HACKS revision 1.105
1 # $NetBSD: HACKS,v 1.105 2008/07/21 10:00:51 agc 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 gcc-strict-aliasing 88 cdate 6 August 2004 89 who junyoung 90 pr 26516 91 file src/usr.sbin/racoon/racoon/Makefile : 1.21 92 descr 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. 99 kcah 100 101 hack gcc4 wrong uninitialized variable 102 mdate 10 May 2006 103 who mrg 104 file bin/ksh/eval.c : 1.6 105 file bin/sh/histedit.c : 1.39 106 file bin/sh/parser.c : 1.60 107 file crypto/dist/heimdal/kdc/524.c : 1.10 108 file crypto/dist/ssh/sftp.c : 1.20 109 file crypto/dist/ssh/ssh-keysign.c : 1.11 110 file dist/ipf/lib/hostname.c : 1.2 111 file dist/ipf/tools/ipmon.c : 1.8 112 file dist/ntp/ntpd/ntp_request.c : 1.4 113 file dist/ntp/ntpd/refclock_shm.c : 1.4 114 file dist/ntp/sntp/timing.c : 1.3 115 file dist/pppd/pppstats/pppstats.c : 1.3 116 file dist/smbfs/lib/smb/rap.c : 1.6 117 file dist/tcpdump/print-zephyr.c : 1.5 118 file distrib/utils/sysinst/aout2elf.c : 1.12 119 file gnu/libexec/uucp/uucico/uucico.c : 1.6 120 file lib/libc/citrus/citrus_csmapper.c : 1.6 121 file lib/libc/citrus/citrus_pivot_factory.c : 1.5 122 file lib/libc/inet/inet_cidr_ntop.c : 1.3 123 file lib/libc/inet/inet_ntop.c : 1.3 124 file lib/libc/stdio/vfwprintf.c : 1.8 125 file libexec/ld.elf_so/arch/m68k/mdreloc.c : 1.20 126 file libexec/ld.elf_so/arch/powerpc/ppc_reloc.c : 1.40 127 file libexec/ld.elf_so/arch/sh3/mdreloc.c : 1.22 128 file libexec/ld.elf_so/arch/sparc/mdreloc.c : 1.39 129 file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39 130 file libexec/ld.elf_so/arch/vax/mdreloc.c : 1.21 131 file libexec/ld.elf_so/arch/x86_64/mdreloc.c : 1.27 132 file sbin/fsck_ext2fs/dir.c : 1.19 133 file sbin/routed/rtquery/rtquery.c : 1.18 134 file sys/arch/amd64/amd64/pmap.c : 1.26 135 file sys/arch/i386/pci/piixpcib.c : 1.4 136 file sys/arch/m68k/m68k/pmap_motorola.c : 1.4 137 file sys/crypto/cast128/cast128.c : 1.9 138 file sys/ddb/db_command.c : 1.86 139 file sys/dev/cardbus/cardbus_map.c : 1.21 140 file sys/dev/fss.c : 1.25 141 file sys/dev/ic/igsfb.c : 1.39 142 file sys/dev/ic/mb86950.c : 1.5 143 file sys/dev/ic/midway.c : 1.71 144 file sys/dev/kttcp.c : 1.18 145 file sys/dev/rasops/rasops_bitops.h : 1.9 146 file sys/dev/pci/cmpci.c : 1.31 147 file sys/dev/pci/machfb.c : 1.45 148 file sys/dev/usb/ohci.c : 1.174 149 file sys/dev/usb/uhci.c : 1.196 150 file sys/dev/rasops/rasops_bitops.h : 1.9 151 file sys/dist/ipf/netinet/ip_nat.c : 1.10 152 file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8 153 file sys/dist/pf/net/pf.c : 1.22 154 file sys/fs/udf/udf_vnops.c : 1.4 155 file sys/kern/kern_sig.c : 1.219 156 file sys/kern/tty.c : 1.181 157 file sys/net/bpf.c : 1.116 158 file sys/net/zlib.c : 1.26 159 file sys/netccitt/if_x25subr.c : 1.37 160 file sys/netinet/in.c : 1.107 161 file sys/netsmb/smb_smb.c : 1.27 162 file sys/netsmb/smb_trantcp.c : 1.22 163 file sys/nfs/nfs_serv.c : 1.108 164 file sys/nfs/nfs_socket.c : 1.129 165 file sys/nfs/nfs_syscalls.c : 1.91 166 file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)] 167 file usr.bin/ftp/ftp.c : 1.140 168 file usr.bin/find/function.c : 1.54 169 file usr.bin/mail/tty.c : 1.20 170 file usr.bin/msgc/msg_sys.def : 1.33-1.34 171 file usr.bin/nl/nl.c : 1.7 172 file usr.bin/systat/keyboard.c : 1.23 173 file usr.bin/usbhidctl/usbhid.c : 1.29 174 file usr.bin/vi/cl/cl_read.c : 1.5 175 file usr.bin/vi/ex/ex_cscope.c : 1.12 176 file usr.bin/vi/ex/ex_tag.c : 1.19 177 file usr.bin/vi/vi/v_txt.c : 1.15 178 file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4 179 file usr.sbin/cron/do_command.c : 1.19 180 file usr.sbin/timed/timed/slave.c : 1.15 181 descr 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. 190 kcah 191 192 hack gcc4 pointer sign and strict aliasing problems 193 mdate 10 May 2006 194 who mrg 195 file bin/ed/Makefile : 1.33 196 file distrib/utils/sysinst/Makefile.inc : 1.44 197 file distrib/utils/x_dhclient/Makefile : 1.15 198 file games/bcd/Makefile : 1.5 199 file games/dab/Makefile : 1.5 200 file games/larn/Makefile : 1.17 201 file games/pom/Makefile : 1.5 202 file lib/libasn1/Makefile : 1.26 203 file lib/libcrypt/Makefile : 1.17 204 file lib/libgssapi/Makefile : 1.16 205 file lib/libhdb/Makefile : 1.20 206 file lib/libkadm5clnt/Makefile : 1.21 207 file lib/libkadm5srv/Makefile : 1.25 208 file lib/libkrb5/Makefile : 1.35 209 file lib/libssh/Makefile : 1.6 210 file lib/libtelnet/Makefile : 1.26 211 file libexec/getty/Makefile : 1.14 212 file libexec/kadmind/Makefile : 1.19 213 file libexec/kpasswdd/Makefile : 1.14 214 file sbin/atactl/Makefile : 1.3 215 file sbin/cgdconfig/Makefile : 1.7 216 file sbin/clri/Makefile : 1.13 217 file sbin/dkctl/Makefile : 1.4 218 file sbin/dump/Makefile : 1.33 219 file sbin/fdisk/Makefile : 1.35 220 file sbin/fsck_ext2fs/Makefile : 1.11 221 file sbin/fsck_ffs/Makefile : 1.29 222 file sbin/fsdb/Makefile : 1.18 223 file sbin/mount_smbfs/Makefile : 1.4 224 file sbin/newfs/Makefile : 1.30 225 file sbin/newfs_sysvbfs/Makefile : 1.2 226 file sbin/restore/Makefile : 1.23 227 file sbin/veriexecctl/Makefile : 1.11 228 file sys/lib/libsa/Makefile : 1.59 229 file sys/arch/evbarm/adi_brh/brh_machdep.c : 1.24 230 file usr.bin/awk/Makefile : 1.9 231 file usr.bin/crontab/Makefile : 1.24 232 file usr.bin/ctags/Makefile : 1.8 233 file usr.bin/gzip/Makefile : 1.10 234 file usr.bin/ssh/sftp/Makefile : 1.10 235 file usr.bin/ssh/ssh/Makefile : 1.25 236 file usr.bin/vi/build/Makefile : 1.26 237 file usr.bin/telnet/Makefile : 1.40 238 file usr.bin/tn3270/tn3270/Makefile : 1.36 239 file usr.bin/tr/Makefile : 1.4 240 file usr.sbin/amd/amd/Makefile : 1.27 241 file usr.sbin/amd/amq/Makefile : 1.14 242 file usr.sbin/amd/libamu/Makefile : 1.20 243 file usr.sbin/amd/pawd/Makefile : 1.5 244 file usr.sbin/bind/Makefile.inc : 1.22 245 file usr.sbin/bind/libdns/Makefile : 1.3 246 file usr.sbin/bind/named/Makefile : 1.17 247 file usr.sbin/bootp/bootptest/Makefile : 1.2 248 file usr.sbin/chrtbl/Makefile : 1.6 249 file usr.sbin/cron/Makefile : 1.12 250 file usr.sbin/dhcp/Makefile.inc : 1.20 251 file usr.sbin/dumplfs/Makefile : 1.11 252 file usr.sbin/hprop/Makefile : 1.13 253 file usr.sbin/installboot/Makefile : 1.35 254 file usr.sbin/ipf/ipftest/Makefile : 1.32 255 file usr.sbin/isdn/isdnd/Makefile : 1.6 256 file usr.sbin/isdn/isdnmonitor/Makefile : 1.3 257 file usr.sbin/isdn/isdntel/Makefile : 1.2 258 file usr.sbin/isdn/isdntrace/Makefile : 126 259 file usr.sbin/mopd/common/Makefile : 1.10 260 file usr.sbin/mopd/mopd/Makefile : 1.9 261 file usr.sbin/mopd/mopprobe/Makefile : 1.7 262 file usr.sbin/makefs/Makefile : 1.17 263 file usr.sbin/mscdlabel/Makefile : 1.5 264 file usr.sbin/pkg_install/add/Makefile : 1.7 265 file usr.sbin/pkg_install/create/Makefile : 1.5 266 file usr.sbin/pkg_install/lib/Makefile : 1.28 267 file usr.sbin/ntp/ntpd/Makefile : 1.10/1.11 268 file usr.sbin/ntp/ntptime/Makefile : 1.4/1.5 269 file usr.sbin/pppd/Makefile.inc : 1.3 270 file usr.sbin/pppd/pppd/Makefile : 1.38 271 file usr.sbin/rarpd/Makefile : 1.10 272 file usr.sbin/rbootd/Makefile : 1.10 273 file usr.sbin/rpc.pcnfsd/Makefile : 1.17 274 file usr.sbin/rtadvd/Makefile : 1.9 275 file usr.sbin/tcpdump/Makefile : 1.42 276 file usr.sbin/wiconfig/Makefile : 1.3 277 descr 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. 281 kcah 282 283 hack cross-building hack on Darwin 284 mdate 20 July 2008 285 who agc 286 file src/distrib/common/Makefile.mdset : 1.33 287 descr 288 Darwin has problems with getopt() when used in mdsetimage -v, 289 due to the difference between BSD and libiberty() getopt 290 implementations, more fully described in 291 http://mail-index.netbsd.org/current-users/2008/06/27/msg003242.html 292 and the subsequent thread. For just now, we just have an ugly 293 workaround not to call mdsetimage with the -v argument on Darwin 294 kcah 295 296 port vax 297 298 hack gcc4/vax ICE 299 cdate 300 who tsutsui 301 file sys/arch/vax/conf/Makefile.vax 302 descr 303 GCC4 on vax gets ICE on compiling sys/ddb/db_command.c. 304 -fno-tree-ter prevents it so add it to COPTS. 305 kcah 306 307 hack gcc4/vax compiler crash 308 cdate Fri Jun 30 22:39:12 PDT 2006 309 who mrg 310 file bin/csh/Makefile : 1.27 311 file lib/i18n_module/UTF7/Makefile : 1.2 312 descr 313 GCC4 on vax crashes. -O0 stops it happening so far... 314 kcah 315 316 hack gcc 2.95/vax doesn't like abort being used as function pointer 317 cdate Tue Dec 13 05:54:50 GMT 2005 318 who jmc 319 file lib/libc/rpc/svc_vc.c 1.15 320 descr 321 Provide a local definition for abort which doesn't include 322 the noreturn attribute which trips up gcc 2.95 on vax. 323 kcah 324 325 hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it 326 cdate Mon May 9 12:16:22 CDT 2005 327 who jmc 328 file gnu/usr.bin/gettext/Makefile.inc.prog 1.5 329 gnu/usr.bin/gettext/libgrep/Makefile 1.3 330 gnu/usr.bin/gettext/libnlspr/Makefile 1.5 331 gnu/usr.bin/gettext/libnlsut/Makefile 1.3 332 descr 333 The latest gettext assumes a C99 environment or at least 334 configure checks to work around this. As we don't use configure 335 provide a stdbool.h for vax builds locally in directories from 336 the template provided by the gettext code. 337 kcah 338 339 hack gcc 2.95/vax cannot handle __builtin_ffs() 340 cdate Fri Aug 23 21:31:15 CEST 2002 341 who ragge 342 file sys/lib/libkern/libkern.h : 1.42 343 descr 344 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 345 added this feature to GCC 3 so it can be removed when switching. 346 kcah 347 348 hack gcc 2.95/vax libbz2 349 mdate 27 Jun 2002 350 who thorpej 351 file lib/libbz2/Makefile 352 descr 353 libbz2 is mis-compiled with optimization with GCC 2.95.3 354 on VAX. -O0 works around this problem. 355 kcah 356 357 hack vax Toolchain bug 358 cdate 28 Mar 2003 359 who he 360 file sys/arch/vax/vax/intvec.S : 1.5 361 descr 362 Workaround for PR toolchain/20924. The assembler apparently 363 tries to range-check byte offsets when it doesn't have 364 sufficient information to make that decision. 365 Workaround uses `brw' instead of `brb' instruction. 366 kcah 367 368 hack vax gcc 2.95.3 -Wuninitialized workarounds 369 cdate 6 Nov 2003 370 who he 371 file sys/dev/bi/if_ni.c : 1.22 372 file sys/arch/vax/vax/ctu.c : 1.20 373 descr 374 Workaround for gcc 2.95.3 failing to detect that certain 375 variables will be initialized; so that this code compiles 376 with -Wuninitialized. Should be reviewed and possibly 377 reverted when gcc 3.3.2 is ready for vax. 378 kcah 379 380 hack vax gcc 2.95.3 structure initialization 381 cdat 13 May 2004 382 who cl 383 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 384 descr 385 Workaround for gcc 2.95.3 failing to initialize structures 386 and/or unions inside structures using nested designators. 387 Should be reverted when gcc >=3.3.3 is ready for vax. 388 kcah 389 390 hack vax gcc 2.95.3 needs -I. to build nslexer.c 391 cdat 6 Jun 2004 392 who mhitch 393 file lib/libc/arch/vax/Makefile.inc : 1.6 394 descr 395 It appears necessary to add -I. to CPPFLAGS when building 396 nslesxer.c. This may be caused by gcc 2.95.3 being used. 397 Should be reverted when a newer gcc is ready for vax. 398 kcah 399 400 hack vax gcc 2.95.3 doesn't understand "-std=c99" 401 cdat 5 April 2005 402 who tron 403 file src/share/mk/bsd.sys.mk 404 descr 405 We cannot use "-std=c99" for compiler warning level 4 and above 406 because gcc 2.95.3 doesn't support that option. 407 kcah 408 409 hack declare boolean_t in two IPF user-mode programs 410 cdate Tue Mar 7 19:19:20 CET 2006 411 who he 412 file dist/ipf/ipsend/iptests.c : 1.8 413 dist/ipf/ipsend/sock.c : 1.7 414 descr 415 The IPF user-mode programs ipsend and iptest first 416 include <sys/types.h> without _KERNEL defined, and 417 later include <sys/file.h> with _KERNEL defined. 418 This causes a build failure when building for vax, 419 since <sys/device.h> ends up being included without 420 bollean_t being defined by <sys/types.h>. 421 Build failure and further details documented in 422 PR#32907. 423 kcah 424 425 hack pcc 0.9.9 large string literals 426 cdat 8 July 2008 427 who gmcgarry 428 file sys/conf/param.c : 1.58 429 descr 430 Workaround for pcc 0.9.9 not handling large string literals 431 which causes kernels with 'options INCLUDE_CONFIG_FILE' to 432 fail compilation. 433 There is a proposal on the pcc mailing list to stuff config 434 file in ELF section. 435 kcah 436 437 port arm 438 439 hack gcc-unsigned-compare 440 cdate 09 Mar 2002 441 mdate 18 Mar 2002 442 who bjh21 443 file dist/bind/lib/nameser/ns_parse.c : 1.3 444 file dist/dhcp/minires/ns_parse.c : 1.3 445 file dist/dhcp/omapip/result.c : 1.2 446 file dist/dhcp/server/failover.c : 1.3 447 file gnu/dist/toolchain/bfd/bfd.c : 1.2 448 file gnu/dist/toolchain/bfd/format.c : 1.2 449 file gnu/dist/toolchain/gdb/target.c : 1.2 450 file sys/kern/vfs_subr.c : 1.172 451 descr When checking that a potentially-unsigned enum is >= 0, assign 452 it to an int first. This is necessary to avoid "comparison is 453 always true" warnings with -fshort-enums. Casting to an int 454 really should be enough, but turns out not to be. 455 kcah 456 457 458 port sh3 459 460 hack gcc4-sh3-bz2 461 cdate Sun May 21 03:34:57 UTC 2006 462 mdate Fri May 16 13:13:00 UTC 2008 463 who mrg, tsutsui 464 file lib/libbz2/Makefile : 1.10 465 descr 466 The in-tree GCC 4.1-based compiler generated too-far 467 pc-relative addresses. Hack is to build with 468 -fno-loop-optimize. 469 kcah 470 471 472 port m68000 473 474 hack gcc4-m68000 475 cdate Fri Feb 8 10:29:37 PST 2008 476 mdate Sun May 4 15:37:19 UTC 2008 477 who mrg, tsutsui 478 file rescue/Makefile : 1.21 479 file sbin/dump_lfs/Makefile : 1.9 480 file sbin/fsck_ffs/Makefile : 1.35 481 file sbin/fsdb/Makefile : 1.22 482 file share/mk/sys.mk : 1.96 483 file usr.sbin/ndbootd/Makefile : 1.5 484 descr 485 Several internal compiler errors with gcc -O1 486 around 64bit integer arithmetic. 487 This hack uses -O1 and adds some -fno-tree-foo options 488 to avoid the problem. 489 This might be related with GCC Bugzilla Bug 32424. 490 kcah 491 492 493 port sparc64 494 495 hack disable optimzations for uvm_bio.c on 32 bit kernels 496 cdate Sun Mar 21 14:14:04 MET 2004 497 who martin 498 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 499 file sys/arch/sparc64/conf/files.sparc64 : 1.93 500 descr 501 The sparc compiler miscompiles uvm_bio.c when using 502 any optimization. This results in ubc_release panics. 503 kcah 504 505 port mips 506 507 hack mips-shared-linker-load-address 508 cdate Fri Oct 7 08:33:10 UTC 2005 509 who simonb 510 file src/sys/kern/exec_elf32.c : 1.107 511 descr 512 With COMPAT_16 or previous enabled (which enables 513 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 514 load and run at address 0. The check to fix this in 515 rev 1.107 only checks the first psection of the ELF 516 executable, which may not be loadable. A more correct 517 fix is to check the first loadable psection instead of 518 just the first psection. 519 kcah 520 521 hack mips-duplicate-ras-end-label 522 cdate Sat Sep 2 23:29:42 2006 523 who martin 524 file src/regress/sys/kern/ras/ras3/Makefile : 1.3 525 descr 526 Add -fno-reorder-blocks to CFLAGS to avoid duplicate 527 labels by duplicated __asm output from RAS_END() 528 macro. 529 kcah 530 531 port i386 532 533 hack use volatile intermediate variable to enforce rounding 534 cdate Tue Aug 1 22:15:55 MEST 2006 535 who drochner 536 file src/lib/libm/src/lrintf.c : 1.4 537 file src/lib/libm/src/s_rintf.c : 1.8 538 descr 539 gcc-4 does subsequent operations on "float" values within 540 the i387 FPU without rounding the intermediate results 541 kcah 542
Indexes created Wed Nov 05 21:10:10 GMT 2025