HACKS revision 1.37
1 # $NetBSD: HACKS,v 1.37 2004/08/06 03:37:55 junyoung 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 invalid use of type casting in the code and not a compiler 109 bug. Once a new release of KAME with a proper fix applied is imported 110 this should be backed out. 111 kcah 112 113 114 port vax 115 116 hack gcc 2.95/vax cannot handle __builtin_ffs() 117 cdate Fri Aug 23 21:31:15 CEST 2002 118 who ragge 119 file sys/lib/libkern/libkern.h : 1.42 120 descr 121 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 122 added this feature to GCC 3 so it can be removed when switching. 123 kcah 124 125 hack gcc-vax-libbz2 126 mdate 27 Jun 2002 127 who thorpej 128 file lib/libbz2/Makefile 129 descr 130 libbz2 is mis-compiled with optimization with GCC 2.95.3 131 on VAX. -O0 works around this problem. 132 kcah 133 134 hack gawk 135 mdate 8 Nov 2003 136 who ragge 137 file gnu/usr.bin/gawk/Makefile 138 descr 139 gawk is mis-compiled with optimization with GCC 2.95.3 140 on VAX. -O0 works around this problem. 141 kcah 142 143 hack vax Toolchain bug 144 cdate 28 Mar 2003 145 who he 146 file sys/arch/vax/vax/intvec.S : 1.5 147 descr 148 Workaround for PR toolchain/20924. The assembler apparently 149 tries to range-check byte offsets when it doesn't have 150 sufficient information to make that decision. 151 Workaround uses `brw' instead of `brb' instruction. 152 kcah 153 154 hack vax gcc 2.95.3 -Wuninitialized workarounds 155 cdate 6 Nov 2003 156 who he 157 file sys/dev/bi/if_ni.c : 1.22 158 file sys/arch/vax/vax/ctu.c : 1.20 159 descr 160 Workaround for gcc 2.95.3 failing to detect that certain 161 variables will be initialized; so that this code compiles 162 with -Wuninitialized. Should be reviewed and possibly 163 reverted when gcc 3.3.2 is ready for vax. 164 kcah 165 166 hack vax gcc 2.95.3 structure initialization 167 cdat 13 May 2004 168 who cl 169 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 170 descr 171 Workaround for gcc 2.95.3 failing to initialize structures 172 and/or unions inside structures using nested designators. 173 Should be reverted when gcc >=3.3.3 is ready for vax. 174 kcah 175 176 hack vax gcc 2.95.3 needs -I. to build nslexer.c 177 cdat 6 Jun 2004 178 who mhitch 179 file lib/libc/arch/vax/Makefile.inc : 1.6 180 descr 181 It appears necessary to add -I. to CPPFLAGS when building 182 nslesxer.c. This may be caused by gcc 2.95.3 being used. 183 Should be reverted when a newer gcc is ready for vax. 184 kcah 185 186 port sparc64 187 188 hack binutil-2.11-sparc64-pltrela 189 mdate 14 Aug 2001 190 who eeh 191 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 192 descr 193 The first for PLT entries are reserved. There is some 194 disagreement whether they should have associated relocation 195 entries. Both the SPARC 32-bit and 64-bit ELF specifications 196 say that they should have relocation entries, but the 32-bit 197 SPARC binutils do not generate them, and now the 64-bit SPARC 198 binutils have stopped generating them too. 199 200 To provide binary compatibility, we will check the first entry, 201 if it is reserved it should not be of the type JMP_SLOT. If it 202 is JMP_SLOT, then the 4 reserved entries were not generated and 203 our index is 4 entries too far, so we frob the rela pointer. 204 kcah 205 206 207 port arm 208 209 hack gcc-unsigned-compare 210 cdate 09 Mar 2002 211 mdate 18 Mar 2002 212 who bjh21 213 file dist/bind/lib/nameser/ns_parse.c : 1.3 214 file dist/dhcp/minires/ns_parse.c : 1.3 215 file dist/dhcp/omapip/result.c : 1.2 216 file dist/dhcp/server/failover.c : 1.3 217 file gnu/dist/gawk/eval.c : 1.4 218 file gnu/dist/toolchain/bfd/bfd.c : 1.2 219 file gnu/dist/toolchain/bfd/format.c : 1.2 220 file gnu/dist/toolchain/gdb/target.c : 1.2 221 file sys/kern/vfs_subr.c : 1.172 222 descr When checking that a potentially-unsigned enum is >= 0, assign 223 it to an int first. This is necessary to avoid "comparison is 224 always true" warnings with -fshort-enums. Casting to an int 225 really should be enough, but turns out not to be. 226 kcah 227 228 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 229 cdate Tue Oct 28 18:02:16 GMT 2003 230 who skrll 231 file sys/conf/arm/Makefile.arm : 1.19 232 descr 233 Performing a build.sh tools on a CATS with NFS mounted 234 obj and src directories results in "panic: receive 1" 235 The hack is to compile sys/kern/uipc_socket.c with 236 -fno-strict-aliasing 237 kcah 238 239 240 port pc532 241 242 hack egcs-pc532-ip6_mroute 243 cdate 09 Jul 2002 244 who simonb 245 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 246 file sys/arch/pc532/conf/files.pc532 : 1.47 247 descr 248 egcs 1.1.2 gets an "internal error--insn does not satisfy its 249 constraints" error compiling ip6_mroute.c with -O2 or greater. 250 -O1 works around this problem. 251 kcah 252 253 hack gcc-pc532-duffs_device 254 cdate Mon Oct 27 07:23:05 UTC 2003 255 who simonb 256 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 257 file sys/arch/pc532/conf/files.pc532 : 1.52 258 pr GCC PR optimization/5230 259 descr 260 gcc incorrectly gives an "unreachable code at beginning of 261 switch statement" for a Duff's device construct in 262 arch/pc532/dev/ncr.c. There is no way to disable just this 263 warning, so -Wno-error is turned on for this file. 264 kcah 265 266 hack gcc332-cppmacro-ice 267 cdate Sun Dec 7 12:48:33 UTC 2003 268 who simonb 269 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 270 descr 271 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 272 The hack is to use -O1 for this file. Fixed in gcc 273 -current mainline, unable to work out where the fix is 274 right now. 275 kcah 276 277 278 port sh3 279 280 hack gcc-sh3-sed 281 mdate 23 Apr 2002 282 who thorpej 283 file usr.bin/sed/Makefile : 1.9 : 9 : 13 284 descr 285 The in-tree GCC 2.95.3-based compiler ICEs when building 286 with optimization for SuperH. Hack is to build with -O0. 287 kcah 288 289 290 port sh5 291 292 hack SuperH SH5 Toolchain Bugs 293 cdate 11 Jul 2002 294 who scw 295 file usr.sbin/ndbootd/ndbootd.c : 1.6 296 file usr.sbin/traceroute/traceroute.c : 1.48 297 descr 298 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 299 compiler error when assigning a bit-wise inverted value 300 under some circumstances. 301 Work around it by splitting the statement into two. 302 kcah 303 304 hack SuperH SH5 Toolchain Bugs 305 cdate 17 May 2003 306 who scw 307 file lib/libpthread/pthread_lock.c : 1.7 308 descr 309 The SuperH SH5 toolchain generates incorrect PIC code when 310 faced with a symbol which is declared extern, but has local 311 scope due to being defined within an asm() statement (without 312 being declared .globl in that statement). Work around it by 313 adding the .globl. 314 kcah 315 316 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 317 cdate Sun Dec 7 19:44:05 GMT 2003 318 who scw 319 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 320 descr 321 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 322 Drop to -O1 for now when building for sh5. 323 kcah 324 325 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 326 cdate Sun Dec 7 21:10:46 GMT 2003 327 who scw 328 file gnu/lib/libbfd/Makefile : 1.39 329 descr 330 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 331 and elf64.c at -O2. 332 Drop to -O1 for now when building for sh5. 333 kcah 334 335 336 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 337 cdate Sun Dec 7 19:44:05 GMT 2003 338 who scw 339 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 340 descr 341 Gcc3 for sh5 issues a warning: 342 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 343 mutually exclusive equal-tests is always 0. 344 This causes the build to fail because of -Werror. 345 Work-around by defining NOGCCERROR when building for sh5. 346 kcah 347 348 hack gcc 3.3.2 on sh5 - ICE compiling dist/bind/bin/named/ns_main.c 349 cdate Sun Dec 7 19:44:05 GMT 2003 350 who scw 351 file usr.sbin/bind/named/Makefile : 1.15 352 descr 353 Gcc3 for sh5 gets an ICE compiling ns_main.c at -O2. 354 Drop to -O1 for now when building for sh5. 355 kcah 356 357 358 port sun2 359 360 hack gcc 3.3.2/mdsetimage 361 cdate Tue Oct 28 18:43:05 EST 2003 362 who fredette 363 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 364 descr 365 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 366 this hack uses -O0 to avoid the problem. 367 kcah 368 369 hack gcc 3.3.2/installboot/ffs.c 370 cdate Tue Oct 28 18:43:05 EST 2003 371 who fredette 372 file usr.sbin/installboot/Makefile : 1.26 373 descr 374 ffs.c causes cc1 to barf for as-yet unknown reasons. this 375 hack uses -O0 to avoid the problem. 376 kcah 377 378 379 port sun2, m68k 380 381 hack gcc 3.3.2/gcc/ra-colorize.c 382 cdate Wed Nov 5 11:03:13 EST 2003 383 who mrg 384 file gnu/usr.bin/gcc/backend/Makefile : 1.11 385 descr 386 ra-colorize.c causes a whole spew of unreferenced .L* local 387 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 388 kcah 389 390 port sparc64 391 392 hack disable optimzations for uvm_bio.c on 32 bit kernels 393 cdate Sun Mar 21 14:14:04 MET 2004 394 who martin 395 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 396 file sys/arch/sparc64/conf/files.sparc64 : 1.93 397 descr 398 The sparc compiler miscompiles uvm_bio.c when using 399 any optimization. This results in ubc_release panics. 400 kcah 401
Indexes created Wed Nov 05 19:10:08 GMT 2025