HACKS revision 1.32.2.3
1 # $NetBSD: HACKS,v 1.32.2.3 2004/08/11 19:52:10 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 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 port sparc64 177 178 hack binutil-2.11-sparc64-pltrela 179 mdate 14 Aug 2001 180 who eeh 181 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 182 descr 183 The first for PLT entries are reserved. There is some 184 disagreement whether they should have associated relocation 185 entries. Both the SPARC 32-bit and 64-bit ELF specifications 186 say that they should have relocation entries, but the 32-bit 187 SPARC binutils do not generate them, and now the 64-bit SPARC 188 binutils have stopped generating them too. 189 190 To provide binary compatibility, we will check the first entry, 191 if it is reserved it should not be of the type JMP_SLOT. If it 192 is JMP_SLOT, then the 4 reserved entries were not generated and 193 our index is 4 entries too far, so we frob the rela pointer. 194 kcah 195 196 197 port arm 198 199 hack gcc-unsigned-compare 200 cdate 09 Mar 2002 201 mdate 18 Mar 2002 202 who bjh21 203 file dist/bind/lib/nameser/ns_parse.c : 1.3 204 file dist/dhcp/minires/ns_parse.c : 1.3 205 file dist/dhcp/omapip/result.c : 1.2 206 file dist/dhcp/server/failover.c : 1.3 207 file gnu/dist/gawk/eval.c : 1.4 208 file gnu/dist/toolchain/bfd/bfd.c : 1.2 209 file gnu/dist/toolchain/bfd/format.c : 1.2 210 file gnu/dist/toolchain/gdb/target.c : 1.2 211 file sys/kern/vfs_subr.c : 1.172 212 descr When checking that a potentially-unsigned enum is >= 0, assign 213 it to an int first. This is necessary to avoid "comparison is 214 always true" warnings with -fshort-enums. Casting to an int 215 really should be enough, but turns out not to be. 216 kcah 217 218 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 219 cdate Tue Oct 28 18:02:16 GMT 2003 220 who skrll 221 file sys/conf/arm/Makefile.arm : 1.19 222 descr 223 Performing a build.sh tools on a CATS with NFS mounted 224 obj and src directories results in "panic: receive 1" 225 The hack is to compile sys/kern/uipc_socket.c with 226 -fno-strict-aliasing 227 kcah 228 229 230 port pc532 231 232 hack egcs-pc532-ip6_mroute 233 cdate 09 Jul 2002 234 who simonb 235 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 236 file sys/arch/pc532/conf/files.pc532 : 1.47 237 descr 238 egcs 1.1.2 gets an "internal error--insn does not satisfy its 239 constraints" error compiling ip6_mroute.c with -O2 or greater. 240 -O1 works around this problem. 241 kcah 242 243 hack gcc-pc532-duffs_device 244 cdate Mon Oct 27 07:23:05 UTC 2003 245 who simonb 246 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 247 file sys/arch/pc532/conf/files.pc532 : 1.52 248 pr GCC PR optimization/5230 249 descr 250 gcc incorrectly gives an "unreachable code at beginning of 251 switch statement" for a Duff's device construct in 252 arch/pc532/dev/ncr.c. There is no way to disable just this 253 warning, so -Wno-error is turned on for this file. 254 kcah 255 256 hack gcc332-cppmacro-ice 257 cdate Sun Dec 7 12:48:33 UTC 2003 258 who simonb 259 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 260 descr 261 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 262 The hack is to use -O1 for this file. Fixed in gcc 263 -current mainline, unable to work out where the fix is 264 right now. 265 kcah 266 267 268 port sh3 269 270 hack gcc-sh3-sed 271 mdate 23 Apr 2002 272 who thorpej 273 file usr.bin/sed/Makefile : 1.9 : 9 : 13 274 descr 275 The in-tree GCC 2.95.3-based compiler ICEs when building 276 with optimization for SuperH. Hack is to build with -O0. 277 kcah 278 279 280 port sh5 281 282 hack SuperH SH5 Toolchain Bugs 283 cdate 11 Jul 2002 284 who scw 285 file usr.sbin/ndbootd/ndbootd.c : 1.6 286 file usr.sbin/traceroute/traceroute.c : 1.48 287 descr 288 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 289 compiler error when assigning a bit-wise inverted value 290 under some circumstances. 291 Work around it by splitting the statement into two. 292 kcah 293 294 hack SuperH SH5 Toolchain Bugs 295 cdate 17 May 2003 296 who scw 297 file lib/libpthread/pthread_lock.c : 1.7 298 descr 299 The SuperH SH5 toolchain generates incorrect PIC code when 300 faced with a symbol which is declared extern, but has local 301 scope due to being defined within an asm() statement (without 302 being declared .globl in that statement). Work around it by 303 adding the .globl. 304 kcah 305 306 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 307 cdate Sun Dec 7 19:44:05 GMT 2003 308 who scw 309 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 310 descr 311 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 312 Drop to -O1 for now when building for sh5. 313 kcah 314 315 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 316 cdate Sun Dec 7 21:10:46 GMT 2003 317 who scw 318 file gnu/lib/libbfd/Makefile : 1.39 319 descr 320 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 321 and elf64.c at -O2. 322 Drop to -O1 for now when building for sh5. 323 kcah 324 325 326 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 327 cdate Sun Dec 7 19:44:05 GMT 2003 328 who scw 329 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 330 descr 331 Gcc3 for sh5 issues a warning: 332 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 333 mutually exclusive equal-tests is always 0. 334 This causes the build to fail because of -Werror. 335 Work-around by defining NOGCCERROR when building for sh5. 336 kcah 337 338 hack gcc 3.3.2 on sh5 - ICE compiling dist/bind/bin/named/ns_main.c 339 cdate Sun Dec 7 19:44:05 GMT 2003 340 who scw 341 file usr.sbin/bind/named/Makefile : 1.15 342 descr 343 Gcc3 for sh5 gets an ICE compiling ns_main.c at -O2. 344 Drop to -O1 for now when building for sh5. 345 kcah 346 347 348 port sun2 349 350 hack gcc 3.3.2/mdsetimage 351 cdate Tue Oct 28 18:43:05 EST 2003 352 who fredette 353 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 354 descr 355 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 356 this hack uses -O0 to avoid the problem. 357 kcah 358 359 hack gcc 3.3.2/installboot/ffs.c 360 cdate Tue Oct 28 18:43:05 EST 2003 361 who fredette 362 file usr.sbin/installboot/Makefile : 1.26 363 descr 364 ffs.c causes cc1 to barf for as-yet unknown reasons. this 365 hack uses -O0 to avoid the problem. 366 kcah 367 368 369 port sun2, m68k 370 371 hack gcc 3.3.2/gcc/ra-colorize.c 372 cdate Wed Nov 5 11:03:13 EST 2003 373 who mrg 374 file gnu/usr.bin/gcc/backend/Makefile : 1.11 375 descr 376 ra-colorize.c causes a whole spew of unreferenced .L* local 377 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 378 kcah 379 380 port sparc64 381 382 hack disable optimzations for uvm_bio.c on 32 bit kernels 383 cdate Sun Mar 21 14:14:04 MET 2004 384 who martin 385 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 386 file sys/arch/sparc64/conf/files.sparc64 : 1.93 387 descr 388 The sparc compiler miscompiles uvm_bio.c when using 389 any optimization. This results in ubc_release panics. 390 kcah 391
Indexes created Wed Nov 05 21:10:10 GMT 2025