# $NetBSD: HACKS,v 1.229 2022/05/31 19:14:10 christos 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 . 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 to use the __c99_cabs{,f,l} directly. Using the __builtin_cabs{,f,l} in gcc is still broken. kcah port vax 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 without _KERNEL defined, and later include with _KERNEL defined. This causes a build failure when building for vax, since ends up being included without bollean_t being defined by . 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 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 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 for GCC8 and GCC9 cdate Mon Aug 10 06:27:29 UTC 2020 mdate Mon Oct 5 22:00:00 JST 2020 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). 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