path: root/doc/HACKS

# $NetBSD: HACKS,v 1.3 2003/01/23 10:39:21 dmcmahill 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 2.95.3/alpha -O2 bug
cdate	Thu Jan 23 15:42:57 UTC 2003
who	dmcmahill
port	alpha
file	mail/imap-uwwm/Makefile : 1.52
descr
	Compiler crashes
kcah

hack	gcc 2.95.3/alpha c++ -O2 bug
cdate	Fri Aug 16 06:38:16 EDT 2002
who	dmcmahill
port	alpha
file	print/cjk-lyx/patches/patch-ab : 1.2
file	print/cjk-lyx/patches/patch-ad : 1.1
file	print/cjk-lyx/patches/patch-ae : 1.1
file	print/cjk-lyx/patches/patch-af : 1.1
descr
	Assembler runs forever and never returns with -O2 on some files.
kcah

hack	gcc 2.95.3/alpha -O2 bug
cdate	Sun Aug 11 12:39:46 EDT 2002
who	dmcmahill
port	alpha
file	wm/flubox/patches/patch-ab : 1.3
descr
	Assembler runs forever and never returns with -O2 on some files.
kcah

hack	gcc 2.95.3/m68k -O2 bug
cdate	Fri Jul 19 04:33:29 UTC 2002
who	fredb
port	mac68k, amiga
file	graphics/gdk-pixbuf/patches/patch-aa : 1.3
descr
	pixops.c gives 'Internal compiler error' with -O2 (but not -O),
	on m68k only. The exact error message is reproduced in the patch.
kcah

hack	gas 2.11.2 commutative constraint bug
cdate	Fri May 10 04:51:29 UTC 2002
who	fredb
port	mac68k
file	devel/gmp/patches/patch-aa : 1.7
descr
	The __asm__() in longlong.h fails to assemble on m68k with an
	"unrecognized instruction" error, unless the commutative
	constraint ('%') is removed (which makes it *more* constrained).
kcah

hack	gcc 2.95.3 -O2 bug
cdate	Thu Apr 18 15:42:57 UTC 2002
who	fredb, dmcmahill
port	alpha, mac68k
file	print/lyx/patches/patch-ab : 1.2
file	print/lyx/patches/patch-ac : 1.1
file	print/lyx/patches/patch-ae : 1.1
descr
	lyxfunc.C causes 'Internal compiler error' with -O2 (but not -O).
	The exact error message is reproduced in the patch.
	Various other files cause the assembler to run forever (well,
	I gave up after several hours) on netbsd-1.5.3/alpha using
	gcc-2.95.3 and -O2.
kcah

hack	cc -O* bug
mdate	29 Dec 2001
who	abs
port	arm32
file	audio/libvorbis/Makefile : 1.12 : 20 : 28
descr
	floor1.c causes Internal compiler error with egcs-2.91.66 19990314
	(shipped with 1.5.2)
kcah

hack	cc -O* bug
mdate	10 Oct 2001
who	abs
port	arm32
file	net/djbdns/Makefile : 1.14 :
descr
	various files go into infinite loop if optimisation enabled in 
	egcs-2.91.66 19990314 (shipped with 1.5.2)
kcah

hack	cc -O* bug
mdate	03 Oct 2001
who	abs
port	arm32
file	net/ucspi-tcp/Makefile	: 1.7 :
descr
	various files go into infinite loop if optimisation enabled in 
	egcs-2.91.66 19990314 (shipped with 1.5.2)
kcah

hack	cc -O* bug
mdate	23 Aug 2001
who	abs
port	sparc64
file	graphics/tiff/patches/patch-aa	: 1.3 : 52 : 58
descr
	on tif_dirread.c -O[12] causes the compiler to abort
kcah

hack	cc -O* bug
cdate	08 Nov 2000
mdate	10 Jan 2002
who	abs
port	arm32 arm
file	benchmarks/lmbench/patches/patch-aa	: 1.2 :
file	benchmarks/lmbench/Makefile		: 1.9 :
descr
	on certain c files, using -O[1-3] will cause the arm32 cc1 to run
	forever.  
	reported to GCC people as PR optimization/2391.
kcah

hack	cc -O* bug
mdate	18 May 2001
who	abs
file	x11/xscreensaver/distinfo		: 1.2 :
file	x11/xscreensaver/patches/patch-ab	: 1.7 :
descr
	on distort.c -O[12] causes the compiler to abort
kcah

hack	c++ -O* bug
mdate	02 Jun 2000
who	dmcmahill
file	audio/festival/patches/patch-ai		: 1.2 : 
file	audio/festival/patches/patch-aj		: 1.1 :
file	audio/festival/patches/patch-ak		: 1.1 :
file	audio/festival/patches/patch-al		: 1.1 :
file	cad/verilog/patches/patch-ad		: 1.3 :
file	cad/verilog-current/patches/patch-ad	: 1.3 :
file	cad/vipec/patches/patch-ac		: 1.4 :
file	emulators/stella/patches/patch-ac	: 1.3 : 36 : 43
file	graphics/kdegraphics/patches/patch-af	: 1.5 
file	graphics/xpdf/Makefile			: 1.18: 27
file	graphics/xpdf/patches/patch-aa		: 1.3 
file	math/yacas/patches/patch-ac		: 1.1.1.1 :
file	x11/glclock/Makefile			: 1.3 : 18 : 20 
file	x11/windowmaker/Makefile			: 1.51 : 39 : 42 
pr	9453
descr
	on certain c++ files, using -O[1-3] will cause cc1plus to run
	forever.  On other files, c++ -O[1-3] will cause the assembler to run
	forever.  This problem is noted on pmax and sparc (NetBSD-1.4.*) with 
	gcc version egcs-2.91.60 19981201 (egcs-1.1.1 release) 

	evidently this problem also exists on arm32.
kcah

hack	mac68k-jade
mdate	29 Mar 2001
who	hubertf
port	mac68k
file	textproc/jade/patches/patch-aa:	1.1 : 1 : 999
descr
	jade on mac68k seems to dump core under certain conditions, the
	patch was sent in by "Kogule, Ryo" <kogule@mars.dti.ne.jp> via
	tech-pkg. The subject of the thread is "Jade doesn't work"
	It is suspected that the patch really works around a bug in the
	toolchain.
kcah

hack	perl5-base
mdate	12 Apr 2001
who	manu
port	all
Checking in perl5-base/patches/patch-ag: 1.2 : 1 : 999
descr
	The Xerces-Perl module is implemented as a shared object. It needs 
	some symbols from libgcc.a, such as __eh_alloc. It's not possible
	to link the xerces-P shared object with libgcc.a, because libgcc.a
	is not compiled with -fPIC. Hence we need to have the missing 
	symbols in the Perl executable. 
	This hack includes the whole libgcc.a in the Perl executable, and
	links with c++ so that some mandatory symbols such as __pure_virtual 
	are also included. It should go away with GCC-3.0, or if we make a
	libgcc.so on day.
kcah

hack	gcc-2.95.3 -O* bug
mdate	12 Feb 2002
who	mrauch
port	i386
file	devel/pth/Makefile	: 1.37 : 20 : 22
descr	
	OpenOffice segfaults after some time in the pthread library with a 
	completely thrashed stack. Removing optimization when building
	pth (-O0) avoids this problem. 
kcah

hack	binutils-2.11.2 ld versioned symbols bug
cdate 	26 Feb 2002
who	mrauch
file	misc/openoffice/patches/patch-dj
file	misc/openoffice/patches/patch-dk
descr	Using versioned symbols the special symbol _etext can end up
	in the shared library with a junk value for the version string
	instead of "0" for no version. Sometimes it is sufficient to 
	reorder the -l flags on the link line but the general hack is to
	disable versioned symbols.
kcah

hack	sparc64-kth-krb
cdate	29 Mar 2002
who	hubertf
file	security/kth-krb4/Makefile
descr	This package hangs when compiling one of the files with the
	compiler that comes with 1.5ZC. The compiler needs to be killed
	manually - the package is marked as interactive on sparc64 for
	that reason.
kcah

hack	cc -O* bug
mdate	04 Jun 2002
who	cjep
port	arm
file	net/ucspi-tcp/Makefile	: 1.11 :
descr
	some compilations go into infinite loop if optimisation enabled in 
	gcc-2.95.3 20010315 (release) (NetBSD nb2) as shipped with
	a releng snapshot (May 31st) of NetBSD-1.6_BETA1. See also abs's
	entry above. First hang at:
	( ( ./compile tryulong32.c && ./load tryulong32 &&  ./tryulong32 ) \
	>/dev/null 2>&1  && cat uint32.h2 || cat uint32.h1 ) > uint32.h
kcah

hack	cc -O* bug
mdate	04 Jun 2002
who	cjep
port	arm
file	net/djbdns/Makefile : 1.19 :
descr
	various files go into infinite loop if optimisation enabled in 
	gcc-2.95.3 20010315 (release) (NetBSD nb2) as shipped with
	a releng snapshot (May 31st) of NetBSD-1.6_BETA1. See also abs's
	entry above. First hang as ucspi-tcp.
kcah

hack	cc -O* bug
mdate	06 Jun 2002
who	cjep
port	arm
file	emulators/stella/Makefile : 1.5 :
descr
	Usual arm optimisation problem. The first problem is at:
	c++ -c -O2 -fno-rtti -I. -I../emucore -I../emucore/m6502/src    \
	-I../emucore/m6502/src/bspf/src -I../ui/x11 -I../ui/sound       \
	-I/usr/X11R6/include -DBSPF_UNIX ../emucore/m6502/src/M6502.cxx 
kcah

hack	cc -O* bug
mdate	07 Jun 2002
who	cjep
port	arm
file	databases/cdb/Makefile : 1.3 :
descr
	Usual arm optimisation problem. The first problem occurs around
	( cat warn-auto.sh;  echo exec "`head -1 conf-cc`" '-c ${1+"$@"}'  \
	) > compile
	chmod 755 compile
kcah

hack	gcc 2.95.3 -O2 bug
mdate	22 Jun 2002
who	jlam
port	sparc64
file	x11/openmotif/patches/patch-ap : 1.2 : 209
pr	15477
descr
	With -O2 optimization, a "if {} else if {} else {}" C statement
	isn't converted into the correct code.
kcah

hack	cc -O* bug
mdate	28 Nov 2002
who	agc
port	arm
file	emulators/simh/Makefile : 1.3 :
descr
	Usual arm optimisation problem. The first problem occurs around
	compilation of altairz80
kcah