# $NetBSD: HACKS,v 1.34 2004/05/13 15:44:04 cl Exp $ # # This file is intended to document workarounds for currently unsolved # (mostly) compiler bugs. # # Format: # hack title # cdate creation date # mdate mod date # who responsible developer # port ... # affected ports, space separated, if not "all" # file affected file : revision : line from : line to # affected files and revision and line numbers describing hack # multiple lines if necessary. # pr NNNN ... # problem reports this hack works around, if known. Space # separated. # regress src/regress/directory/where/test/found # regression test directories, if available. # descr # insert short informal description (multi-line). (Longer ones # should be in the PR database. More formal descriptions might # be in the regress tree. See above). # kcah # closing bracket. # # this is a comment. hack netstat ieee1394 address printing. mdate 14 Nov 2000 who matt file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 descr Because the current implementation of IP over IEEE1394, the fw device address contains more than just the IEEE1394 EUI-64. So when printing out IEEE1394 addresses, ignore the extra stuff. kcah hack xterm vs. libterm mdate 01 Aug 2000 who jdc file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 pr 10383 descr In order to extend the termcap string over 1023 bytes, a ZZ entry was introduced to point to a memory location containing the full entry. Without this hack, xterm will export a termcap containing the ZZ entry, which will then be ignored by libterm. As xterm modifies the exported termcap, this would cause those modifications to be ignored. kcah hack wi-at-big-endian-bus cdate 15 Mar 2002 who martin file dev/ic/wireg.h descr Add an option to access the underlying bus in big endian byte order to work around deficiencies in bus_space_{read,write}_* macros. Those don't allow the implementation of a proper pcmcia bus space tag. kcah hack specific knowledge of colours in curses code cdate Sun Apr 6 11:05:24 BST 2003 who jdc file lib/libcurses/color.c : r1.24 descr Swap red/blue and yellow/cyan colours for COLOR_OTHER. Fix is to enhance libtermcap to understand terminfo-style % sequences. See also: http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html kcah hack Compensation for differing types of LINUX_USRSTACK and USRSTACK cdate 21 Aug 2003 who he file sys/miscfs/procfs/procfs_linux.c : 1.14 descr Not all ports have LINUX_USRSTACK and/or USRSTACK defined as literals/constants, but refer to variables of a type which is not "unsigned long", causing compilation of procfs_linux.c to fail with "makes integer from pointer without a cast". This is observed on e.g. the sun3 port. Ideally the "types" for symbols should be consistent across all ports. kcah hack GCC2 isn't C99 cdate 5 December 2003 who mrg file gnu/dist/binutils/ld/ldlex.c: r1.2 descr ldlex.c is generated from ldlex.l and we get macro redefinition errors from it if __STDC_VERSION__ is not C99 compliant. This hack forces NetBSD 1.6 and later systems to also include to get the relevant definitions. This hack should be backed out when all platforms have switched away from GCC2. kcah port vax hack gcc 2.95/vax cannot handle __builtin_ffs() cdate Fri Aug 23 21:31:15 CEST 2002 who ragge file sys/lib/libkern/libkern.h : 1.42 descr __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has added this feature to GCC 3 so it can be removed when switching. kcah hack gcc-vax-libbz2 mdate 27 Jun 2002 who thorpej file lib/libbz2/Makefile descr libbz2 is mis-compiled with optimization with GCC 2.95.3 on VAX. -O0 works around this problem. kcah hack gawk mdate 8 Nov 2003 who ragge file gnu/usr.bin/gawk/Makefile descr gawk is mis-compiled with optimization with GCC 2.95.3 on VAX. -O0 works around this problem. kcah hack vax Toolchain bug cdate 28 Mar 2003 who he file sys/arch/vax/vax/intvec.S : 1.5 descr Workaround for PR toolchain/20924. The assembler apparently tries to range-check byte offsets when it doesn't have sufficient information to make that decision. Workaround uses `brw' instead of `brb' instruction. kcah hack vax gcc 2.95.3 -Wuninitialized workarounds cdate 6 Nov 2003 who he file sys/dev/bi/if_ni.c : 1.22 file sys/arch/vax/vax/ctu.c : 1.20 descr Workaround for gcc 2.95.3 failing to detect that certain variables will be initialized; so that this code compiles with -Wuninitialized. Should be reviewed and possibly reverted when gcc 3.3.2 is ready for vax. kcah hack vax gcc 2.95.3 structure initialization cdat 13 May 2004 who cl file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 descr Workaround for gcc 2.95.3 failing to initialize structures and/or unions inside structures using nested designators. Should be reverted when gcc >=3.3.3 is ready for vax. kcah port sparc64 hack binutil-2.11-sparc64-pltrela mdate 14 Aug 2001 who eeh file libexec/ld.elf_so/arch/sparc64/mdreloc.c descr The first for PLT entries are reserved. There is some disagreement whether they should have associated relocation entries. Both the SPARC 32-bit and 64-bit ELF specifications say that they should have relocation entries, but the 32-bit SPARC binutils do not generate them, and now the 64-bit SPARC binutils have stopped generating them too. To provide binary compatibility, we will check the first entry, if it is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT, then the 4 reserved entries were not generated and our index is 4 entries too far, so we frob the rela pointer. kcah port arm hack gcc-unsigned-compare cdate 09 Mar 2002 mdate 18 Mar 2002 who bjh21 file dist/bind/lib/nameser/ns_parse.c : 1.3 file dist/dhcp/minires/ns_parse.c : 1.3 file dist/dhcp/omapip/result.c : 1.2 file dist/dhcp/server/failover.c : 1.3 file gnu/dist/gawk/eval.c : 1.4 file gnu/dist/toolchain/bfd/bfd.c : 1.2 file gnu/dist/toolchain/bfd/format.c : 1.2 file gnu/dist/toolchain/gdb/target.c : 1.2 file sys/kern/vfs_subr.c : 1.172 descr When checking that a potentially-unsigned enum is >= 0, assign it to an int first. This is necessary to avoid "comparison is always true" warnings with -fshort-enums. Casting to an int really should be enough, but turns out not to be. kcah hack gcc 3.3.2/arm sys/kern/uipc_socket.c cdate Tue Oct 28 18:02:16 GMT 2003 who skrll file sys/conf/arm/Makefile.arm : 1.19 descr Performing a build.sh tools on a CATS with NFS mounted obj and src directories results in "panic: receive 1" The hack is to compile sys/kern/uipc_socket.c with -fno-strict-aliasing kcah port pc532 hack egcs-pc532-ip6_mroute cdate 09 Jul 2002 who simonb file sys/arch/pc532/conf/Makefile.pc532 : 1.70 file sys/arch/pc532/conf/files.pc532 : 1.47 descr egcs 1.1.2 gets an "internal error--insn does not satisfy its constraints" error compiling ip6_mroute.c with -O2 or greater. -O1 works around this problem. kcah hack gcc-pc532-duffs_device cdate Mon Oct 27 07:23:05 UTC 2003 who simonb file sys/arch/pc532/conf/Makefile.pc532 : 1.71 file sys/arch/pc532/conf/files.pc532 : 1.52 pr GCC PR optimization/5230 descr gcc incorrectly gives an "unreachable code at beginning of switch statement" for a Duff's device construct in arch/pc532/dev/ncr.c. There is no way to disable just this warning, so -Wno-error is turned on for this file. kcah hack gcc332-cppmacro-ice cdate Sun Dec 7 12:48:33 UTC 2003 who simonb file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 descr gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. The hack is to use -O1 for this file. Fixed in gcc -current mainline, unable to work out where the fix is right now. kcah port sh3 hack gcc-sh3-sed mdate 23 Apr 2002 who thorpej file usr.bin/sed/Makefile : 1.9 : 9 : 13 descr The in-tree GCC 2.95.3-based compiler ICEs when building with optimization for SuperH. Hack is to build with -O0. kcah port sh5 hack SuperH SH5 Toolchain Bugs cdate 11 Jul 2002 who scw file usr.sbin/ndbootd/ndbootd.c : 1.6 file usr.sbin/traceroute/traceroute.c : 1.48 descr The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal compiler error when assigning a bit-wise inverted value under some circumstances. Work around it by splitting the statement into two. kcah hack SuperH SH5 Toolchain Bugs cdate 17 May 2003 who scw file lib/libpthread/pthread_lock.c : 1.7 descr The SuperH SH5 toolchain generates incorrect PIC code when faced with a symbol which is declared extern, but has local scope due to being defined within an asm() statement (without being declared .globl in that statement). Work around it by adding the .globl. kcah hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 cdate Sun Dec 7 19:44:05 GMT 2003 who scw file gnu/usr.bin/gcc3/backend/Makefile : 1.13 descr Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. Drop to -O1 for now when building for sh5. kcah hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 cdate Sun Dec 7 21:10:46 GMT 2003 who scw file gnu/lib/libbfd/Makefile : 1.39 descr Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c and elf64.c at -O2. Drop to -O1 for now when building for sh5. kcah hack gcc 3.3.2 on sh5 - fatal warning compiling function.c cdate Sun Dec 7 19:44:05 GMT 2003 who scw file gnu/usr.bin/gcc3/backend/Makefile : 1.13 descr Gcc3 for sh5 issues a warning: .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of mutually exclusive equal-tests is always 0. This causes the build to fail because of -Werror. Work-around by defining NOGCCERROR when building for sh5. kcah hack gcc 3.3.2 on sh5 - ICE compiling dist/bind/bin/named/ns_main.c cdate Sun Dec 7 19:44:05 GMT 2003 who scw file usr.sbin/bind/named/Makefile : 1.15 descr Gcc3 for sh5 gets an ICE compiling ns_main.c at -O2. Drop to -O1 for now when building for sh5. kcah port sun2 hack gcc 3.3.2/mdsetimage cdate Tue Oct 28 18:43:05 EST 2003 who fredette file gnu/usr.sbin/mdsetimage/Makefile : 1.15 descr mdsetimage.c causes cc1 to barf for as-yet unknown reasons. this hack uses -O0 to avoid the problem. kcah hack gcc 3.3.2/installboot/ffs.c cdate Tue Oct 28 18:43:05 EST 2003 who fredette file usr.sbin/installboot/Makefile : 1.26 descr ffs.c causes cc1 to barf for as-yet unknown reasons. this hack uses -O0 to avoid the problem. kcah port sun2, m68k hack gcc 3.3.2/gcc/ra-colorize.c cdate Wed Nov 5 11:03:13 EST 2003 who mrg file gnu/usr.bin/gcc/backend/Makefile : 1.11 descr ra-colorize.c causes a whole spew of unreferenced .L* local symbols. using -O0 (or even -O2 reportedly) avoids the problem. kcah port sparc64 hack disable optimzations for uvm_bio.c on 32 bit kernels cdate Sun Mar 21 14:14:04 MET 2004 who martin file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 file sys/arch/sparc64/conf/files.sparc64 : 1.93 descr The sparc compiler miscompiles uvm_bio.c when using any optimization. This results in ubc_release panics. kcah