HACKS revision 1.42.2.1
1 # $NetBSD: HACKS,v 1.42.2.1 2006/02/03 05:19:41 riz 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 hack rbus resource allocation work around 114 cdate 31 January 2006 115 who jnemeth 116 file src/sys/dev/pcmcia/aic_pcmcia.c : 1.32 117 pr 26909 31245 118 descr 119 On some cards, the card align field property value interferes 120 with the rbus resource allocation causing the card not to 121 configure properly. Setting it to 0 fixes the problem but it 122 is not the proper solution. 123 kcah 124 125 port vax 126 127 hack gcc 2.95/vax cannot handle __builtin_ffs() 128 cdate Fri Aug 23 21:31:15 CEST 2002 129 who ragge 130 file sys/lib/libkern/libkern.h : 1.42 131 descr 132 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 133 added this feature to GCC 3 so it can be removed when switching. 134 kcah 135 136 hack gcc-vax-libbz2 137 mdate 27 Jun 2002 138 who thorpej 139 file lib/libbz2/Makefile 140 descr 141 libbz2 is mis-compiled with optimization with GCC 2.95.3 142 on VAX. -O0 works around this problem. 143 kcah 144 145 hack gawk 146 mdate 8 Nov 2003 147 who ragge 148 file gnu/usr.bin/gawk/Makefile 149 descr 150 gawk is mis-compiled with optimization with GCC 2.95.3 151 on VAX. -O0 works around this problem. 152 kcah 153 154 hack vax Toolchain bug 155 cdate 28 Mar 2003 156 who he 157 file sys/arch/vax/vax/intvec.S : 1.5 158 descr 159 Workaround for PR toolchain/20924. The assembler apparently 160 tries to range-check byte offsets when it doesn't have 161 sufficient information to make that decision. 162 Workaround uses `brw' instead of `brb' instruction. 163 kcah 164 165 hack vax gcc 2.95.3 -Wuninitialized workarounds 166 cdate 6 Nov 2003 167 who he 168 file sys/dev/bi/if_ni.c : 1.22 169 file sys/arch/vax/vax/ctu.c : 1.20 170 descr 171 Workaround for gcc 2.95.3 failing to detect that certain 172 variables will be initialized; so that this code compiles 173 with -Wuninitialized. Should be reviewed and possibly 174 reverted when gcc 3.3.2 is ready for vax. 175 kcah 176 177 hack vax gcc 2.95.3 structure initialization 178 cdat 13 May 2004 179 who cl 180 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 181 descr 182 Workaround for gcc 2.95.3 failing to initialize structures 183 and/or unions inside structures using nested designators. 184 Should be reverted when gcc >=3.3.3 is ready for vax. 185 kcah 186 187 hack vax gcc 2.95.3 needs -I. to build nslexer.c 188 cdat 6 Jun 2004 189 who mhitch 190 file lib/libc/arch/vax/Makefile.inc : 1.6 191 descr 192 It appears necessary to add -I. to CPPFLAGS when building 193 nslesxer.c. This may be caused by gcc 2.95.3 being used. 194 Should be reverted when a newer gcc is ready for vax. 195 kcah 196 197 port sparc64 198 199 hack binutil-2.11-sparc64-pltrela 200 mdate 14 Aug 2001 201 who eeh 202 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 203 descr 204 The first four PLT entries are reserved. There is some 205 disagreement whether they should have associated relocation 206 entries. Both the SPARC 32-bit and 64-bit ELF specifications 207 say that they should have relocation entries, but the 32-bit 208 SPARC binutils do not generate them, and now the 64-bit SPARC 209 binutils have stopped generating them too. 210 211 To provide binary compatibility, we will check the first entry, 212 if it is reserved it should not be of the type JMP_SLOT. If it 213 is JMP_SLOT, then the 4 reserved entries were not generated and 214 our index is 4 entries too far, so we frob the rela pointer. 215 kcah 216 217 218 port arm 219 220 hack gcc-unsigned-compare 221 cdate 09 Mar 2002 222 mdate 18 Mar 2002 223 who bjh21 224 file dist/bind/lib/nameser/ns_parse.c : 1.3 225 file dist/dhcp/minires/ns_parse.c : 1.3 226 file dist/dhcp/omapip/result.c : 1.2 227 file dist/dhcp/server/failover.c : 1.3 228 file gnu/dist/gawk/eval.c : 1.4 229 file gnu/dist/toolchain/bfd/bfd.c : 1.2 230 file gnu/dist/toolchain/bfd/format.c : 1.2 231 file gnu/dist/toolchain/gdb/target.c : 1.2 232 file sys/kern/vfs_subr.c : 1.172 233 descr When checking that a potentially-unsigned enum is >= 0, assign 234 it to an int first. This is necessary to avoid "comparison is 235 always true" warnings with -fshort-enums. Casting to an int 236 really should be enough, but turns out not to be. 237 kcah 238 239 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 240 cdate Tue Oct 28 18:02:16 GMT 2003 241 who skrll 242 pr 23044 243 file sys/arch/arm/conf/Makefile.arm : 1.19 244 descr 245 Performing a build.sh tools on a CATS with NFS mounted 246 obj and src directories results in "panic: receive 1" 247 The hack is to compile sys/kern/uipc_socket.c with 248 -fno-strict-aliasing 249 kcah 250 251 252 port pc532 253 254 hack egcs-pc532-ip6_mroute 255 cdate 09 Jul 2002 256 who simonb 257 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 258 file sys/arch/pc532/conf/files.pc532 : 1.47 259 descr 260 egcs 1.1.2 gets an "internal error--insn does not satisfy its 261 constraints" error compiling ip6_mroute.c with -O2 or greater. 262 -O1 works around this problem. 263 kcah 264 265 hack gcc-pc532-duffs_device 266 cdate Mon Oct 27 07:23:05 UTC 2003 267 who simonb 268 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 269 file sys/arch/pc532/conf/files.pc532 : 1.52 270 pr GCC PR optimization/5230 271 descr 272 gcc incorrectly gives an "unreachable code at beginning of 273 switch statement" for a Duff's device construct in 274 arch/pc532/dev/ncr.c. There is no way to disable just this 275 warning, so -Wno-error is turned on for this file. 276 kcah 277 278 hack gcc332-cppmacro-ice 279 cdate Sun Dec 7 12:48:33 UTC 2003 280 who simonb 281 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 282 descr 283 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 284 The hack is to use -O1 for this file. Fixed in gcc 285 -current mainline, unable to work out where the fix is 286 right now. 287 kcah 288 289 290 port sh3 291 292 hack gcc-sh3-sed 293 mdate 23 Apr 2002 294 who thorpej 295 file usr.bin/sed/Makefile : 1.9 : 9 : 13 296 descr 297 The in-tree GCC 2.95.3-based compiler ICEs when building 298 with optimization for SuperH. Hack is to build with -O0. 299 kcah 300 301 302 port sh5 303 304 hack SuperH SH5 Toolchain Bugs 305 cdate 11 Jul 2002 306 who scw 307 file usr.sbin/ndbootd/ndbootd.c : 1.6 308 file usr.sbin/traceroute/traceroute.c : 1.48 309 descr 310 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 311 compiler error when assigning a bit-wise inverted value 312 under some circumstances. 313 Work around it by splitting the statement into two. 314 kcah 315 316 hack SuperH SH5 Toolchain Bugs 317 cdate 17 May 2003 318 who scw 319 file lib/libpthread/pthread_lock.c : 1.7 320 descr 321 The SuperH SH5 toolchain generates incorrect PIC code when 322 faced with a symbol which is declared extern, but has local 323 scope due to being defined within an asm() statement (without 324 being declared .globl in that statement). Work around it by 325 adding the .globl. 326 kcah 327 328 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 329 cdate Sun Dec 7 19:44:05 GMT 2003 330 who scw 331 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 332 descr 333 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 334 Drop to -O1 for now when building for sh5. 335 kcah 336 337 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 338 cdate Sun Dec 7 21:10:46 GMT 2003 339 who scw 340 file gnu/lib/libbfd/Makefile : 1.39 341 descr 342 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 343 and elf64.c at -O2. 344 Drop to -O1 for now when building for sh5. 345 kcah 346 347 348 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 349 cdate Sun Dec 7 19:44:05 GMT 2003 350 who scw 351 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 352 descr 353 Gcc3 for sh5 issues a warning: 354 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 355 mutually exclusive equal-tests is always 0. 356 This causes the build to fail because of -Werror. 357 Work-around by defining NOGCCERROR when building for sh5. 358 kcah 359 360 hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c 361 cdate Thu Nov 11 00:35:33 UTC 2004 362 who he 363 file usr.sbin/bind/libdns/Makefile/1.2 364 descr 365 Gcc3 for sh5 gets an ICE compiling these files at -O2. 366 Drop to -O1 for now when building for sh5. 367 kcah 368 369 370 port sun2 371 372 hack gcc 3.3.2/mdsetimage 373 cdate Tue Oct 28 18:43:05 EST 2003 374 who fredette 375 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 376 descr 377 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 378 this hack uses -O0 to avoid the problem. 379 kcah 380 381 hack gcc 3.3.2/installboot/ffs.c 382 cdate Tue Oct 28 18:43:05 EST 2003 383 who fredette 384 file usr.sbin/installboot/Makefile : 1.26 385 descr 386 ffs.c causes cc1 to barf for as-yet unknown reasons. this 387 hack uses -O0 to avoid the problem. 388 kcah 389 390 391 port sun2, m68k 392 393 hack gcc 3.3.2/gcc/ra-colorize.c 394 cdate Wed Nov 5 11:03:13 EST 2003 395 who mrg 396 file gnu/usr.bin/gcc/backend/Makefile : 1.11 397 descr 398 ra-colorize.c causes a whole spew of unreferenced .L* local 399 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 400 kcah 401 402 port sparc64 403 404 hack disable optimzations for uvm_bio.c on 32 bit kernels 405 cdate Sun Mar 21 14:14:04 MET 2004 406 who martin 407 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 408 file sys/arch/sparc64/conf/files.sparc64 : 1.93 409 descr 410 The sparc compiler miscompiles uvm_bio.c when using 411 any optimization. This results in ubc_release panics. 412 kcah 413 414 port macppc 415 416 hack remove inline from rotate_{left,right} 417 cdate Tue Feb 22 13:43:25 EST 2005 418 who christos 419 file src/dist/bind/lib/dns/rbt.c 420 descr 421 The macppc gcc-3.3 compiler miscompiles rbt.c when these 422 functions are inlined. The error is: 423 .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed 424 .* named[368]: exiting (due to assertion failure) 425 This is reportedly fixed in gcc-3.4 426 kcah 427
Indexes created Wed Nov 05 22:09:55 GMT 2025