HACKS revision 1.100
1 # $NetBSD: HACKS,v 1.100 2008/04/27 03:33:06 tsutsui 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 port vax 284 285 hack gcc4/vax compiler crash 286 cdate Fri Jun 30 22:39:12 PDT 2006 287 who mrg 288 file bin/csh/Makefile : 1.27 289 file lib/i18n_module/UTF7/Makefile : 1.2 290 descr 291 GCC4 on vax crashes. -O0 stops it happening so far... 292 kcah 293 294 hack gcc 2.95/vax doesn't like abort being used as function pointer 295 cdate Tue Dec 13 05:54:50 GMT 2005 296 who jmc 297 file lib/libc/rpc/svc_vc.c 1.15 298 descr 299 Provide a local definition for abort which doesn't include 300 the noreturn attribute which trips up gcc 2.95 on vax. 301 kcah 302 303 hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it 304 cdate Mon May 9 12:16:22 CDT 2005 305 who jmc 306 file gnu/usr.bin/gettext/Makefile.inc.prog 1.5 307 gnu/usr.bin/gettext/libgrep/Makefile 1.3 308 gnu/usr.bin/gettext/libnlspr/Makefile 1.5 309 gnu/usr.bin/gettext/libnlsut/Makefile 1.3 310 descr 311 The latest gettext assumes a C99 environment or at least 312 configure checks to work around this. As we don't use configure 313 provide a stdbool.h for vax builds locally in directories from 314 the template provided by the gettext code. 315 kcah 316 317 hack gcc 2.95/vax cannot handle __builtin_ffs() 318 cdate Fri Aug 23 21:31:15 CEST 2002 319 who ragge 320 file sys/lib/libkern/libkern.h : 1.42 321 descr 322 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 323 added this feature to GCC 3 so it can be removed when switching. 324 kcah 325 326 hack gcc-vax-libbz2 327 mdate 27 Jun 2002 328 who thorpej 329 file lib/libbz2/Makefile 330 descr 331 libbz2 is mis-compiled with optimization with GCC 2.95.3 332 on VAX. -O0 works around this problem. 333 kcah 334 335 hack vax Toolchain bug 336 cdate 28 Mar 2003 337 who he 338 file sys/arch/vax/vax/intvec.S : 1.5 339 descr 340 Workaround for PR toolchain/20924. The assembler apparently 341 tries to range-check byte offsets when it doesn't have 342 sufficient information to make that decision. 343 Workaround uses `brw' instead of `brb' instruction. 344 kcah 345 346 hack vax gcc 2.95.3 -Wuninitialized workarounds 347 cdate 6 Nov 2003 348 who he 349 file sys/dev/bi/if_ni.c : 1.22 350 file sys/arch/vax/vax/ctu.c : 1.20 351 descr 352 Workaround for gcc 2.95.3 failing to detect that certain 353 variables will be initialized; so that this code compiles 354 with -Wuninitialized. Should be reviewed and possibly 355 reverted when gcc 3.3.2 is ready for vax. 356 kcah 357 358 hack vax gcc 2.95.3 structure initialization 359 cdat 13 May 2004 360 who cl 361 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 362 descr 363 Workaround for gcc 2.95.3 failing to initialize structures 364 and/or unions inside structures using nested designators. 365 Should be reverted when gcc >=3.3.3 is ready for vax. 366 kcah 367 368 hack vax gcc 2.95.3 needs -I. to build nslexer.c 369 cdat 6 Jun 2004 370 who mhitch 371 file lib/libc/arch/vax/Makefile.inc : 1.6 372 descr 373 It appears necessary to add -I. to CPPFLAGS when building 374 nslesxer.c. This may be caused by gcc 2.95.3 being used. 375 Should be reverted when a newer gcc is ready for vax. 376 kcah 377 378 hack vax gcc 2.95.3 doesn't understand "-std=c99" 379 cdat 5 April 2005 380 who tron 381 file src/share/mk/bsd.sys.mk 382 descr 383 We cannot use "-std=c99" for compiler warning level 4 and above 384 because gcc 2.95.3 doesn't support that option. 385 kcah 386 387 hack declare boolean_t in two IPF user-mode programs 388 cdate Tue Mar 7 19:19:20 CET 2006 389 who he 390 file dist/ipf/ipsend/iptests.c : 1.8 391 dist/ipf/ipsend/sock.c : 1.7 392 descr 393 The IPF user-mode programs ipsend and iptest first 394 include <sys/types.h> without _KERNEL defined, and 395 later include <sys/file.h> with _KERNEL defined. 396 This causes a build failure when building for vax, 397 since <sys/device.h> ends up being included without 398 bollean_t being defined by <sys/types.h>. 399 Build failure and further details documented in 400 PR#32907. 401 kcah 402 403 port arm 404 405 hack gcc-unsigned-compare 406 cdate 09 Mar 2002 407 mdate 18 Mar 2002 408 who bjh21 409 file dist/bind/lib/nameser/ns_parse.c : 1.3 410 file dist/dhcp/minires/ns_parse.c : 1.3 411 file dist/dhcp/omapip/result.c : 1.2 412 file dist/dhcp/server/failover.c : 1.3 413 file gnu/dist/toolchain/bfd/bfd.c : 1.2 414 file gnu/dist/toolchain/bfd/format.c : 1.2 415 file gnu/dist/toolchain/gdb/target.c : 1.2 416 file sys/kern/vfs_subr.c : 1.172 417 descr When checking that a potentially-unsigned enum is >= 0, assign 418 it to an int first. This is necessary to avoid "comparison is 419 always true" warnings with -fshort-enums. Casting to an int 420 really should be enough, but turns out not to be. 421 kcah 422 423 hack gcc 3.3.2/arm sys/kern/uipc_socket.c 424 cdate Tue Oct 28 18:02:16 GMT 2003 425 who skrll 426 pr 23044 427 file sys/arch/arm/conf/Makefile.arm : 1.19 428 descr 429 Performing a build.sh tools on a CATS with NFS mounted 430 obj and src directories results in "panic: receive 1" 431 The hack is to compile sys/kern/uipc_socket.c with 432 -fno-strict-aliasing 433 kcah 434 435 436 port sh3 437 438 hack gcc4-sh3-bz2 439 mdate 20 May 2006 440 who mrg 441 file lib/libbz2/Makefile : 1.10 442 descr 443 The in-tree GCC 4.1-based compiler generated too-far 444 pc-relative addresses. Hack is to build with -O0. 445 kcah 446 447 448 port m68000 449 450 hack gcc4-m68000 451 cdate Sun Apr 27 03:06:46 UTC 2008 452 who mrg, tsutsui 453 file rescue/Makefile : 1.21 454 file sbin/dump_lfs/Makefile : 1.9 455 file share/mk/sys.mk : 1.95 456 file usr.sbin/ndbootd/Makefile : 1.5 457 descr 458 Many errors across the tree with optimisation. 459 This hack uses -O1 and adds some -fno-tree-foo options 460 to avoid the problem. 461 kcah 462 463 464 port sparc64 465 466 hack disable optimzations for uvm_bio.c on 32 bit kernels 467 cdate Sun Mar 21 14:14:04 MET 2004 468 who martin 469 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 470 file sys/arch/sparc64/conf/files.sparc64 : 1.93 471 descr 472 The sparc compiler miscompiles uvm_bio.c when using 473 any optimization. This results in ubc_release panics. 474 kcah 475 476 port mips 477 478 hack mips-shared-linker-load-address 479 cdate Fri Oct 7 08:33:10 UTC 2005 480 who simonb 481 file src/sys/kern/exec_elf32.c : 1.107 482 descr 483 With COMPAT_16 or previous enabled (which enables 484 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 485 load and run at address 0. The check to fix this in 486 rev 1.107 only checks the first psection of the ELF 487 executable, which may not be loadable. A more correct 488 fix is to check the first loadable psection instead of 489 just the first psection. 490 kcah 491 492 hack mips-duplicate-ras-end-label 493 cdate Sat Sep 2 23:29:42 2006 494 who martin 495 file src/regress/sys/kern/ras/ras3/Makefile : 1.3 496 descr 497 Add -fno-reorder-blocks to CFLAGS to avoid duplicate 498 labels by duplicated __asm output from RAS_END() 499 macro. 500 kcah 501 502 port i386 503 504 hack use volatile intermediate variable to enforce rounding 505 cdate Tue Aug 1 22:15:55 MEST 2006 506 who drochner 507 file src/lib/libm/src/lrintf.c : 1.4 508 file src/lib/libm/src/s_rintf.c : 1.8 509 descr 510 gcc-4 does subsequent operations on "float" values within 511 the i387 FPU without rounding the intermediate results 512 kcah 513
Indexes created Wed Nov 05 19:10:08 GMT 2025