332 lines
9.6 KiB
Plaintext
332 lines
9.6 KiB
Plaintext
# $NetBSD: HACKS,v 1.3 2003/04/06 10:12:20 jdc 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 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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port vax
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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 added
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this feature to GCC 3 so it can be removed when switching.
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kcah
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hack gcc 2.95.3 -O2 bug
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cdate Sun Jan 6 23:17:28 UTC 2002
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who lukem
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port alpha
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file sbin/newfs/mkfs.c : (all?)
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pr 15156
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descr
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newfs built with gcc -O2 dumps core part-way through.
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using -O1 avoids the problem
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kcah
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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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port sparc64
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file libexec/ld.elf_so/reloc.c: 1.41 : 597 : 619
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descr
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The first for PLT entries are reserved. There is some disagreement
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whether they should have associated relocation entries. Both the
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SPARC 32-bit and 64-bit ELF specifications say that they should have
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relocation entries, but the 32-bit SPARC binutils do not generate
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them, and now the 64-bit SPARC binutils have stopped generating them
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too.
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To provide binary compatibility, we will check the first entry, if it
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is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT,
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then the 4 reserved entries were not generated and our index is 4
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entries too far, so we frob the rela pointer.
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kcah
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hack gcc-arm32-schedule
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mdate 04 May 2000
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who is
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file lib/libc/stdlib/strtoull.c : 1.3 : 78 : 81
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file lib/libc/stdlib/strtouq.c : 1.15 : 73 : 76
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pr 9613
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descr
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strtoull() was returning a wrong result for small numbers with bit 31
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set. This is a gcc/arm32 compiler bug in gcc < 2.95.2. Adding
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(void)&acc; works around it.
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kcah
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hack gcc-sparc64-memorysize
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mdate 17 Sep 2000
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who mrg
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port sparc64
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file lib/libc/hash/sha1.c : 1.6 : 78 : 129 : 162 : 189
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file sys/lib/libkern/sha1.c : 1.6 : 78 : 129 : 162 : 189
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file usr.sbin/bind/lib/Makefile : 1.14 : 87 : 91
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descr
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the normal SHA1Transform() function causes the sparc64 compiler to
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use excessive amounts of memory attempting to optimise this function.
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using no optimisation allows the function to build. this hack
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splits the mathematical functions inside SHA1Transform() into 4
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separate functions, which avoids the optimiser explosion.
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kcah
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hack gcc-sparc64-double-arguments
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mdate 18 Sep 2000
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who mrg
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port sparc64
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file xsrc/xc/lib/fonts/Type1/type1.c : 1.2 : 1461 : 1507 : 1702 : 1709
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descr
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in passing 17 "double" arguments to a function, gcc incorrectly tries
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to use a register that doesn't exist, causing an internal error. this
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hack changes the way arguments are passed to the function, such that
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a pointer to a "double" (really an array) is passed, and the old
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arguments are assigned within the function.
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kcah
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hack gcc-sparc64-gawk
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mdate 28 Oct 2000
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who mrg
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port sparc64
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file gnu/usr.bin/gawk/Makefile : 1.11 : 21 : 24
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descr
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gcc fails to build gawk properly, due to double floating point bugs.
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this simple test program will fail to print ``ab'':
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BEGIN { f = "abc"; print substr(f, 1, 2); exit }
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the work around is simple: use -msoft-quad-float.
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kcah
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hack gcc-sparc64-libgcc
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mdate 01 Dec 2001
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who jmc
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port sparc64
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file gnu/lib/libgcc/Makefile : 1.29 : 24 : 27
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descr
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gcc fails to do double -> int conversions correctly without
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soft-quad-float. Add it in there for the internal conversion
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routines. This appears to be more than likely emulations bugs than
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compiler bugs as the assembly looks correct on the surface.
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kcah
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hack gcc-sparc64-iostat-systat
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mdate 04 Feb 2001
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who mrg
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port sparc64
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file usr.sbin/iostat/Makefile : 1.17 : 7 : 10
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file usr.bin/systat/Makefile : 1.23 : 6 : 9
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descr
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gcc fails to build iostat properly, due to double floating point bugs.
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results will include "Inf" and other garbage.
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the work around is simple: use -msoft-quad-float.
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kcah
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hack gcc-sparc64-nawk
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mdate 25 Oct 2001
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who martin
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port sparc64
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file usr.bin/awk/Makefile : 1.3 : 13 : 15
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descr
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Don't use long double on sparc64.
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kcah
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hack gcc-sparc64-ntp
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mdate 12 Nov 2000
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who martin
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port sparc64
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file usr.sbin/ntp/Makefile.inc : 1.5 : 17 : 19
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descr
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gcc fails to build ntpd properly, due to double floating point bugs.
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Ntpd will fail to decode incoming packets; ntpdc -s will report
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a delay, offset and dispersion of 0.0000 for all peers.
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the work around is simple: use -msoft-quad-float.
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kcah
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hack gcc-sparc64-x_dhclient
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mdate 27 Dec 2000
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who mrg
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port sparc64
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file distrib/utils/x_dhclient/Makefile : 1.6 : 28 : 30
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descr
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gcc fails with an ICE while building dhclient's parse.c with -O2
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and -Os. the work around is simple: don't use -Os.
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kcah
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hack lint-no-long-double
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mdate 17 Aug 2001
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who eeh
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port sparc64
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file usr.bin/xlint/lint1/param.h: 1.14 :
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descr
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Don't use long double on sparc64.
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kcah
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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 gcc-3-libtelnet
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mdate 29 Jan 2002
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who thorpej
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file lib/libtelnet/Makefile : 1.14 : 14 : 17
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descr
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GCC 3.x issues a spurious warning when compiling a Duff's Device
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with optimization, even though it compiles the file correctly.
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GCC PR optimization/5230. kerberos.c contains a Duff's Device
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in the checksum routine. Hack is to build libtelnet w/o optimization
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if HAVE_GCC3 is set.
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kcah
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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 biuld with -O0.
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kcah
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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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port arm
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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 it
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to an int first. This is necessary to avoid "comparison is always
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true" warnings with -fshort-enums. Casting to an int really should
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be enough, but turns out not to be.
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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 gcc 2.95.3 -O2 (-fgcse) bug
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cdate Sun May 5 18:36:04 UTC 2002
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who tsutsui
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port macppc
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file sys/arch/macppc/dev/adb_direct.c: 1.24 : 1895 : 1896
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pr 16678
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descr
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gcc-2.95.3 does generates wrong code on optimization
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by gcc -O2 (-fgcse), and adb_read_date_time() returns
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wrong value on cuda system.
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A null asm statement has been added to avoid this for workaround.
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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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port vax
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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 egcs-pc532-ip6_mroute
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cdate 09 Jul 2002
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who simonb
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port pc532
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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 SuperH SH5 Toolchain Bugs
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cdate 11 Jul 2002
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who scw
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port sh5
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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 vax Toolchain bug
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cdate 28 Mar 2003
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who he
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port vax
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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 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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port all
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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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