HACKS revision 1.14
1 # $NetBSD: HACKS,v 1.14 2003/10/27 07:31:07 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 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 binutil-2.11-sparc64-pltrela 41 mdate 14 Aug 2001 42 who eeh 43 port sparc64 44 file libexec/ld.elf_so/reloc.c: 1.41 : 597 : 619 45 descr 46 The first for PLT entries are reserved. There is some disagreement 47 whether they should have associated relocation entries. Both the 48 SPARC 32-bit and 64-bit ELF specifications say that they should have 49 relocation entries, but the 32-bit SPARC binutils do not generate 50 them, and now the 64-bit SPARC binutils have stopped generating them 51 too. 52 53 To provide binary compatibility, we will check the first entry, if it 54 is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT, 55 then the 4 reserved entries were not generated and our index is 4 56 entries too far, so we frob the rela pointer. 57 kcah 58 59 hack netstat ieee1394 address printing. 60 mdate 14 Nov 2000 61 who matt 62 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 63 descr 64 Because the current implementation of IP over IEEE1394, the 65 fw device address contains more than just the IEEE1394 EUI-64. 66 So when printing out IEEE1394 addresses, ignore the extra stuff. 67 kcah 68 69 hack xterm vs. libterm 70 mdate 01 Aug 2000 71 who jdc 72 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 73 pr 10383 74 descr 75 In order to extend the termcap string over 1023 bytes, a ZZ entry was 76 introduced to point to a memory location containing the full entry. 77 Without this hack, xterm will export a termcap containing the ZZ 78 entry, which will then be ignored by libterm. As xterm modifies the 79 exported termcap, this would cause those modifications to be ignored. 80 kcah 81 82 hack gcc-sh3-sed 83 mdate 23 Apr 2002 84 who thorpej 85 file usr.bin/sed/Makefile : 1.9 : 9 : 13 86 descr 87 The in-tree GCC 2.95.3-based compiler ICEs when building 88 with optimization for SuperH. Hack is to biuld with -O0. 89 kcah 90 91 hack gcc-unsigned-compare 92 cdate 09 Mar 2002 93 mdate 18 Mar 2002 94 who bjh21 95 port arm 96 file dist/bind/lib/nameser/ns_parse.c : 1.3 97 file dist/dhcp/minires/ns_parse.c : 1.3 98 file dist/dhcp/omapip/result.c : 1.2 99 file dist/dhcp/server/failover.c : 1.3 100 file gnu/dist/gawk/eval.c : 1.4 101 file gnu/dist/toolchain/bfd/bfd.c : 1.2 102 file gnu/dist/toolchain/bfd/format.c : 1.2 103 file gnu/dist/toolchain/gdb/target.c : 1.2 104 file sys/kern/vfs_subr.c : 1.172 105 descr When checking that a potentially-unsigned enum is >= 0, assign it 106 to an int first. This is necessary to avoid "comparison is always 107 true" warnings with -fshort-enums. Casting to an int really should 108 be enough, but turns out not to be. 109 kcah 110 111 hack wi-at-big-endian-bus 112 cdate 15 Mar 2002 113 who martin 114 file dev/ic/wireg.h 115 descr Add an option to access the underlying bus in big endian byte order 116 to work around deficiencies in bus_space_{read,write}_* macros. 117 Those don't allow the implementation of a proper pcmcia bus space 118 tag. 119 kcah 120 121 hack gcc-vax-libbz2 122 mdate 27 Jun 2002 123 who thorpej 124 port vax 125 file lib/libbz2/Makefile 126 descr 127 libbz2 is mis-compiled with optimization with GCC 2.95.3 128 on VAX. -O0 works around this problem. 129 kcah 130 131 hack egcs-pc532-ip6_mroute 132 cdate 09 Jul 2002 133 who simonb 134 port pc532 135 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 136 file sys/arch/pc532/conf/files.pc532 : 1.47 137 descr 138 egcs 1.1.2 gets an "internal error--insn does not satisfy its 139 constraints" error compiling ip6_mroute.c with -O2 or greater. 140 -O1 works around this problem. 141 kcah 142 143 hack SuperH SH5 Toolchain Bugs 144 cdate 11 Jul 2002 145 who scw 146 port sh5 147 file usr.sbin/ndbootd/ndbootd.c : 1.6 148 file usr.sbin/traceroute/traceroute.c : 1.48 149 descr 150 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 151 compiler error when assigning a bit-wise inverted value 152 under some circumstances. 153 Work around it by splitting the statement into two. 154 kcah 155 156 hack vax Toolchain bug 157 cdate 28 Mar 2003 158 who he 159 port vax 160 file sys/arch/vax/vax/intvec.S : 1.5 161 descr 162 Workaround for PR toolchain/20924. The assembler apparently 163 tries to range-check byte offsets when it doesn't have 164 sufficient information to make that decision. 165 Workaround uses `brw' instead of `brb' instruction. 166 kcah 167 168 hack specific knowledge of colours in curses code 169 cdate Sun Apr 6 11:05:24 BST 2003 170 who jdc 171 port all 172 file lib/libcurses/color.c : r1.24 173 descr 174 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 175 Fix is to enhance libtermcap to understand terminfo-style % sequences. 176 See also: 177 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 178 kcah 179 180 hack SuperH SH5 Toolchain Bugs 181 cdate 17 May 2003 182 who scw 183 port sh5 184 file lib/libpthread/pthread_lock.c : 1.7 185 descr 186 The SuperH SH5 toolchain generates incorrect PIC code when faced 187 with a symbol which is declared extern, but has local scope due 188 to being defined within an asm() statement (without being declared 189 .globl in that statement). Work around it by adding the .globl. 190 kcah 191 192 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 193 cdate 21 Aug 2003 194 who he 195 file sys/miscfs/procfs/procfs_linux.c : 1.14 196 descr 197 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 198 literals/constants, but refer to variables of a type which is 199 not "unsigned long", causing compilation of procfs_linux.c to 200 fail with "makes integer from pointer without a cast". This 201 is observed on e.g. the sun3 port. Ideally the "types" for 202 symbols should be consistent across all ports. 203 kcah 204 205 hack gcc 3.3.x bug 206 cdate Sun Oct 26 01:50:16 UTC 2003 207 who lukem 208 port MACHINE_ARCH == arm 209 file usr.bin/newsyslog/newsyslog.c 210 pr 22986 23002 23217 211 descr 212 newsyslog fails with 213 newsyslog: config line 7: bad flags 214 solved when compiled with -fno-gcse-lm 215 kcah 216 217 hack gcc-pc532-duffs_device 218 cdate Mon Oct 27 07:23:05 UTC 2003 219 who simonb 220 port pc532 221 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 222 file sys/arch/pc532/conf/files.pc532 : 1.52 223 pr GCC PR optimization/5230 224 descr 225 gcc incorrectly gives an "unreachable code at beginning of switch 226 statement" for a Duff's device construct in arch/pc532/dev/ncr.c. 227 There is now way to disable just this warning, so -Wno-error is 228 turned on for this file. 229 kcah 230
Indexes created Wed Nov 05 22:09:55 GMT 2025