# $NetBSD: HACKS,v 1.237 2023/07/07 08:39:23 rin 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 llvm needs no-unused-command-line-argument
mdate 10 May 2020
who maxv
file share/mk/bsd.lib.mk 1.380 -> 1.381
descr
To avoid LLVM warnings when compiling the kernel with special
CFLAGS such as KASAN on amd64 or ARMV83_PAC on aarch64, pass
-Wno-unused-command-line-argument.
kcah
hack static linking with libpthread
mdate 7 May 2019
who maya
file src/lib/libpthread/Makefile 1.92 -> 1.94
descr
To avoid some libc thread stub functions being picked up
in static builds, link pthread as one section.
kcah
hack disable optimization for gcc-9.3 in src/lib/libc/gdtoa/strtod.c
mdate 18 Sep 2020
who christos
file src/lib/libc/gdtoa/strtod.c 1.15 -> 1.16
descr
See PR/55668, the program there causes infinite loop
kcah
hack gcc-5.3 optimizes memset+malloc -> calloc inside calloc
mdate 4 May 2016
who christos
file external/gpl2/lib/libmalloc/lib/Makefile 1.3 -> 1.5
descr
resulting in infinite recursion; we prevent this with
-fno-builtin-malloc
kcah
hack turn off tree-vrp for parts of ufs_lookup.c
mdate 28 April 2016
who mrg christos
file src/sys/ufs/ufs/ufs_lookup.c : 1.144
pr 51094
descr
with -ftree-vrp enabled in ufs_lookup.c sometimes bad dir
panicks are see.
hcah
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 : 1.20
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 gcc4 wrong uninitialized variable
mdate 10 May 2006
who mrg
file bin/ksh/eval.c : 1.6
file bin/sh/histedit.c : 1.39
file bin/sh/parser.c : 1.60
file crypto/dist/heimdal/kdc/524.c : 1.10
file crypto/dist/ssh/sftp.c : 1.20
file crypto/dist/ssh/ssh-keysign.c : 1.11
file dist/ipf/lib/hostname.c : 1.2
file dist/ipf/tools/ipmon.c : 1.8
file dist/ntp/ntpd/ntp_request.c : 1.4
file dist/ntp/ntpd/refclock_shm.c : 1.4
file dist/ntp/sntp/timing.c : 1.3
file dist/pppd/pppstats/pppstats.c : 1.3
file dist/tcpdump/print-zephyr.c : 1.5
file distrib/utils/sysinst/aout2elf.c : 1.12
file gnu/libexec/uucp/uucico/uucico.c : 1.6
file lib/libc/citrus/citrus_csmapper.c : 1.6
file lib/libc/citrus/citrus_pivot_factory.c : 1.5
file lib/libc/inet/inet_cidr_ntop.c : 1.3
file lib/libc/inet/inet_ntop.c : 1.3
file lib/libc/stdio/vfwprintf.c : 1.8
file libexec/ld.elf_so/arch/m68k/mdreloc.c : 1.20
file libexec/ld.elf_so/arch/powerpc/ppc_reloc.c : 1.40
file libexec/ld.elf_so/arch/sh3/mdreloc.c : 1.22
file libexec/ld.elf_so/arch/sparc/mdreloc.c : 1.39
file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39
file libexec/ld.elf_so/arch/vax/mdreloc.c : 1.21
file libexec/ld.elf_so/arch/x86_64/mdreloc.c : 1.27
file sbin/fsck_ext2fs/dir.c : 1.19
file sbin/routed/rtquery/rtquery.c : 1.18
file sys/arch/amd64/amd64/pmap.c : 1.26
file sys/arch/i386/pci/piixpcib.c : 1.4
file sys/arch/m68k/m68k/pmap_motorola.c : 1.4
file sys/crypto/cast128/cast128.c : 1.9
file sys/ddb/db_command.c : 1.86
file sys/dev/cardbus/cardbus_map.c : 1.21
file sys/dev/fss.c : 1.25
file sys/dev/ic/igsfb.c : 1.39
file sys/dev/ic/mb86950.c : 1.5
file sys/dev/ic/midway.c : 1.71
file sys/dev/kttcp.c : 1.18
file sys/dev/rasops/rasops_bitops.h : 1.9
file sys/dev/pci/cmpci.c : 1.31
file sys/dev/pci/machfb.c : 1.45
file sys/dev/usb/ohci.c : 1.174
file sys/dev/usb/uhci.c : 1.196
file sys/dev/rasops/rasops_bitops.h : 1.9
file sys/dist/ipf/netinet/ip_nat.c : 1.10
file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8
file sys/dist/pf/net/pf.c : 1.22
file sys/fs/udf/udf_vnops.c : 1.4
file sys/kern/kern_sig.c : 1.219
file sys/kern/tty.c : 1.181
file sys/net/bpf.c : 1.116
file sys/net/zlib.c : 1.26
file sys/netccitt/if_x25subr.c : 1.37
file sys/netinet/in.c : 1.107
file sys/nfs/nfs_serv.c : 1.108
file sys/nfs/nfs_socket.c : 1.129
file sys/nfs/nfs_syscalls.c : 1.91
file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)]
file usr.bin/ftp/ftp.c : 1.140
file usr.bin/find/function.c : 1.54
file usr.bin/mail/tty.c : 1.20
file usr.bin/msgc/msg_sys.def : 1.33-1.34
file usr.bin/nl/nl.c : 1.7
file usr.bin/systat/keyboard.c : 1.23
file usr.bin/usbhidctl/usbhid.c : 1.29
file usr.bin/vi/cl/cl_read.c : 1.5
file usr.bin/vi/ex/ex_cscope.c : 1.12
file usr.bin/vi/ex/ex_tag.c : 1.19
file usr.bin/vi/vi/v_txt.c : 1.15
file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4
file usr.sbin/cron/do_command.c : 1.19
file usr.sbin/timed/timed/slave.c : 1.15
descr
GCC 4.1 gets many uninitialised variable warnings wrong. We should
really audit all the old hacks like this when older compilers are
removed from the tree, as many are probably no longer required.
The problem is that it does not recognize initialization via function
call pointer. I.e.
int p;
foo(&p);
does not mark p as initialized.
kcah
hack gcc4 pointer sign and strict aliasing problems
mdate 10 May 2006
who mrg
file bin/ed/Makefile : 1.33
file distrib/utils/sysinst/Makefile.inc : 1.44
file distrib/utils/x_dhclient/Makefile : 1.15
file games/bcd/Makefile : 1.5
file games/dab/Makefile : 1.5
file games/larn/Makefile : 1.17
file games/pom/Makefile : 1.5
file lib/libasn1/Makefile : 1.26
file lib/libcrypt/Makefile : 1.17
file lib/libgssapi/Makefile : 1.16
file lib/libhdb/Makefile : 1.20
file lib/libkadm5clnt/Makefile : 1.21
file lib/libkadm5srv/Makefile : 1.25
file lib/libkrb5/Makefile : 1.35
file lib/libssh/Makefile : 1.6
file lib/libtelnet/Makefile : 1.26
file libexec/getty/Makefile : 1.14
file libexec/kadmind/Makefile : 1.19
file libexec/kpasswdd/Makefile : 1.14
file sbin/atactl/Makefile : 1.3
file sbin/cgdconfig/Makefile : 1.7
file sbin/clri/Makefile : 1.13
file sbin/dkctl/Makefile : 1.4
file sbin/dump/Makefile : 1.33
file sbin/fdisk/Makefile : 1.35
file sbin/fsck_ext2fs/Makefile : 1.11
file sbin/fsck_ffs/Makefile : 1.29
file sbin/fsdb/Makefile : 1.18
file sbin/newfs/Makefile : 1.30
file sbin/newfs_sysvbfs/Makefile : 1.2
file sbin/restore/Makefile : 1.23
file sbin/veriexecctl/Makefile : 1.11
file sys/lib/libsa/Makefile : 1.59
file sys/arch/evbarm/adi_brh/brh_machdep.c : 1.24
file usr.bin/awk/Makefile : 1.9
file usr.bin/crontab/Makefile : 1.24
file usr.bin/ctags/Makefile : 1.8
file usr.bin/gzip/Makefile : 1.10
file usr.bin/ssh/sftp/Makefile : 1.10
file usr.bin/ssh/ssh/Makefile : 1.25
file usr.bin/vi/build/Makefile : 1.26
file usr.bin/telnet/Makefile : 1.40
file usr.bin/tn3270/tn3270/Makefile : 1.36
file usr.bin/tr/Makefile : 1.4
file usr.sbin/amd/amd/Makefile : 1.27
file usr.sbin/amd/amq/Makefile : 1.14
file usr.sbin/amd/libamu/Makefile : 1.20
file usr.sbin/amd/pawd/Makefile : 1.5
file usr.sbin/bind/Makefile.inc : 1.22
file usr.sbin/bind/libdns/Makefile : 1.3
file usr.sbin/bind/named/Makefile : 1.17
file usr.sbin/bootp/bootptest/Makefile : 1.2
file usr.sbin/chrtbl/Makefile : 1.6
file usr.sbin/cron/Makefile : 1.12
file usr.sbin/dhcp/Makefile.inc : 1.20
file usr.sbin/hprop/Makefile : 1.13
file usr.sbin/installboot/Makefile : 1.35
file usr.sbin/ipf/ipftest/Makefile : 1.32
file usr.sbin/isdn/isdnd/Makefile : 1.6
file usr.sbin/isdn/isdnmonitor/Makefile : 1.3
file usr.sbin/isdn/isdntel/Makefile : 1.2
file usr.sbin/isdn/isdntrace/Makefile : 126
file usr.sbin/mopd/common/Makefile : 1.10
file usr.sbin/mopd/mopd/Makefile : 1.9
file usr.sbin/mopd/mopprobe/Makefile : 1.7
file usr.sbin/makefs/Makefile : 1.17
file usr.sbin/mscdlabel/Makefile : 1.5
file usr.sbin/pkg_install/add/Makefile : 1.7
file usr.sbin/pkg_install/create/Makefile : 1.5
file usr.sbin/pkg_install/lib/Makefile : 1.28
file usr.sbin/ntp/ntpd/Makefile : 1.10/1.11
file usr.sbin/ntp/ntptime/Makefile : 1.4/1.5
file usr.sbin/pppd/Makefile.inc : 1.3
file usr.sbin/pppd/pppd/Makefile : 1.38
file usr.sbin/rarpd/Makefile : 1.10
file usr.sbin/rbootd/Makefile : 1.10
file usr.sbin/rpc.pcnfsd/Makefile : 1.17
file usr.sbin/tcpdump/Makefile : 1.42
descr
GCC 4.1 warns on pointer sign comparison/assignments and lots of
code does not conform. For now we use -Wno-pointer-sign and
-fno-strict-aliasing.
kcah
hack disable ctf for gcc-4.8 build
mdate April 3 2014
who christos
file external/gpl3/gcc/usr.bin/Makefile.frontend : 1.4
file external/gpl3/gcc/usr.bin/Makefile.backend : 1.5
descr
nbctfconvert -g -L VERSION -g fold-const.o
ERROR: fold-const.c: failed to get mapping for tid 79154 \
((null)) <13532>
kcak
hack emacs aborting on exit (libgcc issue)
mdate 7 November 2011
who christos
file external/gpl3/gcc/dist/gcc/unwind-dw2-fde.c : 1.2
descr
GCC 4.5.3 now calls __unregister_frame_info_bases() on unloading/exit
to do just that. If the symbol requested is not found, then it aborts.
emacs 23.3 triggers this assertion. For now disable aborting, and
silently ignore.
kcah
hack cross-building hack on Darwin
mdate 20 July 2008
who agc
file src/distrib/common/Makefile.mdset : 1.33
descr
Darwin has problems with getopt() when used in mdsetimage -v,
due to the difference between BSD and libiberty() getopt
implementations, more fully described in
http://mail-index.netbsd.org/current-users/2008/06/27/msg003242.html
and the subsequent thread. For just now, we just have an ugly
workaround not to call mdsetimage with the -v argument on Darwin
kcah
hack avoid rebuilding asn1 libraries
mdate 03 August 2008
who veego
file src/crypto/dist/heimdal/lib/asn1/gen.c : 1.10
file src/lib/libasn1/Makefile : 1.32
file src/lib/libhdb/Makefile : 1.23
file src/lib/libgssapi/Makefile : 1.20
file src/lib/libhx509/Makefile : 1.3
pr 9702 39185
descr
asn1_compile does not check if generated header files do not have to
be rebuild.
Generate .hx files and copy it in the Makefiles if they changed.
kcah
hack Disable fortification for /usr/bin/makeinfo
cdata 24 Mar 2014
who tron
file src/external/gpl2/texinfo/bin/makeinfo/Makefile : 1.1
pr N/A
descr
If "makeinfo" is compiled with "-D_FORTIFY_SOURCE=2" using GCC 4.8.3
it fails to process certain texinfo files, e.g. "cl.texi"
included in the Emacs 24.3 distribution.
kcah
hack Disable Stack Smash Protection for /usr/X11R7/bin/xauth
cdata 05 Apr 2014
who tron
file src/external/mit/xorg/bin/xauth/Makefile : 1.4
pr N/A
descr
If "xauth" is compile with "USE_SSP" set to "yes" it fails
mysteriously with an error message like this:
/usr/X11R7/bin/xauth: file /foo/bar/.Xauthority does not exist
/usr/X11R7/bin/xauth: unable to link authority file /foo/bar/.Xauthority, use /foo/bar/.Xauthority
The compiler seems to get confused about the two filename variables
used in the link(2) system call.
kcah
hack g++ 5.x barfs on volatile in constexpr initializers
cdata 27 Aug 2015
who pooka
file src/lib/libpthread/pthread_types.h : 1.17
pr lib/49989
descr
Trying to use e.g. pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER
in C++ results in:
error: temporary of non-literal type '__pthread_mutex_st'
in a constant expression
constexpr mutex() _NOEXCEPT : __m_(PTHREAD_MUTEX_INITIALIZER) {}
[...]
include/pthread_types.h:101:8: note: '__pthread_mutex_st' is
not literal because:
struct __pthread_mutex_st {
^
include/pthread_types.h:103:17: note: non-static data
member '__pthread_mutex_st::ptm_errorcheck' has volatile type
pthread_spin_t ptm_errorcheck;
kcah
hack libm cabs{,f,l} and g++
cdata 11 Jan 2016
who christos
pr lib/50646
file src/external/gpl3/gcc.old/dist/libstdc++-v3/include/std/complex : 1.2
file src/external/gpl3/gcc/dist/libstdc++-v3/include/std/complex : 1.2
descr
Our cabs and cabsf have a different argument format on some architectures
and for that we have created in libm/compat_cabs{,f}.c. The standard
versions in libc are __c99_cabs{,f,l} and there are __RENAME()'s in
<complex.h>. G++ uses __builtin_cabs{,f,l} to implement those and they
translate by default to cabs{,f,l} which gets defined to cabs{,f} (the
wrong function) and an undefined cabsl. I've changed <complex> to use
the __c99_cabs{,f,l} directly. Using the __builtin_cabs{,f,l} in gcc is
still broken.
kcah
port vax
hack gcc10/vax ICE
cdate Sun Jan 22 15:37:56 EST 2023
who christos
file external/mit/xorg/lib/fontconfig/src/Makefile : 1.28
descr
Disable optimization on some files
kcah
hack gcc4/vax ICE
cdate Sat Dec 22 08:17:57 2007 UTC
who tsutsui
file sys/arch/vax/conf/Makefile.vax : 1.79
descr
GCC4 on vax gets ICE on compiling sys/ddb/db_command.c.
-fno-tree-ter prevents it so add it to COPTS.
kcah
hack gcc4/vax compiler crash
cdate Fri Jun 30 22:39:12 PDT 2006
who mrg
file bin/csh/Makefile : 1.27
file lib/i18n_module/UTF7/Makefile : 1.2
descr
GCC4 on vax crashes. -O0 stops it happening so far...
kcah
hack declare boolean_t in two IPF user-mode programs
cdate Tue Mar 7 19:19:20 CET 2006
who he
file dist/ipf/ipsend/iptests.c : 1.8
dist/ipf/ipsend/sock.c : 1.7
descr
The IPF user-mode programs ipsend and iptest first
include <sys/types.h> without _KERNEL defined, and
later include <sys/file.h> with _KERNEL defined.
This causes a build failure when building for vax,
since <sys/device.h> ends up being included without
bollean_t being defined by <sys/types.h>.
Build failure and further details documented in
PR#32907.
kcah
hack pcc 0.9.9 large string literals
cdat 8 July 2008
who gmcgarry
file sys/conf/param.c : 1.58
descr
Workaround for pcc 0.9.9 not handling large string literals
which causes kernels with 'options INCLUDE_CONFIG_FILE' to
fail compilation.
There is a proposal on the pcc mailing list to stuff config
file in ELF section.
kcah
hack xorg warnings
cdat 30 July 2008, 3 June, 2013
who mrg
file external/mit/xorg/lib/libSM/Makefile : 1.2
external/mit/xorg/lib/libX11/Makefile.libx11 : 1.10
external/mit/xorg/lib/libXext/Makefile : 1.2
external/mit/xorg/lib/libXfont/Makefile : 1.2
descr
Disable several warnings or use -Wno-error across Xorg sources
while we get them working
kcah
hack 32 bit time leftovers
cdat 11 January 2009
who christos
file lib/libc/time/localtime.c : 1.41
lib/libc/time/zic.c : 1.23
descr
The timezone compiled files still contain 32 bit time_t
quantities. I did not want to version the files because
the ``parser'' is too ugly for words. What needs to be
done, is to rewrite the parser from scratch also to avoid
potential core-dumps from parsing invalid files.
kcah
hack 32 bit time leftovers
cdat 11 January 2009
who christos
file various
descr
Many filesystem on-disk formats have 32 bit times.
kcah
hack gcc 4.5 fsdb miscompile
date Sat Nov 9 11:03:02 EST 2013
who christos
file src/sbin/fsdb/Makefile : 1.36 (and earlier)
descr
src/sbin/fsdb/fsdb.c: In function 'findblk':
src/sbin/fsdb/fsdb.c:610:1: error: unrecognizable insn:
(insn 941 940 942 134 src/sbin/fsdb/fsdb.c:589 (set (reg:SI 604)
(subreg:SI (mem/s/j:DI (plus:SI (mult:SI (reg:SI 602)
(const_int 8 [0x8]))
(reg/f:SI 601)) [0 curinode.99_378->dp2.di_ib S8 A32]) 4)) \
-1 (nil))
src/sbin/fsdb/fsdb.c:610:1: internal compiler error: in \
extract_insn, at recog.c:2103
kcah
hack gcc 4.8 gcc miscompiles
date Sat Nov 9 16:35:18 EST 2013
who christos
file distrib/utils/x_ping/Makefile : 1.8
file distrib/vax/miniroot/Makefile.inc : ?
file distrib/vax/ramdisk/Makefile : ?
file external/gpl3/gdb/lib/libdecnumber/Makefile : 1.3
file sbin/fsdb/Makefile : 1.36
file sbin/newfs_ext2fs/Makefile : 1.6
file sbin/ping/Makefile : 1.17
file usr.sbin/mtrace/Makefile : 1.11
descr
external/gpl3/gcc/dist/gcc/expmed.c:2781:1:
internal compiler error: in change_address_1, at emit-rtl.c:2019
external/gpl3/gcc/dist/gcc/recog.c:770:1:
internal compiler error: in change_address_1, at emit-rtl.c:2019
external/gpl3/gcc/dist/libdecnumber/decNumber.c:7214:3:
internal compiler error: in change_address_1, at emit-rtl.c:2019
sbin/ping/ping.c:679:1:
internal compiler error: in change_address_1, at emit-rtl.c:2019
sbin/newfs_ext2fs/mke2fs.c:681:1:
internal compiler error: in reload_combine_note_use,
at postreload.c:1561
external/gpl3/gdb/dist/libdecnumber/decNumber.c:7214:3:
internal compiler error: in change_address_1, at emit-rtl.c:2019
usr.sbin/mtrace/mtrace.c:1655:1:
internal compiler error: in change_address_1, at emit-rtl.c:2019
kcah
hack gcc 5.4 cc1 miscompile
date Tue Feb 14 07:19:57 JST 2017
who rin
pr port-vax/51967
file external/gpl3/gcc/usr.bin/backend/Makefile : 1.35
descr
cc1 aborts due to SIGILL when compiling the sample code attached
to the PR. As a workaround, compile dse.c with -O0.
kcah
hack libssh miscompile
cdate Tue Feb 14 17:58:06 JST 2017
mdate Tue Feb 14 18:57:39 JST 2017
who rin
file crypto/external/bsd/openssh/lib/Makefile : 1.20
descr
poly1305.c and umac.c are miscompiled, which results in login
failure to/from external hosts via ssh.
kcah
hack mandoc miscompile
date Tue Feb 14 18:03:05 JST 2017
who rin
file external/bsd/mdocml/lib/libmandoc/Makefile : 1.8
descr
mandoc(1) receives SIGILL in in_line_argn() from mdoc_macro.c.
kcah
hack libX11 miscompile
date Thu Feb 16 10:00:22 JST 2017
who rin
file src/external/mit/xorg/lib/libX11/Makefile.libx11 : 1.18
descr
lcWrap.c is miscompiled, which results in input failure via XIM.
Besides, some clients, e.g., pkgsrc/x11/kterm, receive SIGSEGV.
kcah
hack gomoku compiler crash
date Tue May 31 15:11:39 EDT 2022
who christos
file src/games/gomoku/Makefile : 1.12
descr
pickmove.c crashes with -O2, warns about ovi.o_intersect being
unitialized with -O1, works with -O0
kcah
hack gdtoa/misc.c miscompile
cdate Sun Dec 4 22:27:26 UTC 2022
who jakllsch
file src/lib/libc/gdtoa/Makefile.inc : 1.11
descr
some doubles print as garbage if gdtoa/misc.c isn't compiled at -O0
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/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-4.5 arm CNAME hostname lookup failure on
certain DNS environment (probably -ftree-ter problem)
cdate Sat Dec 24 04:59:00 UTC 2011
mdate
who tsutsui
file lib/libc/net/Makefile.inc 1.79
descr Hostname lookup against CNAMEs by some commands fails
on certain DNS environments if lib/libc/net/gethnamaddr.c
(ping(8) etc) and lib/libc/net/getaddrinfo.c (ftp(1) etc)
are compiled with -O2, even though nslookup(1) against
the same CNAME returns proper hostname.
They works properly if compiled with -O2 -fno-tree-ter.
Also -O2 fails but -O2 -fno-tree-ter works on the following
test case in gcc bugzilla:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48863#c4
kcah
port sh3
hack gcc4-sh3-bz2
cdate Sun May 21 03:34:57 UTC 2006
mdate Fri May 16 13:13:00 UTC 2008
who mrg, tsutsui
file lib/libbz2/Makefile : 1.10
descr
The in-tree GCC 4.1-based compiler generated too-far
pc-relative addresses. Hack is to build with
-fno-loop-optimize.
kcah
port m68000
hack gcc4-m68000
cdate Fri Feb 8 10:29:37 PST 2008
mdate Sun May 4 15:37:19 UTC 2008
who mrg, tsutsui
file rescue/Makefile : 1.21
file sbin/dump_lfs/Makefile : 1.9
file sbin/fsck_ffs/Makefile : 1.35
file sbin/fsdb/Makefile : 1.22
file share/mk/sys.mk : 1.96
file usr.sbin/ndbootd/Makefile : 1.5
descr
Several internal compiler errors with gcc -O1
around 64bit integer arithmetic.
This hack uses -O1 and adds some -fno-tree-foo options
to avoid the problem.
This might be related with GCC Bugzilla Bug 32424.
kcah
port m68k,sh3,vax
hack gcc-4.8.1
cdate Wed Nov 6 20:41:35 EST 2013
who christos
file src/external/gpl3/gcc/libstdc++-v3/Makefile : 1.6
descr
compile hashtable_c++0x.cc with -O2 instead of -Os to
produce missing instantiation of std::lower_bound expansion
for unsigned long.
kcah
port sparc
hack avoid NULL pointer derefs in savefpstate IPIs and GCC 4.5.3
cdate Sun Aug 14 19:26:48 PDT 2011
who mrg
file sys/arch/sparc64/sparc/cpu.c : 1.234
file sys/arch/sparc64/sparc/cpuvar.h : 1.90
file sys/arch/sparc64/sparc/genassym.cf : 1.67
file sys/arch/sparc64/sparc/locore.s : 1.265
descr
Something is wrong with GCC 4.5.3 and the savefpstate IPI.
Post newlock2 there was a bug where a lock was reduced from
IPL_SCHED to IPL_VM (?) and occasionally savefpstate IPI
would crash due to NULL IPI. This was fixed by re-using the
right IPL value. However, GCC 4.5.3 build kernels have the
same problems. For now, the hack is re-instated.
kcah
port mips
hack mips-shared-linker-load-address
cdate Fri Oct 7 08:33:10 UTC 2005
who simonb
file src/sys/kern/exec_elf32.c : 1.107
descr
With COMPAT_16 or previous enabled (which enables
ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will
load and run at address 0. The check to fix this in
rev 1.107 only checks the first psection of the ELF
executable, which may not be loadable. A more correct
fix is to check the first loadable psection instead of
just the first psection.
kcah
hack mips-duplicate-ras-end-label
cdate Sat Sep 2 23:29:42 2006
who martin
file src/regress/sys/kern/ras/ras3/Makefile : 1.3
descr
Add -fno-reorder-blocks to CFLAGS to avoid duplicate
labels by duplicated __asm output from RAS_END()
macro.
kcah
hack mips-mcount-assembler-warning
cdate Tue Jul 29 14:16:52 UTC 2008
who lukem
file src/lib/libc/gmon/Makefile.inc : 1.8
descr
Workaround for PR port-mips/39192.
common/lib/libc/gmon/mcount.c generates a (fatal)
assembler warning on MIPS:
Warning: No .cprestore pseudo-op used in PIC code
Add COPTS.count.c+=-Wa,--no-warn to avoid -Wa,--fatal-warnings
kcah
hack mips-use-binutils-old
cdate Sun May 7 14:28:55 CEST 2023
who martin
file src/share/mk/bsd.own.mk : 1.1311, 1.1308
descr
Use binutils.old for 64bit mips with 32bit userland.
Version 2.39 causes random (cross-) build failures
that are hard to reproduce or analyze.
kcah
port i386
hack use volatile intermediate variable to enforce rounding
cdate Tue Aug 1 22:15:55 MEST 2006
who drochner
file src/lib/libm/src/lrintf.c : 1.4
file src/lib/libm/src/s_rintf.c : 1.8
descr
gcc-4 does subsequent operations on "float" values within
the i387 FPU without rounding the intermediate results
kcah
port x86
hack turn off optimization for biosdisk_ll.c because otherwise
we are pass the wrong arguments to biosdisk_read().
$ cd /usr/src/sys/arch/i386/floppies/bootflopp-com
$ qemu-system-i386 -nographic -fda boot-com1.fs -boot a
cdate Mon Apr 7 21:09:55 2014 UTC
who christos
file src/sys/arch/i386/stand/lib/Makefile : 1.38
descr
Turning on DISK_DEBUG shows the problem. We should find
out which option is causing this.
hcah
port powerpc
hack avoid using __builtin_return_address(0) because it fails in
Xorg's module loader
cdate Sat Sep 27 03:52:05 UTC 2008
who macallan
file src/libexec/ld.elf_so/rtld.c : 1.121
descr
workaround for PR port-macppc/37812
kcah
hack define TARGET_SECURE_PLT and HAVE_AS_TLS because when
building the native compiler via build.sh those don't defined
properly.
cdate Sat Mar 12 08:00:00 UTC 2011
who matt
file src/gnu/dist/gcc4/gcc/config/rs6000/netbsd.h : 1.7
descr
see above
kcah
port powerpc64
hack include _errno.c in libposix so that __errno resolves. It
should resolve from libc's errno, but somehow it does not.
Linker bug?
cdate Thu Oct 27 13:19:47 EDT 2011
who christos
file src/lib/libposix/Makefile: 1.15
file src/lib/librt/Makefile: 1.14
descr
workaround for:
libposix_pic.a(cerror.pico)(.text+0x14): unresolvable \
R_PPC64_REL24 relocation against symbol `.__errno'
kcah
hack rename data() function in mdocml to avoid redefined error.
Compiler/Assembler bug?
cdate Sat Oct 29 11:16:01 EDT 2011
who christos
file src/external/bsd/mdocml/tbl_data.c: 1.2
descr
workaround for:
{standard input}: Assembler messages:
{standard input}:105: Error: symbol `.data' is already \
defined
kcah
port emips
hack Add nop between ctc1 and mtc0 to avoid assembler internal
error
cdate Sat Oct 29 16:57:34 EDT 2011
who christos
file src/sys/arch/mips/mips/mips_fpu.c: 1.7
descr
workaround for:
{standard input}: Assembler messages:
{standard input}:730: Internal error!
Assertion failure in append_insn at /usr/src/external/gpl3/\
binutils/dist/gas/config/tc-mips.c line 2910.
kcah
port ia64
hack libgcc unwind dummy function
cdate Fri Apr 17 14:31:03 CEST 2015
who martin
file src/external/gpl3/gcc/dist/libgcc/config/ia64/unwind-ia64.c: 1.4
descr
Add an empty _Unwind_FindTableEntry() implementation.
In the end we will use our libc stuff, and this should
go away again.
kcah
port x68k
hack compiler error with gcc 4.5.x
cdate Fri May 24 13:23:01 EDT 2013
who christos
file src/external/gpl3/gcc/usr.bin/bakend/Makefile: 1.17
xsrc/external/mit/xorg/lib/libGLU/Makefile: 1.11
descr
workaround for:
internal compiler error: in cselib_record_set, at cselib.c:1999
kcah
hack fallback to /usr/bin/clang-cpp in rpcgen
cdate Wed Jun 5 15:49:27 CEST 2013
who joerg
file src/usr.bin/rpcgen/rpc_main.c : 1.35
descr
It is undecided which compiler owns /usr/bin/cpp and whether it should
exist in a MKGCC=no world. To allow rpcgen to work out-of-the-box,
if either gcc or clang is installed, use /usr/bin/clang-cpp as fallback.
This applies only if RPCGEN_CPP is not set and /usr/bin/cpp is not executable.
kcah
port hppa
hack compiler error with gcc 4.5.x
cdate Tue Jul 23 07:42:28 BST 2013
who skrll
file src/sys/lib/libkern/Makefile.libkern: 1.26
descr
workaround for unanalysed codegen bug affecting md5c.c.
kcah
hack gdb vs _rtld_debug_state problem
cdate Thu Mar 5 09:49:53 UTC 2015
who skrll
file src/libexec/ld.elf_so/rtld.c: 1.175
descr
workaround for problem where gdb misses the breakpoint on
_rtld_debug_state when the function is only the
bv,n %r0(%rp) instruction - the nullify seems to
confuse something
kcah
port mips64*
hack compiler crashes on mips64* with optimization enabled
cdate Tue May 13 18:46:48 UTC 2014
who macallan
file src/external/lgpl3/gmp/lib/libgmp/arch/mips64eb/Makefile.inc: 1.6
src/external/lgpl3/gmp/lib/libgmp/arch/mips64eb/config.h: 1.5
src/external/lgpl3/gmp/lib/libgmp/arch/mips64el/Makefile.inc: 1.6
src/external/lgpl3/gmp/lib/libgmp/arch/mips64el/config.h: 1.5
descr workaround for n32 gcc doing unaligned 64bit accesses when optimizing
pr 48696
kcah
port vax
hack compile boot with -O1
cdate Sat May 24 09:40:58 CEST 2014
who martin
file src/sys/arch/vax/boot/boot/Makefile: 1.41
descr /boot does not work when compiled with -O2 and gcc 4.8
kcah
port vax
hack compile nir.c in gallium with -O1
cdate Mon Oct 28 14:39:35 EDT 2019
who christos
file /cvsroot/src/external/mit/xorg/lib/gallium/Makefile 1.36
descr gallium does not compile.
kcah
port sh3
hack compile parse.c in battlestar with -Wno-restrict
cdate Mon Oct 28 14:39:35 EDT 2019
who christos
file /cvsroot/src/games/battlestar/Makefile 1.11
descr fails to compile, confused by char words[][];
strcpy(words[n - 1], words[n + 1]);
kcah
port sh3
hack compile ddns.c in dhcpcd with no-stringop-overflow
cdate Tue Oct 29 20:25:59 EDT 2019
who christos
file /cvsroot/src/external/mpl/dhcp/bin/server/Makefile 1.2
descr fails to compile, confused by builtin_object_size in strcat(p, ".in..")
kcah
port arm
hack avoid using labels in a 12-bit constant.
cdate Mon Mar 30 05:26:47 2015 UTC
who matt
file crypto/external/bsd/openssl/lib/libcrypto/arch/arm/aes-armv4.S: 1.2
descr workaround for clang misassembling an instruction
kcah
port sparc64
hack during profiling with -m32 (and ASLR) labels are not generated
consistently
cdate Sat Feb 11 04:56:37 2017 UTC
who christos
file /cvsroot/src/crypto/external/bsd/heimdal/lib/libasn1/Makefile: 1.4
desc asn1_krb5_asn1.po does not produce the same results during successive
compilation runs; it is bimodal. Turning optimization to -O0 fixes
the issue
kcah
port ia64
hack ski emulator crashes
cdate Sat Apr 8 18:10:43 2017 UTC
who scole
file /cvsroot/src/sys/external/bsd/acpica/dist/tables/tbxfload.c: 1.6
desc
ski emulator crashes during acpi detection. Added a check for
uninitialized index. Submitted a request for change with upstream
mailing list, but never got a response
kcah
port vax
hack compile rtld.c with -O0
cdate Wed Apr 3 17:38:38 EDT 2019
who christos
file src/libexec/ld.elf_so/Makefile: 1.141
descr Disable optimization for rtld.c on the vax with gcc-7. Crashes on the
second pass loop with elm == 0xffffffff
kcah
port powerpc
hack compile tc.c, logerr.c, ubsan.c with -O0 for clang
cdate Wed Jan 29 17:40:19 EST 2020
who christos
file src/external/bsd/atf/lib/libatf-c/Makefile: 1.22
file src/external/bsd/dhcpcd/sbin/dhcpcd/Makefile: 1.49
file src/tests/lib/libc/misc/Makefile: 1.5
descr Disable optimization on tc.c, logerr.c, ubsan.c crashes:
lib/libLLVMCodeGen/../../llvm/../../external/apache2/llvm/lib/..\
/dist/llvm/include/llvm/CodeGen/MachineFrameInfo.h", line 495, \
function "__int64_t llvm::MachineFrameInfo::getObjectOffset(int) const"
kcah
port m68k
hack compile aes_ccm_tag() with -O0
cdate Mon Aug 10 06:27:29 UTC 2020
mdate Wed Aug 10 00:00:00 UTC 2022
who rin
file src/sys/crypto/aes/aes_ccm.c: 1.5
descr GCC 9.4 and 8.3 miscompile aes_ccm_tag() for m68k with optimization
level -O[12], which results in failure in aes_ccm_selftest().
For 9.4, -O0 and -O1 work but -O2 fails for amiga (A1200, 68060) and
mac68k (Quadra 840AV, 68040). Whereas -O0 and -O2 work but -O1 fails
for sun3 (TME, 68020 emulator) and sun2 (TME, 68010 emulator).
aes_ccm_selftest() still fails with GCC 10.4 and -O2.
kcah
port sh3
hack gcc9-sh3-lint
cdate Tue Jun 22 14:59:52 CEST 2021
mdate Mon Jul 5 12:34:57 CEST 2021
who hgutch
file external/gpl3/gcc/dist/gcc/config/sh/sh.md 1.2
external/gpl3/gcc.old/dist/gcc/config/sh/sh.md 1.11
descr
The in-tree gcc 9/gcc 10 crashes with an internal
invalid opcode exception when using any kind of
optimization on lex.c in usr.bin/xlint/lint . This
was introduced apparently unintendedly in gcc when
addressing a different issue. Rather than disabling
optimization for lex.c, instead revert the change to
gcc. The bug report upstream has been updated to
reflect the exact breakage.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101177
kcah
port sh3
hack compile lint1/initdecl() with -O0 for sh3 (port-sh3/56311)
cdate Thu Jul 15 07:58:05 UTC 2021
mdate Fri Jul 16 10:00:00 UTC 2021
who rin
file src/usr.bin/xlint/lint1/decl.c: 1.200
descr GCC 9 and 10 miscompile initdecl() due to mischoice of register,
as described in the PR. Compiling this function with -O0 works
around the problem.
The problem has been reported to upstream as GCC Bug 101469:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101469
kcah
port vax
hack compile blake2b.c with -O0 for vax
cdate Wed Oct 13 14:28:32 UTC 2021
mdate Wed Oct 13 14:28:32 UTC 2021
who nia
file src/lib/libcrypt/Makefile: 1.200
descr GCC 10 fails to build blake2b.c with an internal compiler
error unless optimization is disabled.
kcah
port arm
hack compile t_sig_backtrace with -fno-omit-frame-pointer for arm
cdate Tue Nov 23 23:24:37 UTC 2021
mdate Tue Nov 23 23:24:37 UTC 2021
who thorpej
file src/tests/lib/libexecinfo/Makefile: 1.8
file src/tests/lib/libexecinfo/t_sig_backtrace: 1.2
descr Unit test fails to pass unless t_sig_backtrace.c is compiled
with -fno-omit-frame-pointer and -DNOINLINE_HACK.
kcah
hack alpha gcc error in lint
cdate 2022/04/10 13:21:34
who martin
port alpha
file usr.bin/xlint/Makefile.inc: 1.23
pr 56789
descr
Compiling lint with -ftrapv fails with an internal
gcc compiler error.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105209
kcah
hack compile copy{in,out}() for ibm4xx with -O0 for clang
cdate Mon Sep 12 08:06:36 UTC 2022
who rin
port evbppc
file sys/arch/powerpc/ibm4xx/trap.c: 1.99
descr
clang 13.0.0 miscompiles copy{in,out}() with -O[12]. As a result,
kernel cannot execute /sbin/init.
kcah
hack Disable secure PLT for alpha
cdate Fri Jul 7 08:33:25 UTC 2023
who rin
port alpha
file src/external/gpl3/binutils/dist/bfd/elf64-alpha.c: 1.11
pr port-alpha/57511
descr
Temporally disable secure PLT support, introduced by
binutils 2.39 for us. We need its support to ld.elf_so(1).
kcah