# $NetBSD: HACKS,v 1.58 2006/05/11 01:10:13 mrg 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 GCC2 isn't C99 cdate 5 December 2003 who mrg file gnu/dist/binutils/ld/ldlex.c: r1.2 descr ldlex.c is generated from ldlex.l and we get macro redefinition errors from it if __STDC_VERSION__ is not C99 compliant. This hack forces NetBSD 1.6 and later systems to also include to get the relevant definitions. This hack should be backed out when all platforms have switched away from GCC2. 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 uninitialised 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 bin/systrace/systrace.c : 1.33 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/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 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/sparc64/mdreloc.c : 1.39 file sbin/fsck_ext2fs/dir.c : 1.19 file sbin/routed/rtquery/rtquery.c : 1.18 file sys/crypto/cast128/cast128.c : 1.9 file sys/ddb/db_command.c : 1.86 file sys/dev/fss.c : 1.25 file sys/dev/ic/midway.c : 1.71 file sys/dev/pci/machfb.c : 1.45 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/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/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/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. kcah port vax 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. 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. hack gcc 2.95/vax can't handle __used__ in mcount.c cdate Fri May 6 14:30:53 CDT 2005 who jmc file src/lib/libc/gmon/mcount.c 1.17 descr Recent changes to mark this as __used__ to prevent optimization away on sparc64 don't work on 2.95 vax. Ifdef'd back in the old __unused__ if on vax. 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. hack gcc-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 gawk mdate 8 Nov 2003 who ragge file gnu/usr.bin/gawk/Makefile descr gawk 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 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 port sparc64 hack binutil-2.11-sparc64-pltrela mdate 14 Aug 2001 who eeh file libexec/ld.elf_so/arch/sparc64/mdreloc.c descr The first four PLT entries are reserved. There is some disagreement whether they should have associated relocation entries. Both the SPARC 32-bit and 64-bit ELF specifications say that they should have relocation entries, but the 32-bit SPARC binutils do not generate them, and now the 64-bit SPARC binutils have stopped generating them too. To provide binary compatibility, we will check the first entry, if it is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT, then the 4 reserved entries were not generated and our index is 4 entries too far, so we frob the rela pointer. 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/gawk/eval.c : 1.4 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 3.3.2/arm sys/kern/uipc_socket.c cdate Tue Oct 28 18:02:16 GMT 2003 who skrll pr 23044 file sys/arch/arm/conf/Makefile.arm : 1.19 descr Performing a build.sh tools on a CATS with NFS mounted obj and src directories results in "panic: receive 1" The hack is to compile sys/kern/uipc_socket.c with -fno-strict-aliasing kcah port pc532 hack egcs-pc532-ip6_mroute cdate 09 Jul 2002 who simonb file sys/arch/pc532/conf/Makefile.pc532 : 1.70 file sys/arch/pc532/conf/files.pc532 : 1.47 descr egcs 1.1.2 gets an "internal error--insn does not satisfy its constraints" error compiling ip6_mroute.c with -O2 or greater. -O1 works around this problem. kcah hack gcc-pc532-duffs_device cdate Mon Oct 27 07:23:05 UTC 2003 who simonb file sys/arch/pc532/conf/Makefile.pc532 : 1.71 file sys/arch/pc532/conf/files.pc532 : 1.52 pr GCC PR optimization/5230 descr gcc incorrectly gives an "unreachable code at beginning of switch statement" for a Duff's device construct in arch/pc532/dev/ncr.c. There is no way to disable just this warning, so -Wno-error is turned on for this file. kcah hack gcc332-cppmacro-ice cdate Sun Dec 7 12:48:33 UTC 2003 who simonb file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 descr gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. The hack is to use -O1 for this file. Fixed in gcc -current mainline, unable to work out where the fix is right now. kcah port sh3 hack gcc-sh3-sed mdate 23 Apr 2002 who thorpej file usr.bin/sed/Makefile : 1.9 : 9 : 13 descr The in-tree GCC 2.95.3-based compiler ICEs when building with optimization for SuperH. Hack is to build with -O0. kcah port sh5 hack SuperH SH5 Toolchain Bugs cdate 11 Jul 2002 who scw file usr.sbin/ndbootd/ndbootd.c : 1.6 file usr.sbin/traceroute/traceroute.c : 1.48 descr The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal compiler error when assigning a bit-wise inverted value under some circumstances. Work around it by splitting the statement into two. kcah hack SuperH SH5 Toolchain Bugs cdate 17 May 2003 who scw file lib/libpthread/pthread_lock.c : 1.7 descr The SuperH SH5 toolchain generates incorrect PIC code when faced with a symbol which is declared extern, but has local scope due to being defined within an asm() statement (without being declared .globl in that statement). Work around it by adding the .globl. kcah hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 cdate Sun Dec 7 19:44:05 GMT 2003 who scw file gnu/usr.bin/gcc3/backend/Makefile : 1.13 descr Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. Drop to -O1 for now when building for sh5. kcah hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 cdate Sun Dec 7 21:10:46 GMT 2003 who scw file gnu/lib/libbfd/Makefile : 1.39 descr Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c and elf64.c at -O2. Drop to -O1 for now when building for sh5. kcah hack gcc 3.3.2 on sh5 - fatal warning compiling function.c cdate Sun Dec 7 19:44:05 GMT 2003 who scw file gnu/usr.bin/gcc3/backend/Makefile : 1.13 descr Gcc3 for sh5 issues a warning: .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of mutually exclusive equal-tests is always 0. This causes the build to fail because of -Werror. Work-around by defining NOGCCERROR when building for sh5. kcah hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c cdate Thu Nov 11 00:35:33 UTC 2004 who he file usr.sbin/bind/libdns/Makefile/1.2 descr Gcc3 for sh5 gets an ICE compiling these files at -O2. Drop to -O1 for now when building for sh5. kcah hack gcc 3.3.3 nb3 on sh5 - ICE compiling bsd-comp.c cdate Thu May 25 23:05:20 UTC 2005 who he file sys/lkm/net/bsdcomp/Makefile : 1.3 descr Gcc3 for sh5 gets an ICE compiling this at -O2, "could not split insn". Drop to -O1 for sh5. kcah hack gcc 3.3.3 nb3 on sh5 - ICE compiling strtod.c cdate Tue Jan 31 10:51:52 GMT 2006 who scw file lib/libc/gdtoa/Makefile.inc : 1.2 descr Gcc3 for sh5 gets an ICE compiling this at -O2, "could not split insn". Drop to -O1 for sh5. kcah port sun2 hack gcc 3.3.2/mdsetimage cdate Tue Oct 28 18:43:05 EST 2003 who fredette file gnu/usr.sbin/mdsetimage/Makefile : 1.15 descr mdsetimage.c causes cc1 to barf for as-yet unknown reasons. this hack uses -O0 to avoid the problem. kcah hack gcc 3.3.2/installboot/ffs.c cdate Tue Oct 28 18:43:05 EST 2003 who fredette file usr.sbin/installboot/Makefile : 1.26 descr ffs.c causes cc1 to barf for as-yet unknown reasons. this hack uses -O0 to avoid the problem. kcah port m68000 hack gcc 3.3.2/gcc/ra-colorize.c cdate Wed Nov 5 11:03:13 EST 2003 who mrg file gnu/usr.bin/gcc3/backend/Makefile : 1.11 descr ra-colorize.c causes a whole spew of unreferenced .L* local symbols. using -O0 (or even -O2 reportedly) avoids the problem. Note this has been fixed in 3.3.3 at least on m68k, but it hasn't been confirmed on sun2/m68000. (it's too slow even on emulator and unlikely to build toolchains on sun2 with its maximum 4MB RAM) 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 macppc hack remove inline from rotate_{left,right} cdate Tue Feb 22 13:43:25 EST 2005 who christos file src/dist/bind/lib/dns/rbt.c descr The macppc gcc-3.3 compiler miscompiles rbt.c when these functions are inlined. The error is: .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed .* named[368]: exiting (due to assertion failure) This is reportedly fixed in gcc-3.4 kcah port hppa hack hppa-gcc-3.3.3/grep/dfa.c cdate Sun Aug 8 08:34:32 PDT 2004 who chs file gnu/usr.bin/grep/grep/Makefile : 1.4 descr gcc 3.3.3 generates bad code for dfa.c with -O2, reduce optimization to -O1 to avoid the bug. kcah hack hppa-gcc-3.3.3 / make/buf.c cdate Mon May 8 13:02:36 CEST 2006 who he file usr.bin/make/Makefile : 1.34 descr gcc 3.3.3 nb3 gets an "unrecognized insn" internal compiler error when building this file with -O2, reduce optimization to -O1 to avoid the bug. kcah hack hppa boot-from-disk memory corruption cdate Wed May 18 06:56:07 PDT 2005 who chs file src/sys/dev/scsipi/scsipiconf.h : 1.98 descr There is some bug with DMA on hppa that corrupts scsipi_xfer structures, but it only shows up when booting from disk. For now, we'll add some padding to scsipi_xfer so that the corrupted memory is not otherwise used. 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