929 * Support for the 4KS and 74K families of processors is available 4930 through the -march and -mtune options. 4931 4932 Improved support for built-in functions 4933 4934 * GCC can now use load-linked, store-conditional and sync 4935 instructions to implement atomic built-in functions such as 4936 __sync_fetch_and_add. The memory reference must be 4 bytes wide for 4937 32-bit targets and either 4 or 8 bytes wide for 64-bit targets. 4938 * GCC can now use the clz and dclz instructions to implement the 4939 __builtin_ctz and __builtin_ffs families of functions. 4940 * There is a new __builtin___clear_cache function for flushing the 4941 instruction cache. GCC expands this function inline on MIPS32 4942 revision 2 targets, otherwise it calls the function specified by 4943 -mcache-flush-func. 4944 4945 MIPS16 improvements 4946 4947 * GCC can now compile objects that contain a mixture of MIPS16 and 4948 non-MIPS16 code. There are two new attributes, mips16 and nomips16, 4949 for specifying which mode a function should use. 4950 * A new option called -minterlink-mips16 makes non-MIPS16 code 4951 link-compatible with MIPS16 code. 4952 * After many bug fixes, the long-standing MIPS16 -mhard-float support 4953 should now work fairly reliably. 4954 * GCC can now use the MIPS16e save and restore instructions. 4955 * -fsection-anchors now works in MIPS16 mode. MIPS16 code compiled 4956 with -G0 -fsection-anchors is often smaller than code compiled with 4957 -G8. However, please note that you must usually compile all objects 4958 in your application with the same -G option; see the documentation 4959 of -G for details. 4960 * A new option called-mcode-readable specifies which instructions are 4961 allowed to load from the code segment. -mcode-readable=yes is the 4962 default and says that any instruction may load from the code 4963 segment. The other alternatives are -mcode-readable=pcrel, which 4964 says that only PC-relative MIPS16 instructions may load from the 4965 code segment, and -mcode-readable=no, which says that no 4966 instruction may do so. Please see the documentation for more 4967 details, including example uses. 4968 4969 Small-data improvements 4970 4971 There are three new options for controlling small data: 4972 * -mno-extern-sdata, which disables small-data accesses for 4973 externally-defined variables. Code compiled with -Gn 4974 -mno-extern-sdata will be link-compatible with any -G setting 4975 between -G0 and -Gn inclusive. 4976 * -mno-local-sdata, which disables the use of small-data sections for 4977 data that is not externally visible. This option can be a useful 4978 way of reducing small-data usage in less performance-critical parts 4979 of an application. 4980 * -mno-gpopt, which disables the use of the $gp register while still 4981 honoring the -G limit when placing externally-visible data. This 4982 option implies -mno-extern-sdata and -mno-local-sdata and it can be 4983 useful in situations where $gp does not necessarily hold the 4984 expected value. 4985 4986 Miscellaneous improvements 4987 4988 * There is a new option called -mbranch-cost for tweaking the 4989 perceived cost of branches. 4990 * If GCC is configured to use a version of GAS that supports the 4991 .gnu_attribute directive, it will use that directive to record 4992 certain properties of the output code. .gnu_attribute is new to GAS 4993 2.18. 4994 * There are two new function attributes, near and far, for overriding 4995 the command-line setting of -mlong-calls on a function-by-function 4996 basis. 4997 * -mfp64, which previously required a 64-bit target, now works with 4998 MIPS32 revision 2 targets as well. The mipsisa*-elfoabi* and 4999 mipsisa*-sde-elf* configurations provide suitable library support. 5000 * GCC now recognizes the -mdmx and -mmt options and passes them down 5001 to the assembler. It does nothing else with the options at present. 5002 5003 SPU (Synergistic Processor Unit) of the Cell Broadband Engine Architecture 5004 (BEA) 5005 5006 * Support has been added for this new architecture. 5007 5008 RS6000 (POWER/PowerPC) 5009 5010 * Support for the PowerPC 750CL paired-single instructions has been 5011 added with a new powerpc-*-linux*paired* target configuration. It 5012 is enabled by an associated -mpaired option and can be accessed 5013 using new built-in functions. 5014 * Support for auto-detecting architecture and system configuration to 5015 auto-select processor optimization tuning. 5016 * Support for VMX on AIX 5.3 has been added. 5017 * Support for AIX Version 6.1 has been added. 5018 5019 S/390, zSeries and System z9 5020 5021 * Support for the IBM System z9 EC/BC processor (z9 GA3) has been 5022 added. When using the -march=z9-ec option, the compiler will 5023 generate code making use of instructions provided by the decimal 5024 floating point facility and the floating point conversion facility 5025 (pfpo). Besides the instructions used to implement decimal floating 5026 point operations these facilities also contain instructions to move 5027 between general purpose and floating point registers and to modify 5028 and copy the sign-bit of floating point values. 5029 * When the -march=z9-ec option is used the new 5030 -mhard-dfp/-mno-hard-dfp options can be used to specify whether the 5031 decimal floating point hardware instructions will be used or not. 5032 If none of them is given the hardware support is enabled by 5033 default. 5034 * The -mstack-guard option can now be omitted when using stack 5035 checking via -mstack-size in order to let GCC choose a sensible 5036 stack guard value according to the frame size of each function. 5037 * Various changes to improve performance of generated code have been 5038 implemented, including: 5039 + The condition code set by an add logical with carry 5040 instruction is now available for overflow checks like: a + b + 5041 carry < b. 5042 + The test data class instruction is now used to implement 5043 sign-bit and infinity checks of binary and decimal floating 5044 point numbers. 5045 5046 SPARC 5047 5048 * Support for the Sun UltraSPARC T2 (Niagara 2) processor has been 5049 added. 5050 5051 Xtensa 5052 5053 * Stack unwinding for exception handling now uses by default a 5054 specialized version of DWARF unwinding. This is not 5055 binary-compatible with the setjmp/longjmp (sjlj) unwinding used for 5056 Xtensa with previous versions of GCC. 5057 * For Xtensa processors that include the Conditional Store option, 5058 the built-in functions for atomic memory access are now implemented 5059 using S32C1I instructions. 5060 * If the Xtensa NSA option is available, GCC will use it to implement 5061 the __builtin_ctz and __builtin_clz functions. 5062 5063 Documentation improvements 5064 5065 * Existing libstdc++ documentation has been edited and restructured 5066 into a single DocBook XML manual. The results can be viewed online 5067 [24]here. 5068 5069 Other significant improvements 5070 5071 * The compiler's --help command-line option has been extended so that 5072 it now takes an optional set of arguments. These arguments restrict 5073 the information displayed to specific classes of command-line 5074 options, and possibly only a subset of those options. It is also 5075 now possible to replace the descriptive text associated with each 5076 displayed option with an indication of its current value, or for 5077 binary options, whether it has been enabled or disabled. 5078 Here are some examples. The following will display all the options 5079 controlling warning messages: 5080 --help=warnings 5081 5082 Whereas this will display all the undocumented, target specific 5083 options: 5084 --help=target,undocumented 5085 5086 This sequence of commands will display the binary optimizations 5087 that are enabled by -O3: 5088 gcc -c -Q -O3 --help=optimizers > /tmp/O3-opts 5089 gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts 5090 diff /tmp/O2-opts /tmp/O3-opts | grep enabled 5091 5092 * The configure options --with-pkgversion and --with-bugurl have been 5093 added. These allow distributors of GCC to include a 5094 distributor-specific string in manuals and --version output and to 5095 specify the URL for reporting bugs in their versions of GCC. 5096 5097 GCC 4.3.1 5098 5099 This is the [25]list of problem reports (PRs) from GCC's bug tracking 5100 system that are known to be fixed in the 4.3.1 release. This list might 5101 not be complete (that is, it is possible that some PRs that have been 5102 fixed are not listed here). 5103 5104 Target Specific Changes 5105 5106 IA-32/x86-64 5107 5108 ABI changes 5109 5110 * Starting with GCC 4.3.1, decimal floating point variables are 5111 aligned to their natural boundaries when they are passed on the 5112 stack for i386. 5113 5114 Command-line changes 5115 5116 * Starting with GCC 4.3.1, the -mcld option has been added to 5117 automatically generate a cld instruction in the prologue of 5118 functions that use string instructions. This option is used for 5119 backward compatibility on some operating systems and can be enabled 5120 by default for 32-bit x86 targets by configuring GCC with the 5121 --enable-cld configure option. 5122 5123 GCC 4.3.2 5124 5125 This is the [26]list of problem reports (PRs) from GCC's bug tracking 5126 system that are known to be fixed in the 4.3.2 release. This list might 5127 not be complete (that is, it is possible that some PRs that have been 5128 fixed are not listed here). 5129 5130 GCC 4.3.3 5131 5132 This is the [27]list of problem reports (PRs) from GCC's bug tracking 5133 system that are known to be fixed in the 4.3.3 release. This list might 5134 not be complete (that is, it is possible that some PRs that have been 5135 fixed are not listed here). 5136 5137 GCC 4.3.4 5138 5139 This is the [28]list of problem reports (PRs) from GCC's bug tracking 5140 system that are known to be fixed in the 4.3.4 release. This list might 5141 not be complete (that is, it is possible that some PRs that have been 5142 fixed are not listed here). 5143 5144 GCC 4.3.5 5145 5146 This is the [29]list of problem reports (PRs) from GCC's bug tracking 5147 system that are known to be fixed in the 4.3.5 release. This list might 5148 not be complete (that is, it is possible that some PRs that have been 5149 fixed are not listed here). 5150 5151 GCC 4.3.6 5152 5153 This is the [30]list of problem reports (PRs) from GCC's bug tracking 5154 system that are known to be fixed in the 4.3.6 release. This list might 5155 not be complete (that is, it is possible that some PRs that have been 5156 fixed are not listed here). 5157 5158 5159 For questions related to the use of GCC, please consult these web 5160 pages and the [31]GCC manuals. If that fails, the 5161 [32]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5162 web pages and the development of GCC are welcome on our developer 5163 list at [33]gcc (a] gcc.gnu.org. All of [34]our lists have public 5164 archives. 5165 5166 Copyright (C) [35]Free Software Foundation, Inc. Verbatim copying and 5167 distribution of this entire article is permitted in any medium, 5168 provided this notice is preserved. 5169 5170 These pages are [36]maintained by the GCC team. Last modified 5171 2012-11-02[37]. 5172 5173 References 5174 5175 1. http://gcc.gnu.org/gcc-4.3/changes.html#4.3.5 5176 2. http://gmplib.org/ 5177 3. http://www.mpfr.org/ 5178 4. http://gcc.gnu.org/install/prerequisites.html 5179 5. http://gcc.gnu.org/ml/gcc-announce/2001/msg00000.html 5180 6. http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options 5181 7. http://gcc.gnu.org/gcc-4.3/porting_to.html 5182 8. http://www.mpfr.org/ 5183 9. http://www.mpfr.org/ 5184 10. http://www.mpfr.org/ 5185 11. http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html 5186 12. http://gcc.gnu.org/gcc-4.3/cxx0x_status.html 5187 13. http://gcc.gnu.org/gcc-4.3/cxx0x_status.html 5188 14. http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#m anual.intro.status.standard.tr1 5189 15. http://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode.html 5190 16. http://gmplib.org/ 5191 17. http://www.mpfr.org/ 5192 18. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#Code-Gen-Options 5193 19. http://gcc.gnu.org/onlinedocs/gfortran/Code-Gen-Options.html#index-g_t_0040code_007bfinit-local-zero_007d-167 5194 20. http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gfortran/GAMMA.html 5195 21. http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gfortran/LGAMMA.html 5196 22. http://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html 5197 23. http://gcc.gnu.org/onlinedocs/gfortran/BOZ-literal-constants.html 5198 24. http://gcc.gnu.org/onlinedocs/libstdc++/ 5199 25. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.1 5200 26. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.2 5201 27. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.3 5202 28. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.4 5203 29. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.5 5204 30. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.3.6 5205 31. http://gcc.gnu.org/onlinedocs/ 5206 32. mailto:gcc-help (a] gcc.gnu.org 5207 33. mailto:gcc (a] gcc.gnu.org 5208 34. http://gcc.gnu.org/lists.html 5209 35. http://www.fsf.org/ 5210 36. http://gcc.gnu.org/about.html 5211 37. http://validator.w3.org/check/referer 5212 ====================================================================== 5213 http://gcc.gnu.org/gcc-4.2/index.html 5214 5215 GCC 4.2 Release Series 5216 5217 May 19, 2008 5218 5219 The [1]GNU project and the GCC developers are pleased to announce the 5220 release of GCC 4.2.4. 5221 5222 This release is a bug-fix release, containing fixes for regressions in 5223 GCC 4.2.3 relative to previous releases of GCC. 5224 5225 Release History 5226 5227 GCC 4.2.4 5228 May 19, 2008 ([2]changes) 5229 5230 GCC 4.2.3 5231 February 1, 2008 ([3]changes) 5232 5233 GCC 4.2.2 5234 October 7, 2007 ([4]changes) 5235 5236 GCC 4.2.1 5237 July 18, 2007 ([5]changes) 5238 5239 GCC 4.2.0 5240 May 13, 2007 ([6]changes) 5241 5242 References and Acknowledgements 5243 5244 GCC used to stand for the GNU C Compiler, but since the compiler 5245 supports several other languages aside from C, it now stands for the 5246 GNU Compiler Collection. 5247 5248 A list of [7]successful builds is updated as new information becomes 5249 available. 5250 5251 The GCC developers would like to thank the numerous people that have 5252 contributed new features, improvements, bug fixes, and other changes as 5253 well as test results to GCC. This [8]amazing group of volunteers is 5254 what makes GCC successful. 5255 5256 For additional information about GCC please refer to the [9]GCC project 5257 web site or contact the [10]GCC development mailing list. 5258 5259 To obtain GCC please use [11]our mirror sites or [12]our SVN server. 5260 5261 5262 For questions related to the use of GCC, please consult these web 5263 pages and the [13]GCC manuals. If that fails, the 5264 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5265 web pages and the development of GCC are welcome on our developer 5266 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 5267 archives. 5268 5269 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 5270 distribution of this entire article is permitted in any medium, 5271 provided this notice is preserved. 5272 5273 These pages are [18]maintained by the GCC team. Last modified 5274 2012-11-02[19]. 5275 5276 References 5277 5278 1. http://www.gnu.org/ 5279 2. http://gcc.gnu.org/gcc-4.2/changes.html 5280 3. http://gcc.gnu.org/gcc-4.2/changes.html 5281 4. http://gcc.gnu.org/gcc-4.2/changes.html 5282 5. http://gcc.gnu.org/gcc-4.2/changes.html 5283 6. http://gcc.gnu.org/gcc-4.2/changes.html 5284 7. http://gcc.gnu.org/gcc-4.2/buildstat.html 5285 8. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 5286 9. http://gcc.gnu.org/index.html 5287 10. mailto:gcc (a] gcc.gnu.org 5288 11. http://gcc.gnu.org/mirrors.html 5289 12. http://gcc.gnu.org/svn.html 5290 13. http://gcc.gnu.org/onlinedocs/ 5291 14. mailto:gcc-help (a] gcc.gnu.org 5292 15. mailto:gcc (a] gcc.gnu.org 5293 16. http://gcc.gnu.org/lists.html 5294 17. http://www.fsf.org/ 5295 18. http://gcc.gnu.org/about.html 5296 19. http://validator.w3.org/check/referer 5297 ====================================================================== 5298 http://gcc.gnu.org/gcc-4.2/changes.html 5299 5300 GCC 4.2 Release Series 5301 Changes, New Features, and Fixes 5302 5303 Caveats 5304 5305 * GCC no longer accepts the -fshared-data option. This option has had 5306 no effect in any GCC 4 release; the targets to which the option 5307 used to apply had been removed before GCC 4.0. 5308 5309 General Optimizer Improvements 5310 5311 * New command-line options specify the possible relationships among 5312 parameters and between parameters and global data. For example, 5313 -fargument-noalias-anything specifies that arguments do not alias 5314 any other storage. 5315 Each language will automatically use whatever option is required by 5316 the language standard. You should not need to use these options 5317 yourself. 5318 5319 New Languages and Language specific improvements 5320 5321 * [1]OpenMP is now supported for the C, C++ and Fortran compilers. 5322 * New command-line options -fstrict-overflow and -Wstrict-overflow 5323 have been added. -fstrict-overflow tells the compiler that it may 5324 assume that the program follows the strict signed overflow 5325 semantics permitted for the language: for C and C++ this means that 5326 the compiler may assume that signed overflow does not occur. For 5327 example, a loop like 5328 for (i = 1; i > 0; i *= 2) 5329 5330 is presumably intended to continue looping until i overflows. With 5331 -fstrict-overflow, the compiler may assume that signed overflow 5332 will not occur, and transform this into an infinite loop. 5333 -fstrict-overflow is turned on by default at -O2, and may be 5334 disabled via -fno-strict-overflow. The -Wstrict-overflow option may 5335 be used to warn about cases where the compiler assumes that signed 5336 overflow will not occur. It takes five different levels: 5337 -Wstrict-overflow=1 to 5. See the [2]documentation for details. 5338 -Wstrict-overflow=1 is enabled by -Wall. 5339 * The new command-line option -fno-toplevel-reorder directs GCC to 5340 emit top-level functions, variables, and asm statements in the same 5341 order that they appear in the input file. This is intended to 5342 support existing code which relies on a particular ordering (for 5343 example, code which uses top-level asm statements to switch 5344 sections). For new code, it is generally better to use function and 5345 variable attributes. The -fno-toplevel-reorder option may be used 5346 for most cases which currently use -fno-unit-at-a-time. The 5347 -fno-unit-at-a-time option will be removed in some future version 5348 of GCC. If you know of a case which requires -fno-unit-at-a-time 5349 which is not fixed by -fno-toplevel-reorder, please open a bug 5350 report. 5351 5352 C family 5353 5354 * The pragma redefine_extname will now macro expand its tokens for 5355 compatibility with SunPRO. 5356 * In the next release of GCC, 4.3, -std=c99 or -std=gnu99 will direct 5357 GCC to handle inline functions as specified in the C99 standard. In 5358 preparation for this, GCC 4.2 will warn about any use of non-static 5359 inline functions in gnu99 or c99 mode. This new warning may be 5360 disabled with the new gnu_inline function attribute or the new 5361 -fgnu89-inline command-line option. Also, GCC 4.2 and later will 5362 define one of the preprocessor macros __GNUC_GNU_INLINE__ or 5363 __GNUC_STDC_INLINE__ to indicate the semantics of inline functions 5364 in the current compilation. 5365 * A new command-line option -Waddress has been added to warn about 5366 suspicious uses of memory addresses as, for example, using the 5367 address of a function in a conditional expression, and comparisons 5368 against the memory address of a string literal. This warning is 5369 enabled by -Wall. 5370 5371 C++ 5372 5373 * C++ visibility handling has been overhauled. 5374 Restricted visiblity is propagated from classes to members, from 5375 functions to local statics, and from templates and template 5376 arguments to instantiations, unless the latter has explicitly 5377 declared visibility. 5378 The visibility attribute for a class must come between the 5379 class-key and the name, not after the closing brace. 5380 Attributes are now allowed for enums and elaborated-type-specifiers 5381 that only declare a type. 5382 Members of the anonymous namespace are now local to a particular 5383 translation unit, along with any other declarations which use them, 5384 though they are still treated as having external linkage for 5385 language semantics. 5386 * The (undocumented) extension which permitted templates with default 5387 arguments to be bound to template template parameters with fewer 5388 parameters has been removed. For example: 5389 template <template <typename> class C> 5390 void f(C<double>) {} 5391 5392 template <typename T, typename U = int> 5393 struct S {}; 5394 5395 template void f(S<double>); 5396 5397 is no longer accepted by G++. The reason this code is not accepted 5398 is that S is a template with two parameters; therefore, it cannot 5399 be bound to C which has only one parameter. 5400 * The <?, >?, <?=, and >?= operators, deprecated in previous GCC 5401 releases, have been removed. 5402 * The command-line option -fconst-strings, deprecated in previous GCC 5403 releases, has been removed. 5404 * The configure variable enable-__cxa_atexit is now enabled by 5405 default for more targets. Enabling this variable is necessary in 5406 order for static destructors to be executed in the correct order, 5407 but it depends upon the presence of a non-standard C library in the 5408 target library in order to work. The variable is now enabled for 5409 more targets which are known to have suitable C libraries. 5410 * -Wextra will produce warnings for if statements with a semicolon as 5411 the only body, to catch code like: 5412 if (a); 5413 return 1; 5414 return 0; 5415 5416 To suppress the warning in valid cases, use { } instead. 5417 * The C++ frontend now also produces strict aliasing warnings when 5418 -fstrict-aliasing -Wstrict-aliasing is in effect. 5419 5420 Runtime Library (libstdc++) 5421 5422 * Added support for TR1 <random>, <complex>, and C compatibility 5423 headers. In addition, a lock-free version of shared_ptr was 5424 contributed as part of Phillip Jordan's Google Summer of Code 5425 project on lock-free containers. ([3]Implementation status of TR1) 5426 * In association with the Summer of Code work on lock-free 5427 containers, the interface for atomic builtins was adjusted, 5428 creating simpler alternatives for non-threaded code paths. Also, 5429 usage was consolidated and all elements were moved from namespace 5430 std to namespace__gnu_cxx. Affected interfaces are the functions 5431 __exchange_and_add, __atomic_add, and the objects __mutex, 5432 __recursive_mutex, and __scoped_lock. 5433 * Support for versioning weak symbol names via namespace association 5434 was added. However, as this changes the names of exported symbols, 5435 this is turned off by default in the current ABI. Intrepid users 5436 can enable this feature by using 5437 --enable-symvers=gnu-versioned-namespace during configuration. 5438 * Revised, simplified, and expanded policy-based associative 5439 containers, including data types for tree and trie forms 5440 (basic_tree, tree, trie), lists (list_update), and both 5441 collision-chaining and probing hash-based containers 5442 (basic_hash_table, cc_hash_table, gp_hash_table). More details per 5443 the [4]documentation. 5444 * The implementation of the debug mode was modified, whereby the 5445 debug namespaces were nested inside of namespace std and namespace 5446 __gnu_cxx in order to resolve some long standing corner cases 5447 involving name lookup. Debug functionality from the policy-based 5448 data structures was consolidated and enabled with the single macro, 5449 _GLIBCXX_DEBUG. See PR 26142 for more information. 5450 * Added extensions for type traits: __conditional_type, 5451 __numeric_traits, __add_unsigned, __removed_unsigned, __enable_if. 5452 * Added a typelist implementation for compile-time meta-programming. 5453 Elements for typelist construction and operation can be found 5454 within namespace __gnu_cxx::typelist. 5455 * Added a new allocator, __gnu_cxx::throw_allocator, for testing 5456 exception-safety. 5457 * Enabled library-wide visibility control, allowing -fvisibility to 5458 be used. 5459 * Consolidated all nested namespaces and the conversion of 5460 __gnu_internal implementation-private details to anonymous 5461 namespaces whenever possible. 5462 * Implemented LWG resolutions DR 431 and DR 538. 5463 5464 Fortran 5465 5466 * Support for allocatable components has been added (TR 15581 and 5467 Fortran 2003). 5468 * Support for the Fortran 2003 streaming IO extension has been added. 5469 * The GNU Fortran compiler now uses 4-byte record markers by default 5470 for unformatted files to be compatible with g77 and most other 5471 compilers. The implementation allows for records greater than 2 GB 5472 and is compatible with several other compilers. Older versions of 5473 gfortran used 8-byte record markers by default (on most systems). 5474 In order to change the length of the record markers, e.g. to read 5475 unformatted files created by older gfortran versions, the 5476 [5]-frecord-marker=8 option can be used. 5477 5478 Java (GCJ) 5479 5480 * A new command-line option -static-libgcj has been added for targets 5481 that use a linker compatible with GNU Binutils. As its name 5482 implies, this causes libgcj to be linked statically. In some cases 5483 this causes the resulting executable to start faster and use less 5484 memory than if the shared version of libgcj were used. However 5485 caution should be used as it can also cause essential parts of the 5486 library to be omitted. Some of these issues are discussed in: 5487 [6]http://gcc.gnu.org/wiki/Statically_linking_libgcj 5488 * fastjar is no longer bundled with GCC. To build libgcj, you will 5489 need either InfoZIP (both zip and unzip) or an external jar 5490 program. In the former case, the GCC build will install a jar shell 5491 script that is based on InfoZIP and provides the same functionality 5492 as fastjar. 5493 5494 New Targets and Target Specific Improvements 5495 5496 IA-32/x86-64 5497 5498 * -mtune=generic can now be used to generate code running well on 5499 common x86 chips. This includes AMD Athlon, AMD Opteron, Intel 5500 Pentium-M, Intel Pentium 4 and Intel Core 2. 5501 * -mtune=native and -march=native will produce code optimized for the 5502 host architecture as detected using the cpuid instruction. 5503 * Added a new command-line option -fstackrealign and and 5504 __attribute__ ((force_align_arg_pointer)) to realign the stack at 5505 runtime. This allows functions compiled with a vector-aligned stack 5506 to be invoked from legacy objects that keep only word-alignment. 5507 5508 SPARC 5509 5510 * The default CPU setting has been changed from V7 to V9 in 32-bit 5511 mode on Solaris 7 and above. This is already the case in 64-bit 5512 mode. It can be overridden by specifying --with-cpu at configure 5513 time. 5514 * Back-end support of built-in functions for atomic memory access has 5515 been implemented. 5516 * Support for the Sun UltraSPARC T1 (Niagara) processor has been 5517 added. 5518 5519 M32C 5520 5521 * Various bug fixes have made some functions (notably, functions 5522 returning structures) incompatible with previous releases. 5523 Recompiling all libraries is recommended. Note that code quality 5524 has considerably improved since 4.1, making a recompile even more 5525 beneficial. 5526 5527 MIPS 5528 5529 * Added support for the Broadcom SB-1A core. 5530 5531 IA-64 5532 5533 * Added support for IA-64 data and control speculation. By default 5534 speculation is enabled only during second scheduler pass. A number 5535 of machine flags was introduced to control the usage of speculation 5536 for both scheduler passes. 5537 5538 HPPA 5539 5540 * Added Java language support (libffi and libjava) for 32-bit HP-UX 5541 11 target. 5542 5543 Obsolete Systems 5544 5545 Documentation improvements 5546 5547 PDF Documentation 5548 5549 * A make pdf target has been added to the top-level makefile, 5550 enabling automated production of PDF documentation files. 5551 (Front-ends external to GCC should modify their Make-lang.in file 5552 to add a lang.pdf: target.) 5553 5554 Other significant improvements 5555 5556 Build system improvements 5557 5558 * All the components of the compiler are now bootstrapped by default. 5559 This improves the resilience to bugs in the system compiler or 5560 binary compatibility problems, as well as providing better testing 5561 of GCC 4.2 itself. In addition, if you build the compiler from a 5562 combined tree, the assembler, linker, etc. will also be 5563 bootstrapped (i.e. built with themselves). 5564 You can disable this behavior, and go back to the pre-GCC 4.2 set 5565 up, by configuring GCC with --disable-bootstrap. 5566 * The rules that configure follows to find target tools resemble more 5567 closely the locations that the built compiler will search. In 5568 addition, you can use the new configure option --with-target-tools 5569 to specify where to find the target tools used during the build, 5570 without affecting what the built compiler will use. 5571 This can be especially useful when building packages of GCC. For 5572 example, you may want to build GCC with GNU as or ld, even if the 5573 resulting compiler to work with the native assembler and linker. To 5574 do so, you can use --with-target-tools to point to the native 5575 tools. 5576 5577 Incompatible changes to the build system 5578 5579 * Front-ends external to GCC should modify their Make-lang.in file to 5580 replace double-colon rules (e.g. dvi::) with normal rules (like 5581 lang.dvi:). Front-end makefile hooks do not use double-colon rules 5582 anymore. 5583 * Up to GCC 4.1, a popular way to specify the target tools used 5584 during the build was to create directories named gas, binutils, 5585 etc. in the build tree, and create links to the tools from there. 5586 This does not work any more when the compiler is bootstrapped. The 5587 new configure option --with-target-tools provides a better way to 5588 achieve the same effect, and works for all native and cross 5589 settings. 5590 5591 5592 For questions related to the use of GCC, please consult these web 5593 pages and the [7]GCC manuals. If that fails, the 5594 [8]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5595 web pages and the development of GCC are welcome on our developer 5596 list at [9]gcc (a] gcc.gnu.org. All of [10]our lists have public 5597 archives. 5598 5599 Copyright (C) [11]Free Software Foundation, Inc. Verbatim copying and 5600 distribution of this entire article is permitted in any medium, 5601 provided this notice is preserved. 5602 5603 These pages are [12]maintained by the GCC team. Last modified 5604 2012-11-02[13]. 5605 5606 References 5607 5608 1. http://gcc.gnu.org/projects/gomp/ 5609 2. http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html 5610 3. http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#manual.intro.status.standard.tr1 5611 4. http://gcc.gnu.org/onlinedocs/libstdc++/ext/pb_ds/index.html 5612 5. http://gcc.gnu.org/onlinedocs/gfortran/Runtime-Options.html 5613 6. http://gcc.gnu.org/wiki/Statically_linking_libgcj 5614 7. http://gcc.gnu.org/onlinedocs/ 5615 8. mailto:gcc-help (a] gcc.gnu.org 5616 9. mailto:gcc (a] gcc.gnu.org 5617 10. http://gcc.gnu.org/lists.html 5618 11. http://www.fsf.org/ 5619 12. http://gcc.gnu.org/about.html 5620 13. http://validator.w3.org/check/referer 5621 ====================================================================== 5622 http://gcc.gnu.org/gcc-4.1/index.html 5623 5624 GCC 4.1 Release Series 5625 5626 February 13, 2007 5627 5628 The [1]GNU project and the GCC developers are pleased to announce the 5629 release of GCC 4.1.2. 5630 5631 This release is a bug-fix release, containing fixes for regressions in 5632 GCC 4.1.1 relative to previous releases of GCC. 5633 5634 Release History 5635 5636 GCC 4.1.2 5637 February 13, 2007 ([2]changes) 5638 5639 GCC 4.1.1 5640 May 24, 2006 ([3]changes) 5641 5642 GCC 4.1.0 5643 February 28, 2006 ([4]changes) 5644 5645 References and Acknowledgements 5646 5647 GCC used to stand for the GNU C Compiler, but since the compiler 5648 supports several other languages aside from C, it now stands for the 5649 GNU Compiler Collection. 5650 5651 A list of [5]successful builds is updated as new information becomes 5652 available. 5653 5654 The GCC developers would like to thank the numerous people that have 5655 contributed new features, improvements, bug fixes, and other changes as 5656 well as test results to GCC. This [6]amazing group of volunteers is 5657 what makes GCC successful. 5658 5659 For additional information about GCC please refer to the [7]GCC project 5660 web site or contact the [8]GCC development mailing list. 5661 5662 To obtain GCC please use [9]our mirror sites or [10]our SVN server. 5663 5664 5665 For questions related to the use of GCC, please consult these web 5666 pages and the [11]GCC manuals. If that fails, the 5667 [12]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 5668 web pages and the development of GCC are welcome on our developer 5669 list at [13]gcc (a] gcc.gnu.org. All of [14]our lists have public 5670 archives. 5671 5672 Copyright (C) [15]Free Software Foundation, Inc. Verbatim copying and 5673 distribution of this entire article is permitted in any medium, 5674 provided this notice is preserved. 5675 5676 These pages are [16]maintained by the GCC team. Last modified 5677 2012-11-02[17]. 5678 5679 References 5680 5681 1. http://www.gnu.org/ 5682 2. http://gcc.gnu.org/gcc-4.1/changes.html#4.1.2 5683 3. http://gcc.gnu.org/gcc-4.1/changes.html 5684 4. http://gcc.gnu.org/gcc-4.1/changes.html 5685 5. http://gcc.gnu.org/gcc-4.1/buildstat.html 5686 6. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 5687 7. http://gcc.gnu.org/index.html 5688 8. mailto:gcc (a] gcc.gnu.org 5689 9. http://gcc.gnu.org/mirrors.html 5690 10. http://gcc.gnu.org/svn.html 5691 11. http://gcc.gnu.org/onlinedocs/ 5692 12. mailto:gcc-help (a] gcc.gnu.org 5693 13. mailto:gcc (a] gcc.gnu.org 5694 14. http://gcc.gnu.org/lists.html 5695 15. http://www.fsf.org/ 5696 16. http://gcc.gnu.org/about.html 5697 17. http://validator.w3.org/check/referer 5698 ====================================================================== 5699 http://gcc.gnu.org/gcc-4.1/changes.html 5700 5701 GCC 4.1 Release Series 5702 Changes, New Features, and Fixes 5703 5704 The latest release in the 4.1 release series is [1]GCC 4.1.2. 5705 5706 Caveats 5707 5708 General Optimizer Improvements 5709 5710 * GCC now has infrastructure for inter-procedural optimizations and 5711 the following inter-procedural optimizations are implemented: 5712 + Profile guided inlining. When doing profile feedback guided 5713 optimization, GCC can now use the profile to make better 5714 informed decisions on whether inlining of a function is 5715 profitable or not. This means that GCC will no longer inline 5716 functions at call sites that are not executed very often, and 5717 that functions at hot call sites are more likely to be 5718 inlined. 5719 A new parameter min-inline-recursive-probability is also now 5720 available to throttle recursive inlining of functions with 5721 small average recursive depths. 5722 + Discovery of pure and const functions, a form of side-effects 5723 analysis. While older GCC releases could also discover such 5724 special functions, the new IPA-based pass runs earlier so that 5725 the results are available to more optimizers. The pass is also 5726 simply more powerful than the old one. 5727 + Analysis of references to static variables and type escape 5728 analysis, also forms of side-effects analysis. The results of 5729 these passes allow the compiler to be less conservative about 5730 call-clobbered variables and references. This results in more 5731 redundant loads being eliminated and in making static 5732 variables candidates for register promotion. 5733 + Improvement of RTL-based alias analysis. The results of type 5734 escape analysis are fed to the RTL type-based alias analyzer, 5735 allowing it to disambiguate more memory references. 5736 + Interprocedural constant propagation and function versioning. 5737 This pass looks for functions that are always called with the 5738 same constant value for one or more of the function arguments, 5739 and propagates those constants into those functions. 5740 + GCC will now eliminate static variables whose usage was 5741 optimized out. 5742 + -fwhole-program --combine can now be used to make all 5743 functions in program static allowing whole program 5744 optimization. As an exception, the main function and all 5745 functions marked with the new externally_visible attribute are 5746 kept global so that programs can link with runtime libraries. 5747 * GCC can now do a form of partial dead code elimination (PDCE) that 5748 allows code motion of expressions to the paths where the result of 5749 the expression is actually needed. This is not always a win, so the 5750 pass has been limited to only consider profitable cases. Here is an 5751 example: 5752 int foo (int *, int *); 5753 int 5754 bar (int d) 5755 { 5756 int a, b, c; 5757 b = d + 1; 5758 c = d + 2; 5759 a = b + c; 5760 if (d) 5761 { 5762 foo (&b, &c); 5763 a = b + c; 5764 } 5765 printf ("%d\n", a); 5766 } 5767 5768 The a = b + c can be sunk to right before the printf. Normal code 5769 sinking will not do this, it will sink the first one above into the 5770 else-branch of the conditional jump, which still gives you two 5771 copies of the code. 5772 * GCC now has a value range propagation pass. This allows the 5773 compiler to eliminate bounds checks and branches. The results of 5774 the pass can also be used to accurately compute branch 5775 probabilities. 5776 * The pass to convert PHI nodes to straight-line code (a form of 5777 if-conversion for GIMPLE) has been improved significantly. The two 5778 most significant improvements are an improved algorithm to 5779 determine the order in which the PHI nodes are considered, and an 5780 improvement that allow the pass to consider if-conversions of basic 5781 blocks with more than two predecessors. 5782 * Alias analysis improvements. GCC can now differentiate between 5783 different fields of structures in Tree-SSA's virtual operands form. 5784 This lets stores/loads from non-overlapping structure fields not 5785 conflict. A new algorithm to compute points-to sets was contributed 5786 that can allows GCC to see now that p->a and p->b, where p is a 5787 pointer to a structure, can never point to the same field. 5788 * Various enhancements to auto-vectorization: 5789 + Incrementally preserve SSA form when vectorizing. 5790 + Incrementally preserve loop-closed form when vectorizing. 5791 + Improvements to peeling for alignment: generate better code 5792 when the misalignment of an access is known at compile time, 5793 or when different accesses are known to have the same 5794 misalignment, even if the misalignment amount itself is 5795 unknown. 5796 + Consider dependence distance in the vectorizer. 5797 + Externalize generic parts of data reference analysis to make 5798 this analysis available to other passes. 5799 + Vectorization of conditional code. 5800 + Reduction support. 5801 * GCC can now partition functions in sections of hot and cold code. 5802 This can significantly improve performance due to better 5803 instruction cache locality. This feature works best together with 5804 profile feedback driven optimization. 5805 * A new pass to avoid saving of unneeded arguments to the stack in 5806 vararg functions if the compiler can prove that they will not be 5807 needed. 5808 * Transition of basic block profiling to tree level implementation 5809 has been completed. The new implementation should be considerably 5810 more reliable (hopefully avoiding profile mismatch errors when 5811 using -fprofile-use or -fbranch-probabilities) and can be used to 5812 drive higher level optimizations, such as inlining. 5813 The -ftree-based-profiling command-line option was removed and 5814 -fprofile-use now implies disabling old RTL level loop optimizer 5815 (-fno-loop-optimize). Speculative prefetching optimization 5816 (originally enabled by -fspeculative-prefetching) was removed. 5817 5818 New Languages and Language specific improvements 5819 5820 C and Objective-C 5821 5822 * The old Bison-based C and Objective-C parser has been replaced by a 5823 new, faster hand-written recursive-descent parser. 5824 5825 Ada 5826 5827 * The build infrastructure for the Ada runtime library and tools has 5828 been changed to be better integrated with the rest of the build 5829 infrastructure of GCC. This should make doing cross builds of Ada a 5830 bit easier. 5831 5832 C++ 5833 5834 * ARM-style name-injection of friend declarations is no longer the 5835 default. For example: 5836 struct S { 5837 friend void f(); 5838 }; 5839 5840 void g() { f(); } 5841 will not be accepted; instead a declaration of f will need to be 5842 present outside of the scope of S. The new -ffriend-injection 5843 option will enable the old behavior. 5844 * The (undocumented) extension which permitted templates with default 5845 arguments to be bound to template template parameters with fewer 5846 parameters has been deprecated, and will be removed in the next 5847 major release of G++. For example: 5848 template <template <typename> class C> 5849 void f(C<double>) {} 5850 5851 template <typename T, typename U = int> 5852 struct S {}; 5853 5854 template void f(S<double>); 5855 5856 makes use of the deprecated extension. The reason this code is not 5857 valid ISO C++ is that S is a template with two parameters; 5858 therefore, it cannot be bound to C which has only one parameter. 5859 5860 Runtime Library (libstdc++) 5861 5862 * Optimization work: 5863 + A new implementation of std::search_n is provided, better 5864 performing in case of random access iterators. 5865 + Added further efficient specializations of istream functions, 5866 i.e., character array and string extractors. 5867 + Other smaller improvements throughout. 5868 * Policy-based associative containers, designed for high-performance, 5869 flexibility and semantic safety are delivered in ext/pb_assoc. 5870 * A versatile string class, __gnu_cxx::__versa_string, providing 5871 facilities conforming to the standard requirements for 5872 basic_string, is delivered in <ext/vstring.h>. In particular: 5873 + Two base classes are provided: the default one avoids 5874 reference counting and is optimized for short strings; the 5875 alternate one, still uses it while improving in a few low 5876 level areas (e.g., alignment). See vstring_fwd.h for some 5877 useful typedefs. 5878 + Various algorithms have been rewritten (e.g., replace), the 5879 code streamlined and simple optimizations added. 5880 + Option 3 of DR 431 is implemented for both available bases, 5881 thus improving the support for stateful allocators. 5882 * As usual, many bugs have been fixed (e.g., libstdc++/13583, 5883 libstdc++/23953) and LWG resolutions put into effect for the first 5884 time (e.g., DR 280, DR 464, N1780 recommendations for DR 233, TR1 5885 Issue 6.19). The implementation status of TR1 is now tracked in the 5886 docs in tr1.html. 5887 5888 Objective-C++ 5889 5890 * A new language front end for Objective-C++ has been added. This 5891 language allows users to mix the object oriented features of 5892 Objective-C with those of C++. 5893 5894 Java (GCJ) 5895 5896 * Core library (libgcj) updates based on GNU Classpath 0.15 - 0.19 5897 features (plus some 0.20 bug-fixes) 5898 + Networking 5899 o The java.net.HttpURLConnection implementation no longer 5900 buffers the entire response body in memory. This means 5901 that response bodies larger than available memory can now 5902 be handled. 5903 + (N)IO 5904 o NIO FileChannel.map implementation, fast bulk put 5905 implementation for DirectByteBuffer (speeds up this 5906 method 10x). 5907 o FileChannel.lock() and FileChannel.force() implemented. 5908 + XML 5909 o gnu.xml fix for nodes created outside a namespace 5910 context. 5911 o Add support for output indenting and 5912 cdata-section-elements output instruction in 5913 xml.transform. 5914 o xml.xpath corrections for cases where elements/attributes 5915 might have been created in non-namespace-aware mode. 5916 Corrections to handling of XSL variables and minor 5917 conformance updates. 5918 + AWT 5919 o GNU JAWT implementation, the AWT Native Interface, which 5920 allows direct access to native screen resources from 5921 within a Canvas's paint method. GNU Classpath Examples 5922 comes with a Demo, see libjava/classpath/examples/README. 5923 o awt.datatransfer updated to 1.5 with support for 5924 FlavorEvents. The gtk+ awt peers now allow copy/paste of 5925 text, images, URIs/files and serialized objects with 5926 other applications and tracking clipboard change events 5927 with gtk+ 2.6 (for gtk+ 2.4 only text and serialized 5928 objects are supported). A GNU Classpath Examples 5929 datatransfer Demo was added to show the new 5930 functionality. 5931 o Split gtk+ awt peers event handling in two threads and 5932 improve gdk lock handling (solves several awt lock ups). 5933 o Speed up awt Image loading. 5934 o Better gtk+ scrollbar peer implementation when using gtk+ 5935 >= 2.6. 5936 o Handle image loading errors correctly for gdkpixbuf and 5937 MediaTracker. 5938 o Better handle GDK lock. Properly prefix gtkpeer native 5939 functions (cp_gtk). 5940 o GdkGraphics2D has been updated to use Cairo 0.5.x or 5941 higher. 5942 o BufferedImage and GtkImage rewrites. All image drawing 5943 operations should now work correctly (flipping requires 5944 gtk+ >= 2.6) 5945 o Future Graphics2D, image and text work is documented at: 5946 [2]http://developer.classpath.org/mediation/ClasspathGrap 5947 hicsImagesText 5948 o When gtk+ 2.6 or higher is installed the default log 5949 handler will produce stack traces whenever a WARNING, 5950 CRITICAL or ERROR message is produced. 5951 + Free Swing 5952 o The RepaintManager has been reworked for more efficient 5953 painting, especially for large GUIs. 5954 o The layout manager OverlayLayout has been implemented, 5955 the BoxLayout has been rewritten to make use of the 5956 SizeRequirements utility class and caching for more 5957 efficient layout. 5958 o Improved accessibility support. 5959 o Significant progress has been made in the implementation 5960 of the javax.swing.plaf.metal package, with most UI 5961 delegates in a working state now. Please test this with 5962 your own applications and provide feedback that will help 5963 us to improve this package. 5964 o The GUI demo (gnu.classpath.examples.swing.Demo) has been 5965 extended to highlight various features in our Free Swing 5966 implementation. And it includes a look and feel switcher 5967 for Metal (default), Ocean and GNU themes. 5968 o The javax.swing.plaf.multi package is now implemented. 5969 o Editing and several key actions for JTree and JTable were 5970 implemented. 5971 o Lots of icons and look and feel improvements for Free 5972 Swing basic and metal themes were added. Try running the 5973 GNU Classpath Swing Demo in examples 5974 (gnu.classpath.examples.swing.Demo) with: 5975 -Dswing.defaultlaf=javax.swing.plaf.basic.BasicLookAndFee 5976 l or 5977 -Dswing.defaultlaf=javax.swing.plaf.metal.MetalLookAndFee 5978 l 5979 o Start of styled text capabilites for java.swing.text. 5980 o DefaultMutableTreeNode pre-order, post-order, depth-first 5981 and breadth-first traversal enumerations implemented. 5982 o JInternalFrame colors and titlebar draw properly. 5983 o JTree is working up to par (icons, selection and keyboard 5984 traversal). 5985 o JMenus were made more compatible in visual and 5986 programmatic behavior. 5987 o JTable changeSelection and multiple selections 5988 implemented. 5989 o JButton and JToggleButton change states work properly 5990 now. 5991 o JFileChooser fixes. 5992 o revalidate() and repaint() fixes which make Free Swing 5993 much more responsive. 5994 o MetalIconFactory implemented. 5995 o Free Swing Top-Level Compatibility. JFrame, JDialog, 5996 JApplet, JInternalFrame, and JWindow are now 1.5 5997 compatible in the sense that you can call add() and 5998 setLayout() directly on them, which will have the same 5999 effect as calling getContentPane().add() and 6000 getContentPane().setLayout(). 6001 o The JTree interface has been completed. JTrees now 6002 recognizes mouse clicks and selections work. 6003 o BoxLayout works properly now. 6004 o Fixed GrayFilter to actually work. 6005 o Metal SplitPane implemented. 6006 o Lots of Free Swing text and editor stuff work now. 6007 + Free RMI and Corba 6008 o Andrew Watson, Vice President and Technical Director of 6009 the Object Management Group, has officially assigned us 6010 20 bit Vendor Minor Code Id: 0x47430 ("GC") that will 6011 mark remote classpath-specific system exceptions. 6012 Obtaining the VMCID means that GNU Classpath now is a 6013 recogniseable type of node in a highly interoperable 6014 CORBA world. 6015 o GNU Classpath now includes the first working draft to 6016 support the RMI over IIOP protocol. The current 6017 implementation is capable of remote invocations, 6018 transferring various Serializables and Externalizables 6019 via RMI-IIOP protocol. It can flatten graphs and, at 6020 least for the simple cases, is interoperable with 1.5 6021 JDKs. 6022 o org.omg.PortableInterceptor and related functionality in 6023 other packages is now implemented: 6024 # The sever and client interceptors work as required 6025 since 1.4. 6026 # The IOR interceptor works as needed for 1.5. 6027 o The org.omg.DynamicAny package is completed and passes 6028 the prepared tests. 6029 o The Portable Object Adapter should now support the output 6030 of the recent IDL to java compilers. These compilers now 6031 generate servants and not CORBA objects as before, making 6032 the output depend on the existing POA implementation. 6033 Completing POA means that such code can already be tried 6034 to run on Classpath. Our POA is tested for the following 6035 usager scenarios: 6036 # POA converts servant to the CORBA object. 6037 # Servant provides to the CORBA object. 6038 # POA activates new CORBA object with the given Object 6039 Id (byte array) that is later accessible for the 6040 servant. 6041 # During the first call, the ServantActivator provides 6042 servant for this and all subsequent calls on the 6043 current object. 6044 # During each call, the ServantLocator provides 6045 servant for this call only. 6046 # ServantLocator or ServantActivator forwards call to 6047 another server. 6048 # POA has a single servant, responsible for all 6049 objects. 6050 # POA has a default servant, but some objects are 6051 explicitly connected to they specific servants. 6052 The POA is verified using tests from the former 6053 cost.omg.org. 6054 o The CORBA implementation is now a working prototype that 6055 should support features up to 1.3 inclusive. We invite 6056 groups writing CORBA dependent applications to try 6057 Classpath implementation, reporting any possible bugs. 6058 The CORBA prototype is interoperable with Sun's 6059 implementation v 1.4, transferring object references, 6060 primitive types, narrow and wide strings, arrays, 6061 structures, trees, abstract interfaces and value types 6062 (feature of CORBA 2.3) between these two platforms. 6063 Remote exceptions are transferred and handled correctly. 6064 The stringified object references (IORs) from various 6065 sources are parsed as required. The transient (for 6066 current session) and permanent (till jre restart) 6067 redirections work. Both Little and Big Endian encoded 6068 messages are accepted. The implementation is verified 6069 using tests from the former cost.omg.org. The current 6070 release includes working examples (see the examples 6071 directory), demonstrating the client-server 6072 communication, using either CORBA Request or IDL-based 6073 stub (usually generated by a IDL to java compiler). These 6074 examples also show how to use the Classpath CORBA naming 6075 service. The IDL to java compiler is not yet written, but 6076 as our library must be compatible, it naturally accepts 6077 the output of other idlj implementations. 6078 + Misc 6079 o Updated TimeZone data against Olson tzdata2005l. 6080 o Make zip and jar packages UTF-8 clean. 6081 o "native" code builds and compiles (warning free) on 6082 Darwin and Solaris. 6083 o java.util.logging.FileHandler now rotates files. 6084 o Start of a generic JDWP framework in gnu/classpath/jdwp. 6085 This is unfinished, but feedback (at classpath (a] gnu.org) 6086 from runtime hackers is greatly appreciated. Although 6087 most of the work is currently being done around gcj/gij 6088 we want this framework to be as VM neutral as possible. 6089 Early design is described in: 6090 [3]http://gcc.gnu.org/ml/java/2005-05/msg00260.html 6091 o QT4 AWT peers, enable by giving configure 6092 --enable-qt-peer. Included, but not ready for production 6093 yet. They are explicitly disabled and not supported. But 6094 if you want to help with the development of these new 6095 features we are interested in feedback. You will have to 6096 explicitly enable them to try them out (and they will 6097 most likely contain bugs). 6098 o Documentation fixes all over the place. See 6099 [4]http://developer.classpath.org/doc/ 6100 6101 New Targets and Target Specific Improvements 6102 6103 IA-32/x86-64 6104 6105 * The x86-64 medium model (that allows building applications whose 6106 data segment exceeds 4GB) was redesigned to match latest ABI draft. 6107 New implementation split large datastructures into separate segment 6108 improving performance of accesses to small datastructures and also 6109 allows linking of small model libraries into medium model programs 6110 as long as the libraries are not accessing the large datastructures 6111 directly. Medium model is also supported in position independent 6112 code now. 6113 The ABI change results in partial incompatibility among medium 6114 model objects. Linking medium model libraries (or objects) compiled 6115 with new compiler into medium model program compiled with older 6116 will likely result in exceeding ranges of relocations. 6117 Binutils 2.16.91 or newer are required for compiling medium model 6118 now. 6119 6120 RS6000 (POWER/PowerPC) 6121 6122 * The AltiVec vector primitives in <altivec.h> are now implemented in 6123 a way that puts a smaller burden on the preprocessor, instead 6124 processing the "overloading" in the front ends. This should benefit 6125 compilation speed on AltiVec vector code. 6126 * AltiVec initializers now are generated more efficiently. 6127 * The popcountb instruction available on POWER5 now is generated. 6128 * The floating point round to integer instructions available on 6129 POWER5+ now is generated. 6130 * Floating point divides can be synthesized using the floating point 6131 reciprocal estimate instructions. 6132 * Double precision floating point constants are initialized as single 6133 precision values if they can be represented exactly. 6134 6135 S/390, zSeries and System z9 6136 6137 * Support for the IBM System z9 109 processor has been added. When 6138 using the -march=z9-109 option, the compiler will generate code 6139 making use of instructions provided by the extended immediate 6140 facility. 6141 * Support for 128-bit IEEE floating point has been added. When using 6142 the -mlong-double-128 option, the compiler will map the long double 6143 data type to 128-bit IEEE floating point. Using this option 6144 constitutes an ABI change, and requires glibc support. 6145 * Various changes to improve performance of generated code have been 6146 implemented, including: 6147 + In functions that do not require a literal pool, register %r13 6148 (which is traditionally reserved as literal pool pointer), can 6149 now be freely used for other purposes by the compiler. 6150 + More precise tracking of register use allows the compiler to 6151 generate more efficient function prolog and epilog code in 6152 certain cases. 6153 + The SEARCH STRING, COMPARE LOGICAL STRING, and MOVE STRING 6154 instructions are now used to implement C string functions. 6155 + The MOVE CHARACTER instruction with single byte overlap is now 6156 used to implement the memset function with non-zero fill byte. 6157 + The LOAD ZERO instructions are now used where appropriate. 6158 + The INSERT CHARACTERS UNDER MASK, STORE CHARACTERS UNDER MASK, 6159 and INSERT IMMEDIATE instructions are now used more frequently 6160 to optimize bitfield operations. 6161 + The BRANCH ON COUNT instruction is now used more frequently. 6162 In particular, the fact that a loop contains a subroutine call 6163 no longer prevents the compiler from using this instruction. 6164 + The compiler is now aware that all shift and rotate 6165 instructions implicitly truncate the shift count to six bits. 6166 * Back-end support for the following generic features has been 6167 implemented: 6168 + The full set of [5]built-in functions for atomic memory 6169 access. 6170 + The -fstack-protector feature. 6171 + The optimization pass avoiding unnecessary stores of incoming 6172 argument registers in functions with variable argument list. 6173 6174 SPARC 6175 6176 * The default code model in 64-bit mode has been changed from 6177 Medium/Anywhere to Medium/Middle on Solaris. 6178 * TLS support is disabled by default on Solaris prior to release 10. 6179 It can be enabled on TLS-capable Solaris 9 versions (4/04 release 6180 and later) by specifying --enable-tls at configure time. 6181 6182 MorphoSys 6183 6184 * Support has been added for this new architecture. 6185 6186 Obsolete Systems 6187 6188 Documentation improvements 6189 6190 Other significant improvements 6191 6192 * GCC can now emit code for protecting applications from 6193 stack-smashing attacks. The protection is realized by buffer 6194 overflow detection and reordering of stack variables to avoid 6195 pointer corruption. 6196 * Some built-in functions have been fortified to protect them against 6197 various buffer overflow (and format string) vulnerabilities. 6198 Compared to the mudflap bounds checking feature, the safe builtins 6199 have far smaller overhead. This means that programs built using 6200 safe builtins should not experience any measurable slowdown. 6201 6202 GCC 4.1.2 6203 6204 This is the [6]list of problem reports (PRs) from GCC's bug tracking 6205 system that are known to be fixed in the 4.1.2 release. This list might 6206 not be complete (that is, it is possible that some PRs that have been 6207 fixed are not listed here). 6208 6209 When generating code for a shared library, GCC now recognizes that 6210 global functions may be replaced when the program runs. Therefore, it 6211 is now more conservative in deducing information from the bodies of 6212 functions. For example, in this example: 6213 void f() {} 6214 void g() { 6215 try { f(); } 6216 catch (...) { 6217 cout << "Exception"; 6218 } 6219 } 6220 6221 G++ would previously have optimized away the catch clause, since it 6222 would have concluded that f cannot throw exceptions. Because users may 6223 replace f with another function in the main body of the program, this 6224 optimization is unsafe, and is no longer performed. If you wish G++ to 6225 continue to optimize as before, you must add a throw() clause to the 6226 declaration of f to make clear that it does not throw exceptions. 6227 6228 6229 For questions related to the use of GCC, please consult these web 6230 pages and the [7]GCC manuals. If that fails, the 6231 [8]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6232 web pages and the development of GCC are welcome on our developer 6233 list at [9]gcc (a] gcc.gnu.org. All of [10]our lists have public 6234 archives. 6235 6236 Copyright (C) [11]Free Software Foundation, Inc. Verbatim copying and 6237 distribution of this entire article is permitted in any medium, 6238 provided this notice is preserved. 6239 6240 These pages are [12]maintained by the GCC team. Last modified 6241 2012-11-02[13]. 6242 6243 References 6244 6245 1. http://gcc.gnu.org/gcc-4.1/changes.html#4.1.2 6246 2. http://developer.classpath.org/mediation/ClasspathGraphicsImagesText 6247 3. http://gcc.gnu.org/ml/java/2005-05/msg00260.html 6248 4. http://developer.classpath.org/doc/ 6249 5. http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html 6250 6. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.1.2 6251 7. http://gcc.gnu.org/onlinedocs/ 6252 8. mailto:gcc-help (a] gcc.gnu.org 6253 9. mailto:gcc (a] gcc.gnu.org 6254 10. http://gcc.gnu.org/lists.html 6255 11. http://www.fsf.org/ 6256 12. http://gcc.gnu.org/about.html 6257 13. http://validator.w3.org/check/referer 6258 ====================================================================== 6259 http://gcc.gnu.org/gcc-4.0/index.html 6260 6261 GCC 4.0 Release Series 6262 6263 January 31, 2007 6264 6265 The [1]GNU project and the GCC developers are pleased to announce the 6266 release of GCC 4.0.4. 6267 6268 This release is a bug-fix release, containing fixes for regressions in 6269 GCC 4.0.3 relative to previous releases of GCC. 6270 6271 Release History 6272 6273 GCC 4.0.4 6274 January 31, 2007 ([2]changes) 6275 6276 GCC 4.0.3 6277 March 10, 2006 ([3]changes) 6278 6279 GCC 4.0.2 6280 September 28, 2005 ([4]changes) 6281 6282 GCC 4.0.1 6283 July 7, 2005 ([5]changes) 6284 6285 GCC 4.0.0 6286 April 20, 2005 ([6]changes) 6287 6288 References and Acknowledgements 6289 6290 GCC used to stand for the GNU C Compiler, but since the compiler 6291 supports several other languages aside from C, it now stands for the 6292 GNU Compiler Collection. 6293 6294 A list of [7]successful builds is updated as new information becomes 6295 available. 6296 6297 The GCC developers would like to thank the numerous people that have 6298 contributed new features, improvements, bug fixes, and other changes as 6299 well as test results to GCC. This [8]amazing group of volunteers is 6300 what makes GCC successful. 6301 6302 For additional information about GCC please refer to the [9]GCC project 6303 web site or contact the [10]GCC development mailing list. 6304 6305 To obtain GCC please use [11]our mirror sites, or [12]our SVN server. 6306 6307 6308 For questions related to the use of GCC, please consult these web 6309 pages and the [13]GCC manuals. If that fails, the 6310 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6311 web pages and the development of GCC are welcome on our developer 6312 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 6313 archives. 6314 6315 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 6316 distribution of this entire article is permitted in any medium, 6317 provided this notice is preserved. 6318 6319 These pages are [18]maintained by the GCC team. Last modified 6320 2012-11-02[19]. 6321 6322 References 6323 6324 1. http://www.gnu.org/ 6325 2. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.4 6326 3. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.3 6327 4. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.2 6328 5. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.1 6329 6. http://gcc.gnu.org/gcc-4.0/changes.html 6330 7. http://gcc.gnu.org/gcc-4.0/buildstat.html 6331 8. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 6332 9. http://gcc.gnu.org/index.html 6333 10. mailto:gcc (a] gcc.gnu.org 6334 11. http://gcc.gnu.org/mirrors.html 6335 12. http://gcc.gnu.org/svn.html 6336 13. http://gcc.gnu.org/onlinedocs/ 6337 14. mailto:gcc-help (a] gcc.gnu.org 6338 15. mailto:gcc (a] gcc.gnu.org 6339 16. http://gcc.gnu.org/lists.html 6340 17. http://www.fsf.org/ 6341 18. http://gcc.gnu.org/about.html 6342 19. http://validator.w3.org/check/referer 6343 ====================================================================== 6344 http://gcc.gnu.org/gcc-4.0/changes.html 6345 6346 GCC 4.0 Release Series 6347 Changes, New Features, and Fixes 6348 6349 The latest release in the 4.0 release series is [1]GCC 4.0.4. 6350 6351 Caveats 6352 6353 * GCC now generates location lists by default when compiling with 6354 debug info and optimization. 6355 + GDB 6.0 and older crashes when it sees location lists. GDB 6.1 6356 or later is needed to debug binaries containing location 6357 lists. 6358 + When you are trying to view a value of a variable in a part of 6359 a function where it has no location (for example when the 6360 variable is no longer used and thus its location was used for 6361 something else) GDB will say that it is not available. 6362 You can disable generating location lists by -fno-var-tracking. 6363 * GCC no longer accepts the -fwritable-strings option. Use named 6364 character arrays when you need a writable string. 6365 * The options -freduce-all-givs and -fmove-all-movables have been 6366 discontinued. They were used to circumvent a shortcoming in the 6367 heuristics of the old loop optimization code with respect to common 6368 Fortran constructs. The new (tree) loop optimizer works differently 6369 and doesn't need those work-arounds. 6370 * The graph-coloring register allocator, formerly enabled by the 6371 option -fnew-ra, has been discontinued. 6372 * -I- has been deprecated. -iquote is meant to replace the need for 6373 this option. 6374 * The MIPS -membedded-pic and -mrnames options have been removed. 6375 * All MIPS targets now require the GNU assembler. In particular, IRIX 6376 configurations can no longer use the MIPSpro assemblers, although 6377 they do still support the MIPSpro linkers. 6378 * The SPARC option -mflat has been removed. 6379 * English-language diagnostic messages will now use Unicode quotation 6380 marks in UTF-8 locales. (Non-English messages already used the 6381 quotes appropriate for the language in previous releases.) If your 6382 terminal does not support UTF-8 but you are using a UTF-8 locale 6383 (such locales are the default on many GNU/Linux systems) then you 6384 should set LC_CTYPE=C in the environment to disable that locale. 6385 Programs that parse diagnostics and expect plain ASCII 6386 English-language messages should set LC_ALL=C. See [2]Markus Kuhn's 6387 explanation of Unicode quotation marks for more information. 6388 * The specs file is no longer installed on most platforms. Most users 6389 will be totally unaffected. However, if you are accustomed to 6390 editing the specs file yourself, you will now have to use the 6391 -dumpspecs option to generate the specs file, and then edit the 6392 resulting file. 6393 6394 General Optimizer Improvements 6395 6396 * The [3]tree ssa branch has been merged. This merge has brought in a 6397 completely new optimization framework based on a higher level 6398 intermediate representation than the existing RTL representation. 6399 Numerous new code transformations based on the new framework are 6400 available in GCC 4.0, including: 6401 + Scalar replacement of aggregates 6402 + Constant propagation 6403 + Value range propagation 6404 + Partial redundancy elimination 6405 + Load and store motion 6406 + Strength reduction 6407 + Dead store elimination 6408 + Dead and unreachable code elimination 6409 + [4]Autovectorization 6410 + Loop interchange 6411 + Tail recursion by accumulation 6412 Many of these passes outperform their counterparts from previous 6413 GCC releases. 6414 * [5]Swing Modulo Scheduling (SMS). An RTL level instruction 6415 scheduling optimization intended for loops that perform heavy 6416 computations. 6417 6418 New Languages and Language specific improvements 6419 6420 C family 6421 6422 * The sentinel attribute has been added to GCC. This function 6423 attribute allows GCC to warn when variadic functions such as execl 6424 are not NULL terminated. See the GCC manual for a complete 6425 description of its behavior. 6426 * Given __attribute__((alias("target"))) it is now an error if target 6427 is not a symbol, defined in the same translation unit. This also 6428 applies to aliases created by #pragma weak alias=target. This is 6429 because it's meaningless to define an alias to an undefined symbol. 6430 On Solaris, the native assembler would have caught this error, but 6431 GNU as does not. 6432 6433 C and Objective-C 6434 6435 * The -Wstrict-aliasing=2 option has been added. This warning catches 6436 all unsafe cases, but it may also give a warning for some cases 6437 that are safe. 6438 * The cast-as-lvalue, conditional-expression-as-lvalue and 6439 compound-expression-as-lvalue extensions, which were deprecated in 6440 3.3.4 and 3.4, have been removed. 6441 * The -fwritable-strings option, which was deprecated in 3.4, has 6442 been removed. 6443 * #pragma pack() semantics have been brought closer to those used by 6444 other compilers. This also applies to C++. 6445 * Taking the address of a variable with register storage is invalid 6446 in C. GCC now issues an error instead of a warning. 6447 * Arrays of incomplete element type are invalid in C. GCC now issues 6448 an error for such arrays. Declarations such as extern struct s x[]; 6449 (where struct s has not been defined) can be moved after the 6450 definition of struct s. Function parameters declared as arrays of 6451 incomplete type can instead be declared as pointers. 6452 6453 C++ 6454 6455 * When compiling without optimizations (-O0), the C++ frontend is 6456 much faster than in any previous versions of GCC. Independent 6457 testers have measured speed-ups up to 25% in real-world production 6458 code, compared to the 3.4 family (which was already the fastest 6459 version to date). Upgrading from older versions might show even 6460 bigger improvements. 6461 * ELF visibility attributes can now be applied to a class type, so 6462 that it affects every member function of a class at once, without 6463 having to specify each individually: 6464 class __attribute__ ((visibility("hidden"))) Foo 6465 { 6466 int foo1(); 6467 void foo2(); 6468 }; 6469 The syntax is deliberately similar to the __declspec() system used 6470 by Microsoft Windows based compilers, allowing cross-platform 6471 projects to easily reuse their existing macro system for denoting 6472 exports and imports. By explicitly marking internal classes never 6473 used outside a binary as hidden, one can completely avoid PLT 6474 indirection overheads during their usage by the compiler. You can 6475 find out more about the advantages of this at 6476 [6]http://www.akkadia.org/drepper/dsohowto.pdf 6477 * The -fvisibility-inlines-hidden option has been added which marks 6478 all inlineable functions as having hidden ELF visibility, thus 6479 removing their symbol and typeinfo from the exported symbol table 6480 of the output ELF binary. Using this option can reduce the exported 6481 symbol count of template-heavy code by up to 40% with no code 6482 change at all, thus notably improving link and load times for the 6483 binary as well as a reduction in size of up to 10%. Also, check the 6484 new [7]-fvisibility option. 6485 * The compiler now uses the library interface specified by the [8]C++ 6486 ABI for thread-safe initialization of function-scope static 6487 variables. Most users should leave this alone, but embedded 6488 programmers may want to disable this by specifying 6489 -fno-threadsafe-statics for a small savings in code size. 6490 * Taking the address of an explicit register variable is no longer 6491 supported. Note that C++ allows taking the address of variables 6492 with register storage so this will continue to compile with a 6493 warning. For example, assuming that r0 is a machine register: 6494 register int foo asm ("r0"); 6495 register int bar; 6496 &foo; // error, no longer accepted 6497 &bar; // OK, with a warning 6498 * G++ has an undocumented extension to virtual function covariancy 6499 rules that allowed the overrider to return a type that was 6500 implicitly convertable to the overridden function's return type. 6501 For instance a function returning void * could be overridden by a 6502 function returning T *. This is now deprecated and will be removed 6503 in a future release. 6504 * The G++ minimum and maximum operators (<? and >?) and their 6505 compound forms (<?=) and >?=) have been deprecated and will be 6506 removed in a future version. Code using these operators should be 6507 modified to use std::min and std::max instead. 6508 * Declaration of nested classes of class templates as friends are 6509 supported: 6510 template <typename T> struct A { 6511 class B {}; 6512 }; 6513 class C { 6514 template <typename T> friend class A<T>::B; 6515 }; 6516 This complements the feature member functions of class templates as 6517 friends introduced in GCC 3.4.0. 6518 * When declaring a friend class using an unqualified name, classes 6519 outside the innermost non-class scope are not searched: 6520 class A; 6521 namespace N { 6522 class B { 6523 friend class A; // Refer to N::A which has not been declared yet 6524 // because name outside namespace N are not searched 6525 friend class ::A; // Refer to ::A 6526 }; 6527 } 6528 Hiding the friend name until declaration is still not implemented. 6529 * Friends of classes defined outside their namespace are correctly 6530 handled: 6531 namespace N { 6532 class A; 6533 } 6534 class N::A { 6535 friend class B; // Refer to N::B in GCC 4.0.0 6536 // but ::B in earlier versions of GCC 6537 }; 6538 6539 Runtime Library (libstdc++) 6540 6541 * Optimization work: 6542 + Added efficient specializations of istream functions for char 6543 and wchar_t. 6544 + Further performance tuning of strings, in particular wrt 6545 single-char append and getline. 6546 + iter_swap - and therefore most of the mutating algorithms - 6547 now makes an unqualified call to swap when the value_type of 6548 the two iterators is the same. 6549 * A large subset of the features in Technical Report 1 (TR1 for 6550 short) is experimentally delivered (i.e., no guarantees about the 6551 implementation are provided. In particular it is not promised that 6552 the library will remain link-compatible when code using TR1 is 6553 used): 6554 + General utilities such as reference_wrapper and shared_ptr. 6555 + Function objects, i.e., result_of, mem_fn, bind, function. 6556 + Support for metaprogramming. 6557 + New containers such as tuple, array, unordered_set, 6558 unordered_map, unordered_multiset, unordered_multimap. 6559 * As usual, many bugs have been fixed and LWG resolutions implemented 6560 for the first time (e.g., DR 409). 6561 6562 Java 6563 6564 * In order to prevent naming conflicts with other implementations of 6565 these tools, some GCJ binaries have been renamed: 6566 + rmic is now grmic, 6567 + rmiregistry is now grmiregistry, and 6568 + jar is now fastjar. 6569 In particular, these names were problematic for the jpackage.org 6570 packaging conventions which install symlinks in /usr/bin that point 6571 to the preferred versions of these tools. 6572 * The -findirect-dispatch argument to the compiler now works and 6573 generates code following a new "binary compatibility" ABI. Code 6574 compiled this way follows the binary compatibility rules of the 6575 Java Language Specification. 6576 * libgcj now has support for using GCJ as a JIT, using the 6577 gnu.gcj.jit family of system properties. 6578 * libgcj can now find a shared library corresponding to the bytecode 6579 representation of a class. See the documentation for the new 6580 gcj-dbtool program, and the new gnu.gcj.precompiled.db.path system 6581 property. 6582 * There have been many improvements to the class library. Here are 6583 some highlights: 6584 + Much more of AWT and Swing exist. 6585 + Many new packages and classes were added, including 6586 java.util.regex, java.net.URI, javax.crypto, 6587 javax.crypto.interfaces, javax.crypto.spec, javax.net, 6588 javax.net.ssl, javax.security.auth, 6589 javax.security.auth.callback, javax.security.auth.login, 6590 javax.security.auth.x500, javax.security.sasl, org.ietf.jgss, 6591 javax.imageio, javax.imageio.event, javax.imageio.spi, 6592 javax.print, javax.print.attribute, 6593 javax.print.attribute.standard, javax.print.event, and 6594 javax.xml 6595 + Updated SAX and DOM, and imported GNU JAXP 6596 6597 Fortran 6598 6599 * A new [9]Fortran front end has replaced the aging GNU Fortran 77 6600 front end. The new front end supports Fortran 90 and Fortran 95. It 6601 may not yet be as stable as the old Fortran front end. 6602 6603 Ada 6604 6605 * Ada (with tasking and Zero Cost Exceptions) is now available on 6606 many more targets, including but not limited to: alpha-linux, 6607 hppa-hpux, hppa-linux, powerpc-darwin, powerpc-linux, s390-linux, 6608 s390x-linux, sparc-linux. 6609 * Some of the new Ada 2005 features are now implemented like 6610 Wide_Wide_Character and Ada.Containers. 6611 * Many bugs have been fixed, tools and documentation improved. 6612 * To compile Ada from the sources, install an older working Ada 6613 compiler and then use --enable-languages=ada at configuration time, 6614 since the Ada frontend is not currently activated by default. See 6615 the [10]Installing GCC for details. 6616 6617 New Targets and Target Specific Improvements 6618 6619 H8/300 6620 6621 * The frame layout has changed. In the new layout, the prologue of a 6622 function first saves registers and then allocate space for locals, 6623 resulting in an 1% improvement on code size. 6624 6625 IA-32/x86-64 (AMD64) 6626 6627 * The acos, asin, drem, exp10, exp2, expm1, fmod, ilogb, log10, 6628 log1p, log2, logb and tan mathematical builtins (and their float 6629 and long double variants) are now implemented as inline x87 6630 intrinsics when using -ffast-math. 6631 * The ceil, floor, nearbyint, rint and trunc mathematical builtins 6632 (and their float and long double variants) are now implemented as 6633 inline x87 intrinsics when using -ffast-math. 6634 * The x87's fsincos instruction is now used automatically with 6635 -ffast-math when calculating both the sin and cos of the same 6636 argument. 6637 * Instruction selection for multiplication and division by constants 6638 has been improved. 6639 6640 IA-64 6641 6642 * Floating point division, integer division and sqrt are now inlined, 6643 resulting in significant performance improvements on some codes. 6644 6645 MIPS 6646 6647 * Division by zero checks now use conditional traps if the target 6648 processor supports them. This decreases code size by one word per 6649 division operation. The old behavior (branch and break) can be 6650 obtained either at configure time by passing --with-divide=breaks 6651 to configure or at runtime by passing -mdivide-breaks to GCC. 6652 * Support for MIPS64 paired-single instructions has been added. It is 6653 enabled by -mpaired-single and can be accessed using both the 6654 target-independent vector extensions and new MIPS-specific built-in 6655 functions. 6656 * Support for the MIPS-3D ASE has been added. It is enabled by 6657 -mips3d and provides new MIPS-3D-specific built-in functions. 6658 * The -mexplicit-relocs option now supports static n64 code (as is 6659 used, for example, in 64-bit linux kernels). -mexplicit-relocs 6660 should now be feature-complete and is enabled by default when GCC 6661 is configured to use a compatible assembler. 6662 * Support for the NEC VR4130 series has been added. This support 6663 includes the use of VR-specific instructions and a new VR4130 6664 scheduler. Full VR4130 support can be selected with -march=vr4130 6665 while code for any ISA can be tuned for the VR4130 using 6666 -mtune=vr4130. There is also a new -mvr4130-align option that 6667 produces better schedules at the cost of increased code size. 6668 * Support for the Broadcom SB-1 has been extended. There is now an 6669 SB-1 scheduler as well as support for the SB-1-specific 6670 paired-single instructions. Full SB-1 support can be selected with 6671 -march=sb1 while code for any ISA can be optimized for the SB-1 6672 using -mtune=sb1. 6673 * The compiler can now work around errata in R4000, R4400, VR4120 and 6674 VR4130 processors. These workarounds are enabled by -mfix-r4000, 6675 -mfix-r4400, -mfix-vr4120 and -mfix-vr4130 respectively. The VR4120 6676 and VR4130 workarounds need binutils 2.16 or above. 6677 * IRIX shared libraries are now installed into the standard library 6678 directories: o32 libraries go into lib/, n32 libraries go into 6679 lib32/ and n64 libraries go into lib64/. 6680 * The compiler supports a new -msym32 option. It can be used to 6681 optimize n64 code in which all symbols are known to have 32-bit 6682 values. 6683 6684 S/390 and zSeries 6685 6686 * New command-line options help to generate code intended to run in 6687 an environment where stack space is restricted, e.g. Linux kernel 6688 code: 6689 + -mwarn-framesize and -mwarn-dynamicstack trigger compile-time 6690 warnings for single functions that require large or dynamic 6691 stack frames. 6692 + -mstack-size and -mstack-guard generate code that checks for 6693 stack overflow at run time. 6694 + -mpacked-stack generates code that reduces the stack frame 6695 size of many functions by reusing unneeded parts of the stack 6696 bias area. 6697 * The -msoft-float option now ensures that generated code never 6698 accesses floating point registers. 6699 * The s390x-ibm-tpf target now fully supports C++, including 6700 exceptions and threads. 6701 * Various changes to improve performance of the generated code have 6702 been implemented, including: 6703 + GCC now uses sibling calls where possible. 6704 + Condition code handling has been optimized, allowing GCC to 6705 omit redundant comparisons in certain cases. 6706 + The cost function guiding many optimizations has been refined 6707 to more accurately represent the z900 and z990 processors. 6708 + The ADD LOGICAL WITH CARRY and SUBTRACT LOGICAL WITH BORROW 6709 instructions are now used to avoid conditional branches in 6710 certain cases. 6711 + The back end now uses the LEGITIMIZE_RELOAD_ADDRESS feature to 6712 optimize address arithmetic required to access large stack 6713 frames. 6714 + GCC now makes more efficient use of memory-to-memory type 6715 instructions (MVC, CLC, ...). 6716 + More precise tracking of special register use allows better 6717 instruction scheduling, in particular of the function prologue 6718 and epilogue sequences. 6719 + The Java front end now generates inline code to implement 6720 integer division, instead of calling library routines. 6721 6722 SPARC 6723 6724 * The options -mv8, -msparclite, -mcypress, -msupersparc, -mf930 and 6725 -mf934 have been removed. They have been replaced with -mcpu=xxx. 6726 * The internal model used to estimate the relative cost of each 6727 instruction has been updated. It is expected to give better results 6728 on recent UltraSPARC processors. 6729 * Code generation for function prologues and epilogues has been 6730 improved, resulting in better scheduling and allowing multiple exit 6731 points in functions. 6732 * Support for Sun's Visual Instruction Set (VIS) has been enhanced. 6733 It is enabled by -mvis and provides new built-in functions for VIS 6734 instructions on UltraSPARC processors. 6735 * The option -mapp-regs has been turned on by default on Solaris too. 6736 6737 NetWare 6738 6739 * Novell NetWare (on ix86, no other hardware platform was ever really 6740 supported by this OS) has been re-enabled and the ABI supported by 6741 GCC has been brought into sync with that of MetroWerks CodeWarrior 6742 (the ABI previously supported was that of some Unix systems, which 6743 NetWare never tried to support). 6744 6745 Obsolete Systems 6746 6747 Support for a number of older systems has been declared obsolete in GCC 6748 4.0. Unless there is activity to revive them, the next release of GCC 6749 will have their sources permanently removed. 6750 6751 All GCC ports for the following processor architectures have been 6752 declared obsolete: 6753 * Intel i860 6754 * Ubicom IP2022 6755 * National Semiconductor NS32K 6756 * Texas Instruments TMS320C[34]x 6757 6758 Also, those for some individual systems have been obsoleted: 6759 * SPARC family 6760 + SPARClite-based systems (sparclite-*-coff, sparclite-*-elf, 6761 sparc86x-*-elf) 6762 + OpenBSD 32-bit (sparc-*-openbsd*) 6763 6764 Documentation improvements 6765 6766 Other significant improvements 6767 6768 * Location lists are now generated by default when compiling with 6769 debug info and optimization. Location lists provide more accurate 6770 debug info about locations of variables and they allow debugging 6771 code compiled with -fomit-frame-pointer. 6772 * The -fvisibility option has been added which allows the default ELF 6773 visibility of all symbols to be set per compilation and the new 6774 #pragma GCC visibility preprocessor command allows the setting of 6775 default ELF visibility for a region of code. Using 6776 -fvisibility=hidden especially in combination with the new 6777 -fvisibility-inlines-hidden can yield substantial improvements in 6778 output binary quality including avoiding PLT indirection overheads, 6779 reduction of the exported symbol count by up to 60% (with resultant 6780 improvements to link and load times), better scope for the 6781 optimizer to improve code and up to a 20% reduction in binary size. 6782 Using these options correctly yields a binary with a similar symbol 6783 count to a Windows DLL. 6784 Perhaps more importantly, this new feature finally allows (with 6785 careful planning) complete avoidance of symbol clashes when 6786 manually loading shared objects with RTLD_GLOBAL, thus finally 6787 solving problems many projects such as python were forced to use 6788 RTLD_LOCAL for (with its resulting issues for C++ correctness). You 6789 can find more information about using these options at 6790 [11]http://gcc.gnu.org/wiki/Visibility. 6791 __________________________________________________________________ 6792 6793 GCC 4.0.1 6794 6795 This is the [12]list of problem reports (PRs) from GCC's bug tracking 6796 system that are known to be fixed in the 4.0.1 release. This list might 6797 not be complete (that is, it is possible that some PRs that have been 6798 fixed are not listed here). 6799 6800 GCC 4.0.2 6801 6802 This is the [13]list of problem reports (PRs) from GCC's bug tracking 6803 system that are known to be fixed in the 4.0.2 release. This list might 6804 not be complete (that is, it is possible that some PRs that have been 6805 fixed are not listed here). 6806 6807 Unfortunately, due to a release engineering failure, this release has a 6808 regression on Solaris that will affect some C++ programs. We suggest 6809 that Solaris users apply a [14]patch that corrects the problem. Users 6810 who do not wish to apply the patch should explicitly link C++ programs 6811 with the -pthreads option, even if they do not use threads. This 6812 problem has been corrected in the current 4.0 branch sources and will 6813 not be present in GCC 4.0.3. 6814 6815 GCC 4.0.3 6816 6817 Starting with this release, the function getcontext is recognized by 6818 the compiler as having the same semantics as the setjmp function. In 6819 particular, the compiler will ensure that all registers are dead before 6820 calling such a function and will emit a warning about the variables 6821 that may be clobbered after the second return from the function. 6822 6823 GCC 4.0.4 6824 6825 This is the [15]list of problem reports (PRs) from GCC's bug tracking 6826 system that are known to be fixed in the 4.0.4 release. This list might 6827 not be complete (that is, it is possible that some PRs that have been 6828 fixed are not listed here). 6829 6830 The 4.0.4 release is provided for those that require a high degree of 6831 binary compatibility with previous 4.0.x releases. For most users, the 6832 GCC team recommends that version 4.1.1 or later be used instead." 6833 6834 6835 For questions related to the use of GCC, please consult these web 6836 pages and the [16]GCC manuals. If that fails, the 6837 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6838 web pages and the development of GCC are welcome on our developer 6839 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 6840 archives. 6841 6842 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 6843 distribution of this entire article is permitted in any medium, 6844 provided this notice is preserved. 6845 6846 These pages are [21]maintained by the GCC team. Last modified 6847 2012-11-02[22]. 6848 6849 References 6850 6851 1. http://gcc.gnu.org/gcc-4.0/changes.html#4.0.4 6852 2. http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html 6853 3. http://gcc.gnu.org/projects/tree-ssa/ 6854 4. http://gcc.gnu.org/projects/tree-ssa/vectorization.html 6855 5. http://gcc.gnu.org/news/sms.html 6856 6. http://www.akkadia.org/drepper/dsohowto.pdf 6857 7. http://gcc.gnu.org/gcc-4.0/changes.html#visibility 6858 8. http://mentorembedded.github.com/cxx-abi/ 6859 9. http://gcc.gnu.org/fortran/ 6860 10. http://gcc.gnu.org/install/ 6861 11. http://gcc.gnu.org/wiki/Visibility 6862 12. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.1 6863 13. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.2 6864 14. http://gcc.gnu.org/ml/gcc-cvs/2005-09/msg00984.html 6865 15. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.0.4 6866 16. http://gcc.gnu.org/onlinedocs/ 6867 17. mailto:gcc-help (a] gcc.gnu.org 6868 18. mailto:gcc (a] gcc.gnu.org 6869 19. http://gcc.gnu.org/lists.html 6870 20. http://www.fsf.org/ 6871 21. http://gcc.gnu.org/about.html 6872 22. http://validator.w3.org/check/referer 6873 ====================================================================== 6874 http://gcc.gnu.org/gcc-3.4/index.html 6875 6876 GCC 3.4 Release Series 6877 6878 May 26, 2006 6879 6880 The [1]GNU project and the GCC developers are pleased to announce the 6881 release of GCC 3.4.6. 6882 6883 This release is a bug-fix release, containing fixes for regressions in 6884 GCC 3.4.4 relative to previous releases of GCC. This is the last of the 6885 3.4.x series. 6886 6887 The GCC 3.4 release series includes numerous [2]new features, 6888 improvements, bug fixes, and other changes, thanks to an [3]amazing 6889 group of volunteers. 6890 6891 Release History 6892 6893 GCC 3.4.6 6894 March 6, 2006 ([4]changes) 6895 6896 GCC 3.4.5 6897 November 30, 2005 ([5]changes) 6898 6899 GCC 3.4.4 6900 May 18, 2005 ([6]changes) 6901 6902 GCC 3.4.3 6903 November 4, 2004 ([7]changes) 6904 6905 GCC 3.4.2 6906 September 6, 2004 ([8]changes) 6907 6908 GCC 3.4.1 6909 July 1, 2004 ([9]changes) 6910 6911 GCC 3.4.0 6912 April 18, 2004 ([10]changes) 6913 6914 References and Acknowledgements 6915 6916 GCC used to stand for the GNU C Compiler, but since the compiler 6917 supports several other languages aside from C, it now stands for the 6918 GNU Compiler Collection. 6919 6920 A list of [11]successful builds is updated as new information becomes 6921 available. 6922 6923 The GCC developers would like to thank the numerous people that have 6924 contributed new features, improvements, bug fixes, and other changes as 6925 well as test results to GCC. This [12]amazing group of volunteers is 6926 what makes GCC successful. 6927 6928 For additional information about GCC please refer to the [13]GCC 6929 project web site or contact the [14]GCC development mailing list. 6930 6931 To obtain GCC please use [15]our mirror sites, or [16]our SVN server. 6932 6933 6934 For questions related to the use of GCC, please consult these web 6935 pages and the [17]GCC manuals. If that fails, the 6936 [18]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 6937 web pages and the development of GCC are welcome on our developer 6938 list at [19]gcc (a] gcc.gnu.org. All of [20]our lists have public 6939 archives. 6940 6941 Copyright (C) [21]Free Software Foundation, Inc. Verbatim copying and 6942 distribution of this entire article is permitted in any medium, 6943 provided this notice is preserved. 6944 6945 These pages are [22]maintained by the GCC team. Last modified 6946 2012-11-02[23]. 6947 6948 References 6949 6950 1. http://www.gnu.org/ 6951 2. http://gcc.gnu.org/gcc-3.4/changes.html 6952 3. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 6953 4. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.6 6954 5. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.5 6955 6. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.4 6956 7. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.3 6957 8. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.2 6958 9. http://gcc.gnu.org/gcc-3.4/changes.html#3.4.1 6959 10. http://gcc.gnu.org/gcc-3.4/changes.html 6960 11. http://gcc.gnu.org/gcc-3.4/buildstat.html 6961 12. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 6962 13. http://gcc.gnu.org/index.html 6963 14. mailto:gcc (a] gcc.gnu.org 6964 15. http://gcc.gnu.org/mirrors.html 6965 16. http://gcc.gnu.org/svn.html 6966 17. http://gcc.gnu.org/onlinedocs/ 6967 18. mailto:gcc-help (a] gcc.gnu.org 6968 19. mailto:gcc (a] gcc.gnu.org 6969 20. http://gcc.gnu.org/lists.html 6970 21. http://www.fsf.org/ 6971 22. http://gcc.gnu.org/about.html 6972 23. http://validator.w3.org/check/referer 6973 ====================================================================== 6974 http://gcc.gnu.org/gcc-3.4/changes.html 6975 6976 GCC 3.4 Release Series 6977 Changes, New Features, and Fixes 6978 6979 The final release in the 3.4 release series is [1]GCC 3.4.6. The series 6980 is now closed. 6981 6982 GCC 3.4 has [2]many improvements in the C++ frontend. Before reporting 6983 a bug, please make sure it's really GCC, and not your code, that is 6984 broken. 6985 6986 Caveats 6987 6988 * GNU Make is now required to build GCC. 6989 * With -nostdinc the preprocessor used to ignore both standard 6990 include paths and include paths contained in environment variables. 6991 It was neither documented nor intended that environment variable 6992 paths be ignored, so this has been corrected. 6993 * GCC no longer accepts the options -fvolatile, -fvolatile-global and 6994 -fvolatile-static. It is unlikely that they worked correctly in any 6995 3.x release. 6996 * GCC no longer ships <varargs.h>. Use <stdarg.h> instead. 6997 * Support for all the systems [3]obsoleted in GCC 3.3 has been 6998 removed from GCC 3.4. See below for a [4]list of systems which are 6999 obsoleted in this release. 7000 * GCC now requires an ISO C90 (ANSI C89) C compiler to build. K&R C 7001 compilers will not work. 7002 * The implementation of the [5]MIPS ABIs has changed. As a result, 7003 the code generated for certain MIPS targets will not be binary 7004 compatible with earlier releases. 7005 * In previous releases, the MIPS port had a fake "hilo" register with 7006 the user-visible name accum. This register has been removed. 7007 * The implementation of the [6]SPARC ABIs has changed. As a result, 7008 the code generated will not be binary compatible with earlier 7009 releases in certain cases. 7010 * The configure option --enable-threads=pthreads has been removed; 7011 use --enable-threads=posix instead, which should have the same 7012 effect. 7013 * Code size estimates used by inlining heuristics for C, Objective-C, 7014 C++ and Java have been redesigned significantly. As a result the 7015 parameters of -finline-insns, --param max-inline-insns-single and 7016 --param max-inline-insns-auto need to be reconsidered. 7017 * --param max-inline-slope and --param min-inline-insns have been 7018 removed; they are not needed for the new bottom-up inlining 7019 heuristics. 7020 * The new unit-at-a-time compilation scheme has several compatibility 7021 issues: 7022 + The order in which functions, variables, and top-level asm 7023 statements are emitted may have changed. Code relying on some 7024 particular ordering needs to be updated. The majority of such 7025 top-level asm statements can be replaced by section 7026 attributes. 7027 + Unreferenced static variables and functions are removed. This 7028 may result in undefined references when an asm statement 7029 refers to the variable/function directly. In that case either 7030 the variable/function shall be listed in asm statement operand 7031 or in the case of top-level asm statements the attribute used 7032 shall be used to force function/variable to be always output 7033 and considered as a possibly used by unknown code. 7034 For variables the attribute is accepted only by GCC 3.4 and 7035 newer, while for earlier versions it is sufficient to use 7036 unused to silence warnings about the variables not being 7037 referenced. To keep code portable across different GCC 7038 versions, you can use appropriate preprocessor conditionals. 7039 + Static functions now can use non-standard passing conventions 7040 that may break asm statements calling functions directly. 7041 Again the attribute used shall be used to prevent this 7042 behavior. 7043 As a temporary workaround, -fno-unit-at-a-time can be used, but 7044 this scheme may not be supported by future releases of GCC. 7045 * GCC 3.4 automatically places zero-initialized variables in the .bss 7046 section on some operating systems. Versions of GNU Emacs up to (and 7047 including) 21.3 will not work correctly when using this 7048 optimization; you can use -fno-zero-initialized-in-bss to disable 7049 it. 7050 * If GCC 3.4 is configured with --enable-threads=posix (the default 7051 on most targets that support pthreads) then _REENTRANT will be 7052 defined unconditionally by some libstdc++ headers. C++ code which 7053 relies on that macro to detect whether multi-threaded code is being 7054 compiled might change in meaning, possibly resulting in linker 7055 errors for single-threaded programs. Affected users of [7]Boost 7056 should compile single-threaded code with -DBOOST_DISABLE_THREADS. 7057 See Bugzilla for [8]more information. 7058 7059 General Optimizer Improvements 7060 7061 * Usability of the profile feedback and coverage testing has been 7062 improved. 7063 + Performance of profiled programs has been improved by faster 7064 profile merging code. 7065 + Better use of the profile feedback for optimization (loop 7066 unrolling and loop peeling). 7067 + File locking support allowing fork() calls and parallel runs 7068 of profiled programs. 7069 + Coverage file format has been redesigned. 7070 + gcov coverage tool has been improved. 7071 + make profiledbootstrap available to build a faster compiler. 7072 Experiments made on i386 hardware showed an 11% speedup on -O0 7073 and a 7.5% speedup on -O2 compilation of a [9]large C++ 7074 testcase. 7075 + New value profiling pass enabled via -fprofile-values 7076 + New value profile transformations pass enabled via -fvpt aims 7077 to optimize some code sequences by exploiting knowledge about 7078 value ranges or other properties of the operands. At the 7079 moment a conversion of expensive divisions into cheaper 7080 operations has been implemented. 7081 + New -fprofile-generate and -fprofile-use command-line options 7082 to simplify the use of profile feedback. 7083 * A new unit-at-a-time compilation scheme for C, Objective-C, C++ and 7084 Java which is enabled via -funit-at-a-time (and implied by -O2). In 7085 this scheme a whole file is parsed first and optimized later. The 7086 following basic inter-procedural optimizations are implemented: 7087 + Removal of unreachable functions and variables 7088 + Discovery of local functions (functions with static linkage 7089 whose address is never taken) 7090 + On i386, these local functions use register parameter passing 7091 conventions. 7092 + Reordering of functions in topological order of the call graph 7093 to enable better propagation of optimizing hints (such as the 7094 stack alignments needed by functions) in the back end. 7095 + Call graph based out-of-order inlining heuristics which allows 7096 to limit overall compilation unit growth (--param 7097 inline-unit-growth). 7098 Overall, the unit-at-a-time scheme produces a 1.3% improvement for 7099 the SPECint2000 benchmark on the i386 architecture (AMD Athlon 7100 CPU). 7101 * More realistic code size estimates used by inlining for C, 7102 Objective-C, C++ and Java. The growth of large functions can now be 7103 limited via --param large-function-insns and --param 7104 large-function-growth. 7105 * A new cfg-level loop optimizer pass replaces the old loop unrolling 7106 pass and adds two other loop transformations -- loop peeling and 7107 loop unswitching -- and also uses the profile feedback to limit 7108 code growth. (The three optimizations are enabled by 7109 -funroll-loops, -fpeel-loops and -funswitch-loops flags, 7110 respectively). 7111 The old loop unroller still can be enabled by -fold-unroll-loops 7112 and may produce better code in some cases, especially when the 7113 webizer optimization pass is not run. 7114 * A new web construction pass enabled via -fweb (and implied by -O3) 7115 improves the quality of register allocation, CSE, first scheduling 7116 pass and some other optimization passes by avoiding re-use of 7117 pseudo registers with non-overlapping live ranges. The pass almost 7118 always improves code quality but does make debugging difficult and 7119 thus is not enabled by default by -O2 7120 The pass is especially effective as cleanup after code duplication 7121 passes, such as the loop unroller or the tracer. 7122 * Experimental implementations of superblock or trace scheduling in 7123 the second scheduling pass can be enabled via 7124 -fsched2-use-superblocks and -fsched2-use-traces, respectively. 7125 7126 New Languages and Language specific improvements 7127 7128 Ada 7129 7130 * The Ada front end has been updated to include numerous bug fixes 7131 and enhancements. These include: 7132 + Improved project file support 7133 + Additional set of warnings about potential wrong code 7134 + Improved error messages 7135 + Improved code generation 7136 + Improved cross reference information 7137 + Improved inlining 7138 + Better run-time check elimination 7139 + Better error recovery 7140 + More efficient implementation of unbounded strings 7141 + Added features in GNAT.Sockets, GNAT.OS_Lib, GNAT.Debug_Pools, 7142 ... 7143 + New GNAT.xxxx packages (e.g. GNAT.Strings, 7144 GNAT.Exception_Action) 7145 + New pragmas 7146 + New -gnatS switch replacing gnatpsta 7147 + Implementation of new Ada features (in particular limited 7148 with, limited aggregates) 7149 7150 C/Objective-C/C++ 7151 7152 * Precompiled headers are now supported. Precompiled headers can 7153 dramatically speed up compilation of some projects. There are some 7154 known defects in the current precompiled header implementation that 7155 will result in compiler crashes in relatively rare situations. 7156 Therefore, precompiled headers should be considered a "technology 7157 preview" in this release. Read the manual for details about how to 7158 use precompiled headers. 7159 * File handling in the preprocessor has been rewritten. GCC no longer 7160 gets confused by symlinks and hardlinks, and now has a correct 7161 implementation of #import and #pragma once. These two directives 7162 have therefore been un-deprecated. 7163 * The undocumented extension that allowed C programs to have a label 7164 at the end of a compound statement, which has been deprecated since 7165 GCC 3.0, has been removed. 7166 * The cast-as-lvalue extension has been removed for C++ and 7167 deprecated for C and Objective-C. In particular, code like this: 7168 int i; 7169 (char) i = 5; 7170 7171 or this: 7172 char *p; 7173 ((int *) p)++; 7174 7175 is no longer accepted for C++ and will not be accepted for C and 7176 Objective-C in a future version. 7177 * The conditional-expression-as-lvalue extension has been deprecated 7178 for C and Objective-C. In particular, code like this: 7179 int a, b, c; 7180 (a ? b : c) = 2; 7181 7182 will not be accepted for C and Objective-C in a future version. 7183 * The compound-expression-as-lvalue extension has been deprecated for 7184 C and Objective-C. In particular, code like this: 7185 int a, b; 7186 (a, b) = 2; 7187 7188 will not be accepted for C and Objective-C in a future version. A 7189 possible non-intrusive workaround is the following: 7190 (*(a, &b)) = 2; 7191 7192 * Several [10]built-in functions such as __builtin_popcount for 7193 counting bits, finding the highest and lowest bit in a word, and 7194 parity have been added. 7195 * The -fwritable-strings option has been deprecated and will be 7196 removed. 7197 * Many C math library functions are now recognized as built-ins and 7198 optimized. 7199 * The C, C++, and Objective-C compilers can now handle source files 7200 written in any character encoding supported by the host C library. 7201 The default input character set is taken from the current locale, 7202 and may be overridden with the -finput-charset command line option. 7203 In the future we will add support for inline encoding markers. 7204 7205 C++ 7206 7207 * G++ is now much closer to full conformance to the ISO/ANSI C++ 7208 standard. This means, among other things, that a lot of invalid 7209 constructs which used to be accepted in previous versions will now 7210 be rejected. It is very likely that existing C++ code will need to 7211 be fixed. This document lists some of the most common issues. 7212 * A hand-written recursive-descent C++ parser has replaced the 7213 YACC-derived C++ parser from previous GCC releases. The new parser 7214 contains much improved infrastructure needed for better parsing of 7215 C++ source codes, handling of extensions, and clean separation 7216 (where possible) between proper semantics analysis and parsing. The 7217 new parser fixes many bugs that were found in the old parser. 7218 * You must now use the typename and template keywords to disambiguate 7219 dependent names, as required by the C++ standard. 7220 struct K { 7221 typedef int mytype_t; 7222 }; 7223 7224 template <class T1> struct A { 7225 template <class T2> struct B { 7226 void callme(void); 7227 }; 7228 7229 template <int N> void bar(void) 7230 { 7231 // Use 'typename' to tell the parser that T1::mytype_t names 7232 // a type. This is needed because the name is dependent (in 7233 // this case, on template parameter T1). 7234 typename T1::mytype_t x; 7235 x = 0; 7236 } 7237 }; 7238 7239 template <class T> void template_func(void) 7240 { 7241 // Use 'template' to prefix member templates within 7242 // dependent types (a has type A<T>, which depends on 7243 // the template parameter T). 7244 A<T> a; 7245 a.template bar<0>(); 7246 7247 // Use 'template' to tell the parser that B is a nested 7248 // template class (dependent on template parameter T), and 7249 // 'typename' because the whole A<T>::B<int> is 7250 // the name of a type (again, dependent). 7251 typename A<T>::template B<int> b; 7252 b.callme(); 7253 } 7254 7255 void non_template_func(void) 7256 { 7257 // Outside of any template class or function, no names can be 7258 // dependent, so the use of the keyword 'typename' and 'template' 7259 // is not needed (and actually forbidden). 7260 A<K> a; 7261 a.bar<0>(); 7262 A<K>::B<float> b; 7263 b.callme(); 7264 } 7265 * In a template definition, unqualified names will no longer find 7266 members of a dependent base (as specified by [temp.dep]/3 in the 7267 C++ standard). For example, 7268 template <typename T> struct B { 7269 int m; 7270 int n; 7271 int f (); 7272 int g (); 7273 }; 7274 int n; 7275 int g (); 7276 template <typename T> struct C : B<T> { 7277 void h () 7278 { 7279 m = 0; // error 7280 f (); // error 7281 n = 0; // ::n is modified 7282 g (); // ::g is called 7283 } 7284 }; 7285 You must make the names dependent, e.g. by prefixing them with 7286 this->. Here is the corrected definition of C<T>::h, 7287 template <typename T> void C<T>::h () 7288 { 7289 this->m = 0; 7290 this->f (); 7291 this->n = 0 7292 this->g (); 7293 } 7294 As an alternative solution (unfortunately not backwards compatible 7295 with GCC 3.3), you may use using declarations instead of this->: 7296 template <typename T> struct C : B<T> { 7297 using B<T>::m; 7298 using B<T>::f; 7299 using B<T>::n; 7300 using B<T>::g; 7301 void h () 7302 { 7303 m = 0; 7304 f (); 7305 n = 0; 7306 g (); 7307 } 7308 }; 7309 * In templates, all non-dependent names are now looked up and bound 7310 at definition time (while parsing the code), instead of later when 7311 the template is instantiated. For instance: 7312 void foo(int); 7313 7314 template <int> struct A { 7315 static void bar(void){ 7316 foo('a'); 7317 } 7318 }; 7319 7320 void foo(char); 7321 7322 int main() 7323 { 7324 A<0>::bar(); // Calls foo(int), used to call foo(char). 7325 } 7326 7327 * In an explicit instantiation of a class template, you must use 7328 class or struct before the template-id: 7329 template <int N> 7330 class A {}; 7331 7332 template A<0>; // error, not accepted anymore 7333 template class A<0>; // OK 7334 * The "named return value" and "implicit typename" extensions have 7335 been removed. 7336 * Default arguments in function types have been deprecated and will 7337 be removed. 7338 * ARM-style name-injection of friend declarations has been deprecated 7339 and will be removed. For example: struct S { friend void f(); }; 7340 void g() { f(); } will not be accepted by future versions of G++; 7341 instead a declaration of "f" will need to be present outside of the 7342 scope of "S". 7343 * Covariant returns are implemented for all but varadic functions 7344 that require an adjustment. 7345 * When -pedantic is used, G++ now issues errors about spurious 7346 semicolons. For example, 7347 namespace N {}; // Invalid semicolon. 7348 void f() {}; // Invalid semicolon. 7349 * G++ no longer accepts attributes for a declarator after the 7350 initializer associated with that declarator. For example, 7351 X x(1) __attribute__((...)); 7352 is no longer accepted. Instead, use: 7353 X x __attribute__((...)) (1); 7354 * Inside the scope of a template class, the name of the class itself 7355 can be treated as either a class or a template. So GCC used to 7356 accept the class name as argument of type template, and template 7357 template parameter. However this is not C++ standard compliant. Now 7358 the name is not treated as a valid template template argument 7359 unless you qualify the name by its scope. For example, the code 7360 below no longer compiles. 7361 template <template <class> class TT> class X {}; 7362 template <class T> class Y { 7363 X<Y> x; // Invalid, Y is always a type template parameter. 7364 }; 7365 The valid code for the above example is 7366 X< ::Y> x; // Valid. 7367 (Notice the space between < and : to prevent GCC to interpret this 7368 as a digraph for [.) 7369 * Friend declarations that refer to template specializations are 7370 rejected if the template has not already been declared. For 7371 example, 7372 template <typename T> 7373 class C { 7374 friend void f<> (C&); 7375 }; 7376 is rejected. You must first declare f as a template, 7377 template <typename T> 7378 void f(T); 7379 * In case of friend declarations, every name used in the friend 7380 declaration must be accessible at the point of that declaration. 7381 Previous versions of G++ used to be less strict about this and 7382 allowed friend declarations for private class members, for example. 7383 See the ISO C++ Standard Committee's [11]defect report #209 for 7384 details. 7385 * Declaration of member functions of class templates as friends are 7386 supported. For example, 7387 template <typename T> struct A { 7388 void f(); 7389 }; 7390 class C { 7391 template <typename T> friend void A<T>::f(); 7392 }; 7393 * You must use template <> to introduce template specializations, as 7394 required by the standard. For example, 7395 template <typename T> 7396 struct S; 7397 7398 struct S<int> { }; 7399 is rejected. You must write, 7400 template <> struct S<int> {}; 7401 * G++ used to accept code like this, 7402 struct S { 7403 int h(); 7404 void f(int i = g()); 7405 int g(int i = h()); 7406 }; 7407 This behavior is not mandated by the standard. Now G++ issues an 7408 error about this code. To avoid the error, you must move the 7409 declaration of g before the declaration of f. The default arguments 7410 for g must be visible at the point where it is called. 7411 * The C++ ABI Section 3.3.3 specifications for the array construction 7412 routines __cxa_vec_new2 and __cxa_vec_new3 were changed to return 7413 NULL when the allocator argument returns NULL. These changes are 7414 incorporated into the libstdc++ runtime library. 7415 * Using a name introduced by a typedef in a friend declaration or in 7416 an explicit instantiation is now rejected, as specified by the ISO 7417 C++ standard. 7418 class A; 7419 typedef A B; 7420 class C { 7421 friend class B; // error, no typedef name here 7422 friend B; // error, friend always needs class/struct/enum 7423 friend class A; // OK 7424 }; 7425 7426 template <int> class Q {}; 7427 typedef Q<0> R; 7428 template class R; // error, no typedef name here 7429 template class Q<0>; // OK 7430 * When allocating an array with a new expression, GCC used to allow 7431 parentheses around the type name. This is actually ill-formed and 7432 it is now rejected: 7433 int* a = new (int)[10]; // error, not accepted anymore 7434 int* a = new int[10]; // OK 7435 * When binding an rvalue of class type to a reference, the copy 7436 constructor of the class must be accessible. For instance, consider 7437 the following code: 7438 class A 7439 { 7440 public: 7441 A(); 7442 7443 private: 7444 A(const A&); // private copy ctor 7445 }; 7446 7447 A makeA(void); 7448 void foo(const A&); 7449 7450 void bar(void) 7451 { 7452 foo(A()); // error, copy ctor is not accessible 7453 foo(makeA()); // error, copy ctor is not accessible 7454 7455 A a1; 7456 foo(a1); // OK, a1 is a lvalue 7457 } 7458 This might be surprising at first sight, especially since most 7459 popular compilers do not correctly implement this rule ([12]further 7460 details). 7461 * When forming a pointer to member or a pointer to member function, 7462 access checks for class visibility (public, protected, private) are 7463 now performed using the qualifying scope of the name itself. This 7464 is better explained with an example: 7465 class A 7466 { 7467 public: 7468 void pub_func(); 7469 protected: 7470 void prot_func(); 7471 private: 7472 void priv_func(); 7473 }; 7474 7475 class B : public A 7476 { 7477 public: 7478 void foo() 7479 { 7480 &A::pub_func; // OK, pub_func is accessible through A 7481 &A::prot_func; // error, cannot access prot_func through A 7482 &A::priv_func; // error, cannot access priv_func through A 7483 7484 &B::pub_func; // OK, pub_func is accessible through B 7485 &B::prot_func; // OK, can access prot_func through B (within B) 7486 &B::priv_func; // error, cannot access priv_func through B 7487 } 7488 }; 7489 7490 Runtime Library (libstdc++) 7491 7492 * Optimization work: 7493 + Streamlined streambuf, filebuf, separate synched with C 7494 Standard I/O streambuf. 7495 + All formatted I/O now uses cached locale information. 7496 + STL optimizations (memory/speed for list, red-black trees as 7497 used by sets and maps). 7498 + More use of GCC builtins. 7499 + String optimizations (avoid contention on 7500 increment/decrement-and-test of the reference count in the 7501 empty-string object, constructor from input_iterators 7502 speedup). 7503 * Static linkage size reductions. 7504 * Large File Support (files larger than 2 GB on 32-bit systems). 7505 * Wide character and variable encoding filebuf work (UTF-8, Unicode). 7506 * Generic character traits. 7507 * Also support wchar_t specializations on Mac OS 10.3.x, FreeBSD 5.x, 7508 Solaris 2.7 and above, AIX 5.x, Irix 6.5. 7509 * The allocator class is now standard-conformant, and two additional 7510 extension allocators have been added, mt_alloc and 7511 bitmap_allocator. 7512 * PCH support: -include bits/stdc++.h (2x compile speedup). 7513 * Rewrote __cxa_demangle with support for C++ style allocators. 7514 * New debug modes for STL containers and iterators. 7515 * Testsuite rewrite: five times as many tests, plus increasingly 7516 sophisticated tests, including I/O, MT, multi-locale, wide and 7517 narrow characters. 7518 * Use current versions of GNU "autotools" for build/configuration. 7519 7520 Objective-C 7521 7522 * The Objective-C front end has been updated to include the numerous 7523 bug fixes and enhancements previously available only in Apple's 7524 version of GCC. These include: 7525 + Structured exception (@try... @catch... @finally, @throw) and 7526 synchronization (@synchronized) support. These are accessible 7527 via the -fobjc-exceptions switch; as of this writing, they may 7528 only be used in conjunction with -fnext-runtime on Mac OS X 7529 10.3 and later. See [13]Options Controlling Objective-C 7530 Dialect for more information. 7531 + An overhaul of @encode logic. The C99 _Bool and C++ bool type 7532 may now be encoded as 'B'. In addition, the back-end/codegen 7533 dependencies have been removed. 7534 + An overhaul of message dispatch construction, ensuring that 7535 the various receiver types (and casts thereof) are handled 7536 properly, and that correct diagnostics are issued. 7537 + Support for "Zero-Link" (-fzero-link) and "Fix-and-Continue" 7538 (-freplace-objc-classes) debugging modes, currently available 7539 on Mac OS X 10.3 and later. See [14]Options Controlling 7540 Objective-C Dialect for more information. 7541 + Access to optimized runtime entry points (-fno-nil-receivers ) 7542 on the assumption that message receivers are never nil. This 7543 is currently available on Mac OS X 10.3 and later. See 7544 [15]Options Controlling Objective-C Dialect for more 7545 information. 7546 7547 Java 7548 7549 * Compiling a .jar file will now cause non-.class entries to be 7550 automatically compiled as resources. 7551 * libgcj has been ported to Darwin. 7552 * Jeff Sturm has adapted Jan Hubicka's call graph optimization code 7553 to gcj. 7554 * libgcj has a new gcjlib URL type; this lets URLClassLoader load 7555 code from shared libraries. 7556 * libgcj has been much more completely merged with [16]GNU Classpath. 7557 * Class loading is now much more correct; in particular the caller's 7558 class loader is now used when that is required. 7559 * [17]Eclipse 2.x will run out of the box using gij. 7560 * Parts of java.nio have been implemented. Direct and indirect 7561 buffers work, as do fundamental file and socket operations. 7562 * java.awt has been improved, though it is still not ready for 7563 general use. 7564 * The HTTP protocol handler now uses HTTP/1.1 and can handle the POST 7565 method. 7566 * The MinGW port has matured. Enhancements include socket timeout 7567 support, thread interruption, improved Runtime.exec() handling and 7568 support for accented characters in filenames. 7569 7570 Fortran 7571 7572 * Fortran improvements are listed in the [18]Fortran documentation. 7573 7574 New Targets and Target Specific Improvements 7575 7576 Alpha 7577 7578 * Several [19]built-in functions have been added such as 7579 __builtin_alpha_zap to allow utilizing the more obscure 7580 instructions of the CPU. 7581 * Parameter passing of complex arguments has changed to match the 7582 [20]ABI. This change is incompatible with previous GCC versions, 7583 but does fix compatibility with the Tru64 compiler and several 7584 corner cases where GCC was incompatible with itself. 7585 7586 ARM 7587 7588 * Nicolas Pitre has contributed his hand-coded floating-point support 7589 code for ARM. It is both significantly smaller and faster than the 7590 existing C-based implementation, even when building applications 7591 for Thumb. The arm-elf configuration has been converted to use the 7592 new code. 7593 * Support for the Intel's iWMMXt architecture, a second generation 7594 XScale processor, has been added. Enabled at run time with the 7595 -mcpu=iwmmxt command line switch. 7596 * A new ARM target has been added: arm-wince-pe. This is similar to 7597 the arm-pe target, but it defaults to using the APCS32 ABI. 7598 * The existing ARM pipeline description has been converted to the use 7599 the [21]DFA processor pipeline model. There is not much change in 7600 code performance, but the description is now [22]easier to 7601 understand. 7602 * Support for the Cirrus EP9312 Maverick floating point co-processor 7603 added. Enabled at run time with the -mcpu=ep9312 command line 7604 switch. Note however that the multilibs to support this chip are 7605 currently disabled in gcc/config/arm/t-arm-elf, so if you want to 7606 enable their production you will have to uncomment the entries in 7607 that file. 7608 7609 H8/300 7610 7611 * Support for long long has been added. 7612 * Support for saveall attribute has been added. 7613 * Pavel Pisa contributed hand-written 32-bit-by-32-bit division code 7614 for H8/300H and H8S, which is much faster than the previous 7615 implementation. 7616 * A lot of small performance improvements. 7617 7618 IA-32/AMD64 (x86-64) 7619 7620 * Tuning for K8 (AMD Opteron/Athlon64) core is available via 7621 -march=k8 and -mcpu=k8. 7622 * Scalar SSE code generation carefully avoids reformatting penalties, 7623 hidden dependencies and minimizes the number of uops generated on 7624 both Intel and AMD CPUs. 7625 * Vector MMX and SSE operands are now passed in registers to improve 7626 performance and match the argument passing convention used by the 7627 Intel C++ Compiler. As a result it is not possible to call 7628 functions accepting vector arguments compiled by older GCC version. 7629 * Conditional jump elimination is now more aggressive on modern CPUs. 7630 * The Athlon ports has been converted to use the DFA processor 7631 pipeline description. 7632 * Optimization of indirect tail calls is now possible in a similar 7633 fashion as direct sibcall optimization. 7634 * Further small performance improvements. 7635 * -m128bit-long-double is now less buggy. 7636 * __float128 support in 64-bit compilation. 7637 * Support for data structures exceeding 2GB in 64-bit mode. 7638 * -mcpu has been renamed to -mtune. 7639 7640 IA-64 7641 7642 * Tuning code for the Itanium 2 processor has been added. The 7643 generation of code tuned for Itanium 2 (option -mtune=itanium2) is 7644 enabled by default now. To generate code tuned for Itanium 1 the 7645 option -mtune=itanium1 should be used. 7646 * [23]DFA processor pipeline descriptions for the IA-64 processors 7647 have been added. This resulted in about 3% improvement on the 7648 SPECInt2000 benchmark for Itanium 2. 7649 * Instruction bundling for the IA-64 processors has been rewritten 7650 using the DFA pipeline hazard recognizer. It resulted in about 60% 7651 compiler speedup on the SPECInt2000 C programs. 7652 7653 M32R 7654 7655 * Support for the M32R/2 processor has been added by Renesas. 7656 * Support for an M32R GNU/Linux target and PIC code generation has 7657 been added by Renesas. 7658 7659 M68000 7660 7661 * Bernardo Innocenti (Develer S.r.l.) has contributed the 7662 m68k-uclinux target, based on former work done by Paul Dale 7663 (SnapGear Inc.). Code generation for the ColdFire processors family 7664 has been enhanced and extended to support the MCF 53xx and MCF 54xx 7665 cores, integrating former work done by Peter Barada (Motorola). 7666 7667 MIPS 7668 7669 Processor-specific changes 7670 7671 * Support for the RM7000 and RM9000 processors has been added. It can 7672 be selected using the -march compiler option and should work with 7673 any MIPS I (mips-*) or MIPS III (mips64-*) configuration. 7674 * Support for revision 2 of the MIPS32 ISA has been added. It can be 7675 selected with the command-line option -march=mips32r2. 7676 * There is a new option, -mfix-sb1, to work around certain SB-1 7677 errata. 7678 7679 Configuration 7680 7681 * It is possible to customize GCC using the following configure-time 7682 options: 7683 + --with-arch, which specifies the default value of the -march 7684 option. 7685 + --with-tune, which specifies the default value of the -mtune 7686 option. 7687 + --with-abi, which specifies the default ABI. 7688 + --with-float=soft, which tells GCC to use software floating 7689 point by default. 7690 + --with-float=hard, which tells GCC to use hardware floating 7691 point by default. 7692 * A 64-bit GNU/Linux port has been added. The associated 7693 configurations are mips64-linux-gnu and mips64el-linux-gnu. 7694 * The 32-bit GNU/Linux port now supports Java. 7695 * The IRIX 6 configuration now supports the o32 ABI and will build 7696 o32 multilibs by default. This support is compatible with both 7697 binutils and the SGI tools, but note that several features, 7698 including debugging information and DWARF2 exception handling, are 7699 only available when using the GNU assembler. Use of the GNU 7700 assembler and linker (version 2.15 or above) is strongly 7701 recommended. 7702 * The IRIX 6 configuration now supports 128-bit long doubles. 7703 * There are two new RTEMS-specific configurations, mips-rtems and 7704 mipsel-rtems. 7705 * There are two new *-elf configurations, mipsisa32r2-elf and 7706 mipsisa32r2el-elf. 7707 7708 General 7709 7710 * Several [24]ABI bugs have been fixed. Unfortunately, these changes 7711 will break binary compatibility with earlier releases. 7712 * GCC can now use explicit relocation operators when generating 7713 -mabicalls code. This behavior is controlled by -mexplicit-relocs 7714 and can have several performance benefits. For example: 7715 + It allows for more optimization of GOT accesses, including 7716 better scheduling and redundancy elimination. 7717 + It allows sibling calls to be implemented as jumps. 7718 + n32 and n64 leaf functions can use a call-clobbered global 7719 pointer instead of $28. 7720 + The code to set up $gp can be removed from functions that 7721 don't need it. 7722 * A new option, -mxgot, allows the GOT to be bigger than 64k. This 7723 option is equivalent to the assembler's -xgot option and should be 7724 used instead of -Wa,-xgot. 7725 * Frame pointer elimination is now supported when generating 64-bit 7726 MIPS16 code. 7727 * Inline block moves have been optimized to take more account of 7728 alignment information. 7729 * Many internal changes have been made to the MIPS port, mostly aimed 7730 at reducing the reliance on assembler macros. 7731 7732 PowerPC 7733 7734 * GCC 3.4 releases have a number of fixes for PowerPC and PowerPC64 7735 [25]ABI incompatibilities regarding the way parameters are passed 7736 during functions calls. These changes may result in incompatibility 7737 between code compiled with GCC 3.3 and GCC 3.4. 7738 7739 PowerPC Darwin 7740 7741 * Support for shared/dylib gcc libraries has been added. It is 7742 enabled by default on powerpc-apple-darwin7.0.0 and up. 7743 * Libgcj is enabled by default. On systems older than 7744 powerpc-apple-darwin7.0.0 you need to install dlcompat. 7745 * 128-bit IBM extended precision format support added for long 7746 double. 7747 7748 PowerPC64 GNU/Linux 7749 7750 * By default, PowerPC64 GNU/Linux now uses natural alignment of 7751 structure elements. The old four byte alignment for double, with 7752 special rules for a struct starting with a double, can be chosen 7753 with -malign-power. This change may result in incompatibility 7754 between code compiled with GCC 3.3 and GCC 3.4. 7755 * -mabi=altivec is now the default rather than -mabi=no-altivec. 7756 * 128-bit IBM extended precision format support added for long 7757 double. 7758 7759 S/390 and zSeries 7760 7761 * New command-line options allow to specify the intended execution 7762 environment for generated code: 7763 + -mesa/-mzarch allows to specify whether to generate code 7764 running in ESA/390 mode or in z/Architecture mode (this is 7765 applicable to 31-bit code only). 7766 + -march allows to specify a minimum processor architecture 7767 level (g5, g6, z900, or z990). 7768 + -mtune allows to specify which processor to tune for. 7769 * It is possible to customize GCC using the following configure-time 7770 options: 7771 + --with-mode, which specifies whether to default to assuming 7772 ESA/390 or z/Architecture mode. 7773 + --with-arch, which specifies the default value of the -march 7774 option. 7775 + --with-tune, which specifies the default value of the -mtune 7776 option. 7777 * Support for the z990 processor has been added, and can be selected 7778 using -march=z990 or -mtune=z990. This includes instruction 7779 scheduling tuned for the superscalar instruction pipeline of the 7780 z990 processor as well as support for all new instructions provided 7781 by the long-displacement facility. 7782 * Support to generate 31-bit code optimized for zSeries processors 7783 (running in ESA/390 or in z/Architecture mode) has been added. This 7784 can be selected using -march=z900 and -mzarch respectively. 7785 * Instruction scheduling for the z900 and z990 processors now uses 7786 the DFA pipeline hazard recognizer. 7787 * GCC no longer generates code to maintain a stack backchain, 7788 previously used to generate stack backtraces for debugging 7789 purposes. As replacement that does not incur runtime overhead, 7790 DWARF-2 call frame information is provided by GCC; this is 7791 supported by GDB 6.1. The old behavior can be restored using the 7792 -mbackchain option. 7793 * The stack frame size of functions may now exceed 2 GB in 64-bit 7794 code. 7795 * A port for the 64-bit IBM TPF operating system has been added; the 7796 configuration is s390x-ibm-tpf. This configuration is supported as 7797 cross-compilation target only. 7798 * Various changes to improve the generated code have been 7799 implemented, including: 7800 + GCC now uses the MULTIPLY AND ADD and MULTIPLY AND SUBTRACT 7801 instructions to significantly speed up many floating-point 7802 applications. 7803 + GCC now uses the ADD LOGICAL WITH CARRY and SUBTRACT LOGICAL 7804 WITH BORROW instructions to speed up long long arithmetic. 7805 + GCC now uses the SEARCH STRING instruction to implement 7806 strlen(). 7807 + In many cases, function call overhead for 31-bit code has been 7808 reduced by placing the literal pool after the function code 7809 instead of after the function prolog. 7810 + Register 14 is no longer reserved in 64-bit code. 7811 + Handling of global register variables has been improved. 7812 7813 SPARC 7814 7815 * The option -mflat is deprecated. 7816 * Support for large (> 2GB) frames has been added to the 64-bit port. 7817 * Several [26]ABI bugs have been fixed. Unfortunately, these changes 7818 will break binary compatibility with earlier releases. 7819 * The default debugging format has been switched from STABS to 7820 DWARF-2 for 32-bit code on Solaris 7 and later. DWARF-2 is already 7821 the default debugging format for 64-bit code on Solaris. 7822 7823 SuperH 7824 7825 * Support for the SH2E processor has been added. Enabled at run time 7826 with the -m2e command line switch, or at configure time by 7827 specifying sh2e as the machine part of the target triple. 7828 7829 V850 7830 7831 * Support for the Mitsubishi V850E1 processor has been added. This is 7832 a variant of the V850E processor with some additional debugging 7833 instructions. 7834 7835 Xtensa 7836 7837 * Several ABI bugs have been fixed. Unfortunately, these changes 7838 break binary compatibility with earlier releases. 7839 + For big-endian processors, the padding of aggregate return 7840 values larger than a word has changed. If the size of an 7841 aggregate return value is not a multiple of 32 bits, previous 7842 versions of GCC inserted padding in the most-significant bytes 7843 of the first return value register. Aggregates larger than a 7844 word are now padded in the least-significant bytes of the last 7845 return value register used. Aggregates smaller than a word are 7846 still padded in the most-significant bytes. The return value 7847 padding has not changed for little-endian processors. 7848 + Function arguments with 16-byte alignment are now properly 7849 aligned. 7850 + The implementation of the va_list type has changed. A va_list 7851 value created by va_start from a previous release cannot be 7852 used with va_arg from this release, or vice versa. 7853 * More processor configuration options for Xtensa processors are 7854 supported: 7855 + the ABS instruction is now optional; 7856 + the ADDX* and SUBX* instructions are now optional; 7857 + an experimental CONST16 instruction can be used to synthesize 7858 constants instead of loading them from constant pools. 7859 These and other Xtensa processor configuration options can no 7860 longer be enabled or disabled by command-line options; the 7861 processor configuration must be specified by the xtensa-config.h 7862 header file when building GCC. Additionally, the 7863 -mno-serialize-volatile option is no longer supported. 7864 7865 Obsolete Systems 7866 7867 Support for a number of older systems has been declared obsolete in GCC 7868 3.4. Unless there is activity to revive them, the next release of GCC 7869 will have their sources permanently removed. 7870 7871 All configurations of the following processor architectures have been 7872 declared obsolete: 7873 * Mitsubishi D30V, d30v-* 7874 * AT&T DSP1600 and DSP1610, dsp16xx-* 7875 * Intel 80960, i960 7876 7877 Also, some individual systems have been obsoleted: 7878 * ARM Family 7879 + Support for generating code for operation in APCS/26 mode 7880 (-mapcs-26). 7881 * IBM ESA/390 7882 + "Bigfoot" port, i370-*. (The other port, s390-*, is actively 7883 maintained and supported.) 7884 * Intel 386 family 7885 + MOSS, i?86-moss-msdos and i?86-*-moss* 7886 + NCR 3000 running System V r.4, i?86-ncr-sysv4* 7887 + FreeBSD with a.out object format, i?86-*-freebsd*aout* and 7888 i?86-*-freebsd2* 7889 + GNU/Linux with a.out object format, i?86-linux*aout* 7890 + GNU/Linux with libc5, a.k.a. glibc1, i?86-linux*libc1* 7891 + Interix versions before Interix 3, i?86-*-interix 7892 + Mach microkernel, i?86-mach* 7893 + SCO UnixWare with UDK, i?86-*-udk* 7894 + Generic System V releases 1, 2, and 3, i?86-*-sysv[123]* 7895 + VSTa microkernel, i386-*-vsta 7896 * Motorola M68000 family 7897 + HPUX, m68k-hp-hpux* and m68000-hp-hpux* 7898 + NetBSD with a.out object format (before NetBSD 1.4), 7899 m68k-*-*-netbsd* except m68k-*-*-netbsdelf* 7900 + Generic System V r.4, m68k-*-sysv4* 7901 * VAX 7902 + Generic VAX, vax-*-* (This is generic VAX only; we have not 7903 obsoleted any VAX triples for specific operating systems.) 7904 7905 Documentation improvements 7906 7907 Other significant improvements 7908 7909 * The build system has undergone several significant cleanups. 7910 Subdirectories will only be configured if they are being built, and 7911 all subdirectory configures are run from the make command. The top 7912 level has been autoconfiscated. 7913 * Building GCC no longer writes to its source directory. This should 7914 help those wishing to share a read-only source directory over NFS 7915 or build from a CD. The exceptions to this feature are if you 7916 configure with either --enable-maintainer-mode or 7917 --enable-generated-files-in-srcdir. 7918 * The -W warning option has been renamed to -Wextra, which is more 7919 easily understood. The older spelling will be retained for 7920 backwards compatibility. 7921 * Substantial improvements in compile time have been made, 7922 particularly for non-optimizing compilations. 7923 __________________________________________________________________ 7924 7925 GCC 3.4.0 7926 7927 Bug Fixes 7928 7929 A vast number of bugs have been fixed in 3.4.0, too many to publish a 7930 complete list here. [27]Follow this link to query the Bugzilla database 7931 for the list of over 900 bugs fixed in 3.4.0. This is the list of all 7932 bugs marked as resolved and fixed in 3.4.0 that are not flagged as 3.4 7933 regressions. 7934 __________________________________________________________________ 7935 7936 GCC 3.4.1 7937 7938 Bug Fixes 7939 7940 This section lists the problem reports (PRs) from GCC's bug tracking 7941 system that are known to be fixed in the 3.4.1 release. This list might 7942 not be complete (that is, it is possible that some PRs that have been 7943 fixed are not listed here). 7944 7945 Bootstrap failures 7946 7947 * [28]10129 Ada bootstrap fails on PPC-Darwin - invalid assembler 7948 emitted - PIC related 7949 * [29]14576 [ARM] ICE in libiberty when building gcc-3.4 for arm-elf 7950 * [30]14760 A bug in configure.in prevents using both 7951 --program-suffix and --program-prefix 7952 * [31]14671 [hppa64] bootstrap fails: ICE in 7953 save_call_clobbered_regs, in caller_save.c 7954 * [32]15093 [alpha][Java] make bootstrap fails to configure libffi on 7955 Alpha 7956 * [33]15178 Solaris 9/x86 fails linking after stage 3 7957 7958 Multi-platform internal compiler errors (ICEs) 7959 7960 * [34]12753 (preprocessor) Memory corruption in preprocessor on bad 7961 input 7962 * [35]13985 ICE in gcc.c-torture/compile/930621-1.c 7963 * [36]14810 (c++) tree check failures with invalid code involving 7964 templates 7965 * [37]14883 (c++) ICE on invalid code, in cp_parser_lookup_name, in 7966 cp/parser.c 7967 * [38]15044 (c++) ICE on syntax error, template header 7968 * [39]15057 (c++) Compiling of conditional value throw constructs 7969 cause a segmentation violation 7970 * [40]15064 (c++) typeid of template parameter gives ICE 7971 * [41]15142 (c++) ICE when passing a string where a char* is expected 7972 in a throw statement 7973 * [42]15159 ICE in rtl_verify_flow_info_1 7974 * [43]15165 (c++) ICE in instantiate_template 7975 * [44]15193 Unary minus using pointer to V4SF vector causes 7976 -fforce-mem to exhaust all memory 7977 * [45]15209 (c++) Runs out of memory with packed structs 7978 * [46]15227 (c++) Trouble with invalid function definition 7979 * [47]15285 (c++) instantiate_type ICE when forming pointer to 7980 template function 7981 * [48]15299 (c++) ICE in resolve_overloaded_unification 7982 * [49]15329 (c++) ICE on constructor of member template 7983 * [50]15550 ICE in extract_insn, in recog.c 7984 * [51]15554 (c++) ICE in tsubst_copy, in cp/pt.c 7985 * [52]15640 (c++) ICE on invalid code in arg_assoc, in 7986 cp/name-lookup.c 7987 * [53]15666 [unit-at-a-time] Gcc abort on valid code 7988 * [54]15696 (c++) ICE with bad pointer-to-member code 7989 * [55]15701 (c++) ICE with friends and template template parameter 7990 * [56]15761 ICE in do_SUBST, in combine.c 7991 * [57]15829 (c++) ICE on Botan-1.3.13 due to -funroll-loops 7992 7993 Ada 7994 7995 * [58]14538 All RTEMS targets broken for gnat 7996 7997 C front end 7998 7999 * [59]12391 missing warning about assigning to an incomplete type 8000 * [60]14649 atan(1.0) should not be a constant expression 8001 * [61]15004 [unit-at-a-time] no warning for unused paramater in 8002 static function 8003 * [62]15749 --pedantic-errors behaves differently from --pedantic 8004 with C-compiler on GNU/Linux 8005 8006 C++ compiler and library 8007 8008 * [63]10646 non-const reference is incorrectly matched in a "const T" 8009 partial specialization 8010 * [64]12077 wcin.rdbuf()->in_avail() return value too high 8011 * [65]13598 enc_filebuf doesn't work 8012 * [66]14211 const_cast returns lvalue but should be rvalue 8013 * [67]14220 num_put::do_put() undesired float/double behavior 8014 * [68]14245 problem with user-defined allocators in std::basic_string 8015 * [69]14340 libstdc++ Debug mode: failure to convert iterator to 8016 const_iterator 8017 * [70]14600 __gnu_cxx::stdio_sync_filebuf should expose internal 8018 FILE* 8019 * [71]14668 no warning anymore for reevaluation of declaration 8020 * [72]14775 LFS (large file support) tests missing 8021 * [73]14821 Duplicate namespace alias declaration should not conflict 8022 * [74]14930 Friend declaration ignored 8023 * [75]14932 cannot use offsetof to get offsets of array elements in 8024 g++ 3.4.0 8025 * [76]14950 [non unit-at-a-time] always_inline does not mix with 8026 templates and -O0 8027 * [77]14962 g++ ignores #pragma redefine_extname 8028 * [78]14975 Segfault on low-level write error during imbue 8029 * [79]15002 Linewise stream input is unusably slow (std::string slow) 8030 * [80]15025 compiler accepts redeclaration of template as 8031 non-template 8032 * [81]15046 [arm] Math functions misdetected by cross configuration 8033 * [82]15069 a bit test on a variable of enum type is miscompiled 8034 * [83]15074 g++ -lsupc++ still links against libstdc++ 8035 * [84]15083 spurious "statement has no effect" warning 8036 * [85]15096 parse error with templates and pointer to const member 8037 * [86]15287 combination of operator[] and operator .* fails in 8038 templates 8039 * [87]15317 __attribute__ unused in first parameter of constructor 8040 gives error 8041 * [88]15337 sizeof on incomplete type diagnostic 8042 * [89]15361 bitset<>::_Find_next fails 8043 * [90]15412 _GLIBCXX_ symbols symbols defined and used in different 8044 namespaces 8045 * [91]15427 valid code results in incomplete type error 8046 * [92]15471 Incorrect member pointer offsets in anonymous 8047 structs/unions 8048 * [93]15503 nested template problem 8049 * [94]15507 compiler hangs while laying out union 8050 * [95]15542 operator & and template definitions 8051 * [96]15565 SLES9: leading + sign for unsigned int with showpos 8052 * [97]15625 friend defined inside a template fails to find static 8053 function 8054 * [98]15629 Function templates, overloads, and friend name injection 8055 * [99]15742 'noreturn' attribute ignored in method of template 8056 functions. 8057 * [100]15775 Allocator::pointer consistently ignored 8058 * [101]15821 Duplicate namespace alias within namespace rejected 8059 * [102]15862 'enum yn' fails (confict with undeclared builtin) 8060 * [103]15875 rejects pointer to member in template 8061 * [104]15877 valid code using templates and anonymous enums is 8062 rejected 8063 * [105]15947 Puzzling error message for wrong destructor declaration 8064 in template class 8065 * [106]16020 cannot copy __gnu_debug::bitset 8066 * [107]16154 input iterator concept too restrictive 8067 * [108]16174 deducing top-level consts 8068 8069 Java 8070 8071 * [109]14315 Java compiler is not parallel make safe 8072 8073 Fortran 8074 8075 * [110]15151 [g77] incorrect logical i/o in 64-bit mode 8076 8077 Objective-C 8078 8079 * [111]7993 private variables cannot be shadowed in subclasses 8080 8081 Optimization bugs 8082 8083 * [112]15228 useless copies of floating point operands 8084 * [113]15345 [non-unit-at-a-time] unreferenced nested inline 8085 functions not optimized away 8086 * [114]15945 Incorrect floating point optimization 8087 * [115]15526 ftrapv aborts on 0 * (-1) 8088 * [116]14690 Miscompiled POOMA tests 8089 * [117]15112 GCC generates code to write to unchanging memory 8090 8091 Preprocessor 8092 8093 * [118]15067 Minor glitch in the source of cpp 8094 8095 Main driver program bugs 8096 8097 * [119]1963 collect2 interprets -oldstyle_liblookup as -o 8098 ldstyle_liblookup 8099 8100 x86-specific (Intel/AMD) 8101 8102 * [120]15717 Error: can't resolve `L0' {*ABS* section} - `xx' {*UND* 8103 section} 8104 8105 HPPA-specific 8106 8107 * [121]14782 GCC produces an unaligned data access at -O2 8108 * [122]14828 FAIL: gcc.c-torture/execute/20030408-1.c execution, -O2 8109 * [123]15202 ICE in reload_cse_simplify_operands, in postreload.c 8110 8111 IA64-specific 8112 8113 * [124]14610 __float80 constants incorrectly emitted 8114 * [125]14813 init_array sections are initialized in the wrong order 8115 * [126]14857 GCC segfault on duplicated asm statement 8116 * [127]15598 Gcc 3.4 ICE on valid code 8117 * [128]15653 Gcc 3.4 ICE on valid code 8118 8119 MIPS-specific 8120 8121 * [129]15189 wrong filling of delay slot with -march=mips1 -G0 8122 -mno-split-addresses -mno-explicit-relocs 8123 * [130]15331 Assembler error building gnatlib on IRIX 6.5 with GNU as 8124 2.14.91 8125 * [131]16144 Bogus reference to __divdf3 when -O1 8126 * [132]16176 Miscompilation of unaligned data in MIPS backend 8127 8128 PowerPC-specific 8129 8130 * [133]11591 ICE in gcc.dg/altivec-5.c 8131 * [134]12028 powerpc-eabispe produces bad sCOND operation 8132 * [135]14478 rs6000 geu/ltu patterns generate incorrect code 8133 * [136]14567 long double and va_arg complex args 8134 * [137]14715 Altivec stack layout may overlap gpr save with stack 8135 temps 8136 * [138]14902 (libstdc++) Stream checking functions fail when -pthread 8137 option is used. 8138 * [139]14924 Compiler ICE on valid code 8139 * [140]14960 -maltivec affects vector return with -mabi=no-altivec 8140 * [141]15106 vector varargs failure passing from altivec to 8141 non-altivec code for -m32 8142 * [142]16026 ICE in function.c:4804, assign_parms, when -mpowerpc64 & 8143 half-word operation 8144 * [143]15191 -maltivec -mabi=no-altivec results in mis-aligned lvx 8145 and stvx 8146 * [144]15662 Segmentation fault when an exception is thrown - even if 8147 try and catch are specified 8148 8149 s390-specific 8150 8151 * [145]15054 Bad code due to overlapping stack temporaries 8152 8153 SPARC-specific 8154 8155 * [146]15783 ICE with union assignment in 64-bit mode 8156 * [147]15626 GCC 3.4 emits "ld: warning: relocation error: 8157 R_SPARC_UA32" 8158 8159 x86-64-specific 8160 8161 * [148]14326 boehm-gc hardcodes to 3DNow! prefetch for x86_64 8162 * [149]14723 Backported -march=nocona from mainline 8163 * [150]15290 __float128 failed to pass to function properly 8164 8165 Cygwin/Mingw32-specific 8166 8167 * [151]15250 Option -mms-bitfields support on GCC 3.4 is not 8168 conformant to MS layout 8169 * [152]15551 -mtune=pentium4 -O2 with sjlj EH breaks stack probe 8170 worker on windows32 targets 8171 8172 Bugs specific to embedded processors 8173 8174 * [153]8309 [m68k] -m5200 produces erroneous SImode set of short 8175 varaible on stack 8176 * [154]13250 [SH] Gcc code for rotation clobbers the register, but 8177 gcc continues to use the register as if it was not clobbered 8178 * [155]13803 [coldfire] movqi operand constraints too restrictivefor 8179 TARGET_COLDFIRE 8180 * [156]14093 [SH] ICE for code when using -mhitachi option in SH 8181 * [157]14457 [m6811hc] ICE with simple c++ source 8182 * [158]14542 [m6811hc] ICE on simple source 8183 * [159]15100 [SH] cc1plus got hang-up on 8184 libstdc++-v3/testsuite/abi_check.cc 8185 * [160]15296 [CRIS] Delayed branch scheduling causing invalid code on 8186 cris-* 8187 * [161]15396 [SH] ICE with -O2 -fPIC 8188 * [162]15782 [coldfire] m68k_output_mi_thunk emits wrong code for 8189 ColdFire 8190 8191 Testsuite problems (compiler not affected) 8192 8193 * [163]11610 libstdc++ testcases 27_io/* don't work properly remotely 8194 * [164]15488 (libstdc++) possibly insufficient file permissions for 8195 executing test suite 8196 * [165]15489 (libstdc++) testsuite_files determined incorrectly 8197 8198 Documentation bugs 8199 8200 * [166]13928 (libstdc++) no whatis info in some man pages generated 8201 by doxygen 8202 * [167]14150 Ada documentation out of date 8203 * [168]14949 (c++) Need to document method visibility changes 8204 * [169]15123 libstdc++-doc: Allocators.3 manpage is empty 8205 __________________________________________________________________ 8206 8207 GCC 3.4.2 8208 8209 Bug Fixes 8210 8211 This section lists the problem reports (PRs) from GCC's bug tracking 8212 system that are known to be fixed in the 3.4.2 release. This list might 8213 not be complete (that is, it is possible that some PRs that have been 8214 fixed are not listed here). 8215 8216 Bootstrap failures and issues 8217 8218 * [170]16469 [mips-sgi-irix5.3] bootstrap fails in 8219 libstdc++-v3/testsuite 8220 * [171]16344 [hppa-linux-gnu] libstdc++'s PCH built by 8221 profiledbootstrap does not work with the built compiler 8222 * [172]16842 [Solaris/x86] mkheaders can not find mkheaders.conf 8223 8224 Multi-platform internal compiler errors (ICEs) 8225 8226 * [173]12608 (c++) ICE: expected class 't', have 'x' (error_mark) in 8227 cp_parser_class_specifier, in cp/parser.c 8228 * [174]14492 ICE in loc_descriptor_from_tree, in dwarf2out.c 8229 * [175]15461 (c++) ICE due to NRV and inlining 8230 * [176]15890 (c++) ICE in c_expand_expr, in c-common.c 8231 * [177]16180 ICE: segmentation fault in RTL optimization 8232 * [178]16224 (c++) ICE in write_unscoped_name (template/namespace) 8233 * [179]16408 ICE: in delete_insn, in cfgrtl.c 8234 * [180]16529 (c++) ICE for: namespace-alias shall not be declared as 8235 the name of any other entity 8236 * [181]16698 (c++) ICE with exceptions and declaration of __cxa_throw 8237 * [182]16706 (c++) ICE in finish_member_declaration, in 8238 cp/semantics.c 8239 * [183]16810 (c++) Legal C++ program with cast gives ICE in 8240 build_ptrmemfunc 8241 * [184]16851 (c++) ICE when throwing a comma expression 8242 * [185]16870 (c++) Boost.Spirit causes ICE in tsubst, in cp/pt.c 8243 * [186]16904 (c++) ICE in finish_class_member_access_expr, in 8244 cp/typeck.c 8245 * [187]16905 (c++) ICE (segfault) with exceptions 8246 * [188]16964 (c++) ICE in cp_parser_class_specifier due to 8247 redefinition 8248 * [189]17068 (c++) ICE: tree check: expected class 'd', have 'x' 8249 (identifier_node) in dependent_template_p, in cp/pt.c 8250 8251 Preprocessor bugs 8252 8253 * [190]16366 Preprocessor option -remap causes memory corruption 8254 8255 Optimization 8256 8257 * [191]15345 unreferenced nested inline functions not optimized away 8258 * [192]16590 Incorrect execution when compiling with -O2 8259 * [193]16693 Bitwise AND is lost when used within a cast to an enum 8260 of the same precision 8261 * [194]17078 Jump into if(0) substatement fails 8262 8263 Problems in generated debug information 8264 8265 * [195]13956 incorrect stabs for nested local variables 8266 8267 C front end bugs 8268 8269 * [196]16684 GCC should not warn about redundant redeclarations of 8270 built-ins 8271 8272 C++ compiler and library 8273 8274 * [197]12658 Thread safety problems in locale::global() and 8275 locale::locale() 8276 * [198]13092 g++ accepts invalid pointer-to-member conversion 8277 * [199]15320 Excessive memory consumption 8278 * [200]16246 Incorrect template argument deduction 8279 * [201]16273 Memory exhausted when using nested classes and virtual 8280 functions 8281 * [202]16401 ostringstream in gcc 3.4.x very slow for big data 8282 * [203]16411 undefined reference to 8283 __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> 8284 >::file() 8285 * [204]16489 G++ incorrectly rejects use of a null constant integral 8286 expression as a null constant pointer 8287 * [205]16618 offsetof fails with constant member 8288 * [206]16637 syntax error reported for valid input code 8289 * [207]16717 __attribute__((constructor)) broken in C++ 8290 * [208]16813 compiler error in DEBUG version of range insertion 8291 std::map::insert 8292 * [209]16853 pointer-to-member initialization from incompatible one 8293 accepted 8294 * [210]16889 ambiguity is not detected 8295 * [211]16959 Segmentation fault in ios_base::sync_with_stdio 8296 8297 Java compiler and library 8298 8299 * [212]7587 direct threaded interpreter not thread-safe 8300 * [213]16473 ServerSocket accept() leaks file descriptors 8301 * [214]16478 Hash synchronization deadlock with finalizers 8302 8303 Alpha-specific 8304 8305 * [215]10695 ICE in dwarf2out_frame_debug_expr, in dwarf2out.c 8306 * [216]16974 could not split insn (ice in final_scan_insn, in 8307 final.c) 8308 8309 x86-specific 8310 8311 * [217]16298 ICE in output_operand 8312 * [218]17113 ICE with SSE2 intrinsics 8313 8314 x86-64 specific 8315 8316 * [219]14697 libstdc++ couldn't find 32bit libgcc_s 8317 8318 MIPS-specific 8319 8320 * [220]15869 [mips64] No NOP after LW (with -mips1 -O0) 8321 * [221]16325 [mips64] value profiling clobbers gp on mips 8322 * [222]16357 [mipsisa64-elf] ICE copying 7 bytes between extern 8323 char[]s 8324 * [223]16380 [mips64] Use of uninitialised register after dbra 8325 conversion 8326 * [224]16407 [mips64] Unaligned access to local variables 8327 * [225]16643 [mips64] verify_local_live_at_start ICE after 8328 crossjumping & cfgcleanup 8329 8330 ARM-specific 8331 8332 * [226]15927 THUMB -O2: strength-reduced iteration variable ends up 8333 off by 1 8334 * [227]15948 THUMB: ICE with non-commutative cbranch 8335 * [228]17019 THUMB: bad switch statement in md code for 8336 addsi3_cbranch_scratch 8337 8338 IA64-specific 8339 8340 * [229]16130 ICE on valid code: in bundling, in config/ia64/ia64.c 8341 (-mtune=merced) 8342 * [230]16142 ICE on valid code: in bundling, in config/ia64/ia64.c 8343 (-mtune=itanium) 8344 * [231]16278 Gcc failed to build Linux kernel with -mtune=merced 8345 * [232]16414 ICE on valid code: typo in comparison of asm_noperands 8346 result 8347 * [233]16445 ICE on valid code: don't count ignored insns 8348 * [234]16490 ICE (segfault) while compiling with -fprofile-use 8349 * [235]16683 ia64 does not honor SUBTARGET_EXTRA_SPECS 8350 8351 PowerPC-specific 8352 8353 * [236]16195 (ppc64): Miscompilation of GCC 3.3.x by 3.4.x 8354 * [237]16239 ICE on ppc64 (mozilla 1.7 compile, -O1 -fno-exceptions 8355 issue) 8356 8357 SPARC-specific 8358 8359 * [238]16199 ICE while compiling apache 2.0.49 8360 * [239]16416 -m64 doesn't imply -mcpu=v9 anymore 8361 * [240]16430 ICE when returning non-C aggregates larger than 16 bytes 8362 8363 Bugs specific to embedded processors 8364 8365 * [241]16379 [m32r] can't output large model function call of memcpy 8366 * [242]17093 [m32r] ICE with -msdata=use -O0 8367 * [243]17119 [m32r] ICE at switch case 0x8000 8368 8369 DJGPP-specific 8370 8371 * [244]15928 libstdc++ in 3.4.x doesn't cross-compile for djgpp 8372 8373 Alpha Tru64-specific 8374 8375 * [245]16210 libstdc++ gratuitously omits "long long" I/O 8376 8377 Testsuite, documentation issues (compiler is not affected): 8378 8379 * [246]15488 (libstdc++) possibly insufficient file permissions for 8380 executing test suite 8381 * [247]16250 ada/doctools runs makeinfo even in release tarball 8382 __________________________________________________________________ 8383 8384 GCC 3.4.3 8385 8386 This is the [248]list of problem reports (PRs) from GCC's bug tracking 8387 system that are known to be fixed in the 3.4.3 release. This list might 8388 not be complete (that is, it is possible that some PRs that have been 8389 fixed are not listed here). 8390 8391 Bootstrap failures 8392 8393 * [249]17369 [ia64] Bootstrap failure with binutils-2.15.90.0.1.1 8394 * [250]17850 [arm-elf] bootstrap failure - libstdc++ uses strtold 8395 when undeclared 8396 8397 Internal compiler errors (ICEs) affecting multiple platforms 8398 8399 * [251]13948 (java) GCJ segmentation fault while compiling GL4Java 8400 .class files 8401 * [252]14492 ICE in loc_descriptor_from_tree, in dwarf2out.c 8402 * [253]16301 (c++) ICE when "strong" attribute is attached to a using 8403 directive 8404 * [254]16566 ICE with flexible arrays 8405 * [255]17023 ICE with nested functions in parameter declaration 8406 * [256]17027 ICE with noreturn function in loop at -O2 8407 * [257]17524 ICE in grokdeclarator, in cp/decl.c 8408 * [258]17826 (c++) ICE in cp_tree_equal 8409 8410 C and optimization bugs 8411 8412 * [259]15526 -ftrapv aborts on 0 * (-1) 8413 * [260]16999 #ident stopped working 8414 * [261]17503 quadratic behaviour in invalid_mode_change_p 8415 * [262]17581 Long long arithmetic fails inside a switch/case 8416 statement when compiled with -O2 8417 * [263]18129 -fwritable-strings doesn't work 8418 8419 C++ compiler and library bugs 8420 8421 * [264]10975 incorrect initial ostringstream::tellp() 8422 * [265]11722 Unbuffered filebuf::sgetn is slow 8423 * [266]14534 Unrecognizing static function as a template parameter 8424 when its return value is also templated 8425 * [267]15172 Copy constructor optimization in aggregate 8426 initialization 8427 * [268]15786 Bad error message for frequently occuring error. 8428 * [269]16162 Rejects valid member-template-definition 8429 * [270]16612 empty basic_strings can't live in shared memory 8430 * [271]16715 std::basic_iostream is instantiated when used, even 8431 though instantiations are already contained in libstdc++ 8432 * [272]16848 code in /ext/demangle.h appears broken 8433 * [273]17132 GCC fails to eliminate function template specialization 8434 when argument deduction fails 8435 * [274]17259 One more _S_leaf incorrectly qualified with _RopeRep:: 8436 in ropeimpl.h 8437 * [275]17327 use of `enumeral_type' in template type unification 8438 * [276]17393 "unused variable '._0'" warning with -Wall 8439 * [277]17501 Confusion with member templates 8440 * [278]17537 g++ not passing -lstdc++ to linker when all command line 8441 arguments are libraries 8442 * [279]17585 usage of unqualified name of static member from within 8443 class not allowed 8444 * [280]17821 Poor diagnostic for using "." instead of "->" 8445 * [281]17829 wrong error: call of overloaded function is ambiguous 8446 * [282]17851 Misleading diagnostic for invalid function declarations 8447 with undeclared types 8448 * [283]17976 Destructor is called twice 8449 * [284]18020 rejects valid definition of enum value in template 8450 * [285]18093 bogus conflict in namespace aliasing 8451 * [286]18140 C++ parser bug when using >> in templates 8452 8453 Fortran 8454 8455 * [287]17541 data statements with double precision constants fail 8456 8457 x86-specific 8458 8459 * [288]17853 -O2 ICE for MMX testcase 8460 8461 SPARC-specific 8462 8463 * [289]17245 ICE compiling gsl-1.5 statistics/lag1.c 8464 8465 Darwin-specific 8466 8467 * [290]17167 FATAL:Symbol L_foo$stub already defined. 8468 8469 AIX-specific 8470 8471 * [291]17277 could not catch an exception when specified -maix64 8472 8473 Solaris-specific 8474 8475 * [292]17505 <cmath> calls acosf(), ceilf(), and other functions 8476 missing from system libraries 8477 8478 HP/UX specific: 8479 8480 * [293]17684 /usr/ccs/bin/ld: Can't create libgcc_s.sl 8481 8482 ARM-specific 8483 8484 * [294]17384 ICE with mode attribute on structures 8485 8486 MIPS-specific 8487 8488 * [295]17770 No NOP after LWL with -mips1 8489 8490 Other embedded target specific 8491 8492 * [296]11476 [arc-elf] gcc ICE on newlib's vfprintf.c 8493 * [297]14064 [avr-elf] -fdata-sections triggers ICE 8494 * [298]14678 [m68hc11-elf] gcc ICE 8495 * [299]15583 [powerpc-rtems] powerpc-rtems lacks __USE_INIT_FINI__ 8496 * [300]15790 [i686-coff] Alignment error building gcc with i686-coff 8497 target 8498 * [301]15886 [SH] Miscompilation with -O2 -fPIC 8499 * [302]16884 [avr-elf] [fweb related] bug while initializing 8500 variables 8501 8502 Bugs relating to debugger support 8503 8504 * [303]13841 missing debug info for _Complex function arguments 8505 * [304]15860 [big-endian targets] No DW_AT_location debug info is 8506 emitted for formal arguments to a function that uses "register" 8507 qualifiers 8508 8509 Testsuite issues (compiler not affected) 8510 8511 * [305]17465 Testsuite in libffi overrides LD_LIBRARY_PATH 8512 * [306]17469 Testsuite in libstdc++ overrides LD_LIBRARY_PATH 8513 * [307]18138 [mips-sgi-irix6.5] libgcc_s.so.1 not found by 64-bit 8514 testsuite 8515 8516 Documentation 8517 8518 * [308]15498 typo in gcc manual: non-existing locale example en_UK, 8519 should be en_GB 8520 * [309]15747 [mips-sgi-irix5.3] /bin/sh hangs during bootstrap: 8521 document broken shell 8522 * [310]16406 USE_LD_AS_NEEDED undocumented 8523 __________________________________________________________________ 8524 8525 GCC 3.4.4 8526 8527 This is the [311]list of problem reports (PRs) from GCC's bug tracking 8528 system that are known to be fixed in the 3.4.4 release. This list might 8529 not be complete (that is, it is possible that some PRs that have been 8530 fixed are not listed here). 8531 __________________________________________________________________ 8532 8533 GCC 3.4.5 8534 8535 This is the [312]list of problem reports (PRs) from GCC's bug tracking 8536 system that are known to be fixed in the 3.4.5 release. This list might 8537 not be complete (that is, it is possible that some PRs that have been 8538 fixed are not listed here). 8539 8540 Bootstrap issues 8541 8542 * [313]24688 sco_math fixincl breaks math.h 8543 8544 C compiler bugs 8545 8546 * [314]17188 struct Foo { } redefinition 8547 * [315]20187 wrong code for ((unsigned char)(unsigned long 8548 long)((a?a:1)&(a*b)))?0:1) 8549 * [316]21873 infinite warning loop on bad array initializer 8550 * [317]21899 enum definition accepts values to be overriden 8551 * [318]22061 ICE in find_function_data, in function.c 8552 * [319]22308 Failure to diagnose violation of constraint 6.516p2 8553 * [320]22458 ICE on missing brace 8554 * [321]22589 ICE casting to long long 8555 * [322]24101 Segfault with preprocessed source 8556 8557 C++ compiler and library bugs 8558 8559 * [323]10611 operations on vector mode not recognized in C++ 8560 * [324]13377 unexpected behavior of namespace usage directive 8561 * [325]16002 Strange error message with new parser 8562 * [326]17413 local classes as template argument 8563 * [327]17609 spurious error message after using keyword 8564 * [328]17618 ICE in cp_convert_to_pointer, in cp/cvt.c 8565 * [329]18124 ICE with invalid template template parameter 8566 * [330]18155 typedef in template declaration not rejected 8567 * [331]18177 ICE with const_cast for undeclared variable 8568 * [332]18368 C++ error message regression 8569 * [333]16378 ICE when returning a copy of a packed member 8570 * [334]18466 int ::i; accepted 8571 * [335]18512 ICE on invalid usage of template base class 8572 * [336]18454 ICE when returning undefined type 8573 * [337]18738 typename not allowed with non-dependent qualified name 8574 * [338]18803 rejects access to operator() in template 8575 * [339]19004 ICE in uses_template_parms, in cp/pt.c 8576 * [340]19208 Spurious error about variably modified type 8577 * [341]18253 bad error message / ICE for invalid template parameter 8578 * [342]19608 ICE after friend function definition in local class 8579 * [343]19884 ICE on explicit instantiation of a non-template 8580 constructor 8581 * [344]20153 ICE when C++ template function contains anonymous union 8582 * [345]20563 Infinite loop in diagnostic (and ice after error 8583 message) 8584 * [346]20789 ICE with incomplete type in template 8585 * [347]21336 Internal compiler error when using custom new operators 8586 * [348]21768 ICE in error message due to violation of coding 8587 conventions 8588 * [349]21853 constness of pointer to data member ignored 8589 * [350]21903 Default argument of template function causes a 8590 compile-time error 8591 * [351]21983 multiple diagnostics 8592 * [352]21987 New testsuite failure 8593 g++.dg/warn/conversion-function-1.C 8594 * [353]22153 ICE on invalid template specialization 8595 * [354]22172 Internal compiler error, seg fault. 8596 * [355]21286 filebuf::xsgetn vs pipes 8597 * [356]22233 ICE with wrong number of template parameters 8598 * [357]22508 ICE after invalid operator new 8599 * [358]22545 ICE with pointer to class member & user defined 8600 conversion operator 8601 * [359]23528 Wrong default allocator in ext/hash_map 8602 * [360]23550 char_traits requirements/1.cc test bad math 8603 * [361]23586 Bad diagnostic for invalid namespace-name 8604 * [362]23624 ICE in invert_truthvalue, in fold-const.c 8605 * [363]23639 Bad error message: not a member of '<declaration error>' 8606 * [364]23797 ICE on typename outside template 8607 * [365]23965 Bogus error message: no matching function for call to 8608 'foo(<type error>)' 8609 * [366]24052 &#`label_decl' not supported by dump_expr#<expression 8610 error> 8611 * [367]24580 virtual base class cause exception not to be caught 8612 8613 Problems in generated debug information 8614 8615 * [368]24267 Bad DWARF for altivec vectors 8616 8617 Optimizations issues 8618 8619 * [369]17810 ICE in verify_local_live_at_start 8620 * [370]17860 Wrong generated code for loop with varying bound 8621 * [371]21709 ICE on compile-time complex NaN 8622 * [372]21964 broken tail call at -O2 or more 8623 * [373]22167 Strange optimization bug when using -Os 8624 * [374]22619 Compilation failure for real_const_1.f and 8625 real_const_2.f90 8626 * [375]23241 Invalid code generated for comparison of uchar to 255 8627 * [376]23478 Miscompilation due to reloading of a var that is also 8628 used in EH pad 8629 * [377]24470 segmentation fault in cc1plus when compiling with -O 8630 * [378]24950 ICE in operand_subword_force 8631 8632 Precompiled headers problems 8633 8634 * [379]14400 Cannot compile qt-x11-free-3.3.0 8635 * [380]14940 PCH largefile test fails on various platforms 8636 8637 Preprocessor bugs 8638 8639 * [381]20239 ICE on empty preprocessed input 8640 * [382]15220 "gcc -E -MM -MG" reports missing system headers in 8641 source directory 8642 8643 Testsuite issues 8644 8645 * [383]19275 gcc.dg/20020919-1.c fails with -fpic/-fPIC on 8646 i686-pc-linux-gnu 8647 8648 Alpha specific 8649 8650 * [384]21888 bootstrap failure with linker relaxation enabled 8651 8652 ARM specific 8653 8654 * [385]15342 [arm-linux]: ICE in verify_local_live_at_start 8655 * [386]23985 Memory aliasing information incorrect in inlined memcpy 8656 8657 ColdFile specific 8658 8659 * [387]16719 Illegal move of byte into address register causes 8660 compiler to ICE 8661 8662 HPPA specific 8663 8664 * [388]21723 ICE while building libgfortran 8665 * [389]21841 -mhp-ld/-mgnu-ld documentation 8666 8667 IA-64 specific 8668 8669 * [390]23644 IA-64 hardware models and configuration options 8670 documentation error 8671 * [391]24718 Shared libgcc not used for linking by default 8672 8673 M68000 specific 8674 8675 * [392]18421 ICE in reload_cse_simplify_operands, in postreload.c 8676 8677 MIPS specific 8678 8679 * [393]20621 ICE in change_address_1, in emit-rtl.c 8680 8681 PowerPC and PowerPC64 specific 8682 8683 * [394]18583 error on valid code: const 8684 __attribute__((altivec(vector__))) doesn't work in arrays 8685 * [395]20191 ICE in reload_cse_simplify_operands 8686 * [396]22083 AIX: TARGET_C99_FUNCTIONS is wrongly defined 8687 * [397]23070 CALL_V4_CLEAR_FP_ARGS flag not properly set 8688 * [398]23404 gij trashes args of functions with more than 8 fp args 8689 * [399]23539 C & C++ compiler generating misaligned references 8690 regardless of compiler flags 8691 * [400]24102 floatdisf2_internal2 broken 8692 * [401]24465 -mminimal-toc miscompilation of __thread vars 8693 8694 Solaris specific 8695 8696 * [402]19933 Problem with define of HUGE_VAL in math_c99 8697 * [403]21889 Native Solaris assembler cannot grok DTP-relative debug 8698 symbols 8699 8700 SPARC specific 8701 8702 * [404]19300 PCH failures on sparc-linux 8703 * [405]20301 Assembler labels have a leading "-" 8704 * [406]20673 C PCH testsuite assembly comparison failure 8705 8706 x86 and x86_64 specific 8707 8708 * [407]18582 ICE with arrays of type V2DF 8709 * [408]19340 Compilation SEGFAULTs with -O1 -fschedule-insns2 8710 -fsched2-use-traces 8711 * [409]21716 ICE in reg-stack.c's swap_rtx_condition 8712 * [410]24315 amd64 fails -fpeephole2 8713 __________________________________________________________________ 8714 8715 GCC 3.4.6 8716 8717 This is the [411]list of problem reports (PRs) from GCC's bug tracking 8718 system that are known to be fixed in the 3.4.6 release. This list might 8719 not be complete (that is, it is possible that some PRs that have been 8720 fixed are not listed here). 8721 8722 8723 For questions related to the use of GCC, please consult these web 8724 pages and the [412]GCC manuals. If that fails, the 8725 [413]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 8726 web pages and the development of GCC are welcome on our developer 8727 list at [414]gcc (a] gcc.gnu.org. All of [415]our lists have public 8728 archives. 8729 8730 Copyright (C) [416]Free Software Foundation, Inc. Verbatim copying and 8731 distribution of this entire article is permitted in any medium, 8732 provided this notice is preserved. 8733 8734 These pages are [417]maintained by the GCC team. 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http://gcc.gnu.org/PR19933 9141 403. http://gcc.gnu.org/PR21889 9142 404. http://gcc.gnu.org/PR19300 9143 405. http://gcc.gnu.org/PR20301 9144 406. http://gcc.gnu.org/PR20673 9145 407. http://gcc.gnu.org/PR18582 9146 408. http://gcc.gnu.org/PR19340 9147 409. http://gcc.gnu.org/PR21716 9148 410. http://gcc.gnu.org/PR24315 9149 411. http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=3.4.6 9150 412. http://gcc.gnu.org/onlinedocs/ 9151 413. mailto:gcc-help (a] gcc.gnu.org 9152 414. mailto:gcc (a] gcc.gnu.org 9153 415. http://gcc.gnu.org/lists.html 9154 416. http://www.fsf.org/ 9155 417. http://gcc.gnu.org/about.html 9156 418. http://validator.w3.org/check/referer 9157 ====================================================================== 9158 http://gcc.gnu.org/gcc-3.3/index.html 9159 9160 GCC 3.3 Release Series 9161 9162 May 03, 2005 9163 9164 The [1]GNU project and the GCC developers are pleased to announce the 9165 release of GCC 3.3.6. 9166 9167 This release is a bug-fix release, containing fixes for regressions in 9168 GCC 3.3.5 relative to previous releases of GCC. 9169 9170 This release is the last of the series 3.3.x. 9171 9172 The GCC 3.3 release series includes numerous [2]new features, 9173 improvements, bug fixes, and other changes, thanks to an [3]amazing 9174 group of volunteers. 9175 9176 Release History 9177 9178 GCC 3.3.6 9179 May 3, 2005 ([4]changes) 9180 9181 GCC 3.3.5 9182 September 30, 2004 ([5]changes) 9183 9184 GCC 3.3.4 9185 May 31, 2004 ([6]changes) 9186 9187 GCC 3.3.3 9188 February 14, 2004 ([7]changes) 9189 9190 GCC 3.3.2 9191 October 16, 2003 ([8]changes) 9192 9193 GCC 3.3.1 9194 August 8, 2003 ([9]changes) 9195 9196 GCC 3.3 9197 May 14, 2003 ([10]changes) 9198 9199 References and Acknowledgements 9200 9201 GCC used to stand for the GNU C Compiler, but since the compiler 9202 supports several other languages aside from C, it now stands for the 9203 GNU Compiler Collection. 9204 9205 A list of [11]successful builds is updated as new information becomes 9206 available. 9207 9208 The GCC developers would like to thank the numerous people that have 9209 contributed new features, improvements, bug fixes, and other changes as 9210 well as test results to GCC. This [12]amazing group of volunteers is 9211 what makes GCC successful. 9212 9213 For additional information about GCC please refer to the [13]GCC 9214 project web site or contact the [14]GCC development mailing list. 9215 9216 To obtain GCC please use [15]our mirror sites, or our CVS server. 9217 9218 9219 For questions related to the use of GCC, please consult these web 9220 pages and the [16]GCC manuals. If that fails, the 9221 [17]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 9222 web pages and the development of GCC are welcome on our developer 9223 list at [18]gcc (a] gcc.gnu.org. All of [19]our lists have public 9224 archives. 9225 9226 Copyright (C) [20]Free Software Foundation, Inc. Verbatim copying and 9227 distribution of this entire article is permitted in any medium, 9228 provided this notice is preserved. 9229 9230 These pages are [21]maintained by the GCC team. Last modified 9231 2012-11-02[22]. 9232 9233 References 9234 9235 1. http://www.gnu.org/ 9236 2. http://gcc.gnu.org/gcc-3.3/changes.html 9237 3. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 9238 4. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.6 9239 5. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.5 9240 6. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.4 9241 7. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.3 9242 8. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.2 9243 9. http://gcc.gnu.org/gcc-3.3/changes.html#3.3.1 9244 10. http://gcc.gnu.org/gcc-3.3/changes.html 9245 11. http://gcc.gnu.org/gcc-3.3/buildstat.html 9246 12. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 9247 13. http://gcc.gnu.org/index.html 9248 14. mailto:gcc (a] gcc.gnu.org 9249 15. http://gcc.gnu.org/mirrors.html 9250 16. http://gcc.gnu.org/onlinedocs/ 9251 17. mailto:gcc-help (a] gcc.gnu.org 9252 18. mailto:gcc (a] gcc.gnu.org 9253 19. http://gcc.gnu.org/lists.html 9254 20. http://www.fsf.org/ 9255 21. http://gcc.gnu.org/about.html 9256 22. http://validator.w3.org/check/referer 9257 ====================================================================== 9258 http://gcc.gnu.org/gcc-3.3/changes.html 9259 9260 GCC 3.3 Release Series 9261 Changes, New Features, and Fixes 9262 9263 The latest release in the 3.3 release series is [1]GCC 3.3.6. 9264 9265 Caveats 9266 9267 * The preprocessor no longer accepts multi-line string literals. They 9268 were deprecated in 3.0, 3.1, and 3.2. 9269 * The preprocessor no longer supports the -A- switch when appearing 9270 alone. -A- followed by an assertion is still supported. 9271 * Support for all the systems [2]obsoleted in GCC 3.1 has been 9272 removed from GCC 3.3. See below for a [3]list of systems which are 9273 obsoleted in this release. 9274 * Checking for null format arguments has been decoupled from the rest 9275 of the format checking mechanism. Programs which use the format 9276 attribute may regain this functionality by using the new [4]nonnull 9277 function attribute. Note that all functions for which GCC has a 9278 built-in format attribute, an appropriate built-in nonnull 9279 attribute is also applied. 9280 * The DWARF (version 1) debugging format has been deprecated and will 9281 be removed in a future version of GCC. Version 2 of the DWARF 9282 debugging format will continue to be supported for the foreseeable 9283 future. 9284 * The C and Objective-C compilers no longer accept the "Naming Types" 9285 extension (typedef foo = bar); it was already unavailable in C++. 9286 Code which uses it will need to be changed to use the "typeof" 9287 extension instead: typedef typeof(bar) foo. (We have removed this 9288 extension without a period of deprecation because it has caused the 9289 compiler to crash since version 3.0 and no one noticed until very 9290 recently. Thus we conclude it is not in widespread use.) 9291 * The -traditional C compiler option has been removed. It was 9292 deprecated in 3.1 and 3.2. (Traditional preprocessing remains 9293 available.) The <varargs.h> header, used for writing variadic 9294 functions in traditional C, still exists but will produce an error 9295 message if used. 9296 * GCC 3.3.1 automatically places zero-initialized variables in the 9297 .bss section on some operating systems. Versions of GNU Emacs up to 9298 (and including) 21.3 will not work correctly when using this 9299 optimization; you can use -fno-zero-initialized-in-bss to disable 9300 it. 9301 9302 General Optimizer Improvements 9303 9304 * A new scheme for accurately describing processor pipelines, the 9305 [5]DFA scheduler, has been added. 9306 * Pavel Nejedly, Charles University Prague, has contributed new file 9307 format used by the edge coverage profiler (-fprofile-arcs). 9308 The new format is robust and diagnoses common mistakes where 9309 profiles from different versions (or compilations) of the program 9310 are combined resulting in nonsensical profiles and slow code to 9311 produced with profile feedback. Additionally this format allows 9312 extra data to be gathered. Currently, overall statistics are 9313 produced helping optimizers to identify hot spots of a program 9314 globally replacing the old intra-procedural scheme and resulting in 9315 better code. Note that the gcov tool from older GCC versions will 9316 not be able to parse the profiles generated by GCC 3.3 and vice 9317 versa. 9318 * Jan Hubicka, SuSE Labs, has contributed a new superblock formation 9319 pass enabled using -ftracer. This pass simplifies the control flow 9320 of functions allowing other optimizations to do better job. 9321 He also contributed the function reordering pass 9322 (-freorder-functions) to optimize function placement using profile 9323 feedback. 9324 9325 New Languages and Language specific improvements 9326 9327 C/ObjC/C++ 9328 9329 * The preprocessor now accepts directives within macro arguments. It 9330 processes them just as if they had not been within macro arguments. 9331 * The separate ISO and traditional preprocessors have been completely 9332 removed. The front end handles either type of preprocessed output 9333 if necessary. 9334 * In C99 mode preprocessor arithmetic is done in the precision of the 9335 target's intmax_t, as required by that standard. 9336 * The preprocessor can now copy comments inside macros to the output 9337 file when the macro is expanded. This feature, enabled using the 9338 -CC option, is intended for use by applications which place 9339 metadata or directives inside comments, such as lint. 9340 * The method of constructing the list of directories to be searched 9341 for header files has been revised. If a directory named by a -I 9342 option is a standard system include directory, the option is 9343 ignored to ensure that the default search order for system 9344 directories and the special treatment of system header files are 9345 not defeated. 9346 * A few more [6]ISO C99 features now work correctly. 9347 * A new function attribute, nonnull, has been added which allows 9348 pointer arguments to functions to be specified as requiring a 9349 non-null value. The compiler currently uses this information to 9350 issue a warning when it detects a null value passed in such an 9351 argument slot. 9352 * A new type attribute, may_alias, has been added. Accesses to 9353 objects with types with this attribute are not subjected to 9354 type-based alias analysis, but are instead assumed to be able to 9355 alias any other type of objects, just like the char type. 9356 9357 C++ 9358 9359 * Type based alias analysis has been implemented for C++ aggregate 9360 types. 9361 9362 Objective-C 9363 9364 * Generate an error if Objective-C objects are passed by value in 9365 function and method calls. 9366 * When -Wselector is used, check the whole list of selectors at the 9367 end of compilation, and emit a warning if a @selector() is not 9368 known. 9369 * Define __NEXT_RUNTIME__ when compiling for the NeXT runtime. 9370 * No longer need to include objc/objc-class.h to compile self calls 9371 in class methods (NeXT runtime only). 9372 * New -Wundeclared-selector option. 9373 * Removed selector bloating which was causing object files to be 10% 9374 bigger on average (GNU runtime only). 9375 * Using at run time @protocol() objects has been fixed in certain 9376 situations (GNU runtime only). 9377 * Type checking has been fixed and improved in many situations 9378 involving protocols. 9379 9380 Java 9381 9382 * The java.sql and javax.sql packages now implement the JDBC 3.0 (JDK 9383 1.4) API. 9384 * The JDK 1.4 assert facility has been implemented. 9385 * The bytecode interpreter is now direct threaded and thus faster. 9386 9387 Fortran 9388 9389 * Fortran improvements are listed in [7]the Fortran documentation. 9390 9391 Ada 9392 9393 * Ada tasking now works with glibc 2.3.x threading libraries. 9394 9395 New Targets and Target Specific Improvements 9396 9397 * The following changes have been made to the HP-PA port: 9398 + The port now defaults to scheduling for the PA8000 series of 9399 processors. 9400 + Scheduling support for the PA7300 processor has been added. 9401 + The 32-bit port now supports weak symbols under HP-UX 11. 9402 + The handling of initializers and finalizers has been improved 9403 under HP-UX 11. The 64-bit port no longer uses collect2. 9404 + Dwarf2 EH support has been added to the 32-bit GNU/Linux port. 9405 + ABI fixes to correct the passing of small structures by value. 9406 * The SPARC, HP-PA, SH4, and x86/pentium ports have been converted to 9407 use the DFA processor pipeline description. 9408 * The following NetBSD configurations for the SuperH processor family 9409 have been added: 9410 + SH3, big-endian, sh-*-netbsdelf* 9411 + SH3, little-endian, shle-*-netbsdelf* 9412 + SH5, SHmedia, big-endian, 32-bit default, sh5-*-netbsd* 9413 + SH5, SHmedia, little-endian, 32-bit default, sh5le-*-netbsd* 9414 + SH5, SHmedia, big-endian, 64-bit default, sh64-*-netbsd* 9415 + SH5, SHmedia, little-endian, 64-bit default, sh64le-*-netbsd* 9416 * The following changes have been made to the IA-32/x86-64 port: 9417 + SSE2 and 3dNOW! intrinsics are now supported. 9418 + Support for thread local storage has been added to the IA-32 9419 and x86-64 ports. 9420 + The x86-64 port has been significantly improved. 9421 * The following changes have been made to the MIPS port: 9422 + All configurations now accept the -mabi switch. Note that you 9423 will need appropriate multilibs for this option to work 9424 properly. 9425 + ELF configurations will always pass an ABI flag to the 9426 assembler, except when the MIPS EABI is selected. 9427 + -mabi=64 no longer selects MIPS IV code. 9428 + The -mcpu option, which was deprecated in 3.1 and 3.2, has 9429 been removed from this release. 9430 + -march now changes the core ISA level. In previous releases, 9431 it would change the use of processor-specific extensions, but 9432 would leave the core ISA unchanged. For example, mips64-elf 9433 -march=r8000 will now generate MIPS IV code. 9434 + Under most configurations, -mipsN now acts as a synonym for 9435 -march. 9436 + There are some new preprocessor macros to describe the -march 9437 and -mtune settings. See the documentation of those options 9438 for details. 9439 + Support for the NEC VR-Series processors has been added. This 9440 includes the 54xx, 5500, and 41xx series. 9441 + Support for the Sandcraft sr71k processor has been added. 9442 * The following changes have been made to the S/390 port: 9443 + Support to build the Java runtime libraries has been added. 9444 Java is now enabled by default on s390-*-linux* and 9445 s390x-*-linux* targets. 9446 + Multilib support for the s390x-*-linux* target has been added; 9447 this allows to build 31-bit binaries using the -m31 option. 9448 + Support for thread local storage has been added. 9449 + Inline assembler code may now use the 'Q' constraint to 9450 specify memory operands without index register. 9451 + Various platform-specific performance improvements have been 9452 implemented; in particular, the compiler now uses the BRANCH 9453 ON COUNT family of instructions and makes more frequent use of 9454 the TEST UNDER MASK family of instructions. 9455 * The following changes have been made to the PowerPC port: 9456 + Support for IBM Power4 processor added. 9457 + Support for Motorola e500 SPE added. 9458 + Support for AIX 5.2 added. 9459 + Function and Data sections now supported on AIX. 9460 + Sibcall optimizations added. 9461 * The support for H8 Tiny is added to the H8/300 port with -mn. 9462 9463 Obsolete Systems 9464 9465 Support for a number of older systems has been declared obsolete in GCC 9466 3.3. Unless there is activity to revive them, the next release of GCC 9467 will have their sources permanently removed. 9468 9469 All configurations of the following processor architectures have been 9470 declared obsolete: 9471 * Matsushita MN10200, mn10200-*-* 9472 * Motorola 88000, m88k-*-* 9473 * IBM ROMP, romp-*-* 9474 9475 Also, some individual systems have been obsoleted: 9476 * Alpha 9477 + Interix, alpha*-*-interix* 9478 + Linux libc1, alpha*-*-linux*libc1* 9479 + Linux ECOFF, alpha*-*-linux*ecoff* 9480 * ARM 9481 + Generic a.out, arm*-*-aout* 9482 + Conix, arm*-*-conix* 9483 + "Old ABI," arm*-*-oabi 9484 + StrongARM/COFF, strongarm-*-coff* 9485 * HPPA (PA-RISC) 9486 + Generic OSF, hppa1.0-*-osf* 9487 + Generic BSD, hppa1.0-*-bsd* 9488 + HP/UX versions 7, 8, and 9, hppa1.[01]-*-hpux[789]* 9489 + HiUX, hppa*-*-hiux* 9490 + Mach Lites, hppa*-*-lites* 9491 * Intel 386 family 9492 + Windows NT 3.x, i?86-*-win32 9493 * MC68000 family 9494 + HP systems, m68000-hp-bsd* and m68k-hp-bsd* 9495 + Sun systems, m68000-sun-sunos*, m68k-sun-sunos*, and 9496 m68k-sun-mach* 9497 + AT&T systems, m68000-att-sysv* 9498 + Atari systems, m68k-atari-sysv* 9499 + Motorola systems, m68k-motorola-sysv* 9500 + NCR systems, m68k-ncr-sysv* 9501 + Plexus systems, m68k-plexus-sysv* 9502 + Commodore systems, m68k-cbm-sysv* 9503 + Citicorp TTI, m68k-tti-* 9504 + Unos, m68k-crds-unos* 9505 + Concurrent RTU, m68k-ccur-rtu* 9506 + Linux a.out, m68k-*-linux*aout* 9507 + Linux libc1, m68k-*-linux*libc1* 9508 + pSOS, m68k-*-psos* 9509 * MIPS 9510 + Generic ECOFF, mips*-*-ecoff* 9511 + SINIX, mips-sni-sysv4 9512 + Orion RTEMS, mips64orion-*-rtems* 9513 * National Semiconductor 32000 9514 + OpenBSD, ns32k-*-openbsd* 9515 * POWER (aka RS/6000) and PowerPC 9516 + AIX versions 1, 2, and 3, rs6000-ibm-aix[123]* 9517 + Bull BOSX, rs6000-bull-bosx 9518 + Generic Mach, rs6000-*-mach* 9519 + Generic SysV, powerpc*-*-sysv* 9520 + Linux libc1, powerpc*-*-linux*libc1* 9521 * Sun SPARC 9522 + Generic a.out, sparc-*-aout*, sparclet-*-aout*, 9523 sparclite-*-aout*, and sparc86x-*-aout* 9524 + NetBSD a.out, sparc-*-netbsd*aout* 9525 + Generic BSD, sparc-*-bsd* 9526 + ChorusOS, sparc-*-chorusos* 9527 + Linux a.out, sparc-*-linux*aout* 9528 + Linux libc1, sparc-*-linux*libc1* 9529 + LynxOS, sparc-*-lynxos* 9530 + Solaris on HAL hardware, sparc-hal-solaris2* 9531 + SunOS versions 3 and 4, sparc-*-sunos[34]* 9532 * NEC V850 9533 + RTEMS, v850-*-rtems* 9534 * VAX 9535 + VMS, vax-*-vms* 9536 9537 Documentation improvements 9538 9539 Other significant improvements 9540 9541 * Almost all front-end dependencies in the compiler have been 9542 separated out into a set of language hooks. This should make adding 9543 a new front end clearer and easier. 9544 * One effect of removing the separate preprocessor is a small 9545 increase in the robustness of the compiler in general, and the 9546 maintainability of target descriptions. Previously target-specific 9547 built-in macros and others, such as __FAST_MATH__, had to be 9548 handled with so-called specs that were hard to maintain. Often they 9549 would fail to behave properly when conflicting options were 9550 supplied on the command line, and define macros in the user's 9551 namespace even when strict ISO compliance was requested. 9552 Integrating the preprocessor has cleanly solved these issues. 9553 * The Makefile suite now supports redirection of make install by 9554 means of the variable DESTDIR. 9555 __________________________________________________________________ 9556 9557 GCC 3.3 9558 9559 Detailed release notes for the GCC 3.3 release follow. 9560 9561 Bug Fixes 9562 9563 bootstrap failures 9564 9565 * [8]10140 cross compiler build failures: missing __mempcpy (DUP: 9566 [9]10198,[10]10338) 9567 9568 Internal compiler errors (multi-platform) 9569 9570 * [11]3581 large string causes segmentation fault in cc1 9571 * [12]4382 __builtin_{set,long}jmp with -O3 can crash the compiler 9572 * [13]5533 (c++) ICE when processing std::accumulate(begin, end, 9573 init, invalid_op) 9574 * [14]6387 -fpic -gdwarf-2 -g1 combination gives ICE in dwarf2out 9575 * [15]6412 (c++) ICE in retrieve_specialization 9576 * [16]6620 (c++) partial template specialization causes an ICE 9577 (segmentation fault) 9578 * [17]6663 (c++) ICE with attribute aligned 9579 * [18]7068 ICE with incomplete types 9580 * [19]7083 (c++) ICE using -gstabs with dodgy class derivation 9581 * [20]7647 (c++) ICE when data member has the name of the enclosing 9582 class 9583 * [21]7675 ICE in fixup_var_refs_1 9584 * [22]7718 'complex' template instantiation causes ICE 9585 * [23]8116 (c++) ICE in member template function 9586 * [24]8358 (ada) Ada compiler accesses freed memory, crashes 9587 * [25]8511 (c++) ICE: (hopefully) reproducible cc1plus segmentation 9588 fault 9589 * [26]8564 (c++) ICE in find_function_data, in function.c 9590 * [27]8660 (c++) template overloading ICE in tsubst_expr, in cp/pt.c 9591 * [28]8766 (c++) ICE after failed initialization of static template 9592 variable 9593 * [29]8803 ICE in instantiate_virtual_regs_1, in function.c 9594 * [30]8846 (c++) ICE after diagnostic if fr_FR@euro locale is set 9595 * [31]8906 (c++) ICE (Segmentation fault) when parsing nested-class 9596 definition 9597 * [32]9216 (c++) ICE on missing template parameter 9598 * [33]9261 (c++) ICE in arg_assoc, in cp/decl2.c 9599 * [34]9263 (fortran) ICE caused by invalid PARAMETER in implied DO 9600 loop 9601 * [35]9429 (c++) ICE in template instantiation with a pointered new 9602 operator 9603 * [36]9516 Internal error when using a big array 9604 * [37]9600 (c++) ICE with typedefs in template class 9605 * [38]9629 (c++) virtual inheritance segfault 9606 * [39]9672 (c++) ICE: Error reporting routines re-entered 9607 * [40]9749 (c++) ICE in write_expression on invalid function 9608 prototype 9609 * [41]9794 (fortran) ICE: floating point exception during constant 9610 folding 9611 * [42]9829 (c++) Missing colon in nested namespace usage causes ICE 9612 * [43]9916 (c++) ICE with noreturn function in ?: statement 9613 * [44]9936 ICE with local function and variable-length 2d array 9614 * [45]10262 (c++) cc1plus crashes with large generated code 9615 * [46]10278 (c++) ICE in parser for invalid code 9616 * [47]10446 (c++) ICE on definition of nonexistent member function of 9617 nested class in a class template 9618 * [48]10451 (c++) ICE in grokdeclarator on spurious mutable 9619 declaration 9620 * [49]10506 (c++) ICE in build_new at cp/init.c with 9621 -fkeep-inline-functions and multiple inheritance 9622 * [50]10549 (c++) ICE in store_bit_field on bitfields that exceed the 9623 precision of the declared type 9624 9625 Optimization bugs 9626 9627 * [51]2001 Inordinately long compile times in reload CSE regs 9628 * [52]2391 Exponential compilation time explosion in combine 9629 * [53]2960 Duplicate loop conditions even with -Os 9630 * [54]4046 redundant conditional branch 9631 * [55]6405 Loop-unrolling related performance regressions 9632 * [56]6798 very long compile time with large case-statement 9633 * [57]6871 const objects shouldn't be moved to .bss 9634 * [58]6909 problem w/ -Os on modified loop-2c.c test case 9635 * [59]7189 gcc -O2 -Wall does not print ``control reaches end of 9636 non-void function'' warning 9637 * [60]7642 optimization problem with signbit() 9638 * [61]8634 incorrect code for inlining of memcpy under -O2 9639 * [62]8750 Cygwin prolog generation erroneously emitting __alloca as 9640 regular function call 9641 9642 C front end 9643 9644 * [63]2161 long if-else cascade overflows parser stack 9645 * [64]4319 short accepted on typedef'd char 9646 * [65]8602 incorrect line numbers in warning messages when using 9647 inline functions 9648 * [66]9177 -fdump-translation-unit: C front end deletes function_decl 9649 AST nodes and breaks debugging dumps 9650 * [67]9853 miscompilation of non-constant structure initializer 9651 9652 c++ compiler and library 9653 9654 * [68]45 legal template specialization code is rejected (DUP: 9655 [69]3784) 9656 * [70]764 lookup failure: friend operator and dereferencing a pointer 9657 and templates (DUP: [71]5116) 9658 * [72]2862 gcc accepts invalid explicit instantiation syntax (DUP: 9659 2863) 9660 * [73]3663 G++ doesn't check access control during template 9661 instantiation 9662 * [74]3797 gcc fails to emit explicit specialization of a template 9663 member 9664 * [75]3948 Two destructors are called when no copy destructor is 9665 defined (ABI change) 9666 * [76]4137 Conversion operator within template is not accepted 9667 * [77]4361 bogus ambiguity taking the address of a member template 9668 * [78]4802 g++ accepts illegal template code (access to private 9669 member; DUP: [79]5837) 9670 * [80]4803 inline function is used but never defined, and g++ does 9671 not object 9672 * [81]5094 Partial specialization cannot be friend? 9673 * [82]5730 complex<double>::norm() -- huge slowdown from egcs-2.91.66 9674 * [83]6713 Regression wrt 3.0.4: g++ -O2 leads to seg fault at run 9675 time 9676 * [84]7015 certain __asm__ constructs rejected 9677 * [85]7086 compile time regression (quadratic behavior in 9678 fixup_var_refs) 9679 * [86]7099 G++ doesn't set the noreturn attribute on std::exit and 9680 std::abort 9681 * [87]7247 copy constructor missing when inlining enabled (invalid 9682 optimization?) 9683 * [88]7441 string array initialization compilation time regression 9684 from seconds to minutes 9685 * [89]7768 __PRETTY_FUNCTION__ for template destructor is wrong 9686 * [90]7804 bad printing of floating point constant in warning message 9687 * [91]8099 Friend classes and template specializations 9688 * [92]8117 member function pointers and multiple inheritance 9689 * [93]8205 using declaration and multiple inheritance 9690 * [94]8645 unnecessary non-zero checks in stl_tree.h 9691 * [95]8724 explicit destructor call for incomplete class allowed 9692 * [96]8805 compile time regression with many member variables 9693 * [97]8691 -O3 and -fno-implicit-templates are incompatible 9694 * [98]8700 unhelpful error message for binding temp to reference 9695 * [99]8724 explicit destructor call for incomplete class allowed 9696 * [100]8949 numeric_limits<>::denorm_min() and is_iec559 problems 9697 * [101]9016 Failure to consistently constant fold "constant" C++ 9698 objects 9699 * [102]9053 g++ confused about ambiguity of overloaded function 9700 templates 9701 * [103]9152 undefined virtual thunks 9702 * [104]9182 basic_filebuf<> does not report errors in codecvt<>::out 9703 * [105]9297 data corruption due to codegen bug (when copying.) 9704 * [106]9318 i/ostream::operator>>/<<(streambuf*) broken 9705 * [107]9320 Incorrect usage of traits_type::int_type in stdio_filebuf 9706 * [108]9400 bogus -Wshadow warning: shadowed declaration of this in 9707 local classes 9708 * [109]9424 i/ostream::operator>>/<<(streambuf*) drops characters 9709 * [110]9425 filebuf::pbackfail broken (DUP: [111]9439) 9710 * [112]9474 GCC freezes in compiling a weird code mixing <iostream> 9711 and <iostream.h> 9712 * [113]9548 Incorrect results from setf(ios::fixed) and precision(-1) 9713 [114][DR 231] 9714 * [115]9555 ostream inserters fail to set badbit on exception 9715 * [116]9561 ostream inserters rethrow exception of wrong type 9716 * [117]9563 ostream::sentry returns true after a failed preparation 9717 * [118]9582 one-definition rule violation in std::allocator 9718 * [119]9622 __PRETTY_FUNCTION__ incorrect in template destructors 9719 * [120]9683 bug in initialization chains for static const variables 9720 from template classes 9721 * [121]9791 -Woverloaded-virtual reports hiding of destructor 9722 * [122]9817 collate::compare doesn't handle nul characters 9723 * [123]9825 filebuf::sputbackc breaks sbumpc 9724 * [124]9826 operator>>(basic_istream, basic_string) fails to compile 9725 with custom traits 9726 * [125]9924 Multiple using statements for builtin functions not 9727 allowed 9728 * [126]9946 destructor is not called for temporary object 9729 * [127]9964 filebuf::close() sometimes fails to close file 9730 * [128]9988 filebuf::overflow writes EOF to file 9731 * [129]10033 optimization breaks polymorphic references w/ typeid 9732 operator 9733 * [130]10097 filebuf::underflow drops characters 9734 * [131]10132 filebuf destructor can throw exceptions 9735 * [132]10180 gcc fails to warn about non-inlined function 9736 * [133]10199 method parametrized by template does not work everywhere 9737 * [134]10300 use of array-new (nothrow) in segfaults on NULL return 9738 * [135]10427 Stack corruption with variable-length automatic arrays 9739 and virtual destructors 9740 * [136]10503 Compilation never stops in fixed_type_or_null 9741 9742 Objective-C 9743 9744 * [137]5956 selectors aren't matched properly when added to the 9745 selector table 9746 9747 Fortran compiler and library 9748 9749 * [138]1832 list directed i/o overflow hangs, -fbounds-check doesn't 9750 detect 9751 * [139]3924 g77 generates code that is rejected by GAS if COFF debug 9752 info requested 9753 * [140]5634 doc: explain that configure --prefix=~/... does not work 9754 * [141]6367 multiple repeat counts confuse namelist read into array 9755 * [142]6491 Logical operations error on logicals when using 9756 -fugly-logint 9757 * [143]6742 Generation of C++ Prototype for FORTRAN and extern "C" 9758 * [144]7113 Failure of g77.f-torture/execute/f90-intrinsic-bit.f -Os 9759 on irix6.5 9760 * [145]7236 OPEN(...,RECL=nnn,...) without ACCESS='DIRECT' should 9761 assume a direct access file 9762 * [146]7278 g77 "bug"; the executable misbehaves (with -O2 9763 -fno-automatic) 9764 * [147]7384 DATE_AND_TIME milliseconds field inactive on Windows 9765 * [148]7388 Incorrect output with 0-based array of characters 9766 * [149]8587 Double complex zero ** double precision number -> NaN 9767 instead of zero 9768 * [150]9038 -ffixed-line-length-none -x f77-cpp-input gives: Warning: 9769 unknown register name line-length-none 9770 * [151]10197 Direct access files not unformatted by default 9771 9772 Java compiler and library 9773 9774 * [152]6005 gcj fails to build rhug on alpha 9775 * [153]6389 System.getProperty("") should always throw an 9776 IllegalArgumentException 9777 * [154]6576 java.util.ResourceBundle.getResource ignores locale 9778 * [155]6652 new java.io.File("").getCanonicalFile() throws exception 9779 * [156]7060 getMethod() doesn't search super interface 9780 * [157]7073 bytecode interpreter gives wrong answer for interface 9781 getSuperclass() 9782 * [158]7180 possible bug in 9783 javax.naming.spi.NamingManager.getPlusPath() 9784 * [159]7416 java.security startup refs "GNU libgcj.security" 9785 * [160]7570 Runtime.exec with null envp: child doesn't inherit parent 9786 env (DUP: [161]7578) 9787 * [162]7611 Internal error while compiling libjava with -O 9788 * [163]7709 NullPointerException in _Jv_ResolvePoolEntry 9789 * [164]7766 ZipInputStream.available returns 0 immediately after 9790 construction 9791 * [165]7785 Calendar.getTimeInMillis/setTimeInMillis should be public 9792 * [166]7786 TimeZone.getDSTSavings() from JDK1.4 not implemented 9793 * [167]8142 '$' in class names vs. dlopen 'dynamic string tokens' 9794 * [168]8234 ZipInputStream chokes when InputStream.read() returns 9795 small chunks 9796 * [169]8415 reflection bug: exception info for Method 9797 * [170]8481 java.Random.nextInt(int) may return negative 9798 * [171]8593 Error reading GZIPped files with BufferedReader 9799 * [172]8759 java.beans.Introspector has no flushCaches() or 9800 flushFromCaches() methods 9801 * [173]8997 spin() calls Thread.sleep 9802 * [174]9253 on win32, java.io.File.listFiles("C:\\") returns pwd 9803 instead of the root content of C: 9804 * [175]9254 java::lang::Object::wait(), threads-win32.cc returns 9805 wrong return codes 9806 * [176]9271 Severe bias in java.security.SecureRandom 9807 9808 Ada compiler and library 9809 9810 * [177]6767 make gnatlib-shared fails on -laddr2line 9811 * [178]9911 gnatmake fails to link when GCC configured with 9812 --with-sjlj-exceptions=yes 9813 * [179]10020 Can't bootstrap gcc on AIX with Ada enabled 9814 * [180]10546 Ada tasking not working on Red Hat 9 9815 9816 preprocessor 9817 9818 * [181]7029 preprocessor should ignore #warning with -M 9819 9820 ARM-specific 9821 9822 * [182]2903 [arm] Optimization bug with long long arithmetic 9823 * [183]7873 arm-linux-gcc fails when assigning address to a bit field 9824 9825 FreeBSD-specific 9826 9827 * [184]7680 float functions undefined in math.h/cmath with #define 9828 _XOPEN_SOURCE 9829 9830 HP-UX or HP-PA-specific 9831 9832 * [185]8705 [HP-PA] ICE in emit_move_insn_1, in expr.c 9833 * [186]9986 [HP-UX] Incorrect transformation of fputs_unlocked to 9834 fputc_unlocked 9835 * [187]10056 [HP-PA] ICE at -O2 when building c++ code from doxygen 9836 9837 m68hc11-specific 9838 9839 * [188]6744 Bad assembler code generated: reference to pseudo 9840 register z 9841 * [189]7361 Internal compiler error in reload_cse_simplify_operands, 9842 in reload1.c 9843 9844 MIPS-specific 9845 9846 * [190]9496 [mips-linux] bug in optimizer? 9847 9848 PowerPC-specific 9849 9850 * [191]7067 -Os with -mcpu=powerpc optimizes for speed (?) instead of 9851 space 9852 * [192]8480 reload ICEs for LAPACK code on powerpc64-linux 9853 * [193]8784 [AIX] Internal compiler error in simplify_gen_subreg 9854 * [194]10315 [powerpc] ICE: in extract_insn, in recog.c 9855 9856 SPARC-specific 9857 9858 * [195]10267 (documentation) Wrong build instructions for 9859 *-*-solaris2* 9860 9861 x86-specific (Intel/AMD) 9862 9863 * [196]7916 ICE in instantiate_virtual_register_1 9864 * [197]7926 (c++) i486 instructions in header files make c++ programs 9865 crash on i386 9866 * [198]8555 ICE in gen_split_1231 9867 * [199]8994 ICE with -O -march=pentium4 9868 * [200]9426 ICE with -fssa -funroll-loops -fprofile-arcs 9869 * [201]9806 ICE in inline assembly with -fPIC flag 9870 * [202]10077 gcc -msse2 generates movd to move dwords between xmm 9871 regs 9872 * [203]10233 64-bit comparison only comparing bottom 32-bits 9873 * [204]10286 type-punning doesn't work with __m64 and -O 9874 * [205]10308 [x86] ICE with -O -fgcse or -O2 9875 __________________________________________________________________ 9876 9877 GCC 3.3.1 9878 9879 Bug Fixes 9880 9881 This section lists the problem reports (PRs) from GCC's bug tracking 9882 system that are known to be fixed in the 3.3.1 release. This list might 9883 not be complete (that is, it is possible that some PRs that have been 9884 fixed are not listed here). 9885 9886 Bootstrap failures 9887 9888 * [206]11272 [Solaris] make bootstrap fails while building libstdc++ 9889 9890 Internal compiler errors (multi-platform) 9891 9892 * [207]5754 ICE on invalid nested template class 9893 * [208]6597 ICE in set_mem_alias_set compiling Qt with -O2 on ia64 9894 and --enable-checking 9895 * [209]6949 (c++) ICE in tsubst_decl, in cp/pt.c 9896 * [210]7053 (c++) ICE when declaring a function already defined as a 9897 friend method of a template class 9898 * [211]8164 (c++) ICE when using different const expressions as 9899 template parameter 9900 * [212]8384 (c++) ICE in is_base_type, in dwarf2out.c 9901 * [213]9559 (c++) ICE with invalid initialization of a static const 9902 * [214]9649 (c++) ICE in finish_member_declaration, in cp/semantics.c 9903 when redeclaring a static member variable 9904 * [215]9864 (fortran) ICE in add_abstract_origin_attribute, in 9905 dwarfout.c with -g -O -finline-functions 9906 * [216]10432 (c++) ICE in poplevel, in cp/decl.c 9907 * [217]10475 ICE in subreg_highpart_offset for code with long long 9908 * [218]10635 (c++) ICE when dereferencing an incomplete type casted 9909 from a void pointer 9910 * [219]10661 (c++) ICE in instantiate_decl, in cp/pt.c while 9911 instantiating static member variables 9912 * [220]10700 ICE in copy_to_mode_reg on 64-bit targets 9913 * [221]10712 (c++) ICE in constructor_name_full, in cp/decl2.c 9914 * [222]10796 (c++) ICE when defining an enum with two values: -1 and 9915 MAX_INT_64BIT 9916 * [223]10890 ICE in merge_assigned_reloads building Linux 2.4.2x 9917 sched.c 9918 * [224]10939 (c++) ICE with template code 9919 * [225]10956 (c++) ICE when specializing a template member function 9920 of a template class, in tsubst, in cp/pt.c 9921 * [226]11041 (c++) ICE: const myclass &x = *x; (when operator*() 9922 defined) 9923 * [227]11059 (c++) ICE with empty union 9924 * [228]11083 (c++) ICE in commit_one_edge_insertion, in cfgrtl.c with 9925 -O2 -fnon-call-exceptions 9926 * [229]11105 (c++) ICE in mangle_conv_op_name_for_type 9927 * [230]11149 (c++) ICE on error when instantiation with call function 9928 of a base type 9929 * [231]11228 (c++) ICE on new-expression using array operator new and 9930 default-initialization 9931 * [232]11282 (c++) Infinite memory usage after syntax error 9932 * [233]11301 (fortran) ICE with -fno-globals 9933 * [234]11308 (c++) ICE when using an enum type name as if it were a 9934 class or namespace 9935 * [235]11473 (c++) ICE with -gstabs when empty struct inherits from 9936 an empty struct 9937 * [236]11503 (c++) ICE when instantiating template with ADDR_EXPR 9938 * [237]11513 (c++) ICE in push_template_decl_real, in cp/pt.c: 9939 template member functions 9940 9941 Optimization bugs 9942 9943 * [238]11198 -O2 -frename-registers generates wrong code (aliasing 9944 problem) 9945 * [239]11304 Wrong code production with -fomit-frame-pointer 9946 * [240]11381 volatile memory access optimized away 9947 * [241]11536 [strength-reduce] -O2 optimization produces wrong code 9948 * [242]11557 constant folding bug generates wrong code 9949 9950 C front end 9951 9952 * [243]5897 No warning for statement after return 9953 * [244]11279 DWARF-2 output mishandles large enums 9954 9955 Preprocessor bugs 9956 9957 * [245]11022 no warning for non-compatible macro redefinition 9958 9959 C++ compiler and library 9960 9961 * [246]2330 static_cast<>() to a private base is allowed 9962 * [247]5388 Incorrect message "operands to ?: have different types" 9963 * [248]5390 Libiberty fails to demangle multi-digit template 9964 parameters 9965 * [249]7877 Incorrect parameter passing to specializations of member 9966 function templates 9967 * [250]9393 Anonymous namespaces and compiling the same file twice 9968 * [251]10032 -pedantic converts some errors to warnings 9969 * [252]10468 const typeof(x) is non-const, but only in templates 9970 * [253]10527 confused error message with "new int()" parameter 9971 initializer 9972 * [254]10679 parameter MIN_INLINE_INSNS is not honored 9973 * [255]10682 gcc chokes on a typedef for an enum inside a class 9974 template 9975 * [256]10689 pow(std::complex(0),1/3) returns (nan, nan) instead of 9976 0. 9977 * [257]10845 template member function (with nested template as 9978 parameter) cannot be called anymore if another unrelated template 9979 member function is defined 9980 * [258]10849 Cannot define an out-of-class specialization of a 9981 private nested template class 9982 * [259]10888 Suppress -Winline warnings for system headers 9983 * [260]10929 -Winline warns about functions for which no definition 9984 is visible 9985 * [261]10931 valid conversion static_cast<const unsigned 9986 int&>(lvalue-of-type-int) is rejected 9987 * [262]10940 Bad code with explicit specialization 9988 * [263]10968 If member function implicitly instantiated, explicit 9989 instantiation of class fails to instantiate it 9990 * [264]10990 Cannot convert with dynamic_cast<> to a private base 9991 class from within a member function 9992 * [265]11039 Bad interaction between implicit typename deprecation 9993 and friendship 9994 * [266]11062 (libstdc++) avoid __attribute__ ((unused)); say 9995 "__unused__" instead 9996 * [267]11095 C++ iostream manipulator causes segfault when called 9997 with negative argument 9998 * [268]11098 g++ doesn't emit complete debugging information for 9999 local variables in destructors 10000 * [269]11137 GNU/Linux shared library constructors not called unless 10001 there's one global object 10002 * [270]11154 spurious ambiguity report for template class 10003 specialization 10004 * [271]11329 Compiler cannot find user defined implicit typecast 10005 * [272]11332 Spurious error with casts in ?: expression 10006 * [273]11431 static_cast behavior with subclasses when default 10007 constructor available 10008 * [274]11528 money_get facet does not accept "$.00" as valid 10009 * [275]11546 Type lookup problems in out-of-line definition of a 10010 class doubly nested from a template class 10011 * [276]11567 C++ code containing templated member function with same 10012 name as pure virtual member function results in linking failure 10013 * [277]11645 Failure to deal with using and private inheritance 10014 10015 Java compiler and library 10016 10017 * [278]5179 Qualified static field access doesn't initialize its 10018 class 10019 * [279]8204 gcj -O2 to native reorders certain instructions 10020 improperly 10021 * [280]10838 java.io.ObjectInputStream syntax error 10022 * [281]10886 The RMI registry that comes with GCJ does not work 10023 correctly 10024 * [282]11349 JNDI URL context factories not located correctly 10025 10026 x86-specific (Intel/AMD) 10027 10028 * [283]4823 ICE on inline assembly code 10029 * [284]8878 miscompilation with -O and SSE 10030 * [285]9815 (c++ library) atomicity.h - fails to compile with -O3 10031 -masm=intel 10032 * [286]10402 (inline assembly) [x86] ICE in merge_assigned_reloads, 10033 in reload1.c 10034 * [287]10504 ICE with SSE2 code and -O3 -mcpu=pentium4 -msse2 10035 * [288]10673 ICE for x86-64 on freebsd libc vfprintf.c source 10036 * [289]11044 [x86] out of range loop instructions for FP code on K6 10037 * [290]11089 ICE: instantiate_virtual_regs_lossage while using SSE 10038 built-ins 10039 * [291]11420 [x86_64] gcc generates invalid asm code when "-O -fPIC" 10040 is used 10041 10042 SPARC- or Solaris- specific 10043 10044 * [292]9362 solaris 'as' dies when fed .s and "-gstabs" 10045 * [293]10142 [SPARC64] gcc produces wrong code when passing 10046 structures by value 10047 * [294]10663 New configure check aborts with Sun tools. 10048 * [295]10835 combinatorial explosion in scheduler on HyperSPARC 10049 * [296]10876 ICE in calculate_giv_inc when building KDE 10050 * [297]10955 wrong code at -O3 for structure argument in context of 10051 structure return 10052 * [298]11018 -mcpu=ultrasparc busts tar-1.13.25 10053 * [299]11556 [sparc64] ICE in gen_reg_rtx() while compiling 2.6.x 10054 Linux kernel 10055 10056 ia64 specific 10057 10058 * [300]10907 gcc violates the ia64 ABI (GP must be preserved) 10059 * [301]11320 scheduler bug (in machine depended reorganization pass) 10060 * [302]11599 bug with conditional and __builtin_prefetch 10061 10062 PowerPC specific 10063 10064 * [303]9745 [powerpc] gcc mis-compiles libmcrypt (alias problem 10065 during loop) 10066 * [304]10871 error in rs6000_stack_info save_size computation 10067 * [305]11440 gcc mis-compiles c++ code (libkhtml) with -O2, -fno-gcse 10068 cures it 10069 10070 m68k-specific 10071 10072 * [306]7594 [m68k] ICE on legal code associated with simplify-rtx 10073 * [307]10557 [m68k] ICE in subreg_offset_representable_p 10074 * [308]11054 [m68k] ICE in reg_overlap_mentioned_p 10075 10076 ARM-specific 10077 10078 * [309]10834 [arm] GCC 3.3 still generates incorrect instructions for 10079 functions with __attribute__ ((interrupt ("IRQ"))) 10080 * [310]10842 [arm] Clobbered link register is copied to pc under 10081 certain circumstances 10082 * [311]11052 [arm] noce_process_if_block() can lose REG_INC notes 10083 * [312]11183 [arm] ICE in change_address_1 (3.3) / subreg_hard_regno 10084 (3.4) 10085 10086 MIPS-specific 10087 10088 * [313]11084 ICE in propagate_one_insn, in flow.c 10089 10090 SH-specific 10091 10092 * [314]10331 can't compile c++ part of gcc cross compiler for sh-elf 10093 * [315]10413 [SH] ICE in reload_cse_simplify_operands, in reload1.c 10094 * [316]11096 i686-linux to sh-linux cross compiler fails to compile 10095 C++ files 10096 10097 GNU/Linux (or Hurd?) specific 10098 10099 * [317]2873 Bogus fixinclude of stdio.h from glibc 2.2.3 10100 10101 UnixWare specific 10102 10103 * [318]3163 configure bug: gcc/aclocal.m4 mmap test fails on UnixWare 10104 7.1.1 10105 10106 Cygwin (or mingw) specific 10107 10108 * [319]5287 ICE with dllimport attribute 10109 * [320]10148 [MingW/CygWin] Compiler dumps core 10110 10111 DJGPP specific 10112 10113 * [321]8787 GCC fails to emit .intel_syntax when invoked with 10114 -masm=intel on DJGPP 10115 10116 Darwin (and MacOS X) specific 10117 10118 * [322]10900 trampolines crash 10119 10120 Documentation 10121 10122 * [323]1607 (c++) Format attributes on methods undocumented 10123 * [324]4252 Invalid option `-fdump-translation-unit' 10124 * [325]4490 Clarify restrictions on -m96bit-long-double, 10125 -m128bit-long-double 10126 * [326]10355 document an issue with regparm attribute on some systems 10127 (e.g. Solaris) 10128 * [327]10726 (fortran) Documentation for function "IDate Intrinsic 10129 (Unix)" is wrong 10130 * [328]10805 document bug in old version of Sun assembler 10131 * [329]10815 warn against GNU binutils on AIX 10132 * [330]10877 document need for newer binutils on i?86-*-linux-gnu 10133 * [331]11280 Manual incorrect with respect to -freorder-blocks 10134 * [332]11466 Document -mlittle-endian and its restrictions for the 10135 sparc64 port 10136 10137 Testsuite bugs (compiler itself is not affected) 10138 10139 * [333]10737 newer bison causes g++.dg/parse/crash2.C to incorrectly 10140 report failure 10141 * [334]10810 gcc-3.3 fails make check: buffer overrun in 10142 test_demangle.c 10143 __________________________________________________________________ 10144 10145 GCC 3.3.2 10146 10147 Bug Fixes 10148 10149 This section lists the problem reports (PRs) from [335]GCC's bug 10150 tracking system that are known to be fixed in the 3.3.2 release. This 10151 list might not be complete (that is, it is possible that some PRs that 10152 have been fixed are not listed here). 10153 10154 Bootstrap failures and problems 10155 10156 * [336]8336 [SCO5] bootstrap config still tries to use COFF options 10157 * [337]9330 [alpha-osf] Bootstrap failure on Compaq Tru64 with 10158 --enable-threads=posix 10159 * [338]9631 [hppa64-linux] gcc-3.3 fails to bootstrap 10160 * [339]9877 fixincludes makes a bad sys/byteorder.h on svr5 (UnixWare 10161 7.1.1) 10162 * [340]11687 xstormy16-elf build fails in libf2c 10163 * [341]12263 [SGI IRIX] bootstrap fails during compile of 10164 libf2c/libI77/backspace.c 10165 * [342]12490 buffer overflow in scan-decls.c (during Solaris 9 10166 fix-header processing) 10167 10168 Internal compiler errors (multi-platform) 10169 10170 * [343]7277 Casting integers to vector types causes ICE 10171 * [344]7939 (c++) ICE on invalid function template specialization 10172 * [345]11063 (c++) ICE on parsing initialization list of const array 10173 member 10174 * [346]11207 ICE with negative index in array element designator 10175 * [347]11522 (fortran) g77 dwarf-2 ICE in 10176 add_abstract_origin_attribute 10177 * [348]11595 (c++) ICE on duplicate label definition 10178 * [349]11646 (c++) ICE in commit_one_edge_insertion with 10179 -fnon-call-exceptions -fgcse -O 10180 * [350]11665 ICE in struct initializer when taking address 10181 * [351]11852 (c++) ICE with bad struct initializer. 10182 * [352]11878 (c++) ICE in cp_expr_size 10183 * [353]11883 ICE with any -O on mercury-generated C code 10184 * [354]11991 (c++) ICE in cxx_incomplete_type_diagnostic, in 10185 cp/typeck2.c when applying typeid operator to template template 10186 parameter 10187 * [355]12146 ICE in lookup_template_function, in cp/pt.c 10188 * [356]12215 ICE in make_label_edge with -fnon-call-exceptions 10189 -fno-gcse -O2 10190 * [357]12369 (c++) ICE with templates and friends 10191 * [358]12446 ICE in emit_move_insn on complicated array reference 10192 * [359]12510 ICE in final_scan_insn 10193 * [360]12544 ICE with large parameters used in nested functions 10194 10195 C and optimization bugs 10196 10197 * [361]9862 spurious warnings with -W -finline-functions 10198 * [362]10962 lookup_field is a linear search on a linked list (can be 10199 slow if large struct) 10200 * [363]11370 -Wunreachable-code gives false complaints 10201 * [364]11637 invalid assembly with -fnon-call-exceptions 10202 * [365]11885 Problem with bitfields in packed structs 10203 * [366]12082 Inappropriate unreachable code warnings 10204 * [367]12180 Inline optimization fails for variadic function 10205 * [368]12340 loop unroller + gcse produces wrong code 10206 10207 C++ compiler and library 10208 10209 * [369]3907 nested template parameter collides with member name 10210 * [370]5293 confusing message when binding a temporary to a reference 10211 * [371]5296 [DR115] Pointers to functions and to template functions 10212 behave differently in deduction 10213 * [372]7939 ICE on function template specialization 10214 * [373]8656 Unable to assign function with __attribute__ and pointer 10215 return type to an appropriate variable 10216 * [374]10147 Confusing error message for invalid template function 10217 argument 10218 * [375]11400 std::search_n() makes assumptions about Size parameter 10219 * [376]11409 issues with using declarations, overloading, and 10220 built-in functions 10221 * [377]11740 ctype<wchar_t>::do_is(mask, wchar_t) doesn't handle 10222 multiple bits in mask 10223 * [378]11786 operator() call on variable in other namespace not 10224 recognized 10225 * [379]11867 static_cast ignores ambiguity 10226 * [380]11928 bug with conversion operators that are typedefs 10227 * [381]12114 Uninitialized memory accessed in dtor 10228 * [382]12163 static_cast + explicit constructor regression 10229 * [383]12181 Wrong code with comma operator and c++ 10230 * [384]12236 regparm and fastcall messes up parameters 10231 * [385]12266 incorrect instantiation of unneeded template during 10232 overload resolution 10233 * [386]12296 istream::peek() doesn't set eofbit 10234 * [387]12298 [sjlj exceptions] Stack unwind destroys 10235 not-yet-constructed object 10236 * [388]12369 ICE with templates and friends 10237 * [389]12337 apparently infinite loop in g++ 10238 * [390]12344 stdcall attribute ignored if function returns a pointer 10239 * [391]12451 missing(late) class forward declaration in cxxabi.h 10240 * [392]12486 g++ accepts invalid use of a qualified name 10241 10242 x86 specific (Intel/AMD) 10243 10244 * [393]8869 [x86 MMX] ICE with const variable optimization and MMX 10245 builtins 10246 * [394]9786 ICE in fixup_abnormal_edges with -fnon-call-exceptions 10247 -O2 10248 * [395]11689 g++3.3 emits un-assembleable code for k6 architecture 10249 * [396]12116 [k6] Invalid assembly output values with X-MAME code 10250 * [397]12070 ICE converting between double and long double with 10251 -msoft-float 10252 10253 ia64-specific 10254 10255 * [398]11184 [ia64 hpux] ICE on __builtin_apply building libobjc 10256 * [399]11535 __builtin_return_address may not work on ia64 10257 * [400]11693 [ia64] ICE in gen_nop_type 10258 * [401]12224 [ia64] Thread-local storage doesn't work 10259 10260 PowerPC-specific 10261 10262 * [402]11087 [powerpc64-linux] GCC miscompiles raid1.c from linux 10263 kernel 10264 * [403]11319 loop miscompiled on ppc32 10265 * [404]11949 ICE Compiler segfault with ffmpeg -maltivec code 10266 10267 SPARC-specific 10268 10269 * [405]11662 wrong code for expr. with cast to long long and 10270 exclusive or 10271 * [406]11965 invalid assembler code for a shift < 32 operation 10272 * [407]12301 (c++) stack corruption when a returned expression throws 10273 an exception 10274 10275 Alpha-specific 10276 10277 * [408]11717 [alpha-linux] unrecognizable insn compiling for.c of 10278 kernel 2.4.22-pre8 10279 10280 HPUX-specific 10281 10282 * [409]11313 problem with #pragma weak and static inline functions 10283 * [410]11712 __STDC_EXT__ not defined for C++ by default anymore? 10284 10285 Solaris specific 10286 10287 * [411]12166 Profiled programs crash if PROFDIR is set 10288 10289 Solaris-x86 specific 10290 10291 * [412]12101 i386 Solaris no longer works with GNU as? 10292 10293 Miscellaneous embedded target-specific bugs 10294 10295 * [413]10988 [m32r-elf] wrong blockmove code with -O3 10296 * [414]11805 [h8300-unknown-coff] [H8300] ICE for simple code with 10297 -O2 10298 * [415]11902 [sh4] spec file improperly inserts rpath even when none 10299 needed 10300 * [416]11903 [sh4] -pthread fails to link due to error in spec file 10301 on sh4 10302 __________________________________________________________________ 10303 10304 GCC 3.3.3 10305 10306 Minor features 10307 10308 In addition to the bug fixes documented below, this release contains 10309 few minor features such as: 10310 * Support for --with-sysroot 10311 * Support for automatic detection of executable stacks 10312 * Support for SSE3 instructions 10313 * Support for thread local storage debugging under GDB on S390 10314 10315 Bug Fixes 10316 10317 This section lists the problem reports (PRs) from [417]GCC's bug 10318 tracking system that are known to be fixed in the 3.3.3 release. This 10319 list might not be complete (that is, it is possible that some PRs that 10320 have been fixed are not listed here). 10321 10322 Bootstrap failures and issues 10323 10324 * [418]11890 Building cross gcc-3.3.1 for sparc-sun-solaris2.6 fails 10325 * [419]12399 boehm-gc fails (when building a cross compiler): libtool 10326 unable to infer tagged configuration 10327 * [420]13068 mklibgcc.in doesn't handle multi-level multilib 10328 subdirectories properly 10329 10330 Internal compiler errors (multi-platform) 10331 10332 * [421]10060 ICE (stack overflow) on huge file (300k lines) due to 10333 recursive behaviour of copy_rtx_if_shared, in emit_rtl.c 10334 * [422]10555 (c++) ICE on undefined template argument 10335 * [423]10706 (c++) ICE in mangle_class_name_for_template 10336 * [424]11496 (fortran) error in flow_loops_find when -funroll-loops 10337 active 10338 * [425]11741 ICE in pre_insert_copy_insn, in gcse.c 10339 * [426]12440 GCC crashes during compilation of quicktime4linux 2.0.0 10340 * [427]12632 (fortran) -fbounds-check ICE 10341 * [428]12712 (c++) ICE on short legit C++ code fragment with gcc 10342 3.3.2 10343 * [429]12726 (c++) ICE (segfault) on trivial code 10344 * [430]12890 (c++) ICE on compilation of class with throwing method 10345 * [431]12900 (c++) ICE in rtl_verify_flow_info_1 10346 * [432]13060 (fortran) ICE in fixup_var_refs_1, in function.c on 10347 correct code with -O2 -fno-force-mem 10348 * [433]13289 (c++) ICE in regenerate_decl_from_template on recursive 10349 template 10350 * [434]13318 ICE: floating point exception in the loop optimizer 10351 * [435]13392 (c++) ICE in convert_from_eh_region_ranges_1, in 10352 except.c 10353 * [436]13574 (c++) invalid array default initializer in class lets 10354 gcc consume all memory and die 10355 * [437]13475 ICE on SIMD variables with partial value initialization 10356 * [438]13797 (c++) ICE on invalid template parameter 10357 * [439]13824 (java) gcj SEGV with simple .java program 10358 10359 C and optimization bugs 10360 10361 * [440]8776 loop invariants are not removed (most likely) 10362 * [441]10339 [sparc,ppc,ppc64] Invalid optimization: replacing 10363 strncmp by memcmp 10364 * [442]11350 undefined labels with -Os -fPIC 10365 * [443]12826 Optimizer removes reference through volatile pointer 10366 * [444]12500 stabs debug info: void no longer a predefined / builtin 10367 type 10368 * [445]12941 builtin-bitops-1.c miscompilation (latent bug) 10369 * [446]12953 tree inliner bug (in inline_forbidden_p) and fix 10370 * [447]13041 linux-2.6/sound/core/oss/rate.c miscompiled 10371 * [448]13507 spurious printf format warning 10372 * [449]13382 Type information for const pointer disappears during 10373 optimization. 10374 * [450]13394 noreturn attribute ignored on recursive invokation 10375 * [451]13400 Compiled code crashes storing to read-only location 10376 * [452]13521 Endless loop in calculate_global_regs_live 10377 10378 C++ compiler and library 10379 10380 Some of the bug fixes in this list were made to implement decisions 10381 that the ISO C++ standards committee has made concerning several defect 10382 reports (DRs). Links in the list below point to detailed discussion of 10383 the relevant defect report. 10384 * [453]2094 unimplemented: use of `ptrmem_cst' in template type 10385 unification 10386 * [454]2294 using declaration confusion 10387 * [455]5050 template instantiation depth exceeds limit: recursion 10388 problem? 10389 * [456]9371 Bad exception handling in 10390 i/ostream::operator>>/<<(streambuf*) 10391 * [457]9546 bad exception handling in ostream members 10392 * [458]10081 basic_ios::_M_cache_locale leaves NULL members in the 10393 face of unknown locales 10394 * [459]10093 [460][DR 61] Setting failbit in exceptions doesn't work 10395 * [461]10095 istream::operator>>(int&) sets ios::badbit when 10396 ios::failbit is set. 10397 * [462]11554 Warning about reordering of initializers doesn't mention 10398 location of constructor 10399 * [463]12297 istream::sentry::sentry() handles eof() incorrectly. 10400 * [464]12352 Exception safety problems in src/localename.cc 10401 * [465]12438 Memory leak in locale::combine() 10402 * [466]12540 Memory leak in locale::locale(const char*) 10403 * [467]12594 DRs [468]60 [TC] and [469]63 [TC] not implemented 10404 * [470]12657 Resolution of [471]DR 292 (WP) still unimplemented 10405 * [472]12696 memory eating infinite loop in diagnostics (error 10406 recovery problem) 10407 * [473]12815 Code compiled with optimization behaves unexpectedly 10408 * [474]12862 Conflicts between typedefs/enums and namespace member 10409 declarations 10410 * [475]12926 Wrong value after assignment in initialize list using 10411 bit-fields 10412 * [476]12967 Resolution of [477]DR 300 [WP] still unimplemented 10413 * [478]12971 Resolution of [479]DR 328 [WP] still unimplemented 10414 * [480]13007 basic_streambuf::pubimbue, imbue wrong 10415 * [481]13009 Implicitly-defined assignment operator writes to wrong 10416 memory 10417 * [482]13057 regparm attribute not applied to destructor 10418 * [483]13070 -Wformat option ignored in g++ 10419 * [484]13081 forward template declarations in <complex> let inlining 10420 fail 10421 * [485]13239 Assertion does not seem to work correctly anymore 10422 * [486]13262 "xxx is private within this context" when initializing a 10423 self-contained template class 10424 * [487]13290 simple typo in concept checking for std::generate_n 10425 * [488]13323 Template code does not compile in presence of typedef 10426 * [489]13369 __verify_grouping (and __add_grouping?) not correct 10427 * [490]13371 infinite loop with packed struct and inlining 10428 * [491]13445 Template argument replacement "dereferences" a typedef 10429 * [492]13461 Fails to access protected-ctor from public constant 10430 * [493]13462 Non-standard-conforming type set::pointer 10431 * [494]13478 gcc uses wrong constructor to initialize a const 10432 reference 10433 * [495]13544 "conflicting types" for enums in different scopes 10434 * [496]13650 string::compare should not (always) use 10435 traits_type::length() 10436 * [497]13683 bogus warning about passing non-PODs through ellipsis 10437 * [498]13688 Derived class is denied access to protected base class 10438 member class 10439 * [499]13774 Member variable cleared in virtual multiple inheritance 10440 class 10441 * [500]13884 Protect sstream.tcc from extern template use 10442 10443 Java compiler and library 10444 10445 * [501]10746 [win32] garbage collection crash in GCJ 10446 10447 Objective-C compiler and library 10448 10449 * [502]11433 Crash due to dereferencing null pointer when querying 10450 protocol 10451 10452 Fortran compiler and library 10453 10454 * [503]12633 logical expression gives incorrect result with 10455 -fugly-logint option 10456 * [504]13037 [gcse-lm] g77 generates incorrect code 10457 * [505]13213 Hex constant problem when compiling with -fugly-logint 10458 and -ftypeless-boz 10459 10460 x86-specific (Intel/AMD) 10461 10462 * [506]4490 ICE with -m128bit-long-double 10463 * [507]12292 [x86_64] ICE: RTL check: expected code `const_int', have 10464 `reg' in make_field_assignment, in combine.c 10465 * [508]12441 ICE: can't find a register to spill 10466 * [509]12943 array static-init failure under -fpic, -fPIC 10467 * [510]13608 Incorrect code with -O3 -ffast-math 10468 10469 PowerPC-specific 10470 10471 * [511]11598 testcase gcc.dg/20020118-1.c fails runtime check of 10472 __attribute__((aligned(16))) 10473 * [512]11793 ICE in extract_insn, in recog.c (const_vector's) 10474 * [513]12467 vmsumubm emitted when vmsummbm appropriate (typo in 10475 altivec.md) 10476 * [514]12537 g++ generates writeable text sections 10477 10478 SPARC-specific 10479 10480 * [515]12496 wrong result for __atomic_add(&value, -1) when using -O0 10481 -m64 10482 * [516]12865 mprotect call to make trampoline executable may fail 10483 * [517]13354 ICE in sparc_emit_set_const32 10484 10485 ARM-specific 10486 10487 * [518]10467 [arm] ICE in pre_insert_copy_insn, 10488 10489 ia64-specific 10490 10491 * [519]11226 ICE passing struct arg with two floats 10492 * [520]11227 ICE for _Complex float, _Complex long double args 10493 * [521]12644 GCC 3.3.2 fails to compile glibc on ia64 10494 * [522]13149 build gcc-3.3.2 1305 error:unrecognizable insn 10495 * Various fixes for libunwind 10496 10497 Alpha-specific 10498 10499 * [523]12654 Incorrect comparison code generated for Alpha 10500 * [524]12965 SEGV+ICE in cc1plus on alpha-linux with -O2 10501 * [525]13031 ICE (unrecognizable insn) when building gnome-libs-1.4.2 10502 10503 HPPA-specific 10504 10505 * [526]11634 [hppa] ICE in verify_local_live_at_start, in flow.c 10506 * [527]12158 [hppa] compilation does not terminate at -O1 10507 10508 S390-specific 10509 10510 * [528]11992 Wrong built-in code for memcmp with length 1<<24: only 10511 (1<<24)-1 possible for CLCL-Instruction 10512 10513 SH-specific 10514 10515 * [529]9365 segfault in gen_far_branch (config/sh/sh.c) 10516 * [530]10392 optimizer generates faulty array indexing 10517 * [531]11322 SH profiler outputs multiple definitions of symbol 10518 * [532]13069 gcc/config/sh/rtems.h broken 10519 * [533]13302 Putting a va_list in a struct causes seg fault 10520 * [534]13585 Incorrect optimization of call to sfunc 10521 * Fix inappropriately exported libgcc functions from the shared 10522 library 10523 10524 Other embedded target specific 10525 10526 * [535]8916 [mcore] unsigned char assign gets hosed. 10527 * [536]11576 [h8300] ICE in change_address_1, in emit-rtl.c 10528 * [537]13122 [h8300] local variable gets corrupted by function call 10529 when -fomit-frame-pointer is given 10530 * [538]13256 [cris] strict_low_part mistreated in delay slots 10531 * [539]13373 [mcore] optimization with -frerun-cse-after-loop 10532 -fexpensive-optimizations produces wrong code on mcore 10533 10534 GNU HURD-specific 10535 10536 * [540]12561 gcc/config/t-gnu needs updating to work with 10537 --with-sysroot 10538 10539 Tru64 Unix specific 10540 10541 * [541]6243 testsuite fails almost all tests due to no libintl in 10542 LD_LIBRARY_PATH during test. 10543 * [542]11397 weak aliases broken on Tru64 UNIX 10544 10545 AIX-specific 10546 10547 * [543]12505 build failure due to defines of uchar in cpphash.h and 10548 sys/types.h 10549 * [544]13150 WEAK symbols not exported by collect2 10550 10551 IRIX-specific 10552 10553 * [545]12666 fixincludes problem on IRIX 6.5.19m 10554 10555 Solaris-specific 10556 10557 * [546]12969 Including sys/byteorder.h breaks configure checks 10558 10559 Testsuite problems (compiler is not affected) 10560 10561 * [547]10819 testsuite creates CR+LF on compiler version lines in 10562 test summary files 10563 * [548]11612 abi_check not finding correct libgcc_s.so.1 10564 10565 Miscellaneous 10566 10567 * [549]13211 using -###, incorrect warnings about unused linker file 10568 are produced 10569 __________________________________________________________________ 10570 10571 GCC 3.3.4 10572 10573 This is the [550]list of problem reports (PRs) from GCC's bug tracking 10574 system that are known to be fixed in the 3.3.4 release. This list might 10575 not be complete (that is, it is possible that some PRs that have been 10576 fixed are not listed here). 10577 __________________________________________________________________ 10578 10579 GCC 3.3.5 10580 10581 This is the [551]list of problem reports (PRs) from GCC's bug tracking 10582 system that are known to be fixed in the 3.3.5 release. This list might 10583 not be complete (that is, it is possible that some PRs that have been 10584 fixed are not listed here). 10585 __________________________________________________________________ 10586 10587 GCC 3.3.6 10588 10589 This is the [552]list of problem reports (PRs) from GCC's bug tracking 10590 system that are known to be fixed in the 3.3.6 release. This list might 10591 not be complete (that is, it is possible that some PRs that have been 10592 fixed are not listed here). 10593 10594 10595 For questions related to the use of GCC, please consult these web 10596 pages and the [553]GCC manuals. If that fails, the 10597 [554]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 10598 web pages and the development of GCC are welcome on our developer 10599 list at [555]gcc (a] gcc.gnu.org. All of [556]our lists have public 10600 archives. 10601 10602 Copyright (C) [557]Free Software Foundation, Inc. Verbatim copying and 10603 distribution of this entire article is permitted in any medium, 10604 provided this notice is preserved. 10605 10606 These pages are [558]maintained by the GCC team. 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====================================================================== 11171 http://gcc.gnu.org/gcc-3.2/index.html 11172 11173 GCC 3.2 Release Series 11174 11175 April 25, 2003 11176 11177 The [1]GNU project and the GCC developers are pleased to announce the 11178 release of GCC 3.2.3. 11179 11180 The purpose of the GCC 3.2 release series is to provide a stable 11181 platform for OS distributors to use building their next releases. A 11182 primary objective was to stabilize the C++ ABI; we believe that the 11183 interface to the compiler and the C++ standard library are now 11184 relatively stable. 11185 11186 Be aware that C++ code compiled by GCC 3.2.x will (in general) not 11187 interoperate with code compiled by GCC 3.1.1 or earlier. 11188 11189 Please refer to our [2]detailed list of news, caveats, and bug-fixes 11190 for further information. 11191 11192 Release History 11193 11194 GCC 3.2.3 11195 April 25, 2003 ([3]changes) 11196 11197 GCC 3.2.2 11198 February 5, 2003 ([4]changes) 11199 11200 GCC 3.2.1 11201 November 19, 2002 ([5]changes) 11202 11203 GCC 3.2 11204 August 14, 2002 ([6]changes) 11205 11206 References and Acknowledgements 11207 11208 GCC used to stand for the GNU C Compiler, but since the compiler 11209 supports several other languages aside from C, it now stands for the 11210 GNU Compiler Collection. 11211 11212 A list of [7]successful builds is updated as new information becomes 11213 available. 11214 11215 The GCC developers would like to thank the numerous people that have 11216 contributed new features, improvements, bug fixes, and other changes as 11217 well as test results to GCC. This [8]amazing group of volunteers is 11218 what makes GCC successful. 11219 11220 For additional information about GCC please refer to the [9]GCC project 11221 web site or contact the [10]GCC development mailing list. 11222 11223 To obtain GCC please use [11]our mirror sites, or our CVS server. 11224 11225 11226 For questions related to the use of GCC, please consult these web 11227 pages and the [12]GCC manuals. If that fails, the 11228 [13]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 11229 web pages and the development of GCC are welcome on our developer 11230 list at [14]gcc (a] gcc.gnu.org. All of [15]our lists have public 11231 archives. 11232 11233 Copyright (C) [16]Free Software Foundation, Inc. Verbatim copying and 11234 distribution of this entire article is permitted in any medium, 11235 provided this notice is preserved. 11236 11237 These pages are [17]maintained by the GCC team. Last modified 11238 2012-11-02[18]. 11239 11240 References 11241 11242 1. http://www.gnu.org/ 11243 2. http://gcc.gnu.org/gcc-3.2/changes.html 11244 3. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.3 11245 4. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.2 11246 5. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.1 11247 6. http://gcc.gnu.org/gcc-3.2/changes.html#3.2 11248 7. http://gcc.gnu.org/gcc-3.2/buildstat.html 11249 8. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 11250 9. http://gcc.gnu.org/index.html 11251 10. mailto:gcc (a] gcc.gnu.org 11252 11. http://gcc.gnu.org/mirrors.html 11253 12. http://gcc.gnu.org/onlinedocs/ 11254 13. mailto:gcc-help (a] gcc.gnu.org 11255 14. mailto:gcc (a] gcc.gnu.org 11256 15. http://gcc.gnu.org/lists.html 11257 16. http://www.fsf.org/ 11258 17. http://gcc.gnu.org/about.html 11259 18. http://validator.w3.org/check/referer 11260 ====================================================================== 11261 http://gcc.gnu.org/gcc-3.2/changes.html 11262 11263 GCC 3.2 Release Series 11264 Changes, New Features, and Fixes 11265 11266 The latest release in the 3.2 release series is [1]GCC 3.2.3. 11267 11268 Caveats and New Features 11269 11270 Caveats 11271 11272 * The C++ compiler does not correctly zero-initialize 11273 pointers-to-data members. You must explicitly initialize them. For 11274 example: int S::*m(0); will work, but depending on 11275 default-initialization to zero will not work. This bug cannot be 11276 fixed in GCC 3.2 without inducing unacceptable risks. It will be 11277 fixed in GCC 3.3. 11278 * This GCC release is based on the GCC 3.1 sourcebase, and thus has 11279 all the [2]changes in the GCC 3.1 series. In addition, GCC 3.2 has 11280 a number of C++ ABI fixes which make its C++ compiler generate 11281 binary code which is incompatible with the C++ compilers found in 11282 earlier GCC releases, including GCC 3.1 and GCC 3.1.1. 11283 11284 Frontend Enhancements 11285 11286 C/C++/Objective-C 11287 11288 * The method of constructing the list of directories to be searched 11289 for header files has been revised. If a directory named by a -I 11290 option is a standard system include directory, the option is 11291 ignored to ensure that the default search order for system 11292 directories and the special treatment of system header files are 11293 not defeated. 11294 * The C and Objective-C compilers no longer accept the "Naming Types" 11295 extension (typedef foo = bar); it was already unavailable in C++. 11296 Code which uses it will need to be changed to use the "typeof" 11297 extension instead: typedef typeof(bar) foo. (We have removed this 11298 extension without a period of deprecation because it has caused the 11299 compiler to crash since version 3.0 and no one noticed until very 11300 recently. Thus we conclude it is not in widespread use.) 11301 11302 C++ 11303 11304 * GCC 3.2 fixed serveral differences between the C++ ABI implemented 11305 in GCC and the multi-vendor standard, but more have been found 11306 since the release. 3.2.1 adds a new warning, -Wabi, to warn about 11307 code which is affected by these bugs. We will fix these bugs in 11308 some future release, once we are confident that all have been 11309 found; until then, it is our intention to make changes to the ABI 11310 only if they are necessary for correct compilation of C++, as 11311 opposed to conformance to the ABI documents. 11312 * For details on how to build an ABI compliant compiler for GNU/Linux 11313 systems, check the [3]common C++ ABI page. 11314 11315 New Targets and Target Specific Improvements 11316 11317 IA-32 11318 11319 * Fixed a number of bugs in SSE and MMX intrinsics. 11320 * Fixed common compiler crashes with SSE instruction set enabled 11321 (implied by -march=pentium3, pentium4, athlon-xp) 11322 * __m128 and __m128i is not 128bit aligned when used in structures. 11323 11324 x86-64 11325 11326 * A bug whereby the compiler could generate bad code for bzero has 11327 been fixed. 11328 * ABI fixes (implying ABI incompatibilities with previous version in 11329 some corner cases) 11330 * Fixed prefetch code generation 11331 __________________________________________________________________ 11332 11333 GCC 3.2.3 11334 11335 3.2.3 is a bug fix release only; there are no new features that were 11336 not present in GCC 3.2.2. 11337 11338 Bug Fixes 11339 11340 This section lists the problem reports (PRs) from GCC's bug tracking 11341 system that are known to be fixed in the 3.2.3 release. This list might 11342 not be complete (that is, it is possible that some PRs that have been 11343 fixed are not listed here), and some of the titles have been changed to 11344 make them more clear. 11345 11346 Internal Compiler Errors (multi-platform) 11347 11348 * [4]3782: (c++) -quiet -fstats produces a segmentation fault in 11349 cc1plus 11350 * [5]6440: (c++) template specializations cause ICE 11351 * [6]7050: (c++) ICE on: (i ? get_string() : throw) 11352 * [7]7741: ICE on conflicting types (make_decl_rtl in varasm.c) 11353 * [8]7982: (c++) ICE due to infinite recursion (using STL set) 11354 * [9]8068: exceedingly high (infinite) memory usage 11355 * [10]8178: ICE with __builtin_ffs 11356 * [11]8396: ICE in copy_to_mode_reg, in explow.c 11357 * [12]8674: (c++) ICE in cp_expr_size, in cp/cp-lang.c 11358 * [13]9768: ICE when optimizing inline code at -O2 11359 * [14]9798: (c++) Infinite recursion (segfault) in 11360 cp/decl.c:push_using_directive with recursive using directives 11361 * [15]9799: mismatching structure initializer with nested flexible 11362 array member: ICE 11363 * [16]9928: ICE on duplicate enum declaration 11364 * [17]10114: ICE in mem_loc_descriptor, in dwarf2out.c (affects 11365 sparc, alpha) 11366 * [18]10352: ICE in find_reloads_toplev 11367 * [19]10336: ICE with -Wunreachable-code 11368 11369 C/optimizer bugs: 11370 11371 * [20]8224: Incorrect joining of signed and unsigned division 11372 * [21]8613: -O2 produces wrong code with builtin strlen and 11373 postincrements 11374 * [22]8828: gcc reports some code is unreachable when it is not 11375 * [23]9226: GCSE breaking argument passing 11376 * [24]9853: miscompilation of non-constant structure initializer 11377 * [25]9797: C99-style struct initializers are miscompiled 11378 * [26]9967: Some standard C function calls should not be replaced 11379 when optimizing for size 11380 * [27]10116: ce2: invalid merge of join_bb in the context of switch 11381 statements 11382 * [28]10171: wrong code for inlined function 11383 * [29]10175: -Wunreachable-code doesn't work for single lines 11384 11385 C++ compiler and library: 11386 11387 * [30]8316: Confusing diagnostic for code that misuses conversion 11388 operators 11389 * [31]9169: filebuf output fails if codecvt<>::out returns noconv 11390 * [32]9420: incomplete type incorrectly reported 11391 * [33]9459: typeof in return type specification of template not 11392 supported 11393 * [34]9507: filebuf::open handles ios_base::ate incorrectly 11394 * [35]9538: Out-of-bounds memory access in streambuf::sputbackc 11395 * [36]9602: Total confusion about template/friend/virtual/abstract 11396 * [37]9993: destructor not called for local object created within and 11397 returned from infinite loop 11398 * [38]10167: ieee_1003.1-2001 locale specialisations on a glibc-2.3.2 11399 system 11400 11401 Java compiler and library: 11402 11403 * [39]9652: libgcj build fails on irix6.5.1[78] 11404 * [40]10144: gas on solaris complains about bad .stabs lines for 11405 java, native as unaffected 11406 11407 x86-specific (Intel/AMD): 11408 11409 * [41]8746: gcc miscompiles Linux kernel ppa driver on x86 11410 * [42]9888: -mcpu=k6 -Os produces out of range loop instructions 11411 * [43]9638: Cross-build for target i386-elf and i586-pc-linux-gnu 11412 failed 11413 * [44]9954: Cross-build for target i586-pc-linux-gnu (--with-newlib) 11414 failed 11415 11416 SPARC-specific: 11417 11418 * [45]7784: [Sparc] ICE in extract_insn, in recog.c 11419 * [46]7796: sparc extra failure with -m64 on execute/930921-1.c in 11420 unroll.c 11421 * [47]8281: ICE when compiling with -O2 -fPIC for Ultrasparc 11422 * [48]8366: [Sparc] C testsuite failure with -m64 -fpic -O in 11423 execute/loop-2d.c 11424 * [49]8726: gcc -O2 miscompiles Samba 2.2.7 on 32-bit sparc 11425 * [50]9414: Scheduling bug on Ultrasparc 11426 * [51]10067: GCC-3.2.2 outputs invalid asm on sparc64 11427 11428 m68k-specific: 11429 11430 * [52]7248: broken "inclusive or" code 11431 * [53]8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1 11432 11433 PowerPC-specific: 11434 11435 * [54]9732: Wrong code with -O2 -fPIC 11436 * [55]10073: ICE: powerpc cannot split insn 11437 11438 Alpha-specific: 11439 11440 * [56]7702: optimization problem on a DEC alpha under OSF1 11441 * [57]9671: gcc.3.2.2 does not build on a HP Tru64 Unix v5.1B system 11442 11443 HP-specific: 11444 11445 * [58]8694: <string> breaks <ctype.h> on HP-UX 10.20 (DUP: 9275) 11446 * [59]9953: (ada) gcc 3.2.x can't build 3.3-branch ada on HP-UX 10 11447 (missing symbol) 11448 * [60]10271: Floating point args don't get reloaded across function 11449 calls with -O2 11450 11451 MIPS specific: 11452 11453 * [61]6362: mips-irix6 gcc-3.1 C testsuite failure with -mips4 in 11454 compile/920501-4.c 11455 11456 CRIS specific: 11457 11458 * [62]10377: gcc-3.2.2 creates bad assembler code for cris 11459 11460 Miscellaneous and minor bugs: 11461 11462 * [63]6955: collect2 says "core dumped" when there is no core 11463 __________________________________________________________________ 11464 11465 GCC 3.2.2 11466 11467 Beginning with 3.2.2, GCC's Makefile suite supports redirection of make 11468 install by means of the DESTDIR variable. Parts of the GCC tree have 11469 featured that support long before, but now it is available even from 11470 the top level. 11471 11472 Other than that, GCC 3.2.2 is a bug fix release only; there are no new 11473 features that were not present in GCC 3.2.1. 11474 11475 Bug Fixes 11476 11477 On the following i386-based systems GCC 3.2.1 broke the C ABI wrt. 11478 functions returning structures: Cygwin, FreeBSD (GCC 3.2.1 as shipped 11479 with FreeBSD 5.0 does not have this problem), Interix, a.out-based 11480 GNU/Linux and NetBSD, OpenBSD, and Darwin. GCC 3.2.2 reverts this ABI 11481 change, and thus restores ABI-compatibility with previous releases 11482 (except GCC 3.2.1) on these platforms. 11483 11484 This section lists the problem reports (PRs) from GCC's bug tracking 11485 system that are known to be fixed in the 3.2.2 release. This list might 11486 not be complete (that is, it is possible that some PRs that have been 11487 fixed are not listed here) and some of the titles have been changed to 11488 make them more clear. 11489 11490 Internal Compiler Errors (multi-platform) 11491 11492 * [64]5919: (c++) ICE when passing variable array to template 11493 function 11494 * [65]7129: (c++) ICE with min/max assignment operators (<?= and >?=) 11495 * [66]7507: ICE with -O2 when address of called function is a 11496 complicated expression 11497 * [67]7622: ICE with nested inline functions if function's address is 11498 taken 11499 * [68]7681: (fortran) ICE in compensate_edge, in reg-stack.c (also PR 11500 [69]9258) 11501 * [70]8031: (c++) ICE in code comparing typeids and casting from 11502 virtual base 11503 * [71]8275: ICE in simplify_subreg 11504 * [72]8332: (c++) builtin strlen/template interaction causes ICE 11505 * [73]8372: (c++) ICE on explicit call of destructor 11506 * [74]8439: (c, not c++) empty struct causes ICE 11507 * [75]8442: (c++) ICE with nested template classes 11508 * [76]8518: ICE when compiling mplayer ("extern inline" issue) 11509 * [77]8615: (c++) ICE with out-of-range character constant template 11510 argument 11511 * [78]8663: (c++) ICE in cp_expr_size, at cp-lang.c:307 11512 * [79]8799: (c++) ICE: error reporting routines re-entered 11513 * [80]9328: (c++) ICE with typeof(X) for overloaded X 11514 * [81]9465: (preprocessor) cpp -traditional ICE on null bytes 11515 11516 C++ (compiler and library) bugs 11517 11518 * [82]47: scoping in nested classes is broken 11519 * [83]6745: problems with iostream rdbuf() member function 11520 * [84]8214: conversion from const char* const to char* sometimes 11521 accepted illegally 11522 * [85]8493: builtin strlen and overload resolution (same bug as 11523 [86]8332) 11524 * [87]8503: strange behaviour of function types 11525 * [88]8727: compiler confused by inheritance from an anonymous struct 11526 * [89]7445: poor performance of std::locale::classic() in 11527 multi-threaded applications 11528 * [90]8230: mishandling of overflow in vector<T>::resize 11529 * [91]8399: sync_with_stdio(false) breaks unformatted input 11530 * [92]8662: illegal access of private member of unnamed class is 11531 accepted 11532 * [93]8707: "make distclean" fails in libstdc++-v3 directory 11533 * [94]8708: __USE_MALLOC doesn't work 11534 * [95]8790: Use of non-thread-safe strtok in src/localename.cc 11535 * [96]8887: Bug in date formats with --enable-clocale=generic 11536 * [97]9076: Call Frame Instructions are not handled correctly during 11537 unwind operation 11538 * [98]9151: std::setprecision limited to 16 digits when outputting a 11539 double to a stream 11540 * [99]9168: codecvt<char, char, mbstate_t> overwrites output buffers 11541 * [100]9269: libstdc++ headers: explicit specialization of function 11542 must precede its first use 11543 * [101]9322: return value of basic_streambuf<>::getloc affected by 11544 locale::global 11545 * [102]9433: segfault in runtime support for dynamic_cast 11546 11547 C and optimizer bugs 11548 11549 * [103]8032: GCC incorrectly initializes static structs that have 11550 flexible arrays 11551 * [104]8639: simple arithmetic expression broken 11552 * [105]8794: optimization improperly eliminates certain expressions 11553 * [106]8832: traditional "asm volatile" code is illegally optimized 11554 * [107]8988: loop optimizer bug: with -O2, code is generated that 11555 segfaults (found on i386, bug present for all platforms) 11556 * [108]9492: structure copy clobbers subsequent stores to structure 11557 11558 Objective-C bugs 11559 11560 * [109]9267: Objective-C parser won't build with newer bison versions 11561 (e.g. 1.875) 11562 11563 Ada bugs 11564 11565 * [110]8344: Ada build problem due to conflict between gcc/final.o, 11566 gcc/ada/final.o 11567 11568 Preprocessor bugs 11569 11570 * [111]8524: _Pragma within macros is improperly expanded 11571 * [112]8880: __WCHAR_TYPE__ macro incorrectly set to "long int" with 11572 -fshort-wchar 11573 11574 ARM-specific 11575 11576 * [113]9090: arm ICE with >= -O2; regression from gcc-2.95 11577 11578 x86-specific (Intel/AMD) 11579 11580 * [114]8588: ICE in extract_insn, at recog.c:NNNN (shift instruction) 11581 * [115]8599: loop unroll bug with -march=k6-3 11582 * [116]9506: ABI breakage in structure return (affects BSD and 11583 Cygwin, but not GNU/Linux) 11584 11585 FreeBSD 5.0 specific 11586 11587 * [117]9484: GCC 3.2.1 Bootstrap failure on FreeBSD 5.0 11588 11589 RTEMS-specific 11590 11591 * [118]9292: hppa1.1-rtems configurery problems 11592 * [119]9293: [m68k-elf/rtems] config/m68k/t-crtstuff bug 11593 * [120]9295: [mips-rtems] config/mips/rtems.h init/fini issue 11594 * [121]9296: gthr-rtems regression 11595 * [122]9316: powerpc-rtems: extending multilibs 11596 11597 HP-PA specific 11598 11599 * [123]9493: ICE with -O2 when building a simple function 11600 11601 Documentation 11602 11603 * [124]7341: hyperlink to gcov in GCC documentation doesn't work 11604 * [125]8947: Please add a warning about "-malign-double" in docs 11605 * [126]7448, [127]8882: typo cleanups 11606 __________________________________________________________________ 11607 11608 GCC 3.2.1 11609 11610 3.2.1 adds a new warning, -Wabi. This option warns when GNU C++ 11611 generates code that is known not to be binary-compatible with the 11612 vendor-neutral ia32/ia64 ABI. Please consult the GCC manual, included 11613 in the distribution, for details. 11614 11615 This release also removes an old GCC extension, "naming types", and the 11616 documentation now directs users to use a different GCC extension, 11617 __typeof__, instead. The feature had evidently been broken for a while. 11618 11619 Otherwise, 3.2.1 is a bug fix release only; other than bug fixes and 11620 the new warning there are no new features that were not present in GCC 11621 3.2. 11622 11623 In addition, the previous fix for [128]PR 7445 (poor performance of 11624 std::locale::classic() in multi-threaded applications) was reverted 11625 ("unfixed"), because the "fix" was not thread-safe. 11626 11627 Bug Fixes 11628 11629 This section lists the problem reports (PRs) from GCC's bug tracking 11630 system that are known to be fixed in the 3.2.1 release. This list might 11631 not be complete (that is, it is possible that some PRs that have been 11632 fixed are not listed here). As you can see, the number of bug fixes is 11633 quite large, so it is strongly recommended that users of earlier GCC 11634 3.x releases upgrade to GCC 3.2.1. 11635 11636 Internal Compiler Errors (multi-platform) 11637 11638 * [129]2521: (c++) ICE in build_ptrmemfunc, in cp/typeck.c 11639 * [130]5661: (c++) ICE instantiating template on array of unknown 11640 size (bad code) 11641 * [131]6419: (c++) ICE in make_decl_rtl for "longest" attribute on 11642 64-bit platforms 11643 * [132]6994: (c++) ICE in find_function_data 11644 * [133]7150: preprocessor: GCC -dM -E gives an ICE 11645 * [134]7160: ICE when optimizing branches without a return value 11646 * [135]7228: (c++) ICE when using member template and template 11647 function 11648 * [136]7266: (c++) ICE with -pedantic on missing typename 11649 * [137]7353: ICE from use of "Naming Types" extension, see above 11650 * [138]7411: ICE in instantiate_virtual_regs_1, in function.c 11651 * [139]7478: (c++) ICE on static_cast inside template 11652 * [140]7526: preprocessor core dump when _Pragma implies #pragma 11653 dependency 11654 * [141]7721: (c++) ICE on simple (but incorrect) template ([142]7803 11655 is a duplicate) 11656 * [143]7754: (c++) ICE on union with template parameter 11657 * [144]7788: (c++) redeclaring a definition as an incomplete class 11658 causes ICE 11659 * [145]8031: (c++) ICE in comptypes, in cp/typeck.c 11660 * [146]8055: preprocessor dies with SIG11 when building FreeBSD 11661 kernel 11662 * [147]8067: (c++) ICE due to mishandling of __FUNCTION__ and related 11663 variables 11664 * [148]8134: (c++) ICE in force_store_init_value on legal code 11665 * [149]8149: (c++) ICE on incomplete type 11666 * [150]8160: (c++) ICE in build_modify_expr, in cp/typeck.c: array 11667 initialization 11668 11669 C++ (compiler and library) bugs 11670 11671 * [151]5607: No pointer adjustment in covariant return types 11672 * [152]6579: Infinite loop with statement expressions in member 11673 initialization 11674 * [153]6803: Default copy constructor bug in GCC 3.1 11675 * [154]7176: g++ confused by friend and static member with same name 11676 * [155]7188: Segfault with template class and recursive (incorrect) 11677 initializer list 11678 * [156]7306: Regression: GCC 3.x fails to compile code with virtual 11679 inheritance if a method has a variable number of arguments 11680 * [157]7461: ctype<char>::classic_table() returns offset array on 11681 Cygwin 11682 * [158]7524: f(const float arg[3]) fails 11683 * [159]7584: Erroneous ambiguous base error on using declaration 11684 * [160]7676: Member template overloading problem 11685 * [161]7679: infinite loop when a right parenthesis is missing 11686 * [162]7811: default locale not taken from environment 11687 * [163]7961: compare( char *) implemented incorrectly in 11688 basic_string<> 11689 * [164]8071: basic_ostream::operator<<(streambuf*) loops forever if 11690 streambuf::underflow() leaves gptr() NULL (dups: [165]8127, 11691 [166]6745) 11692 * [167]8096: deque::at() throws std::range_error instead of 11693 std::out_of_range 11694 * [168]8127: cout << cin.rdbuf() infinite loop 11695 * [169]8218: Excessively large memory consumed for classes with large 11696 array members 11697 * [170]8287: GCC 3.2: Destructor called for non-constructed local 11698 object 11699 * [171]8347: empty vector range used in string construction causes 11700 core dump 11701 * [172]8348: fail() flag is set in istringstream when eof() flag is 11702 set 11703 * [173]8391: regression: infinite loop in cp/decl2.c(finish_file) 11704 11705 C and optimizer bugs 11706 11707 * [174]6627: -fno-align-functions doesn't seem to disable function 11708 alignment 11709 * [175]6631: life_analysis misoptimizes code to initialize fields of 11710 a structure 11711 * [176]7102: unsigned char division results in floating exception 11712 * [177]7120: Run once loop should *always* be unrolled 11713 (pessimization) 11714 * [178]7209: Bug involving array referencing and ?: operator 11715 * [179]7515: invalid inlining of global function with -O3 11716 * [180]7814: incorrect scheduling for glibc-2.2.92 strcpy test 11717 * [181]8467: bug in sibling call optimization 11718 11719 Preprocessor bugs 11720 11721 * [182]4890: incorrect line markers from the traditional preprocessor 11722 * [183]7357: -M option omits system headers files (making it the same 11723 as -MM) 11724 * [184]7358: Changes to Sun's make Dependencies 11725 * [185]7602: C++ header files found in CPLUS_INCLUDE_PATH treated as 11726 C headers 11727 * [186]7862: Interrupting GCC -MD removes .d file but not .o 11728 * [187]8190: Failed compilation deletes -MD dependency file 11729 * [188]8524: _Pragma within macro is improperly expanded 11730 11731 x86 specific (Intel/AMD) 11732 11733 * [189]5351: (i686-only) function pass-by-value structure copy 11734 corrupts stack ([190]7591 is a duplicate) 11735 * [191]6845, [192]7034, [193]7124, [194]7174: ICE's with 11736 -march=pentium3/pentium2/athlon (these are all the same underlying 11737 bug, in MMX register use) 11738 * [195]7134, [196]7375, [197]7390: ICE with -march=athlon (maybe same 11739 as above?) 11740 * [198]6890: xmmintrin.h, _MM_TRANSPOSE4_PS is broken 11741 * [199]6981: wrong code in 64-bit manipulation on x86 11742 * [200]7242: GCC -mcpu=pentium[23] doesn't define __tune_pentiumpro__ 11743 macro 11744 * [201]7396: ix86: cmpgt_ss, cmpge_ss, cmpngt_ss, and cmpnge_ss SSE 11745 intrinsics are broken 11746 * [202]7630: GCC 3.2 breaks on Mozilla 1.0's JS sources with 11747 -march=pentium4 11748 * [203]7693: Typo in i386 mmintrin.h header 11749 * [204]7723: ICE - Pentium3 sse - GCC 3.2 11750 * [205]7951: ICE on -march=pentium4 -O2 -mfpmath=sse 11751 * [206]8146: (i686 only) gcc 3.2 miscompiles gcc 2.95.3 11752 11753 PowerPC specific 11754 11755 * [207]5967: GCC bug when profiling nested functions on powerpc 11756 * [208]6984: wrong code generated with -O2, -O3, -Os for do-while 11757 loop on PowerPC 11758 * [209]7114: PowerPC: ICE building strcoll.op from glibc-2.2.5 11759 * [210]7130: miscompiled code for GCC-3.1 on 11760 powerpc-unknown-linux-gnu with -funroll-all-loops 11761 * [211]7133: PowerPC ICE: unrecognizable insn 11762 * [212]7380: ICE in extract_insn, at recog.c:2148 11763 * [213]8252: ICE on Altivec code with optimization turned on 11764 * [214]8451: Altivec ICE in GCC 3.2 11765 11766 HP/PA specific 11767 11768 * [215]7250: __ashrdi3 returns wrong value on 32 bit hppa 11769 11770 SPARC specific 11771 11772 * [216]6668: when using --disable-multilib, libgcc_s.so is installed 11773 in the wrong place on sparc-solaris 11774 * [217]7151: ICE when compiling for UltraSPARC 11775 * [218]7335: SPARC: ICE in verify_wide_reg (flow.c:557) with long 11776 double and -O1 11777 * [219]7842: [REGRESSION] SPARC code gen bug 11778 11779 ARM specific 11780 11781 * [220]7856: [arm] invalid offset in constant pool reference 11782 * [221]7967: optimization produces wrong code (ARM) 11783 11784 Alpha specific 11785 11786 * [222]7374: __builtin_fabsl broken on alpha 11787 11788 IBM s390 specific 11789 11790 * [223]7370: ICE in fixup_var_refs_1 on s390x 11791 * [224]7409: loop optimization bug on s390x-linux-gnu 11792 * [225]8232: s390x: ICE when using bcmp with int length argument 11793 11794 SCO specific 11795 11796 * [226]7623: SCO OpenServer build fails with machmode.def: undefined 11797 symbol: BITS_PER_UNIT 11798 11799 m68k/Coldfire specific 11800 11801 * [227]8314: crtbegin, crtend need to be multilib'ed for this 11802 platform 11803 11804 Documentation 11805 11806 * [228]761: Document some undocumented options 11807 * [229]5610: Fix documentation about invoking SSE instructions 11808 (-mfpmath=sse) 11809 * [230]7484: List -Wmissing-declarations as C-only option 11810 * [231]7531: -mcmodel not documented for x86-64 11811 * [232]8120: Update documentation of bad use of ## 11812 __________________________________________________________________ 11813 11814 GCC 3.2 11815 11816 3.2 is a small bug fix release, but there is a change to the 11817 application binary interface (ABI), hence the change to the second part 11818 of the version number. 11819 11820 The main purpose of the 3.2 release is to correct a couple of problems 11821 in the C++ ABI, with the intention of providing a stable interface 11822 going forward. Accordingly, 3.2 is only a small change to 3.1.1. 11823 11824 Bug Fixes 11825 11826 C++ 11827 11828 * [233]7320: g++ 3.2 relocation problem 11829 * [234]7470: vtable: virtual function pointers not in declaration 11830 order 11831 11832 libstdc++ 11833 11834 * [235]6410: Trouble with non-ASCII monetary symbols and wchar_t 11835 * [236]6503, [237]6642, [238]7186: Problems with comparing or 11836 subtracting various types of const and non-const iterators 11837 * [239]7216: ambiguity with basic_iostream::traits_type 11838 * [240]7220: problem with basic_istream::ignore(0,delimiter) 11839 * [241]7222: locale::operator==() doesn't work on std::locale("") 11840 * [242]7286: placement operator delete issue 11841 * [243]7442: cxxabi.h does not match the C++ ABI 11842 * [244]7445: poor performance of std::locale::classic() in 11843 multi-threaded applications 11844 11845 x86-64 specific 11846 11847 * [245]7291: off-by-one in generated inline bzero code for x86-64 11848 11849 11850 For questions related to the use of GCC, please consult these web 11851 pages and the [246]GCC manuals. If that fails, the 11852 [247]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 11853 web pages and the development of GCC are welcome on our developer 11854 list at [248]gcc (a] gcc.gnu.org. All of [249]our lists have public 11855 archives. 11856 11857 Copyright (C) [250]Free Software Foundation, Inc. Verbatim copying and 11858 distribution of this entire article is permitted in any medium, 11859 provided this notice is preserved. 11860 11861 These pages are [251]maintained by the GCC team. Last modified 11862 2012-11-02[252]. 11863 11864 References 11865 11866 1. http://gcc.gnu.org/gcc-3.2/changes.html#3.2.3 11867 2. http://gcc.gnu.org/gcc-3.1/changes.html 11868 3. http://gcc.gnu.org/gcc-3.2/c++-abi.html 11869 4. http://gcc.gnu.org/PR3782 11870 5. http://gcc.gnu.org/PR6440 11871 6. http://gcc.gnu.org/PR7050 11872 7. http://gcc.gnu.org/PR7741 11873 8. http://gcc.gnu.org/PR7982 11874 9. http://gcc.gnu.org/PR8068 11875 10. http://gcc.gnu.org/PR8178 11876 11. http://gcc.gnu.org/PR8396 11877 12. http://gcc.gnu.org/PR8674 11878 13. http://gcc.gnu.org/PR9768 11879 14. http://gcc.gnu.org/PR9798 11880 15. http://gcc.gnu.org/PR9799 11881 16. http://gcc.gnu.org/PR9928 11882 17. http://gcc.gnu.org/PR10114 11883 18. http://gcc.gnu.org/PR10352 11884 19. http://gcc.gnu.org/PR10336 11885 20. http://gcc.gnu.org/PR8224 11886 21. http://gcc.gnu.org/PR8613 11887 22. http://gcc.gnu.org/PR8828 11888 23. http://gcc.gnu.org/PR9226 11889 24. http://gcc.gnu.org/PR9853 11890 25. 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11945 80. http://gcc.gnu.org/PR9328 11946 81. http://gcc.gnu.org/PR9465 11947 82. http://gcc.gnu.org/PR47 11948 83. http://gcc.gnu.org/PR6745 11949 84. http://gcc.gnu.org/PR8214 11950 85. http://gcc.gnu.org/PR8493 11951 86. http://gcc.gnu.org/PR8332 11952 87. http://gcc.gnu.org/PR8503 11953 88. http://gcc.gnu.org/PR8727 11954 89. http://gcc.gnu.org/PR7445 11955 90. http://gcc.gnu.org/PR8230 11956 91. http://gcc.gnu.org/PR8399 11957 92. http://gcc.gnu.org/PR8662 11958 93. http://gcc.gnu.org/PR8707 11959 94. http://gcc.gnu.org/PR8708 11960 95. http://gcc.gnu.org/PR8790 11961 96. http://gcc.gnu.org/PR8887 11962 97. http://gcc.gnu.org/PR9076 11963 98. http://gcc.gnu.org/PR9151 11964 99. http://gcc.gnu.org/PR9168 11965 100. http://gcc.gnu.org/PR9269 11966 101. http://gcc.gnu.org/PR9322 11967 102. http://gcc.gnu.org/PR9433 11968 103. http://gcc.gnu.org/PR8032 11969 104. http://gcc.gnu.org/PR8639 11970 105. http://gcc.gnu.org/PR8794 11971 106. http://gcc.gnu.org/PR8832 11972 107. 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http://gcc.gnu.org/PR7160 12000 135. http://gcc.gnu.org/PR7228 12001 136. http://gcc.gnu.org/PR7266 12002 137. http://gcc.gnu.org/PR7353 12003 138. http://gcc.gnu.org/PR7411 12004 139. http://gcc.gnu.org/PR7478 12005 140. http://gcc.gnu.org/PR7526 12006 141. http://gcc.gnu.org/PR7721 12007 142. http://gcc.gnu.org/PR7803 12008 143. http://gcc.gnu.org/PR7754 12009 144. http://gcc.gnu.org/PR7788 12010 145. http://gcc.gnu.org/PR8031 12011 146. http://gcc.gnu.org/PR8055 12012 147. http://gcc.gnu.org/PR8067 12013 148. http://gcc.gnu.org/PR8134 12014 149. http://gcc.gnu.org/PR8149 12015 150. http://gcc.gnu.org/PR8160 12016 151. http://gcc.gnu.org/PR5607 12017 152. http://gcc.gnu.org/PR6579 12018 153. http://gcc.gnu.org/PR6803 12019 154. http://gcc.gnu.org/PR7176 12020 155. http://gcc.gnu.org/PR7188 12021 156. http://gcc.gnu.org/PR7306 12022 157. http://gcc.gnu.org/PR7461 12023 158. http://gcc.gnu.org/PR7524 12024 159. http://gcc.gnu.org/PR7584 12025 160. http://gcc.gnu.org/PR7676 12026 161. 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http://gcc.gnu.org/PR8524 12054 189. http://gcc.gnu.org/PR5351 12055 190. http://gcc.gnu.org/PR7591 12056 191. http://gcc.gnu.org/PR6845 12057 192. http://gcc.gnu.org/PR7034 12058 193. http://gcc.gnu.org/PR7124 12059 194. http://gcc.gnu.org/PR7174 12060 195. http://gcc.gnu.org/PR7134 12061 196. http://gcc.gnu.org/PR7375 12062 197. http://gcc.gnu.org/PR7390 12063 198. http://gcc.gnu.org/PR6890 12064 199. http://gcc.gnu.org/PR6981 12065 200. http://gcc.gnu.org/PR7242 12066 201. http://gcc.gnu.org/PR7396 12067 202. http://gcc.gnu.org/PR7630 12068 203. http://gcc.gnu.org/PR7693 12069 204. http://gcc.gnu.org/PR7723 12070 205. http://gcc.gnu.org/PR7951 12071 206. http://gcc.gnu.org/PR8146 12072 207. http://gcc.gnu.org/PR5967 12073 208. http://gcc.gnu.org/PR6984 12074 209. http://gcc.gnu.org/PR7114 12075 210. http://gcc.gnu.org/PR7130 12076 211. http://gcc.gnu.org/PR7133 12077 212. http://gcc.gnu.org/PR7380 12078 213. http://gcc.gnu.org/PR8252 12079 214. http://gcc.gnu.org/PR8451 12080 215. http://gcc.gnu.org/PR7250 12081 216. http://gcc.gnu.org/PR6668 12082 217. http://gcc.gnu.org/PR7151 12083 218. http://gcc.gnu.org/PR7335 12084 219. http://gcc.gnu.org/PR7842 12085 220. http://gcc.gnu.org/PR7856 12086 221. http://gcc.gnu.org/PR7967 12087 222. http://gcc.gnu.org/PR7374 12088 223. http://gcc.gnu.org/PR7370 12089 224. http://gcc.gnu.org/PR7409 12090 225. http://gcc.gnu.org/PR8232 12091 226. http://gcc.gnu.org/PR7623 12092 227. http://gcc.gnu.org/PR8314 12093 228. http://gcc.gnu.org/PR761 12094 229. http://gcc.gnu.org/PR5610 12095 230. http://gcc.gnu.org/PR7484 12096 231. http://gcc.gnu.org/PR7531 12097 232. http://gcc.gnu.org/PR8120 12098 233. http://gcc.gnu.org/PR7320 12099 234. http://gcc.gnu.org/PR7470 12100 235. http://gcc.gnu.org/PR6410 12101 236. http://gcc.gnu.org/PR6503 12102 237. http://gcc.gnu.org/PR6642 12103 238. http://gcc.gnu.org/PR7186 12104 239. http://gcc.gnu.org/PR7216 12105 240. http://gcc.gnu.org/PR7220 12106 241. http://gcc.gnu.org/PR7222 12107 242. http://gcc.gnu.org/PR7286 12108 243. http://gcc.gnu.org/PR7442 12109 244. http://gcc.gnu.org/PR7445 12110 245. http://gcc.gnu.org/PR7291 12111 246. http://gcc.gnu.org/onlinedocs/ 12112 247. mailto:gcc-help (a] gcc.gnu.org 12113 248. mailto:gcc (a] gcc.gnu.org 12114 249. http://gcc.gnu.org/lists.html 12115 250. http://www.fsf.org/ 12116 251. http://gcc.gnu.org/about.html 12117 252. http://validator.w3.org/check/referer 12118 ====================================================================== 12119 http://gcc.gnu.org/gcc-3.1/index.html 12120 12121 GCC 3.1 12122 12123 July 27, 2002 12124 12125 The [1]GNU project and the GCC developers are pleased to announce the 12126 release of GCC 3.1.1. 12127 12128 The links below still apply to GCC 3.1.1. 12129 12130 May 15, 2002 12131 12132 The [2]GNU project and the GCC developers are pleased to announce the 12133 release of GCC 3.1. 12134 12135 GCC used to stand for the GNU C Compiler, but since the compiler 12136 supports several other languages aside from C, it now stands for the 12137 GNU Compiler Collection. 12138 12139 A list of [3]successful builds is updated as new information becomes 12140 available. 12141 12142 The GCC developers would like to thank the numerous people that have 12143 contributed [4]new features, improvements, bug fixes, and other changes 12144 as well as test results to GCC. This [5]amazing group of volunteers is 12145 what makes GCC successful. 12146 12147 For additional information about GCC please refer to the [6]GCC project 12148 web site or contact the [7]GCC development mailing list. 12149 12150 To obtain GCC please use [8]our mirror sites, or our CVS server. 12151 __________________________________________________________________ 12152 12153 12154 For questions related to the use of GCC, please consult these web 12155 pages and the [9]GCC manuals. If that fails, the 12156 [10]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12157 web pages and the development of GCC are welcome on our developer 12158 list at [11]gcc (a] gcc.gnu.org. All of [12]our lists have public 12159 archives. 12160 12161 Copyright (C) [13]Free Software Foundation, Inc. Verbatim copying and 12162 distribution of this entire article is permitted in any medium, 12163 provided this notice is preserved. 12164 12165 These pages are [14]maintained by the GCC team. Last modified 12166 2012-11-02[15]. 12167 12168 References 12169 12170 1. http://www.gnu.org/ 12171 2. http://www.gnu.org/ 12172 3. http://gcc.gnu.org/gcc-3.1/buildstat.html 12173 4. http://gcc.gnu.org/gcc-3.1/changes.html 12174 5. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12175 6. http://gcc.gnu.org/index.html 12176 7. mailto:gcc (a] gcc.gnu.org 12177 8. http://gcc.gnu.org/mirrors.html 12178 9. http://gcc.gnu.org/onlinedocs/ 12179 10. mailto:gcc-help (a] gcc.gnu.org 12180 11. mailto:gcc (a] gcc.gnu.org 12181 12. http://gcc.gnu.org/lists.html 12182 13. http://www.fsf.org/ 12183 14. http://gcc.gnu.org/about.html 12184 15. http://validator.w3.org/check/referer 12185 ====================================================================== 12186 http://gcc.gnu.org/gcc-3.1/changes.html 12187 12188 GCC 3.1 Release Series 12189 Changes, New Features, and Fixes 12190 12191 Additional changes in GCC 3.1.1 12192 12193 * A bug related to how structures and unions are returned has been 12194 fixed for powerpc-*-netbsd*. 12195 * An important bug in the implementation of -fprefetch-loop-arrays 12196 has been fixed. Previously the optimization prefetched random 12197 blocks of memory for most targets except for i386. 12198 * The Java compiler now compiles Java programs much faster and also 12199 works with parallel make. 12200 * Nested functions have been fixed for mips*-*-netbsd*. 12201 * Some missing floating point support routines have beed added for 12202 mips*-*-netbsd*. 12203 * This [1]message gives additional information about the bugs fixed 12204 in this release. 12205 12206 Caveats 12207 12208 * The -traditional C compiler option has been deprecated and will be 12209 removed in GCC 3.3. (It remains possible to preprocess non-C code 12210 with the traditional preprocessor.) 12211 * The default debugging format for most ELF platforms (including 12212 GNU/Linux and FreeBSD; notable exception is Solaris) has changed 12213 from stabs to DWARF2. This requires GDB 5.1.1 or later. 12214 12215 General Optimizer Improvements 12216 12217 * Jan Hubicka, SuSE Labs, together with Richard Henderson, Red Hat, 12218 and Andreas Jaeger, SuSE Labs, has contributed [2]infrastructure 12219 for profile driven optimizations. 12220 Options -fprofile-arcs and -fbranch-probabilities can now be used 12221 to improve speed of the generated code by profiling the actual 12222 program behaviour on typical runs. In the absence of profile info 12223 the compiler attempts to guess the profile statically. 12224 * [3]SPEC2000 and SPEC95 benchmark suites are now used daily to 12225 monitor performance of the generated code. 12226 According to the SPECInt2000 results on an AMD Athlon CPU, the code 12227 generated by GCC 3.1 is 6% faster on the average (8.2% faster with 12228 profile feedback) compared to GCC 3.0. The code produced by GCC 3.0 12229 is about 2.1% faster compared to 2.95.3. Tests were done using the 12230 -O2 -march=athlon command-line options. 12231 * Alexandre Oliva, of Red Hat, has generalized the tree inlining 12232 infrastructure developed by CodeSourcery, LLC for the C++ front 12233 end, so that it is now used in the C front end too. Inlining 12234 functions as trees exposes them earlier to the compiler, giving it 12235 more opportunities for optimization. 12236 * Support for data prefetching instructions has been added to the GCC 12237 back end and several targets. A new __builtin_prefetch intrinsic is 12238 available to explicitly insert prefetch instructions and 12239 experimental support for loop array prefetching has been added (see 12240 -fprefetch-loop-array documentation). 12241 * Support for emitting debugging information for macros has been 12242 added for DWARF2. It is activated using -g3. 12243 12244 New Languages and Language specific improvements 12245 12246 C/C++ 12247 12248 * A few more [4]ISO C99 features. 12249 * The preprocessor is 10-50% faster than the preprocessor in GCC 3.0. 12250 * The preprocessor's symbol table has been merged with the symbol 12251 table of the C, C++ and Objective-C front ends. 12252 * The preprocessor consumes less memory than the preprocessor in GCC 12253 3.0, often significantly so. On normal input files, it typically 12254 consumes less memory than pre-3.0 cccp-based GCC, too. 12255 12256 C++ 12257 12258 * -fhonor-std and -fno-honor-std have been removed. -fno-honor-std 12259 was a workaround to allow std compliant code to work with the 12260 non-std compliant libstdc++-v2. libstdc++-v3 is std compliant. 12261 * The C++ ABI has been fixed so that void (A::*)() const is mangled 12262 as "M1AKFvvE", rather than "MK1AFvvE" as before. This change only 12263 affects pointer to cv-qualified member function types. 12264 * The C++ ABI has been changed to correctly handle this code: 12265 struct A { 12266 void operator delete[] (void *, size_t); 12267 }; 12268 12269 struct B : public A { 12270 }; 12271 12272 new B[10]; 12273 12274 The amount of storage allocated for the array will be greater than 12275 it was in 3.0, in order to store the number of elements in the 12276 array, so that the correct size can be passed to operator delete[] 12277 when the array is deleted. Previously, the value passed to operator 12278 delete[] was unpredictable. 12279 This change will only affect code that declares a two-argument 12280 operator delete[] with a second parameter of type size_t in a base 12281 class, and does not override that definition in a derived class. 12282 * The C++ ABI has been changed so that: 12283 struct A { 12284 void operator delete[] (void *, size_t); 12285 void operator delete[] (void *); 12286 }; 12287 12288 does not cause unnecessary storage to be allocated when an array of 12289 A objects is allocated. 12290 This change will only affect code that declares both of these forms 12291 of operator delete[], and declared the two-argument form before the 12292 one-argument form. 12293 * The C++ ABI has been changed so that when a parameter is passed by 12294 value, any cleanup for that parameter is performed in the caller, 12295 as specified by the ia64 C++ ABI, rather than the called function 12296 as before. As a result, classes with a non-trivial destructor but a 12297 trivial copy constructor will be passed and returned by invisible 12298 reference, rather than by bitwise copy as before. 12299 * G++ now supports the "named return value optimization": for code 12300 like 12301 A f () { 12302 A a; 12303 ... 12304 return a; 12305 } 12306 12307 G++ will allocate a in the return value slot, so that the return 12308 becomes a no-op. For this to work, all return statements in the 12309 function must return the same variable. 12310 * Improvements to the C++ library are listed in [5]the libstdc++-v3 12311 FAQ. 12312 12313 Objective-C 12314 12315 * Annoying linker warnings (due to incorrect code being generated) 12316 have been fixed. 12317 * If a class method cannot be found, the compiler no longer issues a 12318 warning if a corresponding instance method exists in the root 12319 class. 12320 * Forward @protocol declarations have been fixed. 12321 * Loading of categories has been fixed in certain situations (GNU run 12322 time only). 12323 * The class lookup in the run-time library has been rewritten so that 12324 class method dispatch is more than twice as fast as it used to be 12325 (GNU run time only). 12326 12327 Java 12328 12329 * libgcj now includes RMI, java.lang.ref.*, javax.naming, and 12330 javax.transaction. 12331 * Property files and other system resources can be compiled into 12332 executables which use libgcj using the new gcj --resource feature. 12333 * libgcj has been ported to more platforms. In particular there is 12334 now a mostly-functional mingw32 (Windows) target port. 12335 * JNI and CNI invocation interfaces were implemented, so gcj-compiled 12336 Java code can now be called from a C/C++ application. 12337 * gcj can now use builtin functions for certain known methods, for 12338 instance Math.cos. 12339 * gcj can now automatically remove redundant array-store checks in 12340 some common cases. 12341 * The --no-store-checks optimization option was added. This can be 12342 used to omit runtime store checks for code which is known not to 12343 throw ArrayStoreException 12344 * The following third party interface standards were added to libgcj: 12345 org.w3c.dom and org.xml.sax. 12346 * java.security has been merged with GNU Classpath. The new package 12347 is now JDK 1.2 compliant, and much more complete. 12348 * A bytecode verifier was added to the libgcj interpreter. 12349 * java.lang.Character was rewritten to comply with the Unicode 3.0 12350 standard, and improve performance. 12351 * Partial support for many more locales was added to libgcj. 12352 * Socket timeouts have been implemented. 12353 * libgcj has been merged into a single shared library. There are no 12354 longer separate shared libraries for the garbage collector and 12355 zlib. 12356 * Several performance improvements were made to gcj and libgcj: 12357 + Hash synchronization (thin locks) 12358 + A special allocation path for finalizer-free objects 12359 + Thread-local allocation 12360 + Parallel GC, and other GC tweaks 12361 12362 Fortran 12363 12364 Fortran improvements are listed in [6]the Fortran documentation. 12365 12366 Ada 12367 12368 [7]Ada Core Technologies, Inc, has contributed its GNAT Ada 95 front 12369 end and associated tools. The GNAT compiler fully implements the Ada 12370 language as defined by the ISO/IEC 8652 standard. 12371 12372 Please note that the integration of the Ada front end is still work in 12373 progress. 12374 12375 New Targets and Target Specific Improvements 12376 12377 * Hans-Peter Nilsson has contributed a port to [8]MMIX, the CPU 12378 architecture used in new editions of Donald E. Knuth's The Art of 12379 Computer Programming. 12380 * [9]Axis Communications has contributed its port to the CRIS CPU 12381 architecture, used in the ETRAX system-on-a-chip series. See 12382 [10]Axis' developer site for technical information. 12383 * Alexandre Oliva, of Red Hat, has contributed a port to the 12384 [11]SuperH SH5 64-bit RISC microprocessor architecture, extending 12385 the existing SH port. 12386 * UltraSPARC is fully supported in 64-bit mode. The option -m64 12387 enables it. 12388 * For compatibility with the Sun compiler #pragma redefine_extname 12389 has been implemented on Solaris. 12390 * The x86 back end has had some noticeable work done to it. 12391 + SuSE Labs developers Jan Hubicka, Bo Thorsen and Andreas 12392 Jaeger have contributed a port to the AMD x86-64 architecture. 12393 For more information on x86-64 see [12]http://www.x86-64.org. 12394 + The compiler now supports MMX, 3DNow!, SSE, and SSE2 12395 instructions. Options -mmmx, -m3dnow, -msse, and -msse2 will 12396 enable the respective instruction sets. Intel C++ compatible 12397 MMX/3DNow!/SSE intrinsics are implemented. SSE2 intrinsics 12398 will be added in next major release. 12399 + Following those improvements, targets for Pentium MMX, K6-2, 12400 K6-3, Pentium III, Pentium 4, and Athlon 4 Mobile/XP/MP were 12401 added. Refer to the documentation on -march= and -mcpu= 12402 options for details. 12403 + For those targets that support it, -mfpmath=sse will cause the 12404 compiler to generate SSE/SSE2 instructions for floating point 12405 math instead of x87 instructions. Usually, this will lead to 12406 quicker code -- especially on the Pentium 4. Note that only 12407 scalar floating point instructions are used and GCC does not 12408 exploit SIMD features yet. 12409 + Prefetch support has been added to the Pentium III, Pentium 4, 12410 K6-2, K6-3, and Athlon series. 12411 + Code generated for floating point to integer conversions has 12412 been improved leading to better performance of many 3D 12413 applications. 12414 * The PowerPC back end has added 64-bit PowerPC GNU/Linux support. 12415 * C++ support for AIX has been improved. 12416 * Aldy Hernandez, of Red Hat, Inc, has contributed extensions to the 12417 PowerPC port supporting the AltiVec programming model (SIMD). The 12418 support, though presently useful, is experimental and is expected 12419 to stabilize for 3.2. The support is written to conform to 12420 Motorola's AltiVec specs. See -maltivec. 12421 12422 Obsolete Systems 12423 12424 Support for a number of older systems has been declared obsolete in GCC 12425 3.1. Unless there is activity to revive them, the next release of GCC 12426 will have their sources permanently removed. 12427 12428 All configurations of the following processor architectures have been 12429 declared obsolete: 12430 * MIL-STD-1750A, 1750a-*-* 12431 * AMD A29k, a29k-*-* 12432 * Convex, c*-convex-* 12433 * Clipper, clipper-*-* 12434 * Elxsi, elxsi-*-* 12435 * Intel i860, i860-*-* 12436 * Sun picoJava, pj-*-* and pjl-*-* 12437 * Western Electric 32000, we32k-*-* 12438 12439 Most configurations of the following processor architectures have been 12440 declared obsolete, but we are preserving a few systems which may have 12441 active developers. It is unlikely that the remaining systems will 12442 survive much longer unless we see definite signs of port activity. 12443 * Motorola 88000 except 12444 + Generic a.out, m88k-*-aout* 12445 + Generic SVR4, m88k-*-sysv4 12446 + OpenBSD, m88k-*-openbsd* 12447 * NS32k except 12448 + NetBSD, ns32k-*-netbsd* 12449 + OpenBSD, ns32k-*-openbsd*. 12450 * ROMP except 12451 + OpenBSD, romp-*-openbsd*. 12452 12453 Finally, only some configurations of these processor architectures are 12454 being obsoleted. 12455 * Alpha: 12456 + OSF/1, alpha*-*-osf[123]*. (Digital Unix and Tru64 Unix, aka 12457 alpha*-*-osf[45], are still supported.) 12458 * ARM: 12459 + RISCiX, arm-*-riscix*. 12460 * i386: 12461 + 386BSD, i?86-*-bsd* 12462 + Chorus, i?86-*-chorusos* 12463 + DG/UX, i?86-*-dgux* 12464 + FreeBSD 1.x, i?86-*-freebsd1.* 12465 + IBM AIX, i?86-*-aix* 12466 + ISC UNIX, i?86-*-isc* 12467 + GNU/Linux with pre-BFD linker, i?86-*-linux*oldld* 12468 + NEXTstep, i?86-next-* 12469 + OSF UNIX, i?86-*-osf1* and i?86-*-osfrose* 12470 + RTEMS/coff, i?86-*-rtemscoff* 12471 + RTEMS/go32, i?86-go32-rtems* 12472 + Sequent/BSD, i?86-sequent-bsd* 12473 + Sequent/ptx before version 3, i?86-sequent-ptx[12]* and 12474 i?86-sequent-sysv3* 12475 + SunOS, i?86-*-sunos* 12476 * Motorola 68000: 12477 + Altos, m68[k0]*-altos-* 12478 + Apollo, m68[k0]*-apollo-* 12479 + Apple A/UX, m68[k0]*-apple-* 12480 + Bull, m68[k0]*-bull-* 12481 + Convergent, m68[k0]*-convergent-* 12482 + Generic SVR3, m68[k0]*-*-sysv3* 12483 + ISI, m68[k0]*-isi-* 12484 + LynxOS, m68[k0]*-*-lynxos* 12485 + NEXT, m68[k0]*-next-* 12486 + RTEMS/coff, m68[k0]*-*-rtemscoff* 12487 + Sony, m68[k0]*-sony-* 12488 * MIPS: 12489 + DEC Ultrix, mips-*-ultrix* and mips-dec-* 12490 + Generic BSD, mips-*-bsd* 12491 + Generic System V, mips-*-sysv* 12492 + IRIX before version 5, mips-sgi-irix[1234]* 12493 + RiscOS, mips-*-riscos* 12494 + Sony, mips-sony-* 12495 + Tandem, mips-tandem-* 12496 * SPARC: 12497 + RTEMS/a.out, sparc-*-rtemsaout*. 12498 12499 Documentation improvements 12500 12501 * The old manual ("Using and Porting the GNU Compiler Collection") 12502 has been replaced by a users manual ("Using the GNU Compiler 12503 Collection") and a separate internals reference manual ("GNU 12504 Compiler Collection Internals"). 12505 * More complete and much improved documentation about GCC's internal 12506 representation used by the C and C++ front ends. 12507 * Many cleanups and improvements in general. 12508 12509 12510 For questions related to the use of GCC, please consult these web 12511 pages and the [13]GCC manuals. If that fails, the 12512 [14]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12513 web pages and the development of GCC are welcome on our developer 12514 list at [15]gcc (a] gcc.gnu.org. All of [16]our lists have public 12515 archives. 12516 12517 Copyright (C) [17]Free Software Foundation, Inc. Verbatim copying and 12518 distribution of this entire article is permitted in any medium, 12519 provided this notice is preserved. 12520 12521 These pages are [18]maintained by the GCC team. Last modified 12522 2013-10-31[19]. 12523 12524 References 12525 12526 1. http://gcc.gnu.org/ml/gcc/2002-07/msg01208.html 12527 2. http://gcc.gnu.org/news/profiledriven.html 12528 3. http://gcc.gnu.org/benchmarks/ 12529 4. http://gcc.gnu.org/c99status.html 12530 5. http://gcc.gnu.org/onlinedocs/libstdc++/faq.html 12531 6. http://gcc.gnu.org/onlinedocs/gcc-3.1.1/g77/News.html 12532 7. http://www.adacore.com/ 12533 8. http://www-cs-faculty.stanford.edu/~knuth/mmix.html 12534 9. http://www.axis.com/ 12535 10. http://developer.axis.com/ 12536 11. http://www.superh.com/ 12537 12. http://www.x86-64.org/ 12538 13. http://gcc.gnu.org/onlinedocs/ 12539 14. mailto:gcc-help (a] gcc.gnu.org 12540 15. mailto:gcc (a] gcc.gnu.org 12541 16. http://gcc.gnu.org/lists.html 12542 17. http://www.fsf.org/ 12543 18. http://gcc.gnu.org/about.html 12544 19. http://validator.w3.org/check/referer 12545 ====================================================================== 12546 http://gcc.gnu.org/gcc-3.0/gcc-3.0.html 12547 12548 GCC 3.0.4 12549 12550 February 20, 2002 12551 12552 The [1]GNU project and the GCC developers are pleased to announce the 12553 release of GCC 3.0.4, which is a bug-fix release for the GCC 3.0 12554 series. 12555 12556 GCC used to stand for the GNU C Compiler, but since the compiler 12557 supports several other languages aside from C, it now stands for the 12558 GNU Compiler Collection. 12559 12560 GCC 3.0.x has several new optimizations, new targets, new languages and 12561 many other new features, relative to GCC 2.95.x. See the [2]new 12562 features page for a more complete list. 12563 12564 A list of [3]successful builds is updated as new information becomes 12565 available. 12566 12567 The GCC developers would like to thank the numerous people that have 12568 contributed new features, test results, bug fixes, etc to GCC. This 12569 [4]amazing group of volunteers is what makes GCC successful. 12570 12571 And finally, we can't in good conscience fail to mention some 12572 [5]caveats to using GCC 3.0.x. 12573 12574 For additional information about GCC please refer to the [6]GCC project 12575 web site or contact the [7]GCC development mailing list. 12576 12577 To obtain GCC please use [8]our mirror sites, or our CVS server. 12578 __________________________________________________________________ 12579 12580 Previous 3.0.x Releases 12581 12582 December 20, 2001: GCC 3.0.3 has been released. 12583 October 25, 2001: GCC 3.0.2 has been released. 12584 August 20, 2001: GCC 3.0.1 has been released. 12585 June 18, 2001: GCC 3.0 has been released. 12586 12587 12588 For questions related to the use of GCC, please consult these web 12589 pages and the [9]GCC manuals. If that fails, the 12590 [10]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12591 web pages and the development of GCC are welcome on our developer 12592 list at [11]gcc (a] gcc.gnu.org. All of [12]our lists have public 12593 archives. 12594 12595 Copyright (C) [13]Free Software Foundation, Inc. Verbatim copying and 12596 distribution of this entire article is permitted in any medium, 12597 provided this notice is preserved. 12598 12599 These pages are [14]maintained by the GCC team. Last modified 12600 2012-11-02[15]. 12601 12602 References 12603 12604 1. http://www.gnu.org/ 12605 2. http://gcc.gnu.org/gcc-3.0/features.html 12606 3. http://gcc.gnu.org/gcc-3.0/buildstat.html 12607 4. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12608 5. http://gcc.gnu.org/gcc-3.0/caveats.html 12609 6. http://gcc.gnu.org/index.html 12610 7. mailto:gcc (a] gcc.gnu.org 12611 8. http://gcc.gnu.org/mirrors.html 12612 9. http://gcc.gnu.org/onlinedocs/ 12613 10. mailto:gcc-help (a] gcc.gnu.org 12614 11. mailto:gcc (a] gcc.gnu.org 12615 12. http://gcc.gnu.org/lists.html 12616 13. http://www.fsf.org/ 12617 14. http://gcc.gnu.org/about.html 12618 15. http://validator.w3.org/check/referer 12619 ====================================================================== 12620 http://gcc.gnu.org/gcc-3.0/features.html 12621 12622 GCC 3.0 New Features 12623 12624 Additional changes in GCC 3.0.4 12625 12626 * GCC 3.0 now supports newer versions of the [1]NetBSD operating 12627 system, which use the ELF object file format, on x86 processors. 12628 * Correct debugging information is generated from functions that have 12629 lines from multiple files (e.g. yacc output). 12630 * A fix for whitespace handling in the -traditional preprocessor, 12631 which can affect Fortran. 12632 * Fixes to the exception handling runtime. 12633 * More fixes for bad code generation in C++. 12634 * A fix for shared library generation under AIX 4.3. 12635 * Documentation updates. 12636 * Port of GCC to Tensilica's Xtensa processor contributed. 12637 * A fix for compiling the PPC Linux kernel (FAT fs wouldn't link). 12638 12639 Additional changes in GCC 3.0.3 12640 12641 * A fix to correct an accidental change to the PowerPC ABI. 12642 * Fixes for bad code generation on a variety of architectures. 12643 * Improvements to the debugging information generated for C++ 12644 classes. 12645 * Fixes for bad code generation in C++. 12646 * A fix to avoid crashes in the C++ demangler. 12647 * A fix to the C++ standard library to avoid buffer overflows. 12648 * Miscellaneous improvements for a variety of architectures. 12649 12650 Additional changes in GCC 3.0.2 12651 12652 * Fixes for bad code generation during loop unrolling. 12653 * Fixes for bad code generation by the sibling call optimization. 12654 * Minor improvements to x86 code generation. 12655 * Implementation of function descriptors in C++ vtables for IA64. 12656 * Numerous minor bug-fixes. 12657 12658 Additional changes in GCC 3.0.1 12659 12660 * C++ fixes for incorrect code-generation. 12661 * Improved cross-compiling support for the C++ standard library. 12662 * Fixes for some embedded targets that worked in GCC 2.95.3, but not 12663 in GCC 3.0. 12664 * Fixes for various exception-handling bugs. 12665 * A port to the S/390 architecture. 12666 12667 General Optimizer Improvements 12668 12669 * [2]Basic block reordering pass. 12670 * New if-conversion pass with support for conditional (predicated) 12671 execution. 12672 * New tail call and sibling call elimination optimizations. 12673 * New register renaming pass. 12674 * New (experimental) [3]static single assignment (SSA) representation 12675 support. 12676 * New dead-code elimination pass implemented using the SSA 12677 representation. 12678 * [4]Global null pointer test elimination. 12679 * [5]Global code hoisting/unification. 12680 * More builtins and optimizations for stdio.h, string.h and old BSD 12681 functions, as well as for ISO C99 functions. 12682 * New builtin __builtin_expect for giving hints to the branch 12683 predictor. 12684 12685 New Languages and Language specific improvements 12686 12687 * The GNU Compiler for the Java(TM) language (GCJ) is now integrated 12688 and supported, including the run-time library containing most 12689 common non-GUI Java classes, a bytecode interpreter, and the Boehm 12690 conservative garbage collector. Many bugs have been fixed. GCJ can 12691 compile Java source or Java bytecodes to either native code or Java 12692 class files, and supports native methods written in either the 12693 standard JNI or the more efficient and convenient CNI. 12694 * Here is a [6]partial list of C++ improvements, both new features 12695 and those no longer supported. 12696 * New C++ ABI. On the IA-64 platform GCC is capable of 12697 inter-operating with other IA-64 compilers. 12698 * The new ABI also significantly reduces the size of symbol and debug 12699 information. 12700 * New [7]C++ support library and many C++ bug fixes, vastly improving 12701 our conformance to the ISO C++ standard. 12702 * New [8]inliner for C++. 12703 * Rewritten C preprocessor, integrated into the C, C++ and Objective 12704 C compilers, with very many improvements including ISO C99 support 12705 and [9]improvements to dependency generation. 12706 * Support for more [10]ISO C99 features. 12707 * Many improvements to support for checking calls to format functions 12708 such as printf and scanf, including support for ISO C99 format 12709 features, extensions from the Single Unix Specification and GNU 12710 libc 2.2, checking of strfmon formats and features to assist in 12711 auditing for format string security bugs. 12712 * New warnings for C code that may have undefined semantics because 12713 of violations of sequence point rules in the C standard (such as a 12714 = a++;, a[n] = b[n++]; and a[i++] = i;), included in -Wall. 12715 * Additional warning option -Wfloat-equal. 12716 * Improvements to -Wtraditional. 12717 * Fortran improvements are listed in [11]the Fortran documentation. 12718 12719 New Targets and Target Specific Improvements 12720 12721 * New x86 back end, generating much improved code. 12722 * Support for a generic i386-elf target contributed. 12723 * New option to emit x86 assembly code using Intel style syntax 12724 (-mintel-syntax). 12725 * HPUX 11 support contributed. 12726 * Improved PowerPC code generation, including scheduled prologue and 12727 epilogue. 12728 * Port of GCC to Intel's IA-64 processor contributed. 12729 * Port of GCC to Motorola's MCore 210 and 340 contributed. 12730 * New unified back-end for Arm, Thumb and StrongArm contributed. 12731 * Port of GCC to Intel's XScale processor contributed. 12732 * Port of GCC to Atmel's AVR microcontrollers contributed. 12733 * Port of GCC to Mitsubishi's D30V processor contributed. 12734 * Port of GCC to Matsushita's AM33 processor (a member of the MN10300 12735 processor family) contributed. 12736 * Port of GCC to Fujitsu's FR30 processor contributed. 12737 * Port of GCC to Motorola's 68HC11 and 68HC12 processors contributed. 12738 * Port of GCC to Sun's picoJava processor core contributed. 12739 12740 Documentation improvements 12741 12742 * Substantially rewritten and improved C preprocessor manual. 12743 * Many improvements to other documentation. 12744 * Manpages for gcc, cpp and gcov are now generated automatically from 12745 the master Texinfo manual, eliminating the problem of manpages 12746 being out of date. (The generated manpages are only extracts from 12747 the full manual, which is provided in Texinfo form, from which 12748 info, HTML, other formats and a printed manual can be generated.) 12749 * Generated info files are included in the release tarballs alongside 12750 their Texinfo sources, avoiding problems on some platforms with 12751 building makeinfo as part of the GCC distribution. 12752 12753 Other significant improvements 12754 12755 * Garbage collection used internally by the compiler for most memory 12756 allocation instead of obstacks. 12757 * Lengauer and Tarjan algorithm used for computing dominators in the 12758 CFG. This algorithm can be significantly faster and more space 12759 efficient than our older algorithm. 12760 * gccbug script provided to assist in submitting bug reports to our 12761 bug tracking system. (Bug reports previously submitted directly to 12762 our mailing lists, for which you received no bug tracking number, 12763 should be submitted again using gccbug if you can reproduce the 12764 problem with GCC 3.0.) 12765 * The internal libgcc library is [12]built as a shared library on 12766 systems that support it. 12767 * Extensive testsuite included with GCC, with many new tests. In 12768 addition to tests for GCC bugs that have been fixed, many tests 12769 have been added for language features, compiler warnings and 12770 builtin functions. 12771 * Additional language-independent warning options -Wpacked, -Wpadded, 12772 -Wunreachable-code and -Wdisabled-optimization. 12773 * Target-independent options -falign-functions, -falign-loops and 12774 -falign-jumps. 12775 12776 Plus a great many bug fixes and almost all the [13]features found in 12777 GCC 2.95. 12778 12779 12780 For questions related to the use of GCC, please consult these web 12781 pages and the [14]GCC manuals. If that fails, the 12782 [15]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12783 web pages and the development of GCC are welcome on our developer 12784 list at [16]gcc (a] gcc.gnu.org. All of [17]our lists have public 12785 archives. 12786 12787 Copyright (C) [18]Free Software Foundation, Inc. Verbatim copying and 12788 distribution of this entire article is permitted in any medium, 12789 provided this notice is preserved. 12790 12791 These pages are [19]maintained by the GCC team. Last modified 12792 2013-12-03[20]. 12793 12794 References 12795 12796 1. http://www.netbsd.org/ 12797 2. http://gcc.gnu.org/news/reorder.html 12798 3. http://gcc.gnu.org/news/ssa.html 12799 4. http://gcc.gnu.org/news/null.html 12800 5. http://gcc.gnu.org/news/unify.html 12801 6. http://gcc.gnu.org/gcc-3.0/c++features.html 12802 7. http://gcc.gnu.org/libstdc++/ 12803 8. http://gcc.gnu.org/news/inlining.html 12804 9. http://gcc.gnu.org/news/dependencies.html 12805 10. http://gcc.gnu.org/c99status.html 12806 11. http://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/News.html 12807 12. http://gcc.gnu.org/gcc-3.0/libgcc.html 12808 13. http://gcc.gnu.org/gcc-2.95/features.html 12809 14. http://gcc.gnu.org/onlinedocs/ 12810 15. mailto:gcc-help (a] gcc.gnu.org 12811 16. mailto:gcc (a] gcc.gnu.org 12812 17. http://gcc.gnu.org/lists.html 12813 18. http://www.fsf.org/ 12814 19. http://gcc.gnu.org/about.html 12815 20. http://validator.w3.org/check/referer 12816 ====================================================================== 12817 http://gcc.gnu.org/gcc-3.0/caveats.html 12818 12819 GCC 3.0 Caveats 12820 12821 * -fstrict-aliasing is now part of -O2 and higher optimization 12822 levels. This allows the compiler to assume the strictest aliasing 12823 rules applicable to the language being compiled. For C and C++, 12824 this activates optimizations based on the type of expressions. This 12825 optimization may thus break old, non-compliant code. 12826 * Enumerations are now properly promoted to int in function 12827 parameters and function returns. Normally this change is not 12828 visible, but when using -fshort-enums this is an ABI change. 12829 * The undocumented extension that allowed C programs to have a label 12830 at the end of a compound statement has been deprecated and may be 12831 removed in a future version. Programs that now generate a warning 12832 about this may be fixed by adding a null statement (a single 12833 semicolon) after the label. 12834 * The poorly documented extension that allowed string constants in C, 12835 C++ and Objective C to contain unescaped newlines has been 12836 deprecated and may be removed in a future version. Programs using 12837 this extension may be fixed in several ways: the bare newline may 12838 be replaced by \n, or preceded by \n\, or string concatenation may 12839 be used with the bare newline preceded by \n" and " placed at the 12840 start of the next line. 12841 * The Chill compiler is not included in GCC 3.0, because of the lack 12842 of a volunteer to convert it to use garbage collection. 12843 * Certain non-standard iostream methods from earlier versions of 12844 libstdc++ are not included in libstdc++ v3, i.e. filebuf::attach, 12845 ostream::form, and istream::gets. 12846 * The new C++ ABI is not yet fully supported by current (as of 12847 2001-07-01) releases and development versions of GDB, or any 12848 earlier versions. There is a problem setting breakpoints by line 12849 number, and other related issues that have been fixed in GCC 3.0 12850 but not yet handled in GDB: 12851 [1]http://gcc.gnu.org/ml/gcc-bugs/2001-06/msg00421.html 12852 12853 12854 For questions related to the use of GCC, please consult these web 12855 pages and the [2]GCC manuals. If that fails, the 12856 [3]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12857 web pages and the development of GCC are welcome on our developer 12858 list at [4]gcc (a] gcc.gnu.org. All of [5]our lists have public archives. 12859 12860 Copyright (C) [6]Free Software Foundation, Inc. Verbatim copying and 12861 distribution of this entire article is permitted in any medium, 12862 provided this notice is preserved. 12863 12864 These pages are [7]maintained by the GCC team. Last modified 12865 2012-11-02[8]. 12866 12867 References 12868 12869 1. http://gcc.gnu.org/ml/gcc-bugs/2001-06/msg00421.html 12870 2. http://gcc.gnu.org/onlinedocs/ 12871 3. mailto:gcc-help (a] gcc.gnu.org 12872 4. mailto:gcc (a] gcc.gnu.org 12873 5. http://gcc.gnu.org/lists.html 12874 6. http://www.fsf.org/ 12875 7. http://gcc.gnu.org/about.html 12876 8. http://validator.w3.org/check/referer 12877 ====================================================================== 12878 http://gcc.gnu.org/gcc-2.95/index.html 12879 12880 GCC 2.95 12881 12882 March 16, 2001: The GNU project and the GCC developers are pleased to 12883 announce the release of GCC version 2.95.3. 12884 12885 Release History 12886 12887 GCC 2.95.3 12888 March 16, 2001 12889 12890 GCC 2.95.2 12891 October 27, 1999 12892 12893 GCC 2.95.1 12894 August 19, 1999 12895 12896 GCC 2.95 12897 July 31, 1999. This is the first release of GCC since the April 12898 1999 GCC/EGCS reunification and includes nearly a year's worth 12899 of new development and bugfixes. 12900 12901 References and Acknowledgements 12902 12903 GCC used to stand for the GNU C Compiler, but since the compiler 12904 supports several other languages aside from C, it now stands for the 12905 GNU Compiler Collection. 12906 12907 The whole suite has been extensively [1]regression tested and 12908 [2]package tested. It should be reliable and suitable for widespread 12909 use. 12910 12911 The compiler has several new optimizations, new targets, new languages 12912 and other new features. See the [3]new features page for a more 12913 complete list of new features found in the GCC 2.95 releases. 12914 12915 The sources include installation instructions in both HTML and 12916 plaintext forms in the install directory in the distribution. However, 12917 the most up to date [4]installation instructions and [5]build/test 12918 status are on the web pages. We will update those pages as new 12919 information becomes available. 12920 12921 The GCC developers would like to thank the numerous people that have 12922 contributed new features, test results, bugfixes, etc to GCC. This 12923 [6]amazing group of volunteers is what makes GCC successful. 12924 12925 And finally, we can't in good conscience fail to mention some 12926 [7]caveats to using GCC 2.95. 12927 12928 Download GCC 2.95 from one of our many [8]mirror sites. 12929 12930 For additional information about GCC please see the [9]GCC project web 12931 server or contact the [10]GCC development mailing list. 12932 12933 12934 For questions related to the use of GCC, please consult these web 12935 pages and the [11]GCC manuals. If that fails, the 12936 [12]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 12937 web pages and the development of GCC are welcome on our developer 12938 list at [13]gcc (a] gcc.gnu.org. All of [14]our lists have public 12939 archives. 12940 12941 Copyright (C) [15]Free Software Foundation, Inc. Verbatim copying and 12942 distribution of this entire article is permitted in any medium, 12943 provided this notice is preserved. 12944 12945 These pages are [16]maintained by the GCC team. Last modified 12946 2012-11-02[17]. 12947 12948 References 12949 12950 1. http://gcc.gnu.org/gcc-2.95/regress.html 12951 2. http://gcc.gnu.org/gcc-2.95/othertest.html 12952 3. http://gcc.gnu.org/gcc-2.95/features.html 12953 4. http://gcc.gnu.org/install/ 12954 5. http://gcc.gnu.org/gcc-2.95/buildstat.html 12955 6. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 12956 7. http://gcc.gnu.org/gcc-2.95/caveats.html 12957 8. http://gcc.gnu.org/mirrors.html 12958 9. http://gcc.gnu.org/index.html 12959 10. mailto:gcc (a] gcc.gnu.org 12960 11. http://gcc.gnu.org/onlinedocs/ 12961 12. mailto:gcc-help (a] gcc.gnu.org 12962 13. mailto:gcc (a] gcc.gnu.org 12963 14. http://gcc.gnu.org/lists.html 12964 15. http://www.fsf.org/ 12965 16. http://gcc.gnu.org/about.html 12966 17. http://validator.w3.org/check/referer 12967 ====================================================================== 12968 http://gcc.gnu.org/gcc-2.95/features.html 12969 12970 GCC 2.95 New Features 12971 12972 * General Optimizer Improvements: 12973 + [1]Localized register spilling to improve speed and code 12974 density especially on small register class machines. 12975 + [2]Global CSE using lazy code motion algorithms. 12976 + [3]Improved global constant/copy propagation. 12977 + [4]Improved control flow graph analysis and manipulation. 12978 + [5]Local dead store elimination. 12979 + [6]Memory Load hoisting/store sinking in loops. 12980 + [7]Type based alias analysis is enabled by default. Note this 12981 feature will expose bugs in the Linux kernel. Please refer to 12982 the FAQ (as shipped with GCC 2.95) for additional information 12983 on this issue. 12984 + Major revamp of GIV detection, combination and simplification 12985 to improve loop performance. 12986 + Major improvements to register allocation and reloading. 12987 * New Languages and Language specific improvements 12988 + [8]Many C++ improvements. 12989 + [9]Many Fortran improvements. 12990 + [10]Java front-end has been integrated. [11]runtime library is 12991 available separately. 12992 + [12]ISO C99 support 12993 + [13]Chill front-end and runtime has been integrated. 12994 + Boehm garbage collector support in libobjc. 12995 + More support for various pragmas which appear in vendor 12996 include files 12997 * New Targets and Target Specific Improvements 12998 + [14]SPARC backend rewrite. 12999 + -mschedule=8000 will optimize code for PA8000 class 13000 processors; -mpa-risc-2-0 will generate code for PA2.0 13001 processors 13002 + Various micro-optimizations for the ia32 port. K6 13003 optimizations 13004 + Compiler will attempt to align doubles in the stack on the 13005 ia32 port 13006 + Alpha EV6 support 13007 + PowerPC 750 13008 + RS6000/PowerPC: -mcpu=401 was added as an alias for -mcpu=403. 13009 -mcpu=e603e was added to do -mcpu=603e and -msoft-float. 13010 + c3x, c4x 13011 + HyperSPARC 13012 + SparcLite86x 13013 + sh4 13014 + Support for new systems (OpenBSD, FreeBSD, UWIN, Interix, 13015 arm-linux) 13016 + vxWorks targets include support for vxWorks threads 13017 + StrongARM 110 and ARM9 support added. ARM Scheduling 13018 parameters rewritten. 13019 + Various changes to the MIPS port to avoid assembler macros, 13020 which in turn improves performance 13021 + Various performance improvements to the i960 port. 13022 + Major rewrite of ns32k port 13023 * Other significant improvements 13024 + [15]Ability to dump cfg information and display it using vcg. 13025 + The new faster scheme for fixing vendor header files is 13026 enabled by default. 13027 + Experimental internationalization support. 13028 + multibyte character support 13029 + Some compile-time speedups for pathological problems 13030 + Better support for complex types 13031 * Plus the usual mountain of bugfixes 13032 * Core compiler is based on the gcc2 development tree from Sept 30, 13033 1998, so we have all of the [16]features found in GCC 2.8. 13034 13035 Additional Changes in GCC 2.95.1 13036 13037 * Generic bugfixes and improvements 13038 + Various documentation fixes related to the GCC/EGCS merger. 13039 + Fix memory management bug which could lead to spurious aborts, 13040 core dumps or random parsing errors in the compiler. 13041 + Fix a couple bugs in the dwarf1 and dwarf2 debug record 13042 support. 13043 + Fix infinite loop in the CSE optimizer. 13044 + Avoid undefined behavior in compiler FP emulation code 13045 + Fix install problem when prefix is overridden on the make 13046 install command. 13047 + Fix problem with unwanted installation of assert.h on some 13048 systems. 13049 + Fix problem with finding the wrong assembler in a single tree 13050 build. 13051 + Avoid increasing the known alignment of a register that is 13052 already known to be a pointer. 13053 * Platform specific bugfixes and improvements 13054 + Codegen bugfix for prologue/epilogue for cpu32 target. 13055 + Fix long long code generation bug for the Coldfire target. 13056 + Fix various aborts in the SH compiler. 13057 + Fix bugs in libgcc support library for the SH. 13058 + Fix alpha ev6 code generation bug. 13059 + Fix problems with EXIT_SUCCESS/EXIT_FAILURE redefinitions on 13060 AIX platforms. 13061 + Fix -fpic code generation bug for rs6000/ppc svr4 targets. 13062 + Fix varargs/stdarg code generation bug for rs6000/ppc svr4 13063 targets. 13064 + Fix weak symbol handling for rs6000/ppc svr4 targets. 13065 + Fix various problems with 64bit code generation for the 13066 rs6000/ppc port. 13067 + Fix codegen bug which caused tetex to be mis-compiled on the 13068 x86. 13069 + Fix compiler abort in new cfg code exposed by x86 port. 13070 + Fix out of range array reference in code convert flat 13071 registers to the x87 stacked FP register file. 13072 + Fix minor vxworks configuration bug. 13073 + Fix return type of bsearch for SunOS 4.x. 13074 * Language & Runtime specific fixes. 13075 + The G++ signature extension has been deprecated. It will be 13076 removed in the next major release of G++. Use of signatures 13077 will result in a warning from the compiler. 13078 + Several bugs relating to templates and namespaces were fixed. 13079 + A bug that caused crashes when combining templates with -g on 13080 DWARF1 platforms was fixed. 13081 + Pointers-to-members, virtual functions, and multiple 13082 inheritance should now work together correctly. 13083 + Some code-generation bugs relating to function try blocks were 13084 fixed. 13085 + G++ is a little bit more lenient with certain archaic 13086 constructs than in GCC 2.95. 13087 + Fix to prevent shared library version #s from bring truncated 13088 to 1 digit 13089 + Fix missing std:: in the libstdc++ library. 13090 + Fix stream locking problems in libio. 13091 + Fix problem in java compiler driver. 13092 13093 Additional Changes in GCC 2.95.2 13094 13095 The -fstrict-aliasing is not enabled by default for GCC 2.95.2. While 13096 the optimizations performed by -fstrict-aliasing are valid according to 13097 the C and C++ standards, the optimization have caused some problems, 13098 particularly with old non-conforming code. 13099 13100 The GCC developers are experimenting with ways to warn users about code 13101 which violates the C/C++ standards, but those warnings are not ready 13102 for widespread use at this time. Rather than wait for those warnings 13103 the GCC developers have chosen to disable -fstrict-aliasing by default 13104 for the GCC 2.95.2 release. 13105 13106 We strongly encourage developers to find and fix code which violates 13107 the C/C++ standards as -fstrict-aliasing may be enabled by default in 13108 future releases. Use the option -fstrict-aliasing to re-enable these 13109 optimizations. 13110 * Generic bugfixes and improvements 13111 + Fix incorrectly optimized memory reference in global common 13112 subexpression elimination (GCSE) optimization pass. 13113 + Fix code generation bug in regmove.c in which it could 13114 incorrectly change a "const" value. 13115 + Fix bug in optimization of conditionals involving volatile 13116 memory references. 13117 + Avoid over-allocation of stack space for some procedures. 13118 + Fixed bug in the compiler which caused incorrect optimization 13119 of an obscure series of bit manipulations, shifts and 13120 arithmetic. 13121 + Fixed register allocator bug which caused teTeX to be 13122 mis-compiled on SPARC targets. 13123 + Avoid incorrect optimization of degenerate case statements for 13124 certain targets such as the ARM. 13125 + Fix out of range memory reference in the jump optimizer. 13126 + Avoid dereferencing null pointer in fix-header. 13127 + Fix test for GCC specific features so that it is possible to 13128 bootstrap with gcc-2.6.2 and older versions of GCC. 13129 + Fix typo in scheduler which could potentially cause out of 13130 range memory accesses. 13131 + Avoid incorrect loop reversal which caused incorrect code for 13132 certain loops on PowerPC targets. 13133 + Avoid incorrect optimization of switch statements on certain 13134 targets (for example the ARM). 13135 * Platform specific bugfixes and improvements 13136 + Work around bug in Sun V5.0 compilers which caused bootstrap 13137 comparison failures on SPARC targets. 13138 + Fix SPARC backend bug which caused aborts in final.c. 13139 + Fix sparc-hal-solaris2* configuration fragments. 13140 + Fix bug in sparc block profiling. 13141 + Fix obscure code generation bug for the PARISC targets. 13142 + Define __STDC_EXT__ for HPUX configurations. 13143 + Various POWERPC64 code generation bugfixes. 13144 + Fix abort for PPC targets using ELF (ex GNU/Linux). 13145 + Fix collect2 problems for AIX targets. 13146 + Correct handling of .file directive for PPC targets. 13147 + Fix bug in fix_trunc x86 patterns. 13148 + Fix x86 port to correctly pop the FP stack for functions that 13149 return structures in memory. 13150 + Fix minor bug in strlen x86 pattern. 13151 + Use stabs debugging instead of dwarf1 for x86-solaris targets. 13152 + Fix template repository code to handle leading underscore in 13153 mangled names. 13154 + Fix weak/weak alias support for OpenBSD. 13155 + GNU/Linux for the ARM has C++ compatible include files. 13156 * Language & Runtime specific fixes. 13157 + Fix handling of constructor attribute in the C front-end which 13158 caused problems building the Chill runtime library on some 13159 targets. 13160 + Fix minor problem merging type qualifiers in the C front-end. 13161 + Fix aliasing bug for pointers and references (C/C++). 13162 + Fix incorrect "non-constant initializer bug" when -traditional 13163 or -fwritable-strings is enabled. 13164 + Fix build error for Chill front-end on SunOS. 13165 + Do not complain about duplicate instantiations when using 13166 -frepo (C++). 13167 + Fix array bounds handling in C++ front-end which caused 13168 problems with dwarf debugging information in some 13169 circumstances. 13170 + Fix minor namespace problem. 13171 + Fix problem linking java programs. 13172 13173 Additional Changes in GCC 2.95.3 13174 13175 * Generic bugfixes and improvements 13176 + Fix numerous problems that caused incorrect optimization in 13177 the register reloading code. 13178 + Fix numerous problems that caused incorrect optimization in 13179 the loop optimizer. 13180 + Fix aborts in the functions build_insn_chain and scan_loops 13181 under some circumstances. 13182 + Fix an alias analysis bug. 13183 + Fix an infinite compilation bug in the combiner. 13184 + A few problems with complex number support have been fixed. 13185 + It is no longer possible for gcc to act as a fork bomb when 13186 installed incorrectly. 13187 + The -fpack-struct option should be recognized now. 13188 + Fixed a bug that caused incorrect code to be generated due to 13189 a lost stack adjustment. 13190 * Platform specific bugfixes and improvements 13191 + Support building ARM toolchains hosted on Windows. 13192 + Fix attribute calculations in ARM toolchains. 13193 + arm-linux support has been improved. 13194 + Fix a PIC failure on sparc targets. 13195 + On ix86 targets, the regparm attribute should now work 13196 reliably. 13197 + Several updates for the h8300 port. 13198 + Fix problem building libio with glibc 2.2. 13199 13200 13201 For questions related to the use of GCC, please consult these web 13202 pages and the [17]GCC manuals. If that fails, the 13203 [18]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13204 web pages and the development of GCC are welcome on our developer 13205 list at [19]gcc (a] gcc.gnu.org. All of [20]our lists have public 13206 archives. 13207 13208 Copyright (C) [21]Free Software Foundation, Inc. Verbatim copying and 13209 distribution of this entire article is permitted in any medium, 13210 provided this notice is preserved. 13211 13212 These pages are [22]maintained by the GCC team. Last modified 13213 2012-11-02[23]. 13214 13215 References 13216 13217 1. http://gcc.gnu.org/news/spill.html 13218 2. http://gcc.gnu.org/news/lcm.html 13219 3. http://gcc.gnu.org/news/cprop.html 13220 4. http://gcc.gnu.org/news/cfg.html 13221 5. http://gcc.gnu.org/news/dse.html 13222 6. http://gcc.gnu.org/news/hoist.html 13223 7. http://gcc.gnu.org/news/alias.html 13224 8. http://gcc.gnu.org/gcc-2.95/c++features.html 13225 9. http://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/News.html 13226 10. http://gcc.gnu.org/java/gcj-announce.txt 13227 11. http://gcc.gnu.org/news/javaannounce.html 13228 12. http://gcc.gnu.org/c99status.html 13229 13. http://gcc.gnu.org/news/chill.html 13230 14. http://gcc.gnu.org/news/sparc.html 13231 15. http://gcc.gnu.org/news/egcs-vcg.html 13232 16. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13233 17. http://gcc.gnu.org/onlinedocs/ 13234 18. mailto:gcc-help (a] gcc.gnu.org 13235 19. mailto:gcc (a] gcc.gnu.org 13236 20. http://gcc.gnu.org/lists.html 13237 21. http://www.fsf.org/ 13238 22. http://gcc.gnu.org/about.html 13239 23. http://validator.w3.org/check/referer 13240 ====================================================================== 13241 http://gcc.gnu.org/gcc-2.95/caveats.html 13242 13243 GCC 2.95 Caveats 13244 13245 * GCC 2.95 will issue an error for invalid asm statements that had 13246 been silently accepted by earlier versions of the compiler. This is 13247 particularly noticeable when compiling older versions of the Linux 13248 kernel (2.0.xx). Please refer to the FAQ (as shipped with GCC 2.95) 13249 for more information on this issue. 13250 * GCC 2.95 implements type based alias analysis to disambiguate 13251 memory references. Some programs, particularly the Linux kernel 13252 violate ANSI/ISO aliasing rules and therefore may not operate 13253 correctly when compiled with GCC 2.95. Please refer to the FAQ (as 13254 shipped with GCC 2.95) for more information on this issue. 13255 * GCC 2.95 has a known bug in its handling of complex variables for 13256 64bit targets. Instead of silently generating incorrect code, GCC 13257 2.95 will issue a fatal error for situations it can not handle. 13258 This primarily affects the Fortran community as Fortran makes more 13259 use of complex variables than C or C++. 13260 * GCC 2.95 has an integrated libstdc++, but does not have an 13261 integrated libg++. Furthermore old libg++ releases will not work 13262 with GCC 2.95. You can retrieve a recent copy of libg++ from the 13263 [1]GCC ftp server. 13264 Note most C++ programs only need libstdc++. 13265 * Exception handling may not work with shared libraries, particularly 13266 on alphas, hppas, rs6000/powerpc and mips based platforms. 13267 Exception handling is known to work on x86 GNU/Linux platforms with 13268 shared libraries. 13269 * In general, GCC 2.95 is more rigorous about rejecting invalid C++ 13270 code or deprecated C++ constructs than G++ 2.7, G++ 2.8, EGCS 1.0, 13271 or EGCS 1.1. As a result it may be necessary to fix C++ code before 13272 it will compile with GCC 2.95. 13273 * G++ is also converting toward the ISO C++ standard; as a result 13274 code which was previously valid (and thus accepted by other 13275 compilers and older versions of g++) may no longer be accepted. The 13276 flag -fpermissive may allow some non-conforming code to compile 13277 with GCC 2.95. 13278 * GCC 2.95 compiled C++ code is not binary compatible with EGCS 13279 1.1.x, EGCS 1.0.x or GCC 2.8.x. 13280 * GCC 2.95 does not have changes from the GCC 2.8 tree that were made 13281 between Sept 30, 1998 and April 30, 1999 (the official end of the 13282 GCC 2.8 project). Future GCC releases will include all the changes 13283 from the defunct GCC 2.8 sources. 13284 13285 13286 For questions related to the use of GCC, please consult these web 13287 pages and the [2]GCC manuals. If that fails, the 13288 [3]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13289 web pages and the development of GCC are welcome on our developer 13290 list at [4]gcc (a] gcc.gnu.org. All of [5]our lists have public archives. 13291 13292 Copyright (C) [6]Free Software Foundation, Inc. Verbatim copying and 13293 distribution of this entire article is permitted in any medium, 13294 provided this notice is preserved. 13295 13296 These pages are [7]maintained by the GCC team. Last modified 13297 2012-11-02[8]. 13298 13299 References 13300 13301 1. ftp://gcc.gnu.org/pub/gcc/infrastructure/libg++-2.8.1.3.tar.gz 13302 2. http://gcc.gnu.org/onlinedocs/ 13303 3. mailto:gcc-help (a] gcc.gnu.org 13304 4. mailto:gcc (a] gcc.gnu.org 13305 5. http://gcc.gnu.org/lists.html 13306 6. http://www.fsf.org/ 13307 7. http://gcc.gnu.org/about.html 13308 8. http://validator.w3.org/check/referer 13309 ====================================================================== 13310 http://gcc.gnu.org/egcs-1.1/index.html 13311 13312 EGCS 1.1 13313 13314 September 3, 1998: We are pleased to announce the release of EGCS 1.1. 13315 December 1, 1998: We are pleased to announce the release of EGCS 1.1.1. 13316 March 15, 1999: We are pleased to announce the release of EGCS 1.1.2. 13317 13318 EGCS is a free software project to further the development of the GNU 13319 compilers using an open development environment. 13320 13321 EGCS 1.1 is a major new release of the EGCS compiler system. It has 13322 been [1]extensively tested and is believed to be stable and suitable 13323 for widespread use. 13324 13325 EGCS 1.1 is based on an June 6, 1998 snapshot of the GCC 2.8 13326 development sources; it contains all of the new features found in GCC 13327 2.8.1 as well as all new development from GCC up to June 6, 1998. 13328 13329 EGCS 1.1 also contains many improvements and features not found in GCC 13330 or in older versions of EGCS: 13331 * Global common subexpression elimination and global constant/copy 13332 propagation (aka [2]gcse) 13333 * Ongoing improvements to the [3]alias analysis support to allow for 13334 better optimizations throughout the compiler. 13335 * Vastly improved [4]C++ compiler and integrated C++ runtime 13336 libraries. 13337 * Fixes for the /tmp symlink race security problems. 13338 * New targets including mips16, arm-thumb and 64 bit PowerPC. 13339 * Improvements to GNU Fortran (g77) compiler and runtime library made 13340 since g77 version 0.5.23. 13341 13342 See the [5]new features page for a more complete list of new features 13343 found in EGCS 1.1 releases. 13344 13345 EGCS 1.1.1 is a minor update to fix several serious problems in EGCS 13346 1.1: 13347 * General improvements and fixes 13348 + Avoid some stack overflows when compiling large functions. 13349 + Avoid incorrect loop invariant code motions. 13350 + Fix some core dumps on Linux kernel code. 13351 + Bring back the imake -Di386 and friends fix from EGCS 1.0.2. 13352 + Fix code generation problem in gcse. 13353 + Various documentation related fixes. 13354 * g++/libstdc++ improvements and fixes 13355 + MT safe EH fix for setjmp/longjmp based exception handling. 13356 + Fix a few bad interactions between optimization and exception 13357 handling. 13358 + Fixes for demangling of template names starting with "__". 13359 + Fix a bug that would fail to run destructors in some cases 13360 with -O2. 13361 + Fix 'new' of classes with virtual bases. 13362 + Fix crash building Qt on the Alpha. 13363 + Fix failure compiling WIFEXITED macro on GNU/Linux. 13364 + Fix some -frepo failures. 13365 * g77 and libf2c improvements and fixes 13366 + Various documentation fixes. 13367 + Avoid compiler crash on RAND intrinsic. 13368 + Fix minor bugs in makefiles exposed by BSD make programs. 13369 + Define _XOPEN_SOURCE for libI77 build to avoid potential 13370 problems on some 64-bit systems. 13371 + Fix problem with implicit endfile on rewind. 13372 + Fix spurious recursive I/O errors. 13373 * platform specific improvements and fixes 13374 + Match all versions of UnixWare7. 13375 + Do not assume x86 SVR4 or UnixWare targets can handle stabs. 13376 + Fix PPC/RS6000 LEGITIMIZE_ADDRESS macro and bug in conversion 13377 from unsigned ints to double precision floats. 13378 + Fix ARM ABI issue with NetBSD. 13379 + Fix a few arm code generation bugs. 13380 + Fixincludes will fix additional broken SCO OpenServer header 13381 files. 13382 + Fix a m68k backend bug which caused invalid offsets in reg+d 13383 addresses. 13384 + Fix problems with 64bit AIX 4.3 support. 13385 + Fix handling of long longs for varargs/stdarg functions on the 13386 ppc. 13387 + Minor fixes to CPP predefines for Windows. 13388 + Fix code generation problems with gpr<->fpr copies for 64bit 13389 ppc. 13390 + Fix a few coldfire code generation bugs. 13391 + Fix some more header file problems on SunOS 4.x. 13392 + Fix assert.h handling for RTEMS. 13393 + Fix Windows handling of TREE_SYMBOL_REFERENCED. 13394 + Fix x86 compiler abort in reg-stack pass. 13395 + Fix cygwin/windows problem with section attributes. 13396 + Fix Alpha code generation problem exposed by SMP Linux 13397 kernels. 13398 + Fix typo in m68k 32->64bit integer conversion. 13399 + Make sure target libraries build with -fPIC for PPC & Alpha 13400 targets. 13401 13402 EGCS 1.1.2 is a minor update to fix several serious problems in EGCS 13403 1.1.1: 13404 * General improvements and fixes 13405 + Fix bug in loop optimizer which caused the SPARC (and 13406 potentially other) ports to segfault. 13407 + Fix infinite recursion in alias analysis and combiner code. 13408 + Fix bug in regclass preferencing. 13409 + Fix incorrect loop reversal which caused incorrect code to be 13410 generated for several targets. 13411 + Fix return value for builtin memcpy. 13412 + Reduce compile time for certain loops which exposed quadratic 13413 behavior in the loop optimizer. 13414 + Fix bug which caused volatile memory to be written multiple 13415 times when only one write was needed/desired. 13416 + Fix compiler abort in caller-save.c 13417 + Fix combiner bug which caused incorrect code generation for 13418 certain division by constant operations. 13419 + Fix incorrect code generation due to a bug in range check 13420 optimizations. 13421 + Fix incorrect code generation due to mis-handling of clobbered 13422 values in CSE. 13423 + Fix compiler abort/segfault due to incorrect register 13424 splitting when unrolling loops. 13425 + Fix code generation involving autoincremented addresses with 13426 ternary operators. 13427 + Work around bug in the scheduler which caused qt to be 13428 mis-compiled on some platforms. 13429 + Fix code generation problems with -fshort-enums. 13430 + Tighten security for temporary files. 13431 + Improve compile time for codes which make heavy use of 13432 overloaded functions. 13433 + Fix multiply defined constructor/destructor symbol problems. 13434 + Avoid setting bogus RPATH environment variable during 13435 bootstrap. 13436 + Avoid GNU-make dependencies in the texinfo subdir. 13437 + Install CPP wrapper script in $(prefix)/bin if --enable-cpp. 13438 --enable-cpp=<dirname> can be used to specify an additional 13439 install directory for the cpp wrapper script. 13440 + Fix CSE bug which caused incorrect label-label refs to appear 13441 on some platforms. 13442 + Avoid linking in EH routines from libgcc if they are not 13443 needed. 13444 + Avoid obscure bug in aliasing code. 13445 + Fix bug in weak symbol handling. 13446 * Platform-specific improvements and fixes 13447 + Fix detection of PPro/PII on Unixware 7. 13448 + Fix compiler segfault when building spec99 and other programs 13449 for SPARC targets. 13450 + Fix code-generation bugs for integer and floating point 13451 conditional move instructions on the PPro/PII. 13452 + Use fixincludes to fix byteorder problems on i?86-*-sysv. 13453 + Fix build failure for the arc port. 13454 + Fix floating point format configuration for i?86-gnu port. 13455 + Fix problems with hppa1.0-hp-hpux10.20 configuration when 13456 threads are enabled. 13457 + Fix coldfire code generation bugs. 13458 + Fix "unrecognized insn" problems for Alpha and PPC ports. 13459 + Fix h8/300 code generation problem with floating point values 13460 in memory. 13461 + Fix unrecognized insn problems for the m68k port. 13462 + Fix namespace-pollution problem for the x86 port. 13463 + Fix problems with old assembler on x86 NeXT systems. 13464 + Fix PIC code-generation problems for the SPARC port. 13465 + Fix minor bug with LONG_CALLS in PowerPC SVR4 support. 13466 + Fix minor ISO namespace violation in Alpha varargs/stdarg 13467 support. 13468 + Fix incorrect "braf" instruction usage for the SH port. 13469 + Fix minor bug in va-sh which prevented its use with -ansi. 13470 + Fix problems recognizing and supporting FreeBSD. 13471 + Handle OpenBSD systems correctly. 13472 + Minor fixincludes fix for Digital UNIX 4.0B. 13473 + Fix problems with ctors/dtors in SCO shared libraries. 13474 + Abort instead of generating incorrect code for PPro/PII 13475 floating point conditional moves. 13476 + Avoid multiply defined symbols on GNU/Linux systems using 13477 libc-5.4.xx. 13478 + Fix abort in alpha compiler. 13479 * Fortran-specific fixes 13480 + Fix the IDate intrinsic (VXT) (in libg2c) so the returned year 13481 is in the documented, non-Y2K-compliant range of 0-99, instead 13482 of being returned as 100 in the year 2000. 13483 + Fix the `Date_and_Time' intrinsic (in libg2c) to return the 13484 milliseconds value properly in Values(8). 13485 + Fix the `LStat' intrinsic (in libg2c) to return device-ID 13486 information properly in SArray(7). 13487 13488 Each release includes installation instructions in both HTML and 13489 plaintext forms (see the INSTALL directory in the toplevel directory of 13490 the distribution). However, we also keep the most up to date 13491 [6]installation instructions and [7]build/test status on our web page. 13492 We will update those pages as new information becomes available. 13493 13494 The EGCS project would like to thank the numerous people that have 13495 contributed new features, test results, bugfixes, etc. This [8]amazing 13496 group of volunteers is what makes EGCS successful. 13497 13498 And finally, we can't in good conscience fail to mention some 13499 [9]caveats to using EGCS 1.1. 13500 13501 Download EGCS from egcs.cygnus.com (USA California). 13502 13503 The EGCS 1.1 release is also available on many mirror sites. 13504 [10]Goto mirror list to find a closer site. 13505 13506 13507 For questions related to the use of GCC, please consult these web 13508 pages and the [11]GCC manuals. If that fails, the 13509 [12]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13510 web pages and the development of GCC are welcome on our developer 13511 list at [13]gcc (a] gcc.gnu.org. All of [14]our lists have public 13512 archives. 13513 13514 Copyright (C) [15]Free Software Foundation, Inc. Verbatim copying and 13515 distribution of this entire article is permitted in any medium, 13516 provided this notice is preserved. 13517 13518 These pages are [16]maintained by the GCC team. Last modified 13519 2012-11-02[17]. 13520 13521 References 13522 13523 1. http://gcc.gnu.org/egcs-1.1/egcs-1.1-test.html 13524 2. http://gcc.gnu.org/news/gcse.html 13525 3. http://gcc.gnu.org/news/alias.html 13526 4. http://gcc.gnu.org/egcs-1.1/c++features.html 13527 5. http://gcc.gnu.org/egcs-1.1/features.html 13528 6. http://gcc.gnu.org/install/ 13529 7. http://gcc.gnu.org/egcs-1.1/buildstat.html 13530 8. http://gcc.gnu.org/onlinedocs/gcc/Contributors.html 13531 9. http://gcc.gnu.org/egcs-1.1/caveats.html 13532 10. http://gcc.gnu.org/mirrors.html 13533 11. http://gcc.gnu.org/onlinedocs/ 13534 12. mailto:gcc-help (a] gcc.gnu.org 13535 13. mailto:gcc (a] gcc.gnu.org 13536 14. http://gcc.gnu.org/lists.html 13537 15. http://www.fsf.org/ 13538 16. http://gcc.gnu.org/about.html 13539 17. http://validator.w3.org/check/referer 13540 ====================================================================== 13541 http://gcc.gnu.org/egcs-1.1/features.html 13542 13543 EGCS 1.1 new features 13544 13545 * Integrated GNU Fortran (g77) compiler and runtime library with 13546 improvements, based on g77 version 0.5.23. 13547 * Vast improvements in the C++ compiler; so many they have [1]page of 13548 their own! 13549 * Compiler implements [2]global common subexpression elimination and 13550 global copy/constant propagation. 13551 * More major improvements in the [3]alias analysis code. 13552 * More major improvements in the exception handling code to improve 13553 performance, lower static overhead and provide the infrastructure 13554 for future improvements. 13555 * The infamous /tmp symlink race security problems have been fixed. 13556 * The regmove optimization pass has been nearly completely rewritten 13557 to improve performance of generated code. 13558 * The compiler now recomputes register usage information before local 13559 register allocation. By providing more accurate information to the 13560 priority based allocator, we get better register allocation. 13561 * The register reloading phase of the compiler optimizes spill code 13562 much better than in previous releases. 13563 * Some bad interactions between the register allocator and 13564 instruction scheduler have been fixed, resulting in much better 13565 code for certain programs. Additionally, we have tuned the 13566 scheduler in various ways to improve performance of generated code 13567 for some architectures. 13568 * The compiler's branch shortening algorithms have been significantly 13569 improved to work better on targets which align jump targets. 13570 * The compiler now supports -Os to prefer optimizing for code space 13571 over optimizing for code speed. 13572 * The compiler will now totally eliminate library calls which compute 13573 constant values. This primarily helps targets with no integer 13574 div/mul support and targets without floating point support. 13575 * The compiler now supports an extensive "--help" option. 13576 * cpplib has been greatly improved and may be suitable for limited 13577 use. 13578 * Memory footprint for the compiler has been significantly reduced 13579 for some pathological cases. 13580 * The time to build EGCS has been improved for certain targets 13581 (particularly the alpha and mips platforms). 13582 * Many infrastructure improvements throughout the compiler, plus the 13583 usual mountain of bugfixes and minor improvements. 13584 * Target dependent improvements: 13585 + SPARC port now includes V8 plus and V9 support as well as 13586 performance tuning for Ultra class machines. The SPARC port 13587 now uses the Haifa scheduler. 13588 + Alpha port has been tuned for the EV6 processor and has an 13589 optimized expansion of memcpy/bzero. The Alpha port now uses 13590 the Haifa scheduler. 13591 + RS6000/PowerPC: support for the Power64 architecture and AIX 13592 4.3. The RS6000/PowerPC port now uses the Haifa scheduler. 13593 + x86: Alignment of static store data and jump targets is per 13594 Intel recommendations now. Various improvements throughout the 13595 x86 port to improve performance on Pentium processors 13596 (including improved epilogue sequences for Pentium chips and 13597 backend improvements which should help register allocation on 13598 all x86 variants. Conditional move support has been fixed and 13599 enabled for PPro processors. The x86 port also better supports 13600 64bit operations now. Unixware 7, a System V Release 5 target, 13601 is now supported and SCO OpenServer targets can support GAS. 13602 + MIPS has improved multiply/multiply-add support and now 13603 includes mips16 ISA support. 13604 + M68k has many micro-optimizations and Coldfire fixes. 13605 * Core compiler is based on the GCC development tree from June 9, 13606 1998, so we have all of the [4]features found in GCC 2.8. 13607 13608 13609 For questions related to the use of GCC, please consult these web 13610 pages and the [5]GCC manuals. If that fails, the 13611 [6]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13612 web pages and the development of GCC are welcome on our developer 13613 list at [7]gcc (a] gcc.gnu.org. All of [8]our lists have public archives. 13614 13615 Copyright (C) [9]Free Software Foundation, Inc. Verbatim copying and 13616 distribution of this entire article is permitted in any medium, 13617 provided this notice is preserved. 13618 13619 These pages are [10]maintained by the GCC team. Last modified 13620 2012-11-02[11]. 13621 13622 References 13623 13624 1. http://gcc.gnu.org/egcs-1.1/c++features.html 13625 2. http://gcc.gnu.org/news/gcse.html 13626 3. http://gcc.gnu.org/news/alias.html 13627 4. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13628 5. http://gcc.gnu.org/onlinedocs/ 13629 6. mailto:gcc-help (a] gcc.gnu.org 13630 7. mailto:gcc (a] gcc.gnu.org 13631 8. http://gcc.gnu.org/lists.html 13632 9. http://www.fsf.org/ 13633 10. http://gcc.gnu.org/about.html 13634 11. http://validator.w3.org/check/referer 13635 ====================================================================== 13636 http://gcc.gnu.org/egcs-1.1/caveats.html 13637 13638 EGCS 1.1 Caveats 13639 13640 * EGCS has an integrated libstdc++, but does not have an integrated 13641 libg++. Furthermore old libg++ releases will not work with EGCS; HJ 13642 Lu has made a libg++-2.8.1.2 snapshot available which may work with 13643 EGCS. 13644 Note most C++ programs only need libstdc++. 13645 * Exception handling may not work with shared libraries, particularly 13646 on alphas, hppas, rs6000/powerpc and mips based platforms. 13647 Exception handling is known to work on x86-linux platforms with 13648 shared libraries. 13649 * Some versions of the Linux kernel have bugs which prevent them from 13650 being compiled or from running when compiled by EGCS. See the FAQ 13651 (as shipped with EGCS 1.1) for additional information. 13652 * In general, EGCS is more rigorous about rejecting invalid C++ code 13653 or deprecated C++ constructs than g++-2.7, g++-2.8 or EGCS 1.0. As 13654 a result it may be necessary to fix C++ code before it will compile 13655 with EGCS. 13656 * G++ is also converting toward the ISO C++ standard; as a result 13657 code which was previously valid (and thus accepted by other 13658 compilers and older versions of g++) may no longer be accepted. 13659 * EGCS 1.1 compiled C++ code is not binary compatible with EGCS 1.0.x 13660 or GCC 2.8.x due to changes necessary to support thread safe 13661 exception handling. 13662 13663 13664 For questions related to the use of GCC, please consult these web 13665 pages and the [1]GCC manuals. If that fails, the 13666 [2]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13667 web pages and the development of GCC are welcome on our developer 13668 list at [3]gcc (a] gcc.gnu.org. All of [4]our lists have public archives. 13669 13670 Copyright (C) [5]Free Software Foundation, Inc. Verbatim copying and 13671 distribution of this entire article is permitted in any medium, 13672 provided this notice is preserved. 13673 13674 These pages are [6]maintained by the GCC team. Last modified 13675 2012-11-02[7]. 13676 13677 References 13678 13679 1. http://gcc.gnu.org/onlinedocs/ 13680 2. mailto:gcc-help (a] gcc.gnu.org 13681 3. mailto:gcc (a] gcc.gnu.org 13682 4. http://gcc.gnu.org/lists.html 13683 5. http://www.fsf.org/ 13684 6. http://gcc.gnu.org/about.html 13685 7. http://validator.w3.org/check/referer 13686 ====================================================================== 13687 http://gcc.gnu.org/egcs-1.0/index.html 13688 13689 EGCS 1.0 13690 13691 December 3, 1997: We are pleased to announce the release of EGCS 1.0. 13692 January 6, 1998: We are pleased to announce the release of EGCS 1.0.1. 13693 March 16, 1998: We are pleased to announce the release of EGCS 1.0.2. 13694 May 15, 1998 We are pleased to announce the release of EGCS 1.0.3. 13695 13696 EGCS is a collaborative effort involving several groups of hackers 13697 using an open development model to accelerate development and testing 13698 of GNU compilers and runtime libraries. 13699 13700 An important goal of EGCS is to allow wide scale testing of 13701 experimental features and optimizations; therefore, EGCS contains some 13702 features and optimizations which are still under development. However, 13703 EGCS has been carefully tested and should be comparable in quality to 13704 most GCC releases. 13705 13706 EGCS 1.0 is based on an August 2, 1997 snapshot of the GCC 2.8 13707 development sources; it contains nearly all of the new features found 13708 in GCC 2.8. 13709 13710 EGCS 1.0 also contains many improvements and features not found in GCC 13711 2.7 and even the GCC 2.8 series (which was released after the original 13712 EGCS 1.0 release). 13713 * Integrated C++ runtime libraries, including support for most major 13714 GNU/Linux systems! 13715 * The integrated libstdc++ library includes a verbatim copy of SGI's 13716 STL release. 13717 * Integrated GNU Fortran compiler. 13718 * New instruction scheduler. 13719 * New alias analysis code. 13720 13721 See the [1]new features page for a more complete list of new features. 13722 13723 EGCS 1.0.1 is a minor update to the EGCS 1.0 compiler to fix a few 13724 critical bugs and add support for Red Hat 5.0 Linux. Changes since the 13725 EGCS 1.0 release: 13726 * Add support for Red Hat 5.0 Linux and better support for Linux 13727 systems using glibc2. 13728 Many programs failed to link when compiled with EGCS 1.0 on Red Hat 13729 5.0 or on systems with newer versions of glibc2. EGCS 1.0.1 should 13730 fix these problems. 13731 * Compatibility with both EGCS 1.0 and GCC 2.8 libgcc exception 13732 handling interfaces. 13733 To avoid future compatibility problems, we strongly urge anyone who 13734 is planning on distributing shared libraries that contain C++ code 13735 to upgrade to EGCS 1.0.1 first. 13736 Soon after EGCS 1.0 was released, the GCC developers made some 13737 incompatible changes in libgcc's exception handling interfaces. 13738 These changes were needed to solve problems on some platforms. This 13739 means that GCC 2.8.0, when released, will not be seamlessly 13740 compatible with shared libraries built by EGCS 1.0. The reason is 13741 that the libgcc.a in GCC 2.8.0 will not contain a function needed 13742 by the old interface. 13743 The result of this is that there may be compatibility problems with 13744 shared libraries built by EGCS 1.0 when used with GCC 2.8.0. 13745 With EGCS 1.0.1, generated code uses the new (GCC 2.8.0) interface, 13746 and libgcc.a has the support routines for both the old and the new 13747 interfaces (so EGCS 1.0.1 and EGCS 1.0 code can be freely mixed, 13748 and EGCS 1.0.1 and GCC 2.8.0 code can be freely mixed). 13749 The maintainers of GCC 2.x have decided against including seamless 13750 support for the old interface in 2.8.0, since it was never 13751 "official", so to avoid future compatibility problems we recommend 13752 against distributing any shared libraries built by EGCS 1.0 that 13753 contain C++ code (upgrade to 1.0.1 and use that). 13754 * Various bugfixes in the x86, hppa, mips, and rs6000/ppc back ends. 13755 The x86 changes fix code generation errors exposed when building 13756 glibc2 and the usual GNU/Linux dynamic linker (ld.so). 13757 The hppa change fixes a compiler abort when configured for use with 13758 RTEMS. 13759 The MIPS changes fix problems with the definition of LONG_MAX on 13760 newer systems, allow for command line selection of the target ABI, 13761 and fix one code generation problem. 13762 The rs6000/ppc change fixes some problems with passing structures 13763 to varargs/stdarg functions. 13764 * A few machine independent bugfixes, mostly to fix code generation 13765 errors when building Linux kernels or glibc. 13766 * Fix a few critical exception handling and template bugs in the C++ 13767 compiler. 13768 * Fix Fortran namelist bug on alphas. 13769 * Fix build problems on x86-solaris systems. 13770 13771 EGCS 1.0.2 is a minor update to the EGCS 1.0.1 compiler to fix several 13772 serious problems in EGCS 1.0.1. 13773 * General improvements and fixes 13774 + Memory consumption significantly reduced, especially for 13775 templates and inline functions. 13776 + Fix various problems with glibc2.1. 13777 + Fix loop optimization bug exposed by rs6000/ppc port. 13778 + Fix to avoid potential code generation problems in jump.c. 13779 + Fix some undefined symbol problems in dwarf1 debug support. 13780 * g++/libstdc++ improvements and fixes 13781 + libstdc++ in the EGCS release has been updated and should be 13782 link compatible with libstdc++-2.8. 13783 + Various fixes in libio/libstdc++ to work better on GNU/Linux 13784 systems. 13785 + Fix problems with duplicate symbols on systems that do not 13786 support weak symbols. 13787 + Memory corruption bug and undefined symbols in bastring have 13788 been fixed. 13789 + Various exception handling fixes. 13790 + Fix compiler abort for very long thunk names. 13791 * g77 improvements and fixes 13792 + Fix compiler crash for omitted bound in Fortran CASE 13793 statement. 13794 + Add missing entries to g77 lang-options. 13795 + Fix problem with -fpedantic in the g77 compiler. 13796 + Fix "backspace" problem with g77 on alphas. 13797 + Fix x86 backend problem with Fortran literals and -fpic. 13798 + Fix some of the problems with negative subscripts for g77 on 13799 alphas. 13800 + Fixes for Fortran builds on cygwin32/mingw32. 13801 * platform specific improvements and fixes 13802 + Fix long double problems on x86 (exposed by glibc). 13803 + x86 ports define i386 again to keep imake happy. 13804 + Fix exception handling support on NetBSD ports. 13805 + Several changes to collect2 to fix many problems with AIX. 13806 + Define __ELF__ for GNU/Linux on rs6000. 13807 + Fix -mcall-linux problem on GNU/Linux on rs6000. 13808 + Fix stdarg/vararg problem for GNU/Linux on rs6000. 13809 + Allow autoconf to select a proper install problem on AIX 3.1. 13810 + m68k port support includes -mcpu32 option as well as cpu32 13811 multilibs. 13812 + Fix stdarg bug for irix6. 13813 + Allow EGCS to build on irix5 without the gnu assembler. 13814 + Fix problem with static linking on sco5. 13815 + Fix bootstrap on sco5 with native compiler. 13816 + Fix for abort building newlib on H8 target. 13817 + Fix fixincludes handling of math.h on SunOS. 13818 + Minor fix for Motorola 3300 m68k systems. 13819 13820 EGCS 1.0.3 is a minor update to the EGCS 1.0.2 compiler to fix a few 13821 problems reported by Red Hat for builds of Red Hat 5.1. 13822 * Generic bugfixes: 13823 + Fix a typo in the libio library which resulted in incorrect 13824 behavior of istream::get. 13825 + Fix the Fortran negative array index problem. 13826 + Fix a major problem with the ObjC runtime thread support 13827 exposed by glibc2. 13828 + Reduce memory consumption of the Haifa scheduler. 13829 * Target specific bugfixes: 13830 + Fix one x86 floating point code generation bug exposed by 13831 glibc2 builds. 13832 + Fix one x86 internal compiler error exposed by glibc2 builds. 13833 + Fix profiling bugs on the Alpha. 13834 + Fix ImageMagick & emacs 20.2 build problems on the Alpha. 13835 + Fix rs6000/ppc bug when converting values from integer types 13836 to floating point types. 13837 13838 The EGCS 1.0 releases include installation instructions in both HTML 13839 and plaintext forms (see the INSTALL directory in the toplevel 13840 directory of the distribution). However, we also keep the most up to 13841 date [2]installation instructions and [3]build/test status on our web 13842 page. We will update those pages as new information becomes available. 13843 13844 And, we can't in good conscience fail to mention some [4]caveats to 13845 using EGCS. 13846 13847 Update: Big thanks to Stanford for providing a high speed link for 13848 downloading EGCS (go.cygnus.com)! 13849 13850 Download EGCS from ftp.cygnus.com (USA California) or go.cygnus.com 13851 (USA California -- High speed link provided by Stanford). 13852 13853 The EGCS 1.0 release is also available many mirror sites. 13854 [5]Goto mirror list to find a closer site 13855 13856 We'd like to thank the numerous people that have contributed new 13857 features, test results, bugfixes, etc. Unfortunately, they're far too 13858 numerous to mention by name. 13859 13860 13861 For questions related to the use of GCC, please consult these web 13862 pages and the [6]GCC manuals. If that fails, the 13863 [7]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13864 web pages and the development of GCC are welcome on our developer 13865 list at [8]gcc (a] gcc.gnu.org. All of [9]our lists have public archives. 13866 13867 Copyright (C) [10]Free Software Foundation, Inc. Verbatim copying and 13868 distribution of this entire article is permitted in any medium, 13869 provided this notice is preserved. 13870 13871 These pages are [11]maintained by the GCC team. Last modified 13872 2013-12-03[12]. 13873 13874 References 13875 13876 1. http://gcc.gnu.org/egcs-1.0/features.html 13877 2. http://gcc.gnu.org/install/ 13878 3. http://gcc.gnu.org/egcs-1.0/buildstat.html 13879 4. http://gcc.gnu.org/egcs-1.0/caveats.html 13880 5. http://gcc.gnu.org/mirrors.html 13881 6. http://gcc.gnu.org/onlinedocs/ 13882 7. mailto:gcc-help (a] gcc.gnu.org 13883 8. mailto:gcc (a] gcc.gnu.org 13884 9. http://gcc.gnu.org/lists.html 13885 10. http://www.fsf.org/ 13886 11. http://gcc.gnu.org/about.html 13887 12. http://validator.w3.org/check/referer 13888 ====================================================================== 13889 http://gcc.gnu.org/egcs-1.0/features.html 13890 13891 EGCS 1.0 features 13892 13893 * Core compiler is based on the gcc2 development tree from Aug 2, 13894 1997, so we have most of the [1]features found in GCC 2.8. 13895 * Integrated GNU Fortran compiler based on g77-0.5.22-19970929. 13896 * Vast improvements in the C++ compiler; so many they have [2]page of 13897 their own! 13898 * Integrated C++ runtime libraries, including support for most major 13899 GNU/Linux systems! 13900 * New instruction scheduler from IBM Haifa which includes support for 13901 function wide instruction scheduling as well as superscalar 13902 scheduling. 13903 * Significantly improved alias analysis code. 13904 * Improved register allocation for two address machines. 13905 * Significant code generation improvements for Fortran code on 13906 Alphas. 13907 * Various optimizations from the g77 project as well as improved loop 13908 optimizations. 13909 * Dwarf2 debug format support for some targets. 13910 * egcs libstdc++ includes the SGI STL implementation without changes. 13911 * As a result of these and other changes, egcs libstc++ is not binary 13912 compatible with previous releases of libstdc++. 13913 * Various new ports -- UltraSPARC, Irix6.2 & Irix6.3 support, The SCO 13914 Openserver 5 family (5.0.{0,2,4} and Internet FastStart 1.0 and 13915 1.1), Support for RTEMS on several embedded targets, Support for 13916 arm-linux, Mitsubishi M32R, Hitachi H8/S, Matsushita MN102 and 13917 MN103, NEC V850, Sparclet, Solaris & GNU/Linux on PowerPCs, etc. 13918 * Integrated testsuites for gcc, g++, g77, libstdc++ and libio. 13919 * RS6000/PowerPC ports generate code which can run on all 13920 RS6000/PowerPC variants by default. 13921 * -mcpu= and -march= switches for the x86 port to allow better 13922 control over how the x86 port generates code. 13923 * Includes the template repository patch (aka repo patch); note the 13924 new template code makes repo obsolete for ELF systems using gnu-ld 13925 such as GNU/Linux. 13926 * Plus the usual assortment of bugfixes and improvements. 13927 13928 13929 For questions related to the use of GCC, please consult these web 13930 pages and the [3]GCC manuals. If that fails, the 13931 [4]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13932 web pages and the development of GCC are welcome on our developer 13933 list at [5]gcc (a] gcc.gnu.org. All of [6]our lists have public archives. 13934 13935 Copyright (C) [7]Free Software Foundation, Inc. Verbatim copying and 13936 distribution of this entire article is permitted in any medium, 13937 provided this notice is preserved. 13938 13939 These pages are [8]maintained by the GCC team. Last modified 13940 2012-11-02[9]. 13941 13942 References 13943 13944 1. http://gcc.gnu.org/egcs-1.0/features-2.8.html 13945 2. http://gcc.gnu.org/egcs-1.0/c++features.html 13946 3. http://gcc.gnu.org/onlinedocs/ 13947 4. mailto:gcc-help (a] gcc.gnu.org 13948 5. mailto:gcc (a] gcc.gnu.org 13949 6. http://gcc.gnu.org/lists.html 13950 7. http://www.fsf.org/ 13951 8. http://gcc.gnu.org/about.html 13952 9. http://validator.w3.org/check/referer 13953 ====================================================================== 13954 http://gcc.gnu.org/egcs-1.0/caveats.html 13955 13956 EGCS 1.0 Caveats 13957 13958 * EGCS has an integrated libstdc++, but does not have an integrated 13959 libg++. Furthermore old libg++ releases will not work with egc; HJ 13960 Lu has made a libg++-2.8.1.2 available which may work with EGCS. 13961 Note most C++ programs only need libstdc++. 13962 * Note that using -pedantic or -Wreturn-type can cause an explosion 13963 in the amount of memory needed for template-heavy C++ code, such as 13964 code that uses STL. Also note that -Wall includes -Wreturn-type, so 13965 if you use -Wall you will need to specify -Wno-return-type to turn 13966 it off. 13967 * Exception handling may not work with shared libraries, particularly 13968 on alphas, hppas, and mips based platforms. Exception handling is 13969 known to work on x86-linux platforms with shared libraries. 13970 * Some versions of the Linux kernel have bugs which prevent them from 13971 being compiled or from running when compiled by EGCS. See the FAQ 13972 (as shipped with EGCS 1.0) for additional information. 13973 * In general, EGCS is more rigorous about rejecting invalid C++ code 13974 or deprecated C++ constructs than G++ 2.7. As a result it may be 13975 necessary to fix C++ code before it will compile with EGCS. 13976 * G++ is also aggressively tracking the C++ standard; as a result 13977 code which was previously valid (and thus accepted by other 13978 compilers and older versions of G++) may no longer be accepted. 13979 * EGCS 1.0 may not work with Red Hat Linux 5.0 on all targets. EGCS 13980 1.0.x and later releases should work with Red Hat Linux 5.0. 13981 13982 13983 For questions related to the use of GCC, please consult these web 13984 pages and the [1]GCC manuals. If that fails, the 13985 [2]gcc-help (a] gcc.gnu.org mailing list might help. Comments on these 13986 web pages and the development of GCC are welcome on our developer 13987 list at [3]gcc (a] gcc.gnu.org. All of [4]our lists have public archives. 13988 13989 Copyright (C) [5]Free Software Foundation, Inc. Verbatim copying and 13990 distribution of this entire article is permitted in any medium, 13991 provided this notice is preserved. 13992 13993 These pages are [6]maintained by the GCC team. Last modified 13994 2012-11-02[7]. 13995 13996 References 13997 13998 1. http://gcc.gnu.org/onlinedocs/ 13999 2. mailto:gcc-help (a] gcc.gnu.org 14000 3. mailto:gcc (a] gcc.gnu.org 14001 4. http://gcc.gnu.org/lists.html 14002 5. http://www.fsf.org/ 14003 6. http://gcc.gnu.org/about.html 14004 7. http://validator.w3.org/check/referer 14005 ====================================================================== 14006
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