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# $NetBSD: HACKS,v 1.98.2.1 2008/05/18 12:29:42 yamt 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 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
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 gcc-strict-aliasing
cdate 6 August 2004
who junyoung
pr 26516
file src/usr.sbin/racoon/racoon/Makefile : 1.21
descr
GCC issues a warning "dereferencing type-punned pointer will break
strict-aliasing rules" when compiling
crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this
is due to use of type casting in a non-standard way in the code and
not a compiler bug. Once a new release of KAME with a proper fix
applied is imported this should be backed out.
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/smbfs/lib/smb/rap.c : 1.6
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/netsmb/smb_smb.c : 1.27
file sys/netsmb/smb_trantcp.c : 1.22
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/mount_smbfs/Makefile : 1.4
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/dumplfs/Makefile : 1.11
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/rtadvd/Makefile : 1.9
file usr.sbin/tcpdump/Makefile : 1.42
file usr.sbin/wiconfig/Makefile : 1.3
descr
GCC 4.1 warns on pointer sign comparision/assignments and lots of
code does not conform. For now we use -Wno-pointer-sign and
-fno-strict-aliasing.
kcah
port vax
hack gcc4/vax ICE
cdate
who tsutsui
file sys/arch/vax/conf/Makefile.vax
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 gcc 2.95/vax doesn't like abort being used as function pointer
cdate Tue Dec 13 05:54:50 GMT 2005
who jmc
file lib/libc/rpc/svc_vc.c 1.15
descr
Provide a local definition for abort which doesn't include
the noreturn attribute which trips up gcc 2.95 on vax.
kcah
hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it
cdate Mon May 9 12:16:22 CDT 2005
who jmc
file gnu/usr.bin/gettext/Makefile.inc.prog 1.5
gnu/usr.bin/gettext/libgrep/Makefile 1.3
gnu/usr.bin/gettext/libnlspr/Makefile 1.5
gnu/usr.bin/gettext/libnlsut/Makefile 1.3
descr
The latest gettext assumes a C99 environment or at least
configure checks to work around this. As we don't use configure
provide a stdbool.h for vax builds locally in directories from
the template provided by the gettext code.
kcah
hack gcc 2.95/vax cannot handle __builtin_ffs()
cdate Fri Aug 23 21:31:15 CEST 2002
who ragge
file sys/lib/libkern/libkern.h : 1.42
descr
__builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has
added this feature to GCC 3 so it can be removed when switching.
kcah
hack gcc 2.95/vax libbz2
mdate 27 Jun 2002
who thorpej
file lib/libbz2/Makefile
descr
libbz2 is mis-compiled with optimization with GCC 2.95.3
on VAX. -O0 works around this problem.
kcah
hack vax Toolchain bug
cdate 28 Mar 2003
who he
file sys/arch/vax/vax/intvec.S : 1.5
descr
Workaround for PR toolchain/20924. The assembler apparently
tries to range-check byte offsets when it doesn't have
sufficient information to make that decision.
Workaround uses `brw' instead of `brb' instruction.
kcah
hack vax gcc 2.95.3 -Wuninitialized workarounds
cdate 6 Nov 2003
who he
file sys/dev/bi/if_ni.c : 1.22
file sys/arch/vax/vax/ctu.c : 1.20
descr
Workaround for gcc 2.95.3 failing to detect that certain
variables will be initialized; so that this code compiles
with -Wuninitialized. Should be reviewed and possibly
reverted when gcc 3.3.2 is ready for vax.
kcah
hack vax gcc 2.95.3 structure initialization
cdat 13 May 2004
who cl
file sys/miscfs/kernfs/kernfs_vnops.c : 1.104
descr
Workaround for gcc 2.95.3 failing to initialize structures
and/or unions inside structures using nested designators.
Should be reverted when gcc >=3.3.3 is ready for vax.
kcah
hack vax gcc 2.95.3 needs -I. to build nslexer.c
cdat 6 Jun 2004
who mhitch
file lib/libc/arch/vax/Makefile.inc : 1.6
descr
It appears necessary to add -I. to CPPFLAGS when building
nslesxer.c. This may be caused by gcc 2.95.3 being used.
Should be reverted when a newer gcc is ready for vax.
kcah
hack vax gcc 2.95.3 doesn't understand "-std=c99"
cdat 5 April 2005
who tron
file src/share/mk/bsd.sys.mk
descr
We cannot use "-std=c99" for compiler warning level 4 and above
because gcc 2.95.3 doesn't support that option.
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
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
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 sparc64
hack disable optimzations for uvm_bio.c on 32 bit kernels
cdate Sun Mar 21 14:14:04 MET 2004
who martin
file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54
file sys/arch/sparc64/conf/files.sparc64 : 1.93
descr
The sparc compiler miscompiles uvm_bio.c when using
any optimization. This results in ubc_release panics.
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
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
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