HACKS revision 1.58
1 # $NetBSD: HACKS,v 1.58 2006/05/11 01:10:13 mrg 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 30 hack netstat ieee1394 address printing. 31 mdate 14 Nov 2000 32 who matt 33 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 34 descr 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. 38 kcah 39 40 hack xterm vs. libterm 41 mdate 01 Aug 2000 42 who jdc 43 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 44 pr 10383 45 descr 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. 51 kcah 52 53 hack wi-at-big-endian-bus 54 cdate 15 Mar 2002 55 who martin 56 file dev/ic/wireg.h 57 descr 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. 61 kcah 62 63 hack specific knowledge of colours in curses code 64 cdate Sun Apr 6 11:05:24 BST 2003 65 who jdc 66 file lib/libcurses/color.c : r1.24 67 descr 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 72 kcah 73 74 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 75 cdate 21 Aug 2003 76 who he 77 file sys/miscfs/procfs/procfs_linux.c : 1.14 78 descr 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. 85 kcah 86 87 hack GCC2 isn't C99 88 cdate 5 December 2003 89 who mrg 90 file gnu/dist/binutils/ld/ldlex.c: r1.2 91 descr 92 ldlex.c is generated from ldlex.l and we get macro redefinition 93 errors from it if __STDC_VERSION__ is not C99 compliant. This 94 hack forces NetBSD 1.6 and later systems to also include <stdint.h> 95 to get the relevant definitions. This hack should be backed out 96 when all platforms have switched away from GCC2. 97 kcah 98 99 hack gcc-strict-aliasing 100 cdate 6 August 2004 101 who junyoung 102 pr 26516 103 file src/usr.sbin/racoon/racoon/Makefile : 1.21 104 descr 105 GCC issues a warning "dereferencing type-punned pointer will break 106 strict-aliasing rules" when compiling 107 crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this 108 is due to use of type casting in a non-standard way in the code and 109 not a compiler bug. Once a new release of KAME with a proper fix 110 applied is imported this should be backed out. 111 kcah 112 113 hack gcc4 wrong uninitialised variable 114 mdate 10 May 2006 115 who mrg 116 file bin/ksh/eval.c : 1.6 117 file bin/sh/histedit.c : 1.39 118 file bin/sh/parser.c : 1.60 119 file bin/systrace/systrace.c : 1.33 120 file crypto/dist/heimdal/kdc/524.c : 1.10 121 file crypto/dist/ssh/sftp.c : 1.20 122 file crypto/dist/ssh/ssh-keysign.c : 1.11 123 file dist/ipf/lib/hostname.c : 1.2 124 file dist/ipf/tools/ipmon.c : 1.8 125 file dist/ntp/ntpd/refclock_shm.c : 1.4 126 file dist/ntp/sntp/timing.c : 1.3 127 file dist/pppd/pppstats/pppstats.c : 1.3 128 file dist/smbfs/lib/smb/rap.c : 1.6 129 file dist/tcpdump/print-zephyr.c : 1.5 130 file gnu/libexec/uucp/uucico/uucico.c : 1.6 131 file lib/libc/citrus/citrus_csmapper.c : 1.6 132 file lib/libc/citrus/citrus_pivot_factory.c : 1.5 133 file lib/libc/inet/inet_cidr_ntop.c : 1.3 134 file lib/libc/inet/inet_ntop.c : 1.3 135 file lib/libc/stdio/vfwprintf.c : 1.8 136 file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39 137 file sbin/fsck_ext2fs/dir.c : 1.19 138 file sbin/routed/rtquery/rtquery.c : 1.18 139 file sys/crypto/cast128/cast128.c : 1.9 140 file sys/ddb/db_command.c : 1.86 141 file sys/dev/fss.c : 1.25 142 file sys/dev/ic/midway.c : 1.71 143 file sys/dev/pci/machfb.c : 1.45 144 file sys/dist/ipf/netinet/ip_nat.c : 1.10 145 file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8 146 file sys/dist/pf/net/pf.c : 1.22 147 file sys/kern/kern_sig.c : 1.219 148 file sys/kern/tty.c : 1.181 149 file sys/net/bpf.c : 1.116 150 file sys/net/zlib.c : 1.26 151 file sys/netinet/in.c : 1.107 152 file sys/netsmb/smb_smb.c : 1.27 153 file sys/netsmb/smb_trantcp.c : 1.22 154 file sys/nfs/nfs_serv.c : 1.108 155 file sys/nfs/nfs_socket.c : 1.129 156 file sys/nfs/nfs_syscalls.c : 1.91 157 file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)] 158 file usr.bin/ftp/ftp.c : 1.140 159 file usr.bin/find/function.c : 1.54 160 file usr.bin/mail/tty.c : 1.20 161 file usr.bin/nl/nl.c : 1.7 162 file usr.bin/systat/keyboard.c : 1.23 163 file usr.bin/usbhidctl/usbhid.c : 1.29 164 file usr.bin/vi/cl/cl_read.c : 1.5 165 file usr.bin/vi/ex/ex_cscope.c : 1.12 166 file usr.bin/vi/ex/ex_tag.c : 1.19 167 file usr.bin/vi/vi/v_txt.c : 1.15 168 file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4 169 file usr.sbin/cron/do_command.c : 1.19 170 file usr.sbin/timed/timed/slave.c : 1.15 171 descr 172 GCC 4.1 gets many uninitialised variable warnings wrong. We should 173 really audit all the old hacks like this when older compilers are 174 removed from the tree, as many are probably no longer required. 175 kcah 176 177 178 port vax 179 180 hack gcc 2.95/vax doesn't like abort being used as function pointer 181 cdate Tue Dec 13 05:54:50 GMT 2005 182 who jmc 183 file lib/libc/rpc/svc_vc.c 1.15 184 descr 185 Provide a local definition for abort which doesn't include 186 the noreturn attribute which trips up gcc 2.95 on vax. 187 188 hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it 189 cdate Mon May 9 12:16:22 CDT 2005 190 who jmc 191 file gnu/usr.bin/gettext/Makefile.inc.prog 1.5 192 gnu/usr.bin/gettext/libgrep/Makefile 1.3 193 gnu/usr.bin/gettext/libnlspr/Makefile 1.5 194 gnu/usr.bin/gettext/libnlsut/Makefile 1.3 195 descr 196 The latest gettext assumes a C99 environment or at least 197 configure checks to work around this. As we don't use configure 198 provide a stdbool.h for vax builds locally in directories from 199 the template provided by the gettext code. 200 201 hack gcc 2.95/vax can't handle __used__ in mcount.c 202 cdate Fri May 6 14:30:53 CDT 2005 203 who jmc 204 file src/lib/libc/gmon/mcount.c 1.17 205 descr 206 Recent changes to mark this as __used__ to prevent optimization 207 away on sparc64 don't work on 2.95 vax. Ifdef'd back in the 208 old __unused__ if on vax. 209 210 hack gcc 2.95/vax cannot handle __builtin_ffs() 211 cdate Fri Aug 23 21:31:15 CEST 2002 212 who ragge 213 file sys/lib/libkern/libkern.h : 1.42 214 descr 215 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 216 added this feature to GCC 3 so it can be removed when switching. 217 218 219 hack gcc-vax-libbz2 220 mdate 27 Jun 2002 221 who thorpej 222 file lib/libbz2/Makefile 223 descr 224 libbz2 is mis-compiled with optimization with GCC 2.95.3 225 on VAX. -O0 works around this problem. 226 kcah 227 228 hack gawk 229 mdate 8 Nov 2003 230 who ragge 231 file gnu/usr.bin/gawk/Makefile 232 descr 233 gawk is mis-compiled with optimization with GCC 2.95.3 234 on VAX. -O0 works around this problem. 235 kcah 236 237 hack vax Toolchain bug 238 cdate 28 Mar 2003 239 who he 240 file sys/arch/vax/vax/intvec.S : 1.5 241 descr 242 Workaround for PR toolchain/20924. The assembler apparently 243 tries to range-check byte offsets when it doesn't have 244 sufficient information to make that decision. 245 Workaround uses `brw' instead of `brb' instruction. 246 kcah 247 248 hack vax gcc 2.95.3 -Wuninitialized workarounds 249 cdate 6 Nov 2003 250 who he 251 file sys/dev/bi/if_ni.c : 1.22 252 file sys/arch/vax/vax/ctu.c : 1.20 253 descr 254 Workaround for gcc 2.95.3 failing to detect that certain 255 variables will be initialized; so that this code compiles 256 with -Wuninitialized. Should be reviewed and possibly 257 reverted when gcc 3.3.2 is ready for vax. 258 kcah 259 260 hack vax gcc 2.95.3 structure initialization 261 cdat 13 May 2004 262 who cl 263 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 264 descr 265 Workaround for gcc 2.95.3 failing to initialize structures 266 and/or unions inside structures using nested designators. 267 Should be reverted when gcc >=3.3.3 is ready for vax. 268 kcah 269 270 hack vax gcc 2.95.3 needs -I. to build nslexer.c 271 cdat 6 Jun 2004 272 who mhitch 273 file lib/libc/arch/vax/Makefile.inc : 1.6 274 descr 275 It appears necessary to add -I. to CPPFLAGS when building 276 nslesxer.c. This may be caused by gcc 2.95.3 being used. 277 Should be reverted when a newer gcc is ready for vax. 278 kcah 279 280 hack vax gcc 2.95.3 doesn't understand "-std=c99" 281 cdat 5 April 2005 282 who tron 283 file src/share/mk/bsd.sys.mk 284 descr 285 We cannot use "-std=c99" for compiler warning level 4 and above 286 because gcc 2.95.3 doesn't support that option. 287 kcah 288 289 hack declare boolean_t in two IPF user-mode programs 290 cdate Tue Mar 7 19:19:20 CET 2006 291 who he 292 file dist/ipf/ipsend/iptests.c : 1.8 293 dist/ipf/ipsend/sock.c : 1.7 294 descr 295 The IPF user-mode programs ipsend and iptest first 296 include <sys/types.h> without _KERNEL defined, and 297 later include <sys/file.h> with _KERNEL defined. 298 This causes a build failure when building for vax, 299 since <sys/device.h> ends up being included without 300 bollean_t being defined by <sys/types.h>. 301 Build failure and further details documented in 302 PR#32907. 303 kcah 304 305 port sparc64 306 307 hack binutil-2.11-sparc64-pltrela 308 mdate 14 Aug 2001 309 who eeh 310 file libexec/ld.elf_so/arch/sparc64/mdreloc.c 311 descr 312 The first four PLT entries are reserved. There is some 313 disagreement whether they should have associated relocation 314 entries. Both the SPARC 32-bit and 64-bit ELF specifications 315 say that they should have relocation entries, but the 32-bit 316 SPARC binutils do not generate them, and now the 64-bit SPARC 317 binutils have stopped generating them too. 318 319 To provide binary compatibility, we will check the first entry, 320 if it is reserved it should not be of the type JMP_SLOT. If it 321 is JMP_SLOT, then the 4 reserved entries were not generated and 322 our index is 4 entries too far, so we frob the rela pointer. 323 kcah 324 325 326 port arm 327 328 hack gcc-unsigned-compare 329 cdate 09 Mar 2002 330 mdate 18 Mar 2002 331 who bjh21 332 file dist/bind/lib/nameser/ns_parse.c : 1.3 333 file dist/dhcp/minires/ns_parse.c : 1.3 334 file dist/dhcp/omapip/result.c : 1.2 335 file dist/dhcp/server/failover.c : 1.3 336 file gnu/dist/gawk/eval.c : 1.4 337 file gnu/dist/toolchain/bfd/bfd.c : 1.2 338 file gnu/dist/toolchain/bfd/format.c : 1.2 339 file gnu/dist/toolchain/gdb/target.c : 1.2 340 file sys/kern/vfs_subr.c : 1.172 341 descr When checking that a potentially-unsigned enum is >= 0, assign 342 it to an int first. This is necessary to avoid "comparison is 343 always true" warnings with -fshort-enums. Casting to an int 344 really should be enough, but turns out not to be. 345 kcah 346 347 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 348 cdate Tue Oct 28 18:02:16 GMT 2003 349 who skrll 350 pr 23044 351 file sys/arch/arm/conf/Makefile.arm : 1.19 352 descr 353 Performing a build.sh tools on a CATS with NFS mounted 354 obj and src directories results in "panic: receive 1" 355 The hack is to compile sys/kern/uipc_socket.c with 356 -fno-strict-aliasing 357 kcah 358 359 360 port pc532 361 362 hack egcs-pc532-ip6_mroute 363 cdate 09 Jul 2002 364 who simonb 365 file sys/arch/pc532/conf/Makefile.pc532 : 1.70 366 file sys/arch/pc532/conf/files.pc532 : 1.47 367 descr 368 egcs 1.1.2 gets an "internal error--insn does not satisfy its 369 constraints" error compiling ip6_mroute.c with -O2 or greater. 370 -O1 works around this problem. 371 kcah 372 373 hack gcc-pc532-duffs_device 374 cdate Mon Oct 27 07:23:05 UTC 2003 375 who simonb 376 file sys/arch/pc532/conf/Makefile.pc532 : 1.71 377 file sys/arch/pc532/conf/files.pc532 : 1.52 378 pr GCC PR optimization/5230 379 descr 380 gcc incorrectly gives an "unreachable code at beginning of 381 switch statement" for a Duff's device construct in 382 arch/pc532/dev/ncr.c. There is no way to disable just this 383 warning, so -Wno-error is turned on for this file. 384 kcah 385 386 hack gcc332-cppmacro-ice 387 cdate Sun Dec 7 12:48:33 UTC 2003 388 who simonb 389 file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2 390 descr 391 gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2. 392 The hack is to use -O1 for this file. Fixed in gcc 393 -current mainline, unable to work out where the fix is 394 right now. 395 kcah 396 397 398 port sh3 399 400 hack gcc-sh3-sed 401 mdate 23 Apr 2002 402 who thorpej 403 file usr.bin/sed/Makefile : 1.9 : 9 : 13 404 descr 405 The in-tree GCC 2.95.3-based compiler ICEs when building 406 with optimization for SuperH. Hack is to build with -O0. 407 kcah 408 409 410 port sh5 411 412 hack SuperH SH5 Toolchain Bugs 413 cdate 11 Jul 2002 414 who scw 415 file usr.sbin/ndbootd/ndbootd.c : 1.6 416 file usr.sbin/traceroute/traceroute.c : 1.48 417 descr 418 The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal 419 compiler error when assigning a bit-wise inverted value 420 under some circumstances. 421 Work around it by splitting the statement into two. 422 kcah 423 424 hack SuperH SH5 Toolchain Bugs 425 cdate 17 May 2003 426 who scw 427 file lib/libpthread/pthread_lock.c : 1.7 428 descr 429 The SuperH SH5 toolchain generates incorrect PIC code when 430 faced with a symbol which is declared extern, but has local 431 scope due to being defined within an asm() statement (without 432 being declared .globl in that statement). Work around it by 433 adding the .globl. 434 kcah 435 436 hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2 437 cdate Sun Dec 7 19:44:05 GMT 2003 438 who scw 439 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 440 descr 441 Gcc3 for sh5 gets an ICE compiling reload1.c at -O2. 442 Drop to -O1 for now when building for sh5. 443 kcah 444 445 hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2 446 cdate Sun Dec 7 21:10:46 GMT 2003 447 who scw 448 file gnu/lib/libbfd/Makefile : 1.39 449 descr 450 Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c 451 and elf64.c at -O2. 452 Drop to -O1 for now when building for sh5. 453 kcah 454 455 456 hack gcc 3.3.2 on sh5 - fatal warning compiling function.c 457 cdate Sun Dec 7 19:44:05 GMT 2003 458 who scw 459 file gnu/usr.bin/gcc3/backend/Makefile : 1.13 460 descr 461 Gcc3 for sh5 issues a warning: 462 .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of 463 mutually exclusive equal-tests is always 0. 464 This causes the build to fail because of -Werror. 465 Work-around by defining NOGCCERROR when building for sh5. 466 kcah 467 468 hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c 469 cdate Thu Nov 11 00:35:33 UTC 2004 470 who he 471 file usr.sbin/bind/libdns/Makefile/1.2 472 descr 473 Gcc3 for sh5 gets an ICE compiling these files at -O2. 474 Drop to -O1 for now when building for sh5. 475 kcah 476 477 hack gcc 3.3.3 nb3 on sh5 - ICE compiling bsd-comp.c 478 cdate Thu May 25 23:05:20 UTC 2005 479 who he 480 file sys/lkm/net/bsdcomp/Makefile : 1.3 481 descr 482 Gcc3 for sh5 gets an ICE compiling this at -O2, 483 "could not split insn". Drop to -O1 for sh5. 484 kcah 485 486 hack gcc 3.3.3 nb3 on sh5 - ICE compiling strtod.c 487 cdate Tue Jan 31 10:51:52 GMT 2006 488 who scw 489 file lib/libc/gdtoa/Makefile.inc : 1.2 490 descr 491 Gcc3 for sh5 gets an ICE compiling this at -O2, 492 "could not split insn". Drop to -O1 for sh5. 493 kcah 494 495 port sun2 496 497 hack gcc 3.3.2/mdsetimage 498 cdate Tue Oct 28 18:43:05 EST 2003 499 who fredette 500 file gnu/usr.sbin/mdsetimage/Makefile : 1.15 501 descr 502 mdsetimage.c causes cc1 to barf for as-yet unknown reasons. 503 this hack uses -O0 to avoid the problem. 504 kcah 505 506 hack gcc 3.3.2/installboot/ffs.c 507 cdate Tue Oct 28 18:43:05 EST 2003 508 who fredette 509 file usr.sbin/installboot/Makefile : 1.26 510 descr 511 ffs.c causes cc1 to barf for as-yet unknown reasons. this 512 hack uses -O0 to avoid the problem. 513 kcah 514 515 516 port m68000 517 518 hack gcc 3.3.2/gcc/ra-colorize.c 519 cdate Wed Nov 5 11:03:13 EST 2003 520 who mrg 521 file gnu/usr.bin/gcc3/backend/Makefile : 1.11 522 descr 523 ra-colorize.c causes a whole spew of unreferenced .L* local 524 symbols. using -O0 (or even -O2 reportedly) avoids the problem. 525 Note this has been fixed in 3.3.3 at least on m68k, 526 but it hasn't been confirmed on sun2/m68000. 527 (it's too slow even on emulator and unlikely to build 528 toolchains on sun2 with its maximum 4MB RAM) 529 kcah 530 531 port sparc64 532 533 hack disable optimzations for uvm_bio.c on 32 bit kernels 534 cdate Sun Mar 21 14:14:04 MET 2004 535 who martin 536 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 537 file sys/arch/sparc64/conf/files.sparc64 : 1.93 538 descr 539 The sparc compiler miscompiles uvm_bio.c when using 540 any optimization. This results in ubc_release panics. 541 kcah 542 543 port macppc 544 545 hack remove inline from rotate_{left,right} 546 cdate Tue Feb 22 13:43:25 EST 2005 547 who christos 548 file src/dist/bind/lib/dns/rbt.c 549 descr 550 The macppc gcc-3.3 compiler miscompiles rbt.c when these 551 functions are inlined. The error is: 552 .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed 553 .* named[368]: exiting (due to assertion failure) 554 This is reportedly fixed in gcc-3.4 555 kcah 556 557 port hppa 558 559 hack hppa-gcc-3.3.3/grep/dfa.c 560 cdate Sun Aug 8 08:34:32 PDT 2004 561 who chs 562 file gnu/usr.bin/grep/grep/Makefile : 1.4 563 descr 564 gcc 3.3.3 generates bad code for dfa.c with -O2, 565 reduce optimization to -O1 to avoid the bug. 566 kcah 567 568 hack hppa-gcc-3.3.3 / make/buf.c 569 cdate Mon May 8 13:02:36 CEST 2006 570 who he 571 file usr.bin/make/Makefile : 1.34 572 descr 573 gcc 3.3.3 nb3 gets an "unrecognized insn" internal 574 compiler error when building this file with -O2, 575 reduce optimization to -O1 to avoid the bug. 576 kcah 577 578 hack hppa boot-from-disk memory corruption 579 cdate Wed May 18 06:56:07 PDT 2005 580 who chs 581 file src/sys/dev/scsipi/scsipiconf.h : 1.98 582 descr 583 There is some bug with DMA on hppa that corrupts scsipi_xfer 584 structures, but it only shows up when booting from disk. 585 For now, we'll add some padding to scsipi_xfer so that 586 the corrupted memory is not otherwise used. 587 kcah 588 589 port mips 590 591 hack mips-shared-linker-load-address 592 cdate Fri Oct 7 08:33:10 UTC 2005 593 who simonb 594 file src/sys/kern/exec_elf32.c : 1.107 595 descr 596 With COMPAT_16 or previous enabled (which enables 597 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 598 load and run at address 0. The check to fix this in 599 rev 1.107 only checks the first psection of the ELF 600 executable, which may not be loadable. A more correct 601 fix is to check the first loadable psection instead of 602 just the first psection. 603 kcah 604 605
Indexes created Fri Aug 14 00:25:39 UTC 2026