HACKS revision 1.11
1 # $NetBSD: HACKS,v 1.11 2003/10/26 01:56:54 lukem 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 gcc 2.95/vax cannot handle __builtin_ffs() 31 cdate Fri Aug 23 21:31:15 CEST 2002 32 who ragge 33 port vax 34 file sys/lib/libkern/libkern.h : 1.42 35 descr 36 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has added 37 this feature to GCC 3 so it can be removed when switching. 38 kcah 39 40 hack gcc 2.95.3 -O2 bug 41 cdate Sun Jan 6 23:17:28 UTC 2002 42 who lukem 43 port alpha 44 file sbin/newfs/mkfs.c : (all?) 45 pr 15156 46 descr 47 newfs built with gcc -O2 dumps core part-way through. 48 using -O1 avoids the problem 49 kcah 50 51 hack binutil-2.11-sparc64-pltrela 52 mdate 14 Aug 2001 53 who eeh 54 port sparc64 55 file libexec/ld.elf_so/reloc.c: 1.41 : 597 : 619 56 descr 57 The first for PLT entries are reserved. There is some disagreement 58 whether they should have associated relocation entries. Both the 59 SPARC 32-bit and 64-bit ELF specifications say that they should have 60 relocation entries, but the 32-bit SPARC binutils do not generate 61 them, and now the 64-bit SPARC binutils have stopped generating them 62 too. 63 64 To provide binary compatibility, we will check the first entry, if it 65 is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT, 66 then the 4 reserved entries were not generated and our index is 4 67 entries too far, so we frob the rela pointer. 68 kcah 69 70 hack gcc-arm32-schedule 71 mdate 04 May 2000 72 who is 73 file lib/libc/stdlib/strtoull.c : 1.3 : 78 : 81 74 file lib/libc/stdlib/strtouq.c : 1.15 : 73 : 76 75 pr 9613 76 descr 77 strtoull() was returning a wrong result for small numbers with bit 31 78 set. This is a gcc/arm32 compiler bug in gcc < 2.95.2. Adding 79 (void)&acc; works around it. 80 kcah 81 82 hack netstat ieee1394 address printing. 83 mdate 14 Nov 2000 84 who matt 85 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 86 descr 87 Because the current implementation of IP over IEEE1394, the 88 fw device address contains more than just the IEEE1394 EUI-64. 89 So when printing out IEEE1394 addresses, ignore the extra stuff. 90 kcah 91 92 hack xterm vs. libterm 93 mdate 01 Aug 2000 94 who jdc 95 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 96 pr 10383 97 descr 98 In order to extend the termcap string over 1023 bytes, a ZZ entry was 99 introduced to point to a memory location containing the full entry. 100 Without this hack, xterm will export a termcap containing the ZZ 101 entry, which will then be ignored by libterm. As xterm modifies the 102 exported termcap, this would cause those modifications to be ignored. 103 kcah 104 105 hack gcc-sh3-sed 106 mdate 23 Apr 2002 107 who thorpej 108 file usr.bin/sed/Makefile : 1.9 : 9 : 13 109 descr 110 The in-tree GCC 2.95.3-based compiler ICEs when building 111 with optimization for SuperH. Hack is to biuld with -O0. 112 kcah 113 114 hack gcc-unsigned-compare 115 cdate 09 Mar 2002 116 mdate 18 Mar 2002 117 who bjh21 118 port arm 119 file dist/bind/lib/nameser/ns_parse.c : 1.3 120 file dist/dhcp/minires/ns_parse.c : 1.3 121 file dist/dhcp/omapip/result.c : 1.2 122 file dist/dhcp/server/failover.c : 1.3 123 file gnu/dist/gawk/eval.c : 1.4 124 file gnu/dist/toolchain/bfd/bfd.c : 1.2 125 file gnu/dist/toolchain/bfd/format.c : 1.2 126 file gnu/dist/toolchain/gdb/target.c : 1.2 127 file sys/kern/vfs_subr.c : 1.172 128 descr When checking that a potentially-unsigned enum is >= 0, assign it 129 to an int first. This is necessary to avoid "comparison is always 130 true" warnings with -fshort-enums. Casting to an int really should 131 be enough, but turns out not to be. 132 kcah 133 134 hack wi-at-big-endian-bus 135 cdate 15 Mar 2002 136 who martin 137 file dev/ic/wireg.h 138 descr Add an option to access the underlying bus in big endian byte order 139 to work around deficiencies in bus_space_{read,write}_* macros. 140 Those don't allow the implementation of a proper pcmcia bus space 141 tag. 142 kcah 143 144 hack gcc 2.95.3 -O2 (-fgcse) bug 145 cdate Sun May 5 18:36:04 UTC 2002 146 who tsutsui 147 port macppc 148 file sys/arch/macppc/dev/adb_direct.c: 1.24 : 1895 : 1896 149 pr 16678 150 descr 151 gcc-2.95.3 does generates wrong code on optimization 152 by gcc -O2 (-fgcse), and adb_read_date_time() returns 153 wrong value on cuda system. 154 A null asm statement has been added to avoid this for workaround. 155 kcah 156 157 hack gcc-vax-libbz2 158 mdate 27 Jun 2002 159 who thorpej 160 port vax 161 file lib/libbz2/Makefile 162 descr 163 libbz2 is mis-compiled with optimization with GCC 2.95.3 164 on VAX. -O0 works around this problem. 165 kcah 166 167 hack egcs-pc532-ip6_mroute 168 cdate 09 Jul 2002 169 who simonb 170 port pc532 171 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 172 file sys/arch/pc532/conf/files.pc532 : 1.47 173 descr 174 egcs 1.1.2 gets an "internal error--insn does not satisfy its 175 constraints" error compiling ip6_mroute.c with -O2 or greater. 176 -O1 works around this problem. 177 kcah 178 179 hack SuperH SH5 Toolchain Bugs 180 cdate 11 Jul 2002 181 who scw 182 port sh5 183 file usr.sbin/ndbootd/ndbootd.c : 1.6 184 file usr.sbin/traceroute/traceroute.c : 1.48 185 descr 186 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 187 compiler error when assigning a bit-wise inverted value 188 under some circumstances. 189 Work around it by splitting the statement into two. 190 kcah 191 192 hack vax Toolchain bug 193 cdate 28 Mar 2003 194 who he 195 port vax 196 file sys/arch/vax/vax/intvec.S : 1.5 197 descr 198 Workaround for PR toolchain/20924. The assembler apparently 199 tries to range-check byte offsets when it doesn't have 200 sufficient information to make that decision. 201 Workaround uses `brw' instead of `brb' instruction. 202 kcah 203 204 hack specific knowledge of colours in curses code 205 cdate Sun Apr 6 11:05:24 BST 2003 206 who jdc 207 port all 208 file lib/libcurses/color.c : r1.24 209 descr 210 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 211 Fix is to enhance libtermcap to understand terminfo-style % sequences. 212 See also: 213 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 214 kcah 215 216 hack SuperH SH5 Toolchain Bugs 217 cdate 17 May 2003 218 who scw 219 port sh5 220 file lib/libpthread/pthread_lock.c : 1.7 221 descr 222 The SuperH SH5 toolchain generates incorrect PIC code when faced 223 with a symbol which is declared extern, but has local scope due 224 to being defined within an asm() statement (without being declared 225 .globl in that statement). Work around it by adding the .globl. 226 kcah 227 228 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 229 cdate 21 Aug 2003 230 who he 231 file sys/miscfs/procfs/procfs_linux.c : 1.14 232 descr 233 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 234 literals/constants, but refer to variables of a type which is 235 not "unsigned long", causing compilation of procfs_linux.c to 236 fail with "makes integer from pointer without a cast". This 237 is observed on e.g. the sun3 port. Ideally the "types" for 238 symbols should be consistent across all ports. 239 kcah 240 241 hack gcc 3.3.x bug 242 cdate Sun Oct 26 01:50:16 UTC 2003 243 who lukem 244 port MACHINE_ARCH == arm 245 file usr.bin/newsyslog/newsyslog.c 246 pr 22986 23002 23217 247 descr 248 newsyslog fails with 249 newsyslog: config line 7: bad flags 250 solved when compiled with -fno-gcse-lm 251 kcah 252
Indexes created Wed Nov 05 21:10:10 GMT 2025