416 lines
12 KiB
Plaintext
416 lines
12 KiB
Plaintext
# $NetBSD: HACKS,v 1.42 2005/02/22 18:47:09 christos Exp $
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#
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# This file is intended to document workarounds for currently unsolved
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# (mostly) compiler bugs.
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#
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# Format:
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# hack title
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# cdate creation date
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# mdate mod date
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# who responsible developer
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# port ...
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# affected ports, space separated, if not "all"
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# file affected file : revision : line from : line to
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# affected files and revision and line numbers describing hack
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# multiple lines if necessary.
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# pr NNNN ...
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# problem reports this hack works around, if known. Space
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# separated.
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# regress src/regress/directory/where/test/found
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# regression test directories, if available.
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# descr
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# insert short informal description (multi-line). (Longer ones
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# should be in the PR database. More formal descriptions might
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# be in the regress tree. See above).
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# kcah
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# closing bracket.
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#
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# this is a comment.
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hack netstat ieee1394 address printing.
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mdate 14 Nov 2000
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who matt
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file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503
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descr
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Because the current implementation of IP over IEEE1394, the
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fw device address contains more than just the IEEE1394 EUI-64.
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So when printing out IEEE1394 addresses, ignore the extra stuff.
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kcah
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hack xterm vs. libterm
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mdate 01 Aug 2000
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who jdc
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file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614
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pr 10383
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descr
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In order to extend the termcap string over 1023 bytes, a ZZ entry was
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introduced to point to a memory location containing the full entry.
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Without this hack, xterm will export a termcap containing the ZZ
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entry, which will then be ignored by libterm. As xterm modifies the
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exported termcap, this would cause those modifications to be ignored.
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kcah
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hack wi-at-big-endian-bus
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cdate 15 Mar 2002
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who martin
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file dev/ic/wireg.h
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descr Add an option to access the underlying bus in big endian byte order
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to work around deficiencies in bus_space_{read,write}_* macros.
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Those don't allow the implementation of a proper pcmcia bus space
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tag.
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kcah
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hack specific knowledge of colours in curses code
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cdate Sun Apr 6 11:05:24 BST 2003
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who jdc
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file lib/libcurses/color.c : r1.24
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descr
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Swap red/blue and yellow/cyan colours for COLOR_OTHER.
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Fix is to enhance libtermcap to understand terminfo-style % sequences.
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See also:
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http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html
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kcah
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hack Compensation for differing types of LINUX_USRSTACK and USRSTACK
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cdate 21 Aug 2003
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who he
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file sys/miscfs/procfs/procfs_linux.c : 1.14
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descr
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Not all ports have LINUX_USRSTACK and/or USRSTACK defined as
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literals/constants, but refer to variables of a type which is
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not "unsigned long", causing compilation of procfs_linux.c to
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fail with "makes integer from pointer without a cast". This
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is observed on e.g. the sun3 port. Ideally the "types" for
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symbols should be consistent across all ports.
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kcah
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hack GCC2 isn't C99
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cdate 5 December 2003
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who mrg
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file gnu/dist/binutils/ld/ldlex.c: r1.2
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descr
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ldlex.c is generated from ldlex.l and we get macro redefinition
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errors from it if __STDC_VERSION__ is not C99 compliant. This
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hack forces NetBSD 1.6 and later systems to also include <stdint.h>
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to get the relevant definitions. This hack should be backed out
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when all platforms have switched away from GCC2.
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kcah
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hack gcc-strict-aliasing
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cdate 6 August 2004
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who junyoung
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pr 26516
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file src/usr.sbin/racoon/racoon/Makefile : 1.21
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descr
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GCC issues a warning "dereferencing type-punned pointer will break
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strict-aliasing rules" when compiling
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crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this
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is due to use of type casting in a non-standard way in the code and
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not a compiler bug. Once a new release of KAME with a proper fix
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applied is imported this should be backed out.
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kcah
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port vax
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hack gcc 2.95/vax cannot handle __builtin_ffs()
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cdate Fri Aug 23 21:31:15 CEST 2002
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who ragge
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file sys/lib/libkern/libkern.h : 1.42
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descr
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__builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has
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added this feature to GCC 3 so it can be removed when switching.
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kcah
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hack gcc-vax-libbz2
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mdate 27 Jun 2002
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who thorpej
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file lib/libbz2/Makefile
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descr
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libbz2 is mis-compiled with optimization with GCC 2.95.3
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on VAX. -O0 works around this problem.
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kcah
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hack gawk
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mdate 8 Nov 2003
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who ragge
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file gnu/usr.bin/gawk/Makefile
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descr
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gawk is mis-compiled with optimization with GCC 2.95.3
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on VAX. -O0 works around this problem.
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kcah
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hack vax Toolchain bug
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cdate 28 Mar 2003
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who he
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file sys/arch/vax/vax/intvec.S : 1.5
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descr
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Workaround for PR toolchain/20924. The assembler apparently
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tries to range-check byte offsets when it doesn't have
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sufficient information to make that decision.
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Workaround uses `brw' instead of `brb' instruction.
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kcah
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hack vax gcc 2.95.3 -Wuninitialized workarounds
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cdate 6 Nov 2003
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who he
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file sys/dev/bi/if_ni.c : 1.22
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file sys/arch/vax/vax/ctu.c : 1.20
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descr
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Workaround for gcc 2.95.3 failing to detect that certain
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variables will be initialized; so that this code compiles
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with -Wuninitialized. Should be reviewed and possibly
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reverted when gcc 3.3.2 is ready for vax.
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kcah
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hack vax gcc 2.95.3 structure initialization
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cdat 13 May 2004
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who cl
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file sys/miscfs/kernfs/kernfs_vnops.c : 1.104
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descr
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Workaround for gcc 2.95.3 failing to initialize structures
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and/or unions inside structures using nested designators.
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Should be reverted when gcc >=3.3.3 is ready for vax.
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kcah
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hack vax gcc 2.95.3 needs -I. to build nslexer.c
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cdat 6 Jun 2004
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who mhitch
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file lib/libc/arch/vax/Makefile.inc : 1.6
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descr
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It appears necessary to add -I. to CPPFLAGS when building
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nslesxer.c. This may be caused by gcc 2.95.3 being used.
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Should be reverted when a newer gcc is ready for vax.
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kcah
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port sparc64
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hack binutil-2.11-sparc64-pltrela
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mdate 14 Aug 2001
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who eeh
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file libexec/ld.elf_so/arch/sparc64/mdreloc.c
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descr
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The first four PLT entries are reserved. There is some
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disagreement whether they should have associated relocation
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entries. Both the SPARC 32-bit and 64-bit ELF specifications
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say that they should have relocation entries, but the 32-bit
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SPARC binutils do not generate them, and now the 64-bit SPARC
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binutils have stopped generating them too.
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To provide binary compatibility, we will check the first entry,
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if it is reserved it should not be of the type JMP_SLOT. If it
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is JMP_SLOT, then the 4 reserved entries were not generated and
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our index is 4 entries too far, so we frob the rela pointer.
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kcah
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port arm
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hack gcc-unsigned-compare
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cdate 09 Mar 2002
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mdate 18 Mar 2002
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who bjh21
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file dist/bind/lib/nameser/ns_parse.c : 1.3
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file dist/dhcp/minires/ns_parse.c : 1.3
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file dist/dhcp/omapip/result.c : 1.2
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file dist/dhcp/server/failover.c : 1.3
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file gnu/dist/gawk/eval.c : 1.4
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file gnu/dist/toolchain/bfd/bfd.c : 1.2
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file gnu/dist/toolchain/bfd/format.c : 1.2
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file gnu/dist/toolchain/gdb/target.c : 1.2
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file sys/kern/vfs_subr.c : 1.172
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descr When checking that a potentially-unsigned enum is >= 0, assign
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it to an int first. This is necessary to avoid "comparison is
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always true" warnings with -fshort-enums. Casting to an int
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really should be enough, but turns out not to be.
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kcah
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hack gcc 3.3.2/arm sys/kern/uipc_socket.c
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cdate Tue Oct 28 18:02:16 GMT 2003
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who skrll
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pr 23044
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file sys/arch/arm/conf/Makefile.arm : 1.19
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descr
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Performing a build.sh tools on a CATS with NFS mounted
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obj and src directories results in "panic: receive 1"
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The hack is to compile sys/kern/uipc_socket.c with
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-fno-strict-aliasing
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kcah
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port pc532
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hack egcs-pc532-ip6_mroute
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cdate 09 Jul 2002
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who simonb
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file sys/arch/pc532/conf/Makefile.pc532 : 1.70
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file sys/arch/pc532/conf/files.pc532 : 1.47
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descr
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egcs 1.1.2 gets an "internal error--insn does not satisfy its
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constraints" error compiling ip6_mroute.c with -O2 or greater.
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-O1 works around this problem.
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kcah
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hack gcc-pc532-duffs_device
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cdate Mon Oct 27 07:23:05 UTC 2003
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who simonb
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file sys/arch/pc532/conf/Makefile.pc532 : 1.71
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file sys/arch/pc532/conf/files.pc532 : 1.52
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pr GCC PR optimization/5230
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descr
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gcc incorrectly gives an "unreachable code at beginning of
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switch statement" for a Duff's device construct in
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arch/pc532/dev/ncr.c. There is no way to disable just this
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warning, so -Wno-error is turned on for this file.
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kcah
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hack gcc332-cppmacro-ice
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cdate Sun Dec 7 12:48:33 UTC 2003
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who simonb
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file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2
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descr
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gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2.
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The hack is to use -O1 for this file. Fixed in gcc
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-current mainline, unable to work out where the fix is
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right now.
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kcah
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port sh3
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hack gcc-sh3-sed
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mdate 23 Apr 2002
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who thorpej
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file usr.bin/sed/Makefile : 1.9 : 9 : 13
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descr
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The in-tree GCC 2.95.3-based compiler ICEs when building
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with optimization for SuperH. Hack is to build with -O0.
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kcah
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port sh5
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hack SuperH SH5 Toolchain Bugs
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cdate 11 Jul 2002
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who scw
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file usr.sbin/ndbootd/ndbootd.c : 1.6
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file usr.sbin/traceroute/traceroute.c : 1.48
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descr
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The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal
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compiler error when assigning a bit-wise inverted value
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under some circumstances.
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Work around it by splitting the statement into two.
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kcah
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hack SuperH SH5 Toolchain Bugs
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cdate 17 May 2003
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who scw
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file lib/libpthread/pthread_lock.c : 1.7
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descr
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The SuperH SH5 toolchain generates incorrect PIC code when
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faced with a symbol which is declared extern, but has local
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scope due to being defined within an asm() statement (without
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being declared .globl in that statement). Work around it by
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adding the .globl.
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kcah
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hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2
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cdate Sun Dec 7 19:44:05 GMT 2003
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who scw
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file gnu/usr.bin/gcc3/backend/Makefile : 1.13
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descr
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Gcc3 for sh5 gets an ICE compiling reload1.c at -O2.
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Drop to -O1 for now when building for sh5.
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kcah
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hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2
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cdate Sun Dec 7 21:10:46 GMT 2003
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who scw
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file gnu/lib/libbfd/Makefile : 1.39
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descr
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Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c
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and elf64.c at -O2.
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Drop to -O1 for now when building for sh5.
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kcah
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hack gcc 3.3.2 on sh5 - fatal warning compiling function.c
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cdate Sun Dec 7 19:44:05 GMT 2003
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who scw
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file gnu/usr.bin/gcc3/backend/Makefile : 1.13
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descr
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Gcc3 for sh5 issues a warning:
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.../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of
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mutually exclusive equal-tests is always 0.
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This causes the build to fail because of -Werror.
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Work-around by defining NOGCCERROR when building for sh5.
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kcah
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hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c
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cdate Thu Nov 11 00:35:33 UTC 2004
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who he
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file usr.sbin/bind/libdns/Makefile/1.2
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descr
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Gcc3 for sh5 gets an ICE compiling these files at -O2.
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Drop to -O1 for now when building for sh5.
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kcah
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port sun2
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hack gcc 3.3.2/mdsetimage
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cdate Tue Oct 28 18:43:05 EST 2003
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who fredette
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file gnu/usr.sbin/mdsetimage/Makefile : 1.15
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descr
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mdsetimage.c causes cc1 to barf for as-yet unknown reasons.
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this hack uses -O0 to avoid the problem.
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kcah
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hack gcc 3.3.2/installboot/ffs.c
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cdate Tue Oct 28 18:43:05 EST 2003
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who fredette
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file usr.sbin/installboot/Makefile : 1.26
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descr
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ffs.c causes cc1 to barf for as-yet unknown reasons. this
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hack uses -O0 to avoid the problem.
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kcah
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port sun2, m68k
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hack gcc 3.3.2/gcc/ra-colorize.c
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cdate Wed Nov 5 11:03:13 EST 2003
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who mrg
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file gnu/usr.bin/gcc/backend/Makefile : 1.11
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descr
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ra-colorize.c causes a whole spew of unreferenced .L* local
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symbols. using -O0 (or even -O2 reportedly) avoids the problem.
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kcah
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port sparc64
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hack disable optimzations for uvm_bio.c on 32 bit kernels
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cdate Sun Mar 21 14:14:04 MET 2004
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who martin
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file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54
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file sys/arch/sparc64/conf/files.sparc64 : 1.93
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descr
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The sparc compiler miscompiles uvm_bio.c when using
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any optimization. This results in ubc_release panics.
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kcah
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port macppc
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hack remove inline from rotate_{left,right}
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cdate Tue Feb 22 13:43:25 EST 2005
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who christos
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file src/dist/bind/lib/dns/rbt.c
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descr
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The macppc gcc-3.3 compiler miscompiles rbt.c when these
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functions are inlined. The error is:
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.* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed
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.* named[368]: exiting (due to assertion failure)
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This is reportedly fixed in gcc-3.4
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kcah
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