HACKS revision 1.34
1 # $NetBSD: HACKS,v 1.34 2004/05/13 15:44:04 cl 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 99 100 port vax 101 102 hack gcc 2.95/vax cannot handle __builtin_ffs() 103 cdate Fri Aug 23 21:31:15 CEST 2002 104 who ragge 105 file sys/lib/libkern/libkern.h : 1.42 106 descr 107 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 108 added this feature to GCC 3 so it can be removed when switching. 109 kcah 110 111 hack gcc-vax-libbz2 112 mdate 27 Jun 2002 113 who thorpej 114 file lib/libbz2/Makefile 115 descr 116 libbz2 is mis-compiled with optimization with GCC 2.95.3 117 on VAX. -O0 works around this problem. 118 kcah 119 120 hack gawk 121 mdate 8 Nov 2003 122 who ragge 123 file gnu/usr.bin/gawk/Makefile 124 descr 125 gawk is mis-compiled with optimization with GCC 2.95.3 126 on VAX. -O0 works around this problem. 127 kcah 128 129 hack vax Toolchain bug 130 cdate 28 Mar 2003 131 who he 132 file sys/arch/vax/vax/intvec.S : 1.5 133 descr 134 Workaround for PR toolchain/20924. The assembler apparently 135 tries to range-check byte offsets when it doesn't have 136 sufficient information to make that decision. 137 Workaround uses `brw' instead of `brb' instruction. 138 kcah 139 140 hack vax gcc 2.95.3 -Wuninitialized workarounds 141 cdate 6 Nov 2003 142 who he 143 file sys/dev/bi/if_ni.c : 1.22 144 file sys/arch/vax/vax/ctu.c : 1.20 145 descr 146 Workaround for gcc 2.95.3 failing to detect that certain 147 variables will be initialized; so that this code compiles 148 with -Wuninitialized. Should be reviewed and possibly 149 reverted when gcc 3.3.2 is ready for vax. 150 kcah 151 152 hack vax gcc 2.95.3 structure initialization 153 cdat 13 May 2004 154 who cl 155 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 156 descr 157 Workaround for gcc 2.95.3 failing to initialize structures 158 and/or unions inside structures using nested designators. 159 Should be reverted when gcc >=3.3.3 is ready for vax. 160 kcah 161 162 port sparc64 163 164 hack binutil-2.11-sparc64-pltrela 165 mdate 14 Aug 2001 166 who eeh 167 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 168 descr 169 The first for PLT entries are reserved. There is some 170 disagreement whether they should have associated relocation 171 entries. Both the SPARC 32-bit and 64-bit ELF specifications 172 say that they should have relocation entries, but the 32-bit 173 SPARC binutils do not generate them, and now the 64-bit SPARC 174 binutils have stopped generating them too. 175 176 To provide binary compatibility, we will check the first entry, 177 if it is reserved it should not be of the type JMP_SLOT. If it 178 is JMP_SLOT, then the 4 reserved entries were not generated and 179 our index is 4 entries too far, so we frob the rela pointer. 180 kcah 181 182 183 port arm 184 185 hack gcc-unsigned-compare 186 cdate 09 Mar 2002 187 mdate 18 Mar 2002 188 who bjh21 189 file dist/bind/lib/nameser/ns_parse.c : 1.3 190 file dist/dhcp/minires/ns_parse.c : 1.3 191 file dist/dhcp/omapip/result.c : 1.2 192 file dist/dhcp/server/failover.c : 1.3 193 file gnu/dist/gawk/eval.c : 1.4 194 file gnu/dist/toolchain/bfd/bfd.c : 1.2 195 file gnu/dist/toolchain/bfd/format.c : 1.2 196 file gnu/dist/toolchain/gdb/target.c : 1.2 197 file sys/kern/vfs_subr.c : 1.172 198 descr When checking that a potentially-unsigned enum is >= 0, assign 199 it to an int first. This is necessary to avoid "comparison is 200 always true" warnings with -fshort-enums. Casting to an int 201 really should be enough, but turns out not to be. 202 kcah 203 204 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 205 cdate Tue Oct 28 18:02:16 GMT 2003 206 who skrll 207 file sys/conf/arm/Makefile.arm : 1.19 208 descr 209 Performing a build.sh tools on a CATS with NFS mounted 210 obj and src directories results in "panic: receive 1" 211 The hack is to compile sys/kern/uipc_socket.c with 212 -fno-strict-aliasing 213 kcah 214 215 216 port pc532 217 218 hack egcs-pc532-ip6_mroute 219 cdate 09 Jul 2002 220 who simonb 221 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 222 file sys/arch/pc532/conf/files.pc532 : 1.47 223 descr 224 egcs 1.1.2 gets an "internal error--insn does not satisfy its 225 constraints" error compiling ip6_mroute.c with -O2 or greater. 226 -O1 works around this problem. 227 kcah 228 229 hack gcc-pc532-duffs_device 230 cdate Mon Oct 27 07:23:05 UTC 2003 231 who simonb 232 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 233 file sys/arch/pc532/conf/files.pc532 : 1.52 234 pr GCC PR optimization/5230 235 descr 236 gcc incorrectly gives an "unreachable code at beginning of 237 switch statement" for a Duff's device construct in 238 arch/pc532/dev/ncr.c. There is no way to disable just this 239 warning, so -Wno-error is turned on for this file. 240 kcah 241 242 hack gcc332-cppmacro-ice 243 cdate Sun Dec 7 12:48:33 UTC 2003 244 who simonb 245 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 246 descr 247 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 248 The hack is to use -O1 for this file. Fixed in gcc 249 -current mainline, unable to work out where the fix is 250 right now. 251 kcah 252 253 254 port sh3 255 256 hack gcc-sh3-sed 257 mdate 23 Apr 2002 258 who thorpej 259 file usr.bin/sed/Makefile : 1.9 : 9 : 13 260 descr 261 The in-tree GCC 2.95.3-based compiler ICEs when building 262 with optimization for SuperH. Hack is to build with -O0. 263 kcah 264 265 266 port sh5 267 268 hack SuperH SH5 Toolchain Bugs 269 cdate 11 Jul 2002 270 who scw 271 file usr.sbin/ndbootd/ndbootd.c : 1.6 272 file usr.sbin/traceroute/traceroute.c : 1.48 273 descr 274 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 275 compiler error when assigning a bit-wise inverted value 276 under some circumstances. 277 Work around it by splitting the statement into two. 278 kcah 279 280 hack SuperH SH5 Toolchain Bugs 281 cdate 17 May 2003 282 who scw 283 file lib/libpthread/pthread_lock.c : 1.7 284 descr 285 The SuperH SH5 toolchain generates incorrect PIC code when 286 faced with a symbol which is declared extern, but has local 287 scope due to being defined within an asm() statement (without 288 being declared .globl in that statement). Work around it by 289 adding the .globl. 290 kcah 291 292 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 293 cdate Sun Dec 7 19:44:05 GMT 2003 294 who scw 295 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 296 descr 297 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 298 Drop to -O1 for now when building for sh5. 299 kcah 300 301 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 302 cdate Sun Dec 7 21:10:46 GMT 2003 303 who scw 304 file gnu/lib/libbfd/Makefile : 1.39 305 descr 306 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 307 and elf64.c at -O2. 308 Drop to -O1 for now when building for sh5. 309 kcah 310 311 312 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 313 cdate Sun Dec 7 19:44:05 GMT 2003 314 who scw 315 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 316 descr 317 Gcc3 for sh5 issues a warning: 318 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 319 mutually exclusive equal-tests is always 0. 320 This causes the build to fail because of -Werror. 321 Work-around by defining NOGCCERROR when building for sh5. 322 kcah 323 324 hack gcc 3.3.2 on sh5 - ICE compiling dist/bind/bin/named/ns_main.c 325 cdate Sun Dec 7 19:44:05 GMT 2003 326 who scw 327 file usr.sbin/bind/named/Makefile : 1.15 328 descr 329 Gcc3 for sh5 gets an ICE compiling ns_main.c at -O2. 330 Drop to -O1 for now when building for sh5. 331 kcah 332 333 334 port sun2 335 336 hack gcc 3.3.2/mdsetimage 337 cdate Tue Oct 28 18:43:05 EST 2003 338 who fredette 339 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 340 descr 341 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 342 this hack uses -O0 to avoid the problem. 343 kcah 344 345 hack gcc 3.3.2/installboot/ffs.c 346 cdate Tue Oct 28 18:43:05 EST 2003 347 who fredette 348 file usr.sbin/installboot/Makefile : 1.26 349 descr 350 ffs.c causes cc1 to barf for as-yet unknown reasons. this 351 hack uses -O0 to avoid the problem. 352 kcah 353 354 355 port sun2, m68k 356 357 hack gcc 3.3.2/gcc/ra-colorize.c 358 cdate Wed Nov 5 11:03:13 EST 2003 359 who mrg 360 file gnu/usr.bin/gcc/backend/Makefile : 1.11 361 descr 362 ra-colorize.c causes a whole spew of unreferenced .L* local 363 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 364 kcah 365 366 port sparc64 367 368 hack disable optimzations for uvm_bio.c on 32 bit kernels 369 cdate Sun Mar 21 14:14:04 MET 2004 370 who martin 371 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 372 file sys/arch/sparc64/conf/files.sparc64 : 1.93 373 descr 374 The sparc compiler miscompiles uvm_bio.c when using 375 any optimization. This results in ubc_release panics. 376 kcah 377
Indexes created Wed Nov 05 21:10:10 GMT 2025