HACKS revision 1.136
1# $NetBSD: HACKS,v 1.136 2013/11/07 01:47:59 joerg Exp $ 2# 3# This file is intended to document workarounds for currently unsolved 4# (mostly) compiler bugs. 5# 6# Format: 7# hack title 8# cdate creation date 9# mdate mod date 10# who responsible developer 11# port ... 12# affected ports, space separated, if not "all" 13# file affected file : revision : line from : line to 14# affected files and revision and line numbers describing hack 15# multiple lines if necessary. 16# pr NNNN ... 17# problem reports this hack works around, if known. Space 18# separated. 19# regress src/regress/directory/where/test/found 20# regression test directories, if available. 21# descr 22# insert short informal description (multi-line). (Longer ones 23# should be in the PR database. More formal descriptions might 24# be in the regress tree. See above). 25# kcah 26# closing bracket. 27# 28# this is a comment. 29 30hack netstat ieee1394 address printing. 31mdate 14 Nov 2000 32who matt 33file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 34descr 35 Because the current implementation of IP over IEEE1394, the 36 fw device address contains more than just the IEEE1394 EUI-64. 37 So when printing out IEEE1394 addresses, ignore the extra stuff. 38kcah 39 40hack xterm vs. libterm 41mdate 01 Aug 2000 42who jdc 43file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 44pr 10383 45descr 46 In order to extend the termcap string over 1023 bytes, a ZZ entry was 47 introduced to point to a memory location containing the full entry. 48 Without this hack, xterm will export a termcap containing the ZZ 49 entry, which will then be ignored by libterm. As xterm modifies the 50 exported termcap, this would cause those modifications to be ignored. 51kcah 52 53hack wi-at-big-endian-bus 54cdate 15 Mar 2002 55who martin 56file dev/ic/wireg.h 57descr Add an option to access the underlying bus in big endian byte order 58 to work around deficiencies in bus_space_{read,write}_* macros. 59 Those don't allow the implementation of a proper pcmcia bus space 60 tag. 61kcah 62 63hack specific knowledge of colours in curses code 64cdate Sun Apr 6 11:05:24 BST 2003 65who jdc 66file lib/libcurses/color.c : r1.24 67descr 68 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 69 Fix is to enhance libtermcap to understand terminfo-style % sequences. 70 See also: 71 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 72kcah 73 74hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 75cdate 21 Aug 2003 76who he 77file sys/miscfs/procfs/procfs_linux.c : 1.14 78descr 79 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 80 literals/constants, but refer to variables of a type which is 81 not "unsigned long", causing compilation of procfs_linux.c to 82 fail with "makes integer from pointer without a cast". This 83 is observed on e.g. the sun3 port. Ideally the "types" for 84 symbols should be consistent across all ports. 85kcah 86 87hack gcc-strict-aliasing 88cdate 6 August 2004 89who junyoung 90pr 26516 91file src/usr.sbin/racoon/racoon/Makefile : 1.21 92descr 93 GCC issues a warning "dereferencing type-punned pointer will break 94 strict-aliasing rules" when compiling 95 crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this 96 is due to use of type casting in a non-standard way in the code and 97 not a compiler bug. Once a new release of KAME with a proper fix 98 applied is imported this should be backed out. 99kcah 100 101hack gcc4 wrong uninitialized variable 102mdate 10 May 2006 103who mrg 104file bin/ksh/eval.c : 1.6 105file bin/sh/histedit.c : 1.39 106file bin/sh/parser.c : 1.60 107file crypto/dist/heimdal/kdc/524.c : 1.10 108file crypto/dist/ssh/sftp.c : 1.20 109file crypto/dist/ssh/ssh-keysign.c : 1.11 110file dist/ipf/lib/hostname.c : 1.2 111file dist/ipf/tools/ipmon.c : 1.8 112file dist/ntp/ntpd/ntp_request.c : 1.4 113file dist/ntp/ntpd/refclock_shm.c : 1.4 114file dist/ntp/sntp/timing.c : 1.3 115file dist/pppd/pppstats/pppstats.c : 1.3 116file dist/smbfs/lib/smb/rap.c : 1.6 117file dist/tcpdump/print-zephyr.c : 1.5 118file distrib/utils/sysinst/aout2elf.c : 1.12 119file gnu/libexec/uucp/uucico/uucico.c : 1.6 120file lib/libc/citrus/citrus_csmapper.c : 1.6 121file lib/libc/citrus/citrus_pivot_factory.c : 1.5 122file lib/libc/inet/inet_cidr_ntop.c : 1.3 123file lib/libc/inet/inet_ntop.c : 1.3 124file lib/libc/stdio/vfwprintf.c : 1.8 125file libexec/ld.elf_so/arch/m68k/mdreloc.c : 1.20 126file libexec/ld.elf_so/arch/powerpc/ppc_reloc.c : 1.40 127file libexec/ld.elf_so/arch/sh3/mdreloc.c : 1.22 128file libexec/ld.elf_so/arch/sparc/mdreloc.c : 1.39 129file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39 130file libexec/ld.elf_so/arch/vax/mdreloc.c : 1.21 131file libexec/ld.elf_so/arch/x86_64/mdreloc.c : 1.27 132file sbin/fsck_ext2fs/dir.c : 1.19 133file sbin/routed/rtquery/rtquery.c : 1.18 134file sys/arch/amd64/amd64/pmap.c : 1.26 135file sys/arch/i386/pci/piixpcib.c : 1.4 136file sys/arch/m68k/m68k/pmap_motorola.c : 1.4 137file sys/crypto/cast128/cast128.c : 1.9 138file sys/ddb/db_command.c : 1.86 139file sys/dev/cardbus/cardbus_map.c : 1.21 140file sys/dev/fss.c : 1.25 141file sys/dev/ic/igsfb.c : 1.39 142file sys/dev/ic/mb86950.c : 1.5 143file sys/dev/ic/midway.c : 1.71 144file sys/dev/kttcp.c : 1.18 145file sys/dev/rasops/rasops_bitops.h : 1.9 146file sys/dev/pci/cmpci.c : 1.31 147file sys/dev/pci/machfb.c : 1.45 148file sys/dev/usb/ohci.c : 1.174 149file sys/dev/usb/uhci.c : 1.196 150file sys/dev/rasops/rasops_bitops.h : 1.9 151file sys/dist/ipf/netinet/ip_nat.c : 1.10 152file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8 153file sys/dist/pf/net/pf.c : 1.22 154file sys/fs/udf/udf_vnops.c : 1.4 155file sys/kern/kern_sig.c : 1.219 156file sys/kern/tty.c : 1.181 157file sys/net/bpf.c : 1.116 158file sys/net/zlib.c : 1.26 159file sys/netccitt/if_x25subr.c : 1.37 160file sys/netinet/in.c : 1.107 161file sys/netsmb/smb_smb.c : 1.27 162file sys/netsmb/smb_trantcp.c : 1.22 163file sys/nfs/nfs_serv.c : 1.108 164file sys/nfs/nfs_socket.c : 1.129 165file sys/nfs/nfs_syscalls.c : 1.91 166file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)] 167file usr.bin/ftp/ftp.c : 1.140 168file usr.bin/find/function.c : 1.54 169file usr.bin/mail/tty.c : 1.20 170file usr.bin/msgc/msg_sys.def : 1.33-1.34 171file usr.bin/nl/nl.c : 1.7 172file usr.bin/systat/keyboard.c : 1.23 173file usr.bin/usbhidctl/usbhid.c : 1.29 174file usr.bin/vi/cl/cl_read.c : 1.5 175file usr.bin/vi/ex/ex_cscope.c : 1.12 176file usr.bin/vi/ex/ex_tag.c : 1.19 177file usr.bin/vi/vi/v_txt.c : 1.15 178file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4 179file usr.sbin/cron/do_command.c : 1.19 180file usr.sbin/timed/timed/slave.c : 1.15 181descr 182 GCC 4.1 gets many uninitialised variable warnings wrong. We should 183 really audit all the old hacks like this when older compilers are 184 removed from the tree, as many are probably no longer required. 185 The problem is that it does not recognize initialization via function 186 call pointer. I.e. 187 int p; 188 foo(&p); 189 does not mark p as initialized. 190kcah 191 192hack gcc4 pointer sign and strict aliasing problems 193mdate 10 May 2006 194who mrg 195file bin/ed/Makefile : 1.33 196file distrib/utils/sysinst/Makefile.inc : 1.44 197file distrib/utils/x_dhclient/Makefile : 1.15 198file games/bcd/Makefile : 1.5 199file games/dab/Makefile : 1.5 200file games/larn/Makefile : 1.17 201file games/pom/Makefile : 1.5 202file lib/libasn1/Makefile : 1.26 203file lib/libcrypt/Makefile : 1.17 204file lib/libgssapi/Makefile : 1.16 205file lib/libhdb/Makefile : 1.20 206file lib/libkadm5clnt/Makefile : 1.21 207file lib/libkadm5srv/Makefile : 1.25 208file lib/libkrb5/Makefile : 1.35 209file lib/libssh/Makefile : 1.6 210file lib/libtelnet/Makefile : 1.26 211file libexec/getty/Makefile : 1.14 212file libexec/kadmind/Makefile : 1.19 213file libexec/kpasswdd/Makefile : 1.14 214file sbin/atactl/Makefile : 1.3 215file sbin/cgdconfig/Makefile : 1.7 216file sbin/clri/Makefile : 1.13 217file sbin/dkctl/Makefile : 1.4 218file sbin/dump/Makefile : 1.33 219file sbin/fdisk/Makefile : 1.35 220file sbin/fsck_ext2fs/Makefile : 1.11 221file sbin/fsck_ffs/Makefile : 1.29 222file sbin/fsdb/Makefile : 1.18 223file sbin/mount_smbfs/Makefile : 1.4 224file sbin/newfs/Makefile : 1.30 225file sbin/newfs_sysvbfs/Makefile : 1.2 226file sbin/restore/Makefile : 1.23 227file sbin/veriexecctl/Makefile : 1.11 228file sys/lib/libsa/Makefile : 1.59 229file sys/arch/evbarm/adi_brh/brh_machdep.c : 1.24 230file usr.bin/awk/Makefile : 1.9 231file usr.bin/crontab/Makefile : 1.24 232file usr.bin/ctags/Makefile : 1.8 233file usr.bin/gzip/Makefile : 1.10 234file usr.bin/ssh/sftp/Makefile : 1.10 235file usr.bin/ssh/ssh/Makefile : 1.25 236file usr.bin/vi/build/Makefile : 1.26 237file usr.bin/telnet/Makefile : 1.40 238file usr.bin/tn3270/tn3270/Makefile : 1.36 239file usr.bin/tr/Makefile : 1.4 240file usr.sbin/amd/amd/Makefile : 1.27 241file usr.sbin/amd/amq/Makefile : 1.14 242file usr.sbin/amd/libamu/Makefile : 1.20 243file usr.sbin/amd/pawd/Makefile : 1.5 244file usr.sbin/bind/Makefile.inc : 1.22 245file usr.sbin/bind/libdns/Makefile : 1.3 246file usr.sbin/bind/named/Makefile : 1.17 247file usr.sbin/bootp/bootptest/Makefile : 1.2 248file usr.sbin/chrtbl/Makefile : 1.6 249file usr.sbin/cron/Makefile : 1.12 250file usr.sbin/dhcp/Makefile.inc : 1.20 251file usr.sbin/dumplfs/Makefile : 1.11 252file usr.sbin/hprop/Makefile : 1.13 253file usr.sbin/installboot/Makefile : 1.35 254file usr.sbin/ipf/ipftest/Makefile : 1.32 255file usr.sbin/isdn/isdnd/Makefile : 1.6 256file usr.sbin/isdn/isdnmonitor/Makefile : 1.3 257file usr.sbin/isdn/isdntel/Makefile : 1.2 258file usr.sbin/isdn/isdntrace/Makefile : 126 259file usr.sbin/mopd/common/Makefile : 1.10 260file usr.sbin/mopd/mopd/Makefile : 1.9 261file usr.sbin/mopd/mopprobe/Makefile : 1.7 262file usr.sbin/makefs/Makefile : 1.17 263file usr.sbin/mscdlabel/Makefile : 1.5 264file usr.sbin/pkg_install/add/Makefile : 1.7 265file usr.sbin/pkg_install/create/Makefile : 1.5 266file usr.sbin/pkg_install/lib/Makefile : 1.28 267file usr.sbin/ntp/ntpd/Makefile : 1.10/1.11 268file usr.sbin/ntp/ntptime/Makefile : 1.4/1.5 269file usr.sbin/pppd/Makefile.inc : 1.3 270file usr.sbin/pppd/pppd/Makefile : 1.38 271file usr.sbin/rarpd/Makefile : 1.10 272file usr.sbin/rbootd/Makefile : 1.10 273file usr.sbin/rpc.pcnfsd/Makefile : 1.17 274file usr.sbin/rtadvd/Makefile : 1.9 275file usr.sbin/tcpdump/Makefile : 1.42 276file usr.sbin/wiconfig/Makefile : 1.3 277descr 278 GCC 4.1 warns on pointer sign comparision/assignments and lots of 279 code does not conform. For now we use -Wno-pointer-sign and 280 -fno-strict-aliasing. 281kcah 282 283hack emacs aborting on exit (libgcc issue) 284mdate 7 November 2011 285who christos 286file external/gpl3/gcc/dist/gcc/unwind-dw2-fde.c : 1.2 287descr 288 GCC 4.5.3 now calls __unregister_frame_info_bases() on unloading/exit 289 to do just that. If the symbol requested is not found, then it aborts. 290 emacs 23.3 triggers this assertion. For now disable aborting, and 291 silently ignore. 292kcah 293 294hack cross-building hack on Darwin 295mdate 20 July 2008 296who agc 297file src/distrib/common/Makefile.mdset : 1.33 298descr 299 Darwin has problems with getopt() when used in mdsetimage -v, 300 due to the difference between BSD and libiberty() getopt 301 implementations, more fully described in 302 http://mail-index.netbsd.org/current-users/2008/06/27/msg003242.html 303 and the subsequent thread. For just now, we just have an ugly 304 workaround not to call mdsetimage with the -v argument on Darwin 305kcah 306 307hack avoid rebuilding asn1 libraries 308mdate 03 August 2008 309who veego 310file src/crypto/dist/heimdal/lib/asn1/gen.c : 1.10 311file src/lib/libasn1/Makefile : 1.32 312file src/lib/libhdb/Makefile : 1.23 313file src/lib/libgssapi/Makefile : 1.20 314file src/lib/libhx509/Makefile : 1.3 315pr 9702 39185 316descr 317 asn1_compile does not check if generated header files do not have to 318 be rebuild. 319 Generate .hx files and copy it in the Makefiles if they changed. 320kcah 321 322hack avoid gcc4 -O1 bug in loop optimize 323cdate 29 November 2008 324who tsutsui 325file src/sbin/ifconfig/Makefile : 1.39 326pr 40036 40066 327descr 328 gcc -O1 seems to generate wrong code in loop optimize so that 329 ifconfig lo0 inet6 doesn't return error even if a kernel 330 doesn't have IPv6 support. (see the above PRs for details) 331 For workaround, specify -fno-loop-optimize on m68000, 332 which uses -O1 by default. 333kcah 334 335hack MKPIE ldscript for /usr.sbin/crash 336cdate 22 April 2010 337who christos 338file src/usr.sbin/crash/Makefile : 1.5 339file src/usr.sbin/crash/ldscript.crash : 1.1 340pr N/A 341descr 342 fixed in binutils-2.20.1. Linking with MKPIE=yes causes overlapping 343 sections 344kcah 345 346port vax 347 348 hack gcc4/vax ICE 349 cdate 350 who tsutsui 351 file sys/arch/vax/conf/Makefile.vax 352 descr 353 GCC4 on vax gets ICE on compiling sys/ddb/db_command.c. 354 -fno-tree-ter prevents it so add it to COPTS. 355 kcah 356 357 hack gcc4/vax compiler crash 358 cdate Fri Jun 30 22:39:12 PDT 2006 359 who mrg 360 file bin/csh/Makefile : 1.27 361 file lib/i18n_module/UTF7/Makefile : 1.2 362 descr 363 GCC4 on vax crashes. -O0 stops it happening so far... 364 kcah 365 366 hack gcc 2.95/vax doesn't like abort being used as function pointer 367 cdate Tue Dec 13 05:54:50 GMT 2005 368 who jmc 369 file lib/libc/rpc/svc_vc.c 1.15 370 descr 371 Provide a local definition for abort which doesn't include 372 the noreturn attribute which trips up gcc 2.95 on vax. 373 kcah 374 375 hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it 376 cdate Mon May 9 12:16:22 CDT 2005 377 who jmc 378 file gnu/usr.bin/gettext/Makefile.inc.prog 1.5 379 gnu/usr.bin/gettext/libgrep/Makefile 1.3 380 gnu/usr.bin/gettext/libnlspr/Makefile 1.5 381 gnu/usr.bin/gettext/libnlsut/Makefile 1.3 382 descr 383 The latest gettext assumes a C99 environment or at least 384 configure checks to work around this. As we don't use configure 385 provide a stdbool.h for vax builds locally in directories from 386 the template provided by the gettext code. 387 kcah 388 389 hack gcc 2.95/vax cannot handle __builtin_ffs() 390 cdate Fri Aug 23 21:31:15 CEST 2002 391 who ragge 392 file sys/lib/libkern/libkern.h : 1.42 393 descr 394 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 395 added this feature to GCC 3 so it can be removed when switching. 396 kcah 397 398 hack gcc 2.95/vax libbz2 399 mdate 27 Jun 2002 400 who thorpej 401 file lib/libbz2/Makefile 402 descr 403 libbz2 is mis-compiled with optimization with GCC 2.95.3 404 on VAX. -O0 works around this problem. 405 kcah 406 407 hack vax Toolchain bug 408 cdate 28 Mar 2003 409 who he 410 file sys/arch/vax/vax/intvec.S : 1.5 411 descr 412 Workaround for PR toolchain/20924. The assembler apparently 413 tries to range-check byte offsets when it doesn't have 414 sufficient information to make that decision. 415 Workaround uses `brw' instead of `brb' instruction. 416 kcah 417 418 hack vax gcc 2.95.3 -Wuninitialized workarounds 419 cdate 6 Nov 2003 420 who he 421 file sys/dev/bi/if_ni.c : 1.22 422 file sys/arch/vax/vax/ctu.c : 1.20 423 descr 424 Workaround for gcc 2.95.3 failing to detect that certain 425 variables will be initialized; so that this code compiles 426 with -Wuninitialized. Should be reviewed and possibly 427 reverted when gcc 3.3.2 is ready for vax. 428 kcah 429 430 hack vax gcc 2.95.3 structure initialization 431 cdat 13 May 2004 432 who cl 433 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 434 descr 435 Workaround for gcc 2.95.3 failing to initialize structures 436 and/or unions inside structures using nested designators. 437 Should be reverted when gcc >=3.3.3 is ready for vax. 438 kcah 439 440 hack vax gcc 2.95.3 needs -I. to build nslexer.c 441 cdat 6 Jun 2004 442 who mhitch 443 file lib/libc/arch/vax/Makefile.inc : 1.6 444 descr 445 It appears necessary to add -I. to CPPFLAGS when building 446 nslesxer.c. This may be caused by gcc 2.95.3 being used. 447 Should be reverted when a newer gcc is ready for vax. 448 kcah 449 450 hack vax gcc 2.95.3 doesn't understand "-std=c99" 451 cdat 5 April 2005 452 who tron 453 file src/share/mk/bsd.sys.mk 454 descr 455 We cannot use "-std=c99" for compiler warning level 4 and above 456 because gcc 2.95.3 doesn't support that option. 457 kcah 458 459 hack declare boolean_t in two IPF user-mode programs 460 cdate Tue Mar 7 19:19:20 CET 2006 461 who he 462 file dist/ipf/ipsend/iptests.c : 1.8 463 dist/ipf/ipsend/sock.c : 1.7 464 descr 465 The IPF user-mode programs ipsend and iptest first 466 include <sys/types.h> without _KERNEL defined, and 467 later include <sys/file.h> with _KERNEL defined. 468 This causes a build failure when building for vax, 469 since <sys/device.h> ends up being included without 470 bollean_t being defined by <sys/types.h>. 471 Build failure and further details documented in 472 PR#32907. 473 kcah 474 475 hack pcc 0.9.9 large string literals 476 cdat 8 July 2008 477 who gmcgarry 478 file sys/conf/param.c : 1.58 479 descr 480 Workaround for pcc 0.9.9 not handling large string literals 481 which causes kernels with 'options INCLUDE_CONFIG_FILE' to 482 fail compilation. 483 There is a proposal on the pcc mailing list to stuff config 484 file in ELF section. 485 kcah 486 487 hack xorg warnings 488 cdat 30 July 2008, 3 June, 2013 489 who mrg 490 file external/mit/xorg/lib/libSM/Makefile : 1.2 491 external/mit/xorg/lib/libX11/Makefile.libx11 : 1.10 492 external/mit/xorg/lib/libXext/Makefile : 1.2 493 external/mit/xorg/lib/libXfont/Makefile : 1.2 494 descr 495 Disable several warnings or use -Wno-error across Xorg sources 496 while we get them working 497 kcah 498 499 hack 32 bit time leftovers 500 cdat 11 January 2009 501 who christos 502 file lib/libc/time/localtime.c : 1.41 503 lib/libc/time/zic.c : 1.23 504 descr 505 The timezone compiled files still contain 32 bit time_t 506 quantities. I did not want to version the files because 507 the ``parser'' is too ugly for words. What needs to be 508 done, is to rewrite the parser from scratch also to avoid 509 potential core-dumps from parsing invalid files. 510 kcah 511 512 hack 32 bit time leftovers 513 cdat 11 January 2009 514 who christos 515 file various 516 descr 517 Many filesystem on-disk formats have 32 bit times. 518 kcah 519 520port arm 521 522 hack gcc-unsigned-compare 523 cdate 09 Mar 2002 524 mdate 18 Mar 2002 525 who bjh21 526 file dist/bind/lib/nameser/ns_parse.c : 1.3 527 file dist/dhcp/minires/ns_parse.c : 1.3 528 file dist/dhcp/omapip/result.c : 1.2 529 file dist/dhcp/server/failover.c : 1.3 530 file gnu/dist/toolchain/bfd/bfd.c : 1.2 531 file gnu/dist/toolchain/bfd/format.c : 1.2 532 file gnu/dist/toolchain/gdb/target.c : 1.2 533 file sys/kern/vfs_subr.c : 1.172 534 descr When checking that a potentially-unsigned enum is >= 0, assign 535 it to an int first. This is necessary to avoid "comparison is 536 always true" warnings with -fshort-enums. Casting to an int 537 really should be enough, but turns out not to be. 538 kcah 539 540 hack gcc-4.5 arm CNAME hostname lookup failure on 541 certain DNS environment (probably -ftree-ter problem) 542 cdate Sat Dec 24 04:59:00 UTC 2011 543 mdate 544 who tsutsui 545 file lib/libc/net/Makefile.inc 1.79 546 descr Hostname lookup against CNAMEs by some commands fails 547 on certain DNS environments if lib/libc/net/gethnamaddr.c 548 (ping(8) etc) and lib/libc/net/getaddrinfo.c (ftp(1) etc) 549 are compiled with -O2, even though nslookup(1) against 550 the same CNAME returns proper hostname. 551 They works properly if compiled with -O2 -fno-tree-ter. 552 Also -O2 fails but -O2 -fno-tree-ter works on the following 553 test case in gcc bugzilla: 554 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48863#c4 555 kcah 556 557 hack gcc-4.5 arm without -fno-tree-vrp generate broken code 558 cdate Wed Nov 14 13:02:02 JST 2012 559 who msaitoh 560 file lib/libc/softfloat/Makefile.inc 561 pr 46953 562 regress src/tests/lib/libm/t_cbrt 563 regress src/tests/lib/libm/t_ceil 564 regress src/tests/lib/libm/t_exp 565 regress src/tests/lib/libm/t_log 566 regress src/tests/lib/libm/t_scalbn 567 regress src/tests/lib/libm/t_sinh 568 regress src/tests/lib/libm/t_sqrt 569 descr Gcc has a bug in tree optimization. For adddf3, 570 -INF + -INF returns 0 without -fno-tree-vrp. 571 Debugging with -fdump-tree-all shows that 572 softfloat.c.021t.cleanup_cfg is ok but softfloat.c.023t.ssa 573 is broken. 574 kcah 575 576port sh3 577 578 hack gcc4-sh3-bz2 579 cdate Sun May 21 03:34:57 UTC 2006 580 mdate Fri May 16 13:13:00 UTC 2008 581 who mrg, tsutsui 582 file lib/libbz2/Makefile : 1.10 583 descr 584 The in-tree GCC 4.1-based compiler generated too-far 585 pc-relative addresses. Hack is to build with 586 -fno-loop-optimize. 587 kcah 588 589 590port m68000 591 592 hack gcc4-m68000 593 cdate Fri Feb 8 10:29:37 PST 2008 594 mdate Sun May 4 15:37:19 UTC 2008 595 who mrg, tsutsui 596 file rescue/Makefile : 1.21 597 file sbin/dump_lfs/Makefile : 1.9 598 file sbin/fsck_ffs/Makefile : 1.35 599 file sbin/fsdb/Makefile : 1.22 600 file share/mk/sys.mk : 1.96 601 file usr.sbin/ndbootd/Makefile : 1.5 602 descr 603 Several internal compiler errors with gcc -O1 604 around 64bit integer arithmetic. 605 This hack uses -O1 and adds some -fno-tree-foo options 606 to avoid the problem. 607 This might be related with GCC Bugzilla Bug 32424. 608 kcah 609 610port m68k,sh3 611 612 hack gcc-4.8.1 613 cdate Wed Nov 6 20:41:35 EST 2013 614 who christos 615 file src/external/gpl3/gcc/libstdc++/Makefile 616 descr 617 compile hashtable_c++0x.cc with -O2 instead of -Os to 618 produce missing instantiation of std::lower_bound expansion 619 for unsigned long. 620 kcah 621 622port sparc 623 624 hack avoid NULL pointer derefs in savefpstate IPIs and GCC 4.5.3 625 cdate Sun Aug 14 19:26:48 PDT 2011 626 who mrg 627 file sys/arch/sparc64/sparc/cpu.c : 1.234 628 file sys/arch/sparc64/sparc/cpuvar.h : 1.90 629 file sys/arch/sparc64/sparc/genassym.cf : 1.67 630 file sys/arch/sparc64/sparc/locore.s : 1.265 631 descr 632 Something is wrong with GCC 4.5.3 and the savefpstate IPI. 633 Post newlock2 there was a bug where a lock was reduced from 634 IPL_SCHED to IPL_VM (?) and occasionally savefpstate IPI 635 would crash due to NULL IPI. This was fixed by re-using the 636 right IPL value. However, GCC 4.5.3 build kernels have the 637 same problems. For now, the hack is re-instated. 638 kcah 639 640 641port mips 642 643 hack mips-shared-linker-load-address 644 cdate Fri Oct 7 08:33:10 UTC 2005 645 who simonb 646 file src/sys/kern/exec_elf32.c : 1.107 647 descr 648 With COMPAT_16 or previous enabled (which enables 649 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 650 load and run at address 0. The check to fix this in 651 rev 1.107 only checks the first psection of the ELF 652 executable, which may not be loadable. A more correct 653 fix is to check the first loadable psection instead of 654 just the first psection. 655 kcah 656 657 hack mips-duplicate-ras-end-label 658 cdate Sat Sep 2 23:29:42 2006 659 who martin 660 file src/regress/sys/kern/ras/ras3/Makefile : 1.3 661 descr 662 Add -fno-reorder-blocks to CFLAGS to avoid duplicate 663 labels by duplicated __asm output from RAS_END() 664 macro. 665 kcah 666 667 hack mips-mcount-assembler-warning 668 cdate Tue Jul 29 14:16:52 UTC 2008 669 who lukem 670 file src/lib/libc/gmon/Makefile.inc : 1.8 671 descr 672 Workaround for PR port-mips/39192. 673 common/lib/libc/gmon/mcount.c generates a (fatal) 674 assembler warning on MIPS: 675 Warning: No .cprestore pseudo-op used in PIC code 676 Add COPTS.count.c+=-Wa,--no-warn to avoid -Wa,--fatal-warnings 677 kcah 678 679port i386 680 681 hack use volatile intermediate variable to enforce rounding 682 cdate Tue Aug 1 22:15:55 MEST 2006 683 who drochner 684 file src/lib/libm/src/lrintf.c : 1.4 685 file src/lib/libm/src/s_rintf.c : 1.8 686 descr 687 gcc-4 does subsequent operations on "float" values within 688 the i387 FPU without rounding the intermediate results 689 kcah 690 691port powerpc 692 693 hack avoid using __builtin_return_address(0) because it fails in 694 Xorg's module loader 695 cdate Sat Sep 27 03:52:05 UTC 2008 696 who macallan 697 file src/libexec/ld.elf_so/rtld.c : 1.121 698 descr 699 workaround for PR port-macppc/37812 700 kcah 701 702 hack define TARGET_SECURE_PLT and HAVE_AS_TLS because when 703 building the native compiler via build.sh those don't defined 704 properly. 705 cdate Sat Mar 12 08:00:00 UTC 2011 706 who matt 707 file src/gnu/dist/gcc4/gcc/config/rs6000/netbsd.h 708 descr 709 see above 710 kcah 711 712port powerpc64 713 714 hack include _errno.c in libposix so that __errno resolves. It 715 should resolve from libc's errno, but somehow it does not. 716 Linker bug? 717 cdate Thu Oct 27 13:19:47 EDT 2011 718 who christos 719 file src/lib/libposix/Makefile: 1.15 720 file src/lib/librt/Makefile: 1.14 721 descr 722 workaround for: 723 libposix_pic.a(cerror.pico)(.text+0x14): unresolvable \ 724 R_PPC64_REL24 relocation against symbol `.__errno' 725 kcah 726 727 hack rename data() function in mdocml to avoid redefined error. 728 Compiler/Assembler bug? 729 cdate Sat Oct 29 11:16:01 EDT 2011 730 who christos 731 file src/external/bsd/mdocml/tbl_data.c: 1.2 732 descr 733 workaround for: 734 {standard input}: Assembler messages: 735 {standard input}:105: Error: symbol `.data' is already \ 736 defined 737 kcah 738 739port emips 740 741 hack Add nop between ctc1 and mtc0 to avoid assembler internal 742 error 743 cdate Sat Oct 29 16:57:34 EDT 2011 744 who christos 745 file src/sys/arch/mips/mips/mips_fpu.c: 1.7 746 descr 747 workaround for: 748 {standard input}: Assembler messages: 749 {standard input}:730: Internal error! 750 Assertion failure in append_insn at /usr/src/external/gpl3/\ 751 binutils/dist/gas/config/tc-mips.c line 2910. 752 kcah 753 754port ia64 755 756 hack libc hesiod.c file does not compile with -O2 (internal 757 compiler error in gcc 4.5.3) 758 cdate Thu Dec 27 08:05:43 CET 2012 759 who martin 760 file src/lib/libc/net/Makefile.inc: 1.82 761 descr 762 workaround for: 763 {standard input}: Assembler messages: 764 {standard input}:1507: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 15 765 {standard input}:1506: Warning: This is the location of the conflicting usage 766 {standard input}: Error: 2 warnings, treating warnings as errors 767 kcah 768 769 hack libelf libelf_extended.c compiler error in gcc 4.5.3 770 cdate Thu Dec 27 09:05:51 CET 2012 771 who martin 772 file src/external/bsd/libelf/lib/Makefile: 1.3 773 descr 774 workaround for: 775 {standard input}: Assembler messages: 776 {standard input}:87: Warning: Use of 'adds' may violate RAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 33 777 {standard input}:87: Warning: Only the first path encountering the conflict is reported 778 {standard input}:85: Warning: This is the location of the conflicting usage 779 kcah 780 781 hack compiler error with gcc 4.5.x 782 cdate Thu Dec 27 15:15:25 CET 2012 783 who martin 784 file src/crypto/external/bsd/netpgp/lib/verify/Makefile: 1.5 785 descr 786 workaround for: 787 {standard input}: Assembler messages: 788 {standard input}:22979: Warning: Use of 'mov' may violate WAW dependency 'GR%, % in 1 - 127' (impliedf), specific resource number is 8 789 {standard input}:22978: Warning: This is the location of the conflicting usage 790 kcah 791 792port x68k 793 794 hack compiler error with gcc 4.5.x 795 cdate Fri May 24 13:23:01 EDT 2013 796 who christos 797 file src/external/gpl3/gcc/usr.bin/bakend/Makefile: 1.17 798 xsrc/external/mit/xorg/lib/libGLU/Makefile: 1.11 799 src/x11/lib/GLU/Makefile: 1.9 800 descr 801 workaround for: 802 internal compiler error: in cselib_record_set, at cselib.c:1999 803 kcah 804 805hack fallback to /usr/bin/clang-cpp in rpcgen 806cdate Wed Jun 5 15:49:27 CEST 2013 807who joerg 808file src/usr.bin/rpcgen/rpc_main.c 809descr 810 It is undecided which compiler owns /usr/bin/cpp and whether it should 811 exist in a MKGCC=no world. To allow rpcgen to work out-of-the-box, 812 if either gcc or clang is installed, use /usr/bin/clang-cpp as fallback. 813 This applies only if RPCGEN_CPP is not set and /usr/bin/cpp is not executable. 814kcah 815 816port hp700 817 818 hack compiler error with gcc 4.5.x 819 cdate Tue Jul 23 07:42:28 BST 2013 820 who skrll 821 file src/sys/lib/libkern/Makefile.libkern: 1.26 822 descr 823 workaround for unanalysed codegen bug affecting md5c.c. 824 kcah 825