HACKS revision 1.26
1 # $NetBSD: HACKS,v 1.26 2003/12/07 12:52:33 simonb 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 151 152 153 port sparc64 154 155 hack binutil-2.11-sparc64-pltrela 156 mdate 14 Aug 2001 157 who eeh 158 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 159 descr 160 The first for PLT entries are reserved. There is some 161 disagreement whether they should have associated relocation 162 entries. Both the SPARC 32-bit and 64-bit ELF specifications 163 say that they should have relocation entries, but the 32-bit 164 SPARC binutils do not generate them, and now the 64-bit SPARC 165 binutils have stopped generating them too. 166 167 To provide binary compatibility, we will check the first entry, 168 if it is reserved it should not be of the type JMP_SLOT. If it 169 is JMP_SLOT, then the 4 reserved entries were not generated and 170 our index is 4 entries too far, so we frob the rela pointer. 171 kcah 172 173 174 port arm 175 176 hack gcc-unsigned-compare 177 cdate 09 Mar 2002 178 mdate 18 Mar 2002 179 who bjh21 180 file dist/bind/lib/nameser/ns_parse.c : 1.3 181 file dist/dhcp/minires/ns_parse.c : 1.3 182 file dist/dhcp/omapip/result.c : 1.2 183 file dist/dhcp/server/failover.c : 1.3 184 file gnu/dist/gawk/eval.c : 1.4 185 file gnu/dist/toolchain/bfd/bfd.c : 1.2 186 file gnu/dist/toolchain/bfd/format.c : 1.2 187 file gnu/dist/toolchain/gdb/target.c : 1.2 188 file sys/kern/vfs_subr.c : 1.172 189 descr When checking that a potentially-unsigned enum is >= 0, assign 190 it to an int first. This is necessary to avoid "comparison is 191 always true" warnings with -fshort-enums. Casting to an int 192 really should be enough, but turns out not to be. 193 kcah 194 195 hack gcc 3.3.x bug 196 cdate Sun Oct 26 01:50:16 UTC 2003 197 who lukem 198 file usr.bin/newsyslog/newsyslog.c 199 pr 22986 23002 23217 200 descr 201 newsyslog fails with 202 newsyslog: config line 7: bad flags 203 solved when compiled with -fno-gcse-lm 204 kcah 205 206 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 207 cdate Tue Oct 28 18:02:16 GMT 2003 208 who skrll 209 file sys/conf/arm/Makefile.arm : 1.19 210 descr 211 Performing a build.sh tools on a CATS with NFS mounted 212 obj and src directories results in "panic: receive 1" 213 The hack is to compile sys/kern/uipc_socket.c with 214 -fno-strict-aliasing 215 kcah 216 217 218 port pc532 219 220 hack egcs-pc532-ip6_mroute 221 cdate 09 Jul 2002 222 who simonb 223 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 224 file sys/arch/pc532/conf/files.pc532 : 1.47 225 descr 226 egcs 1.1.2 gets an "internal error--insn does not satisfy its 227 constraints" error compiling ip6_mroute.c with -O2 or greater. 228 -O1 works around this problem. 229 kcah 230 231 hack gcc-pc532-duffs_device 232 cdate Mon Oct 27 07:23:05 UTC 2003 233 who simonb 234 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 235 file sys/arch/pc532/conf/files.pc532 : 1.52 236 pr GCC PR optimization/5230 237 descr 238 gcc incorrectly gives an "unreachable code at beginning of 239 switch statement" for a Duff's device construct in 240 arch/pc532/dev/ncr.c. There is no way to disable just this 241 warning, so -Wno-error is turned on for this file. 242 kcah 243 244 hack gcc332-cppmacro-ice 245 cdate Sun Dec 7 12:48:33 UTC 2003 246 who simonb 247 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 248 descr 249 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 250 The hack is to use -O1 for this file. Fixed in gcc 251 -current mainline, unable to work out where the fix is 252 right now. 253 kcah 254 255 256 port sh3 257 258 hack gcc-sh3-sed 259 mdate 23 Apr 2002 260 who thorpej 261 file usr.bin/sed/Makefile : 1.9 : 9 : 13 262 descr 263 The in-tree GCC 2.95.3-based compiler ICEs when building 264 with optimization for SuperH. Hack is to build with -O0. 265 kcah 266 267 268 port sh5 269 270 hack SuperH SH5 Toolchain Bugs 271 cdate 11 Jul 2002 272 who scw 273 file usr.sbin/ndbootd/ndbootd.c : 1.6 274 file usr.sbin/traceroute/traceroute.c : 1.48 275 descr 276 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 277 compiler error when assigning a bit-wise inverted value 278 under some circumstances. 279 Work around it by splitting the statement into two. 280 kcah 281 282 hack SuperH SH5 Toolchain Bugs 283 cdate 17 May 2003 284 who scw 285 file lib/libpthread/pthread_lock.c : 1.7 286 descr 287 The SuperH SH5 toolchain generates incorrect PIC code when 288 faced with a symbol which is declared extern, but has local 289 scope due to being defined within an asm() statement (without 290 being declared .globl in that statement). Work around it by 291 adding the .globl. 292 kcah 293 294 295 port sun2 296 297 hack gcc 3.3.2/mdsetimage 298 cdate Tue Oct 28 18:43:05 EST 2003 299 who fredette 300 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 301 descr 302 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 303 this hack uses -O0 to avoid the problem. 304 kcah 305 306 hack gcc 3.3.2/installboot/ffs.c 307 cdate Tue Oct 28 18:43:05 EST 2003 308 who fredette 309 file usr.sbin/installboot/Makefile : 1.26 310 descr 311 ffs.c causes cc1 to barf for as-yet unknown reasons. this 312 hack uses -O0 to avoid the problem. 313 kcah 314 315 316 port sun2, m68k 317 318 hack gcc 3.3.2/gcc/ra-colorize.c 319 cdate Wed Nov 5 11:03:13 EST 2003 320 who mrg 321 file gnu/usr.bin/gcc/backend/Makefile : 1.11 322 descr 323 ra-colorize.c causes a whole spew of unreferenced .L* local 324 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 325 kcah 326
Indexes created Wed Nov 05 19:10:08 GMT 2025