# $NetBSD: HACKS,v 1.12 2003/10/26 16:35:18 mycroft 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 gcc 2.95/vax cannot handle __builtin_ffs() cdate Fri Aug 23 21:31:15 CEST 2002 who ragge port vax 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 binutil-2.11-sparc64-pltrela mdate 14 Aug 2001 who eeh port sparc64 file libexec/ld.elf_so/reloc.c: 1.41 : 597 : 619 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 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 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 biuld with -O0. kcah hack gcc-unsigned-compare cdate 09 Mar 2002 mdate 18 Mar 2002 who bjh21 port arm 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 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 gcc-vax-libbz2 mdate 27 Jun 2002 who thorpej port vax 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 egcs-pc532-ip6_mroute cdate 09 Jul 2002 who simonb port pc532 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 SuperH SH5 Toolchain Bugs cdate 11 Jul 2002 who scw port sh5 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 vax Toolchain bug cdate 28 Mar 2003 who he port vax 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 specific knowledge of colours in curses code cdate Sun Apr 6 11:05:24 BST 2003 who jdc port all 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 SuperH SH5 Toolchain Bugs cdate 17 May 2003 who scw port sh5 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 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 gcc 3.3.x bug cdate Sun Oct 26 01:50:16 UTC 2003 who lukem port MACHINE_ARCH == arm file usr.bin/newsyslog/newsyslog.c pr 22986 23002 23217 descr newsyslog fails with newsyslog: config line 7: bad flags solved when compiled with -fno-gcse-lm kcah