HACKS revision 1.44
1 # $NetBSD: HACKS,v 1.44 2005/05/06 19:32:30 jmc Exp $ 2 # 3 # This file is intended to document workarounds for currently unsolved 4 # (mostly) compiler bugs. 5 # 6 # Format: 7 # hack title 8 # cdate creation date 9 # mdate mod date 10 # who responsible developer 11 # port ... 12 # affected ports, space separated, if not "all" 13 # file affected file : revision : line from : line to 14 # affected files and revision and line numbers describing hack 15 # multiple lines if necessary. 16 # pr NNNN ... 17 # problem reports this hack works around, if known. Space 18 # separated. 19 # regress src/regress/directory/where/test/found 20 # regression test directories, if available. 21 # descr 22 # insert short informal description (multi-line). (Longer ones 23 # should be in the PR database. More formal descriptions might 24 # be in the regress tree. See above). 25 # kcah 26 # closing bracket. 27 # 28 # this is a comment. 29 30 hack netstat ieee1394 address printing. 31 mdate 14 Nov 2000 32 who matt 33 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 34 descr 35 Because the current implementation of IP over IEEE1394, the 36 fw device address contains more than just the IEEE1394 EUI-64. 37 So when printing out IEEE1394 addresses, ignore the extra stuff. 38 kcah 39 40 hack xterm vs. libterm 41 mdate 01 Aug 2000 42 who jdc 43 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 44 pr 10383 45 descr 46 In order to extend the termcap string over 1023 bytes, a ZZ entry was 47 introduced to point to a memory location containing the full entry. 48 Without this hack, xterm will export a termcap containing the ZZ 49 entry, which will then be ignored by libterm. As xterm modifies the 50 exported termcap, this would cause those modifications to be ignored. 51 kcah 52 53 hack wi-at-big-endian-bus 54 cdate 15 Mar 2002 55 who martin 56 file dev/ic/wireg.h 57 descr Add an option to access the underlying bus in big endian byte order 58 to work around deficiencies in bus_space_{read,write}_* macros. 59 Those don't allow the implementation of a proper pcmcia bus space 60 tag. 61 kcah 62 63 hack specific knowledge of colours in curses code 64 cdate Sun Apr 6 11:05:24 BST 2003 65 who jdc 66 file lib/libcurses/color.c : r1.24 67 descr 68 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 69 Fix is to enhance libtermcap to understand terminfo-style % sequences. 70 See also: 71 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 72 kcah 73 74 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 75 cdate 21 Aug 2003 76 who he 77 file sys/miscfs/procfs/procfs_linux.c : 1.14 78 descr 79 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 80 literals/constants, but refer to variables of a type which is 81 not "unsigned long", causing compilation of procfs_linux.c to 82 fail with "makes integer from pointer without a cast". This 83 is observed on e.g. the sun3 port. Ideally the "types" for 84 symbols should be consistent across all ports. 85 kcah 86 87 hack GCC2 isn't C99 88 cdate 5 December 2003 89 who mrg 90 file gnu/dist/binutils/ld/ldlex.c: r1.2 91 descr 92 ldlex.c is generated from ldlex.l and we get macro redefinition 93 errors from it if __STDC_VERSION__ is not C99 compliant. This 94 hack forces NetBSD 1.6 and later systems to also include <stdint.h> 95 to get the relevant definitions. This hack should be backed out 96 when all platforms have switched away from GCC2. 97 kcah 98 99 hack gcc-strict-aliasing 100 cdate 6 August 2004 101 who junyoung 102 pr 26516 103 file src/usr.sbin/racoon/racoon/Makefile : 1.21 104 descr 105 GCC issues a warning "dereferencing type-punned pointer will break 106 strict-aliasing rules" when compiling 107 crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this 108 is due to use of type casting in a non-standard way in the code and 109 not a compiler bug. Once a new release of KAME with a proper fix 110 applied is imported this should be backed out. 111 kcah 112 113 114 port vax 115 116 hack gcc 2.95/vax can't handle __used__ in mcount.c 117 cdate Fri May 6 14:30:53 CDT 2005 118 who jmc 119 file src/lib/libc/gmon/mcount.c 1.17 120 descr 121 Recent changes to mark this as __used__ to prevent optimization 122 away on sparc64 don't work on 2.95 vax. Ifdef'd back in the 123 old __unused__ if on vax. 124 125 hack gcc 2.95/vax cannot handle __builtin_ffs() 126 cdate Fri Aug 23 21:31:15 CEST 2002 127 who ragge 128 file sys/lib/libkern/libkern.h : 1.42 129 descr 130 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 131 added this feature to GCC 3 so it can be removed when switching. 132 133 134 hack gcc-vax-libbz2 135 mdate 27 Jun 2002 136 who thorpej 137 file lib/libbz2/Makefile 138 descr 139 libbz2 is mis-compiled with optimization with GCC 2.95.3 140 on VAX. -O0 works around this problem. 141 kcah 142 143 hack gawk 144 mdate 8 Nov 2003 145 who ragge 146 file gnu/usr.bin/gawk/Makefile 147 descr 148 gawk is mis-compiled with optimization with GCC 2.95.3 149 on VAX. -O0 works around this problem. 150 kcah 151 152 hack vax Toolchain bug 153 cdate 28 Mar 2003 154 who he 155 file sys/arch/vax/vax/intvec.S : 1.5 156 descr 157 Workaround for PR toolchain/20924. The assembler apparently 158 tries to range-check byte offsets when it doesn't have 159 sufficient information to make that decision. 160 Workaround uses `brw' instead of `brb' instruction. 161 kcah 162 163 hack vax gcc 2.95.3 -Wuninitialized workarounds 164 cdate 6 Nov 2003 165 who he 166 file sys/dev/bi/if_ni.c : 1.22 167 file sys/arch/vax/vax/ctu.c : 1.20 168 descr 169 Workaround for gcc 2.95.3 failing to detect that certain 170 variables will be initialized; so that this code compiles 171 with -Wuninitialized. Should be reviewed and possibly 172 reverted when gcc 3.3.2 is ready for vax. 173 kcah 174 175 hack vax gcc 2.95.3 structure initialization 176 cdat 13 May 2004 177 who cl 178 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 179 descr 180 Workaround for gcc 2.95.3 failing to initialize structures 181 and/or unions inside structures using nested designators. 182 Should be reverted when gcc >=3.3.3 is ready for vax. 183 kcah 184 185 hack vax gcc 2.95.3 needs -I. to build nslexer.c 186 cdat 6 Jun 2004 187 who mhitch 188 file lib/libc/arch/vax/Makefile.inc : 1.6 189 descr 190 It appears necessary to add -I. to CPPFLAGS when building 191 nslesxer.c. This may be caused by gcc 2.95.3 being used. 192 Should be reverted when a newer gcc is ready for vax. 193 kcah 194 195 hack vax gcc 2.95.3 doesn't understand "-std=c99" 196 cdat 5 April 2005 197 who tron 198 file src/share/mk/bsd.sys.mk 199 descr 200 We cannot use "-std=c99" for compiler warning level 4 and above 201 because gcc 2.95.3 doesn't support that option. 202 kcah 203 204 port sparc64 205 206 hack binutil-2.11-sparc64-pltrela 207 mdate 14 Aug 2001 208 who eeh 209 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 210 descr 211 The first four PLT entries are reserved. There is some 212 disagreement whether they should have associated relocation 213 entries. Both the SPARC 32-bit and 64-bit ELF specifications 214 say that they should have relocation entries, but the 32-bit 215 SPARC binutils do not generate them, and now the 64-bit SPARC 216 binutils have stopped generating them too. 217 218 To provide binary compatibility, we will check the first entry, 219 if it is reserved it should not be of the type JMP_SLOT. If it 220 is JMP_SLOT, then the 4 reserved entries were not generated and 221 our index is 4 entries too far, so we frob the rela pointer. 222 kcah 223 224 225 port arm 226 227 hack gcc-unsigned-compare 228 cdate 09 Mar 2002 229 mdate 18 Mar 2002 230 who bjh21 231 file dist/bind/lib/nameser/ns_parse.c : 1.3 232 file dist/dhcp/minires/ns_parse.c : 1.3 233 file dist/dhcp/omapip/result.c : 1.2 234 file dist/dhcp/server/failover.c : 1.3 235 file gnu/dist/gawk/eval.c : 1.4 236 file gnu/dist/toolchain/bfd/bfd.c : 1.2 237 file gnu/dist/toolchain/bfd/format.c : 1.2 238 file gnu/dist/toolchain/gdb/target.c : 1.2 239 file sys/kern/vfs_subr.c : 1.172 240 descr When checking that a potentially-unsigned enum is >= 0, assign 241 it to an int first. This is necessary to avoid "comparison is 242 always true" warnings with -fshort-enums. Casting to an int 243 really should be enough, but turns out not to be. 244 kcah 245 246 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 247 cdate Tue Oct 28 18:02:16 GMT 2003 248 who skrll 249 pr 23044 250 file sys/arch/arm/conf/Makefile.arm : 1.19 251 descr 252 Performing a build.sh tools on a CATS with NFS mounted 253 obj and src directories results in "panic: receive 1" 254 The hack is to compile sys/kern/uipc_socket.c with 255 -fno-strict-aliasing 256 kcah 257 258 259 port pc532 260 261 hack egcs-pc532-ip6_mroute 262 cdate 09 Jul 2002 263 who simonb 264 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 265 file sys/arch/pc532/conf/files.pc532 : 1.47 266 descr 267 egcs 1.1.2 gets an "internal error--insn does not satisfy its 268 constraints" error compiling ip6_mroute.c with -O2 or greater. 269 -O1 works around this problem. 270 kcah 271 272 hack gcc-pc532-duffs_device 273 cdate Mon Oct 27 07:23:05 UTC 2003 274 who simonb 275 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 276 file sys/arch/pc532/conf/files.pc532 : 1.52 277 pr GCC PR optimization/5230 278 descr 279 gcc incorrectly gives an "unreachable code at beginning of 280 switch statement" for a Duff's device construct in 281 arch/pc532/dev/ncr.c. There is no way to disable just this 282 warning, so -Wno-error is turned on for this file. 283 kcah 284 285 hack gcc332-cppmacro-ice 286 cdate Sun Dec 7 12:48:33 UTC 2003 287 who simonb 288 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 289 descr 290 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 291 The hack is to use -O1 for this file. Fixed in gcc 292 -current mainline, unable to work out where the fix is 293 right now. 294 kcah 295 296 297 port sh3 298 299 hack gcc-sh3-sed 300 mdate 23 Apr 2002 301 who thorpej 302 file usr.bin/sed/Makefile : 1.9 : 9 : 13 303 descr 304 The in-tree GCC 2.95.3-based compiler ICEs when building 305 with optimization for SuperH. Hack is to build with -O0. 306 kcah 307 308 309 port sh5 310 311 hack SuperH SH5 Toolchain Bugs 312 cdate 11 Jul 2002 313 who scw 314 file usr.sbin/ndbootd/ndbootd.c : 1.6 315 file usr.sbin/traceroute/traceroute.c : 1.48 316 descr 317 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 318 compiler error when assigning a bit-wise inverted value 319 under some circumstances. 320 Work around it by splitting the statement into two. 321 kcah 322 323 hack SuperH SH5 Toolchain Bugs 324 cdate 17 May 2003 325 who scw 326 file lib/libpthread/pthread_lock.c : 1.7 327 descr 328 The SuperH SH5 toolchain generates incorrect PIC code when 329 faced with a symbol which is declared extern, but has local 330 scope due to being defined within an asm() statement (without 331 being declared .globl in that statement). Work around it by 332 adding the .globl. 333 kcah 334 335 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 336 cdate Sun Dec 7 19:44:05 GMT 2003 337 who scw 338 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 339 descr 340 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 341 Drop to -O1 for now when building for sh5. 342 kcah 343 344 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 345 cdate Sun Dec 7 21:10:46 GMT 2003 346 who scw 347 file gnu/lib/libbfd/Makefile : 1.39 348 descr 349 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 350 and elf64.c at -O2. 351 Drop to -O1 for now when building for sh5. 352 kcah 353 354 355 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 356 cdate Sun Dec 7 19:44:05 GMT 2003 357 who scw 358 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 359 descr 360 Gcc3 for sh5 issues a warning: 361 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 362 mutually exclusive equal-tests is always 0. 363 This causes the build to fail because of -Werror. 364 Work-around by defining NOGCCERROR when building for sh5. 365 kcah 366 367 hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c 368 cdate Thu Nov 11 00:35:33 UTC 2004 369 who he 370 file usr.sbin/bind/libdns/Makefile/1.2 371 descr 372 Gcc3 for sh5 gets an ICE compiling these files at -O2. 373 Drop to -O1 for now when building for sh5. 374 kcah 375 376 377 port sun2 378 379 hack gcc 3.3.2/mdsetimage 380 cdate Tue Oct 28 18:43:05 EST 2003 381 who fredette 382 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 383 descr 384 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 385 this hack uses -O0 to avoid the problem. 386 kcah 387 388 hack gcc 3.3.2/installboot/ffs.c 389 cdate Tue Oct 28 18:43:05 EST 2003 390 who fredette 391 file usr.sbin/installboot/Makefile : 1.26 392 descr 393 ffs.c causes cc1 to barf for as-yet unknown reasons. this 394 hack uses -O0 to avoid the problem. 395 kcah 396 397 398 port sun2, m68k 399 400 hack gcc 3.3.2/gcc/ra-colorize.c 401 cdate Wed Nov 5 11:03:13 EST 2003 402 who mrg 403 file gnu/usr.bin/gcc/backend/Makefile : 1.11 404 descr 405 ra-colorize.c causes a whole spew of unreferenced .L* local 406 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 407 kcah 408 409 port sparc64 410 411 hack disable optimzations for uvm_bio.c on 32 bit kernels 412 cdate Sun Mar 21 14:14:04 MET 2004 413 who martin 414 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 415 file sys/arch/sparc64/conf/files.sparc64 : 1.93 416 descr 417 The sparc compiler miscompiles uvm_bio.c when using 418 any optimization. This results in ubc_release panics. 419 kcah 420 421 port macppc 422 423 hack remove inline from rotate_{left,right} 424 cdate Tue Feb 22 13:43:25 EST 2005 425 who christos 426 file src/dist/bind/lib/dns/rbt.c 427 descr 428 The macppc gcc-3.3 compiler miscompiles rbt.c when these 429 functions are inlined. The error is: 430 .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed 431 .* named[368]: exiting (due to assertion failure) 432 This is reportedly fixed in gcc-3.4 433 kcah 434
Indexes created Wed Nov 05 22:09:55 GMT 2025