HACKS revision 1.249
1 # $NetBSD: HACKS,v 1.249 2025/04/13 08:19:13 rin 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 llvm needs no-unused-command-line-argument 31 mdate 10 May 2020 32 who maxv 33 file share/mk/bsd.lib.mk 1.380 -> 1.381 34 descr 35 To avoid LLVM warnings when compiling the kernel with special 36 CFLAGS such as KASAN on amd64 or ARMV83_PAC on aarch64, pass 37 -Wno-unused-command-line-argument. 38 kcah 39 40 hack static linking with libpthread 41 mdate 7 May 2019 42 who maya 43 file src/lib/libpthread/Makefile 1.92 -> 1.94 44 descr 45 To avoid some libc thread stub functions being picked up 46 in static builds, link pthread as one section. 47 kcah 48 49 hack disable optimization for gcc-9.3 in src/lib/libc/gdtoa/strtod.c 50 mdate 18 Sep 2020 51 who christos 52 file src/lib/libc/gdtoa/strtod.c 1.15 -> 1.16 53 descr 54 See PR/55668, the program there causes infinite loop 55 kcah 56 57 hack gcc-5.3 optimizes memset+malloc -> calloc inside calloc 58 mdate 4 May 2016 59 who christos 60 file external/gpl2/lib/libmalloc/lib/Makefile 1.3 -> 1.5 61 descr 62 resulting in infinite recursion; we prevent this with 63 -fno-builtin-malloc 64 kcah 65 66 hack turn off tree-vrp for parts of ufs_lookup.c 67 mdate 28 April 2016 68 who mrg christos 69 file src/sys/ufs/ufs/ufs_lookup.c : 1.144 70 pr 51094 71 descr 72 with -ftree-vrp enabled in ufs_lookup.c sometimes bad dir 73 panicks are see. 74 hcah 75 76 hack netstat ieee1394 address printing. 77 mdate 14 Nov 2000 78 who matt 79 file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 80 descr 81 Because the current implementation of IP over IEEE1394, the 82 fw device address contains more than just the IEEE1394 EUI-64. 83 So when printing out IEEE1394 addresses, ignore the extra stuff. 84 kcah 85 86 hack xterm vs. libterm 87 mdate 01 Aug 2000 88 who jdc 89 file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 90 pr 10383 91 descr 92 In order to extend the termcap string over 1023 bytes, a ZZ entry was 93 introduced to point to a memory location containing the full entry. 94 Without this hack, xterm will export a termcap containing the ZZ 95 entry, which will then be ignored by libterm. As xterm modifies the 96 exported termcap, this would cause those modifications to be ignored. 97 kcah 98 99 hack wi-at-big-endian-bus 100 cdate 15 Mar 2002 101 who martin 102 file dev/ic/wireg.h : 1.20 103 descr Add an option to access the underlying bus in big endian byte order 104 to work around deficiencies in bus_space_{read,write}_* macros. 105 Those don't allow the implementation of a proper pcmcia bus space 106 tag. 107 kcah 108 109 hack specific knowledge of colours in curses code 110 cdate Sun Apr 6 11:05:24 BST 2003 111 who jdc 112 file lib/libcurses/color.c : r1.24 113 descr 114 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 115 Fix is to enhance libtermcap to understand terminfo-style % sequences. 116 See also: 117 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 118 kcah 119 120 hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 121 cdate 21 Aug 2003 122 who he 123 file sys/miscfs/procfs/procfs_linux.c : 1.14 124 descr 125 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 126 literals/constants, but refer to variables of a type which is 127 not "unsigned long", causing compilation of procfs_linux.c to 128 fail with "makes integer from pointer without a cast". This 129 is observed on e.g. the sun3 port. Ideally the "types" for 130 symbols should be consistent across all ports. 131 kcah 132 133 hack gcc4 wrong uninitialized variable 134 mdate 10 May 2006 135 who mrg 136 file bin/ksh/eval.c : 1.6 137 file bin/sh/histedit.c : 1.39 138 file bin/sh/parser.c : 1.60 139 file crypto/dist/heimdal/kdc/524.c : 1.10 140 file crypto/dist/ssh/sftp.c : 1.20 141 file crypto/dist/ssh/ssh-keysign.c : 1.11 142 file dist/ipf/lib/hostname.c : 1.2 143 file dist/ipf/tools/ipmon.c : 1.8 144 file dist/ntp/ntpd/ntp_request.c : 1.4 145 file dist/ntp/ntpd/refclock_shm.c : 1.4 146 file dist/ntp/sntp/timing.c : 1.3 147 file dist/pppd/pppstats/pppstats.c : 1.3 148 file dist/tcpdump/print-zephyr.c : 1.5 149 file distrib/utils/sysinst/aout2elf.c : 1.12 150 file gnu/libexec/uucp/uucico/uucico.c : 1.6 151 file lib/libc/citrus/citrus_csmapper.c : 1.6 152 file lib/libc/citrus/citrus_pivot_factory.c : 1.5 153 file lib/libc/inet/inet_cidr_ntop.c : 1.3 154 file lib/libc/inet/inet_ntop.c : 1.3 155 file lib/libc/stdio/vfwprintf.c : 1.8 156 file libexec/ld.elf_so/arch/m68k/mdreloc.c : 1.20 157 file libexec/ld.elf_so/arch/powerpc/ppc_reloc.c : 1.40 158 file libexec/ld.elf_so/arch/sh3/mdreloc.c : 1.22 159 file libexec/ld.elf_so/arch/sparc/mdreloc.c : 1.39 160 file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39 161 file libexec/ld.elf_so/arch/vax/mdreloc.c : 1.21 162 file libexec/ld.elf_so/arch/x86_64/mdreloc.c : 1.27 163 file sbin/fsck_ext2fs/dir.c : 1.19 164 file sbin/routed/rtquery/rtquery.c : 1.18 165 file sys/arch/amd64/amd64/pmap.c : 1.26 166 file sys/arch/i386/pci/piixpcib.c : 1.4 167 file sys/arch/m68k/m68k/pmap_motorola.c : 1.4 168 file sys/crypto/cast128/cast128.c : 1.9 169 file sys/ddb/db_command.c : 1.86 170 file sys/dev/cardbus/cardbus_map.c : 1.21 171 file sys/dev/fss.c : 1.25 172 file sys/dev/ic/igsfb.c : 1.39 173 file sys/dev/ic/mb86950.c : 1.5 174 file sys/dev/ic/midway.c : 1.71 175 file sys/dev/kttcp.c : 1.18 176 file sys/dev/rasops/rasops_bitops.h : 1.9 177 file sys/dev/pci/cmpci.c : 1.31 178 file sys/dev/pci/machfb.c : 1.45 179 file sys/dev/usb/ohci.c : 1.174 180 file sys/dev/usb/uhci.c : 1.196 181 file sys/dev/rasops/rasops_bitops.h : 1.9 182 file sys/dist/ipf/netinet/ip_nat.c : 1.10 183 file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8 184 file sys/dist/pf/net/pf.c : 1.22 185 file sys/fs/udf/udf_vnops.c : 1.4 186 file sys/kern/kern_sig.c : 1.219 187 file sys/kern/tty.c : 1.181 188 file sys/net/bpf.c : 1.116 189 file sys/net/zlib.c : 1.26 190 file sys/netccitt/if_x25subr.c : 1.37 191 file sys/netinet/in.c : 1.107 192 file sys/nfs/nfs_serv.c : 1.108 193 file sys/nfs/nfs_socket.c : 1.129 194 file sys/nfs/nfs_syscalls.c : 1.91 195 file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)] 196 file usr.bin/ftp/ftp.c : 1.140 197 file usr.bin/find/function.c : 1.54 198 file usr.bin/mail/tty.c : 1.20 199 file usr.bin/msgc/msg_sys.def : 1.33-1.34 200 file usr.bin/nl/nl.c : 1.7 201 file usr.bin/systat/keyboard.c : 1.23 202 file usr.bin/usbhidctl/usbhid.c : 1.29 203 file usr.bin/vi/cl/cl_read.c : 1.5 204 file usr.bin/vi/ex/ex_cscope.c : 1.12 205 file usr.bin/vi/ex/ex_tag.c : 1.19 206 file usr.bin/vi/vi/v_txt.c : 1.15 207 file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4 208 file usr.sbin/cron/do_command.c : 1.19 209 file usr.sbin/timed/timed/slave.c : 1.15 210 descr 211 GCC 4.1 gets many uninitialised variable warnings wrong. We should 212 really audit all the old hacks like this when older compilers are 213 removed from the tree, as many are probably no longer required. 214 The problem is that it does not recognize initialization via function 215 call pointer. I.e. 216 int p; 217 foo(&p); 218 does not mark p as initialized. 219 kcah 220 221 hack gcc4 pointer sign and strict aliasing problems 222 mdate 10 May 2006 223 who mrg 224 file bin/ed/Makefile : 1.33 225 file distrib/utils/sysinst/Makefile.inc : 1.44 226 file distrib/utils/x_dhclient/Makefile : 1.15 227 file games/bcd/Makefile : 1.5 228 file games/dab/Makefile : 1.5 229 file games/larn/Makefile : 1.17 230 file games/pom/Makefile : 1.5 231 file lib/libasn1/Makefile : 1.26 232 file lib/libcrypt/Makefile : 1.17 233 file lib/libgssapi/Makefile : 1.16 234 file lib/libhdb/Makefile : 1.20 235 file lib/libkadm5clnt/Makefile : 1.21 236 file lib/libkadm5srv/Makefile : 1.25 237 file lib/libkrb5/Makefile : 1.35 238 file lib/libssh/Makefile : 1.6 239 file lib/libtelnet/Makefile : 1.26 240 file libexec/getty/Makefile : 1.14 241 file libexec/kadmind/Makefile : 1.19 242 file libexec/kpasswdd/Makefile : 1.14 243 file sbin/atactl/Makefile : 1.3 244 file sbin/cgdconfig/Makefile : 1.7 245 file sbin/clri/Makefile : 1.13 246 file sbin/dkctl/Makefile : 1.4 247 file sbin/dump/Makefile : 1.33 248 file sbin/fdisk/Makefile : 1.35 249 file sbin/fsck_ext2fs/Makefile : 1.11 250 file sbin/fsck_ffs/Makefile : 1.29 251 file sbin/fsdb/Makefile : 1.18 252 file sbin/newfs/Makefile : 1.30 253 file sbin/newfs_sysvbfs/Makefile : 1.2 254 file sbin/restore/Makefile : 1.23 255 file sbin/veriexecctl/Makefile : 1.11 256 file sys/lib/libsa/Makefile : 1.59 257 file sys/arch/evbarm/adi_brh/brh_machdep.c : 1.24 258 file usr.bin/awk/Makefile : 1.9 259 file usr.bin/crontab/Makefile : 1.24 260 file usr.bin/ctags/Makefile : 1.8 261 file usr.bin/gzip/Makefile : 1.10 262 file usr.bin/ssh/sftp/Makefile : 1.10 263 file usr.bin/ssh/ssh/Makefile : 1.25 264 file usr.bin/vi/build/Makefile : 1.26 265 file usr.bin/telnet/Makefile : 1.40 266 file usr.bin/tn3270/tn3270/Makefile : 1.36 267 file usr.bin/tr/Makefile : 1.4 268 file usr.sbin/amd/amd/Makefile : 1.27 269 file usr.sbin/amd/amq/Makefile : 1.14 270 file usr.sbin/amd/libamu/Makefile : 1.20 271 file usr.sbin/amd/pawd/Makefile : 1.5 272 file usr.sbin/bind/Makefile.inc : 1.22 273 file usr.sbin/bind/libdns/Makefile : 1.3 274 file usr.sbin/bind/named/Makefile : 1.17 275 file usr.sbin/bootp/bootptest/Makefile : 1.2 276 file usr.sbin/chrtbl/Makefile : 1.6 277 file usr.sbin/cron/Makefile : 1.12 278 file usr.sbin/dhcp/Makefile.inc : 1.20 279 file usr.sbin/hprop/Makefile : 1.13 280 file usr.sbin/installboot/Makefile : 1.35 281 file usr.sbin/ipf/ipftest/Makefile : 1.32 282 file usr.sbin/isdn/isdnd/Makefile : 1.6 283 file usr.sbin/isdn/isdnmonitor/Makefile : 1.3 284 file usr.sbin/isdn/isdntel/Makefile : 1.2 285 file usr.sbin/isdn/isdntrace/Makefile : 126 286 file usr.sbin/mopd/common/Makefile : 1.10 287 file usr.sbin/mopd/mopd/Makefile : 1.9 288 file usr.sbin/mopd/mopprobe/Makefile : 1.7 289 file usr.sbin/makefs/Makefile : 1.17 290 file usr.sbin/mscdlabel/Makefile : 1.5 291 file usr.sbin/pkg_install/add/Makefile : 1.7 292 file usr.sbin/pkg_install/create/Makefile : 1.5 293 file usr.sbin/pkg_install/lib/Makefile : 1.28 294 file usr.sbin/ntp/ntpd/Makefile : 1.10/1.11 295 file usr.sbin/ntp/ntptime/Makefile : 1.4/1.5 296 file usr.sbin/pppd/Makefile.inc : 1.3 297 file usr.sbin/pppd/pppd/Makefile : 1.38 298 file usr.sbin/rarpd/Makefile : 1.10 299 file usr.sbin/rbootd/Makefile : 1.10 300 file usr.sbin/rpc.pcnfsd/Makefile : 1.17 301 file usr.sbin/tcpdump/Makefile : 1.42 302 descr 303 GCC 4.1 warns on pointer sign comparison/assignments and lots of 304 code does not conform. For now we use -Wno-pointer-sign and 305 -fno-strict-aliasing. 306 kcah 307 308 hack disable ctf for gcc-4.8 build 309 mdate April 3 2014 310 who christos 311 file external/gpl3/gcc/usr.bin/Makefile.frontend : 1.4 312 file external/gpl3/gcc/usr.bin/Makefile.backend : 1.5 313 descr 314 nbctfconvert -g -L VERSION -g fold-const.o 315 ERROR: fold-const.c: failed to get mapping for tid 79154 \ 316 ((null)) <13532> 317 kcak 318 319 hack emacs aborting on exit (libgcc issue) 320 mdate 7 November 2011 321 who christos 322 file external/gpl3/gcc/dist/gcc/unwind-dw2-fde.c : 1.2 323 descr 324 GCC 4.5.3 now calls __unregister_frame_info_bases() on unloading/exit 325 to do just that. If the symbol requested is not found, then it aborts. 326 emacs 23.3 triggers this assertion. For now disable aborting, and 327 silently ignore. 328 kcah 329 330 hack cross-building hack on Darwin 331 mdate 20 July 2008 332 who agc 333 file src/distrib/common/Makefile.mdset : 1.33 334 descr 335 Darwin has problems with getopt() when used in mdsetimage -v, 336 due to the difference between BSD and libiberty() getopt 337 implementations, more fully described in 338 http://mail-index.netbsd.org/current-users/2008/06/27/msg003242.html 339 and the subsequent thread. For just now, we just have an ugly 340 workaround not to call mdsetimage with the -v argument on Darwin 341 kcah 342 343 hack avoid rebuilding asn1 libraries 344 mdate 03 August 2008 345 who veego 346 file src/crypto/dist/heimdal/lib/asn1/gen.c : 1.10 347 file src/lib/libasn1/Makefile : 1.32 348 file src/lib/libhdb/Makefile : 1.23 349 file src/lib/libgssapi/Makefile : 1.20 350 file src/lib/libhx509/Makefile : 1.3 351 pr 9702 39185 352 descr 353 asn1_compile does not check if generated header files do not have to 354 be rebuild. 355 Generate .hx files and copy it in the Makefiles if they changed. 356 kcah 357 358 hack Disable fortification for /usr/bin/makeinfo 359 cdata 24 Mar 2014 360 who tron 361 file src/external/gpl2/texinfo/bin/makeinfo/Makefile : 1.1 362 pr N/A 363 descr 364 If "makeinfo" is compiled with "-D_FORTIFY_SOURCE=2" using GCC 4.8.3 365 it fails to process certain texinfo files, e.g. "cl.texi" 366 included in the Emacs 24.3 distribution. 367 kcah 368 369 hack Disable Stack Smash Protection for /usr/X11R7/bin/xauth 370 cdata 05 Apr 2014 371 who tron 372 file src/external/mit/xorg/bin/xauth/Makefile : 1.4 373 pr N/A 374 descr 375 If "xauth" is compile with "USE_SSP" set to "yes" it fails 376 mysteriously with an error message like this: 377 378 /usr/X11R7/bin/xauth: file /foo/bar/.Xauthority does not exist 379 /usr/X11R7/bin/xauth: unable to link authority file /foo/bar/.Xauthority, use /foo/bar/.Xauthority 380 381 The compiler seems to get confused about the two filename variables 382 used in the link(2) system call. 383 kcah 384 385 hack g++ 5.x barfs on volatile in constexpr initializers 386 cdata 27 Aug 2015 387 who pooka 388 file src/lib/libpthread/pthread_types.h : 1.17 389 pr lib/49989 390 descr 391 Trying to use e.g. pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER 392 in C++ results in: 393 error: temporary of non-literal type '__pthread_mutex_st' 394 in a constant expression 395 constexpr mutex() _NOEXCEPT : __m_(PTHREAD_MUTEX_INITIALIZER) {} 396 [...] 397 include/pthread_types.h:101:8: note: '__pthread_mutex_st' is 398 not literal because: 399 struct __pthread_mutex_st { 400 ^ 401 include/pthread_types.h:103:17: note: non-static data 402 member '__pthread_mutex_st::ptm_errorcheck' has volatile type 403 pthread_spin_t ptm_errorcheck; 404 kcah 405 406 hack libm cabs{,f,l} and g++ 407 cdata 11 Jan 2016 408 who christos 409 pr lib/50646 410 file src/external/gpl3/gcc.old/dist/libstdc++-v3/include/std/complex : 1.2 411 file src/external/gpl3/gcc/dist/libstdc++-v3/include/std/complex : 1.2 412 descr 413 Our cabs and cabsf have a different argument format on some architectures 414 and for that we have created in libm/compat_cabs{,f}.c. The standard 415 versions in libc are __c99_cabs{,f,l} and there are __RENAME()'s in 416 <complex.h>. G++ uses __builtin_cabs{,f,l} to implement those and they 417 translate by default to cabs{,f,l} which gets defined to cabs{,f} (the 418 wrong function) and an undefined cabsl. I've changed <complex> to use 419 the __c99_cabs{,f,l} directly. Using the __builtin_cabs{,f,l} in gcc is 420 still broken. 421 kcah 422 423 hack xorg warnings 424 cdate 30 July 2008, 3 June, 2013 425 who mrg 426 file external/mit/xorg/lib/libSM/Makefile : 1.2 427 external/mit/xorg/lib/libX11/Makefile.libx11 : 1.10 428 external/mit/xorg/lib/libXext/Makefile : 1.2 429 external/mit/xorg/lib/libXfont/Makefile : 1.2 430 descr 431 Disable several warnings or use -Wno-error across Xorg sources 432 while we get them working 433 kcah 434 435 hack 32 bit time leftovers 436 cdate 11 January 2009 437 who christos 438 file lib/libc/time/localtime.c : 1.41 439 lib/libc/time/zic.c : 1.23 440 descr 441 The timezone compiled files still contain 32 bit time_t 442 quantities. I did not want to version the files because 443 the ``parser'' is too ugly for words. What needs to be 444 done, is to rewrite the parser from scratch also to avoid 445 potential core-dumps from parsing invalid files. 446 kcah 447 448 hack 32 bit time leftovers 449 cdate 11 January 2009 450 who christos 451 file various 452 descr 453 Many filesystem on-disk formats have 32 bit times. 454 kcah 455 456 457 port vax 458 459 hack gcc10/vax ICE 460 cdate Sun Jan 22 15:37:56 EST 2023 461 who christos 462 file external/mit/xorg/lib/fontconfig/src/Makefile : 1.28 463 descr 464 Disable optimization on some files 465 kcah 466 467 hack declare boolean_t in two IPF user-mode programs 468 cdate Tue Mar 7 19:19:20 CET 2006 469 who he 470 file dist/ipf/ipsend/iptests.c : 1.8 471 dist/ipf/ipsend/sock.c : 1.7 472 descr 473 The IPF user-mode programs ipsend and iptest first 474 include <sys/types.h> without _KERNEL defined, and 475 later include <sys/file.h> with _KERNEL defined. 476 This causes a build failure when building for vax, 477 since <sys/device.h> ends up being included without 478 bollean_t being defined by <sys/types.h>. 479 Build failure and further details documented in 480 PR#32907. 481 kcah 482 483 hack pcc 0.9.9 large string literals 484 cdat 8 July 2008 485 who gmcgarry 486 file sys/conf/param.c : 1.58 487 descr 488 Workaround for pcc 0.9.9 not handling large string literals 489 which causes kernels with 'options INCLUDE_CONFIG_FILE' to 490 fail compilation. 491 There is a proposal on the pcc mailing list to stuff config 492 file in ELF section. 493 kcah 494 495 port arm 496 497 hack gcc-unsigned-compare 498 cdate 09 Mar 2002 499 mdate 18 Mar 2002 500 who bjh21 501 file dist/bind/lib/nameser/ns_parse.c : 1.3 502 file dist/dhcp/minires/ns_parse.c : 1.3 503 file dist/dhcp/omapip/result.c : 1.2 504 file dist/dhcp/server/failover.c : 1.3 505 file gnu/dist/toolchain/bfd/bfd.c : 1.2 506 file gnu/dist/toolchain/bfd/format.c : 1.2 507 file gnu/dist/toolchain/gdb/target.c : 1.2 508 file sys/kern/vfs_subr.c : 1.172 509 descr When checking that a potentially-unsigned enum is >= 0, assign 510 it to an int first. This is necessary to avoid "comparison is 511 always true" warnings with -fshort-enums. Casting to an int 512 really should be enough, but turns out not to be. 513 kcah 514 515 hack gcc-4.5 arm CNAME hostname lookup failure on 516 certain DNS environment (probably -ftree-ter problem) 517 cdate Sat Dec 24 04:59:00 UTC 2011 518 mdate 519 who tsutsui 520 file lib/libc/net/Makefile.inc 1.79 521 descr Hostname lookup against CNAMEs by some commands fails 522 on certain DNS environments if lib/libc/net/gethnamaddr.c 523 (ping(8) etc) and lib/libc/net/getaddrinfo.c (ftp(1) etc) 524 are compiled with -O2, even though nslookup(1) against 525 the same CNAME returns proper hostname. 526 They works properly if compiled with -O2 -fno-tree-ter. 527 Also -O2 fails but -O2 -fno-tree-ter works on the following 528 test case in gcc bugzilla: 529 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48863#c4 530 kcah 531 532 port sh3 533 534 hack gcc4-sh3-bz2 535 cdate Sun May 21 03:34:57 UTC 2006 536 mdate Fri May 16 13:13:00 UTC 2008 537 who mrg, tsutsui 538 file lib/libbz2/Makefile : 1.10 539 descr 540 The in-tree GCC 4.1-based compiler generated too-far 541 pc-relative addresses. Hack is to build with 542 -fno-loop-optimize. 543 kcah 544 545 port m68000 546 547 hack gcc4-m68000 548 cdate Fri Feb 8 10:29:37 PST 2008 549 mdate Sun May 4 15:37:19 UTC 2008 550 who mrg, tsutsui 551 file rescue/Makefile : 1.21 552 file sbin/dump_lfs/Makefile : 1.9 553 file sbin/fsck_ffs/Makefile : 1.35 554 file sbin/fsdb/Makefile : 1.22 555 file share/mk/sys.mk : 1.96 556 file usr.sbin/ndbootd/Makefile : 1.5 557 descr 558 Several internal compiler errors with gcc -O1 559 around 64bit integer arithmetic. 560 This hack uses -O1 and adds some -fno-tree-foo options 561 to avoid the problem. 562 This might be related with GCC Bugzilla Bug 32424. 563 kcah 564 565 port m68k,sh3,vax 566 567 hack gcc-4.8.1 568 cdate Wed Nov 6 20:41:35 EST 2013 569 mdate 2014/05/16 09:36:51 570 who christos 571 file src/external/gpl3/gcc/lib/libstdc++-v3/Makefile : 1.11 572 descr 573 compile the followings with -fimplicit-templates to 574 produce missing instantiation of std::lower_bound expansion 575 for unsigned long: 576 - concept-inst.cc 577 - hashtable_c++0x.cc 578 - bitmap_allocator.cc 579 kcah 580 581 port sparc 582 583 hack avoid NULL pointer derefs in savefpstate IPIs and GCC 4.5.3 584 cdate Sun Aug 14 19:26:48 PDT 2011 585 who mrg 586 file sys/arch/sparc64/sparc/cpu.c : 1.234 587 file sys/arch/sparc64/sparc/cpuvar.h : 1.90 588 file sys/arch/sparc64/sparc/genassym.cf : 1.67 589 file sys/arch/sparc64/sparc/locore.s : 1.265 590 descr 591 Something is wrong with GCC 4.5.3 and the savefpstate IPI. 592 Post newlock2 there was a bug where a lock was reduced from 593 IPL_SCHED to IPL_VM (?) and occasionally savefpstate IPI 594 would crash due to NULL IPI. This was fixed by re-using the 595 right IPL value. However, GCC 4.5.3 build kernels have the 596 same problems. For now, the hack is re-instated. 597 kcah 598 599 600 port mips 601 602 hack mips-shared-linker-load-address 603 cdate Fri Oct 7 08:33:10 UTC 2005 604 who simonb 605 file src/sys/kern/exec_elf32.c : 1.107 606 descr 607 With COMPAT_16 or previous enabled (which enables 608 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 609 load and run at address 0. The check to fix this in 610 rev 1.107 only checks the first psection of the ELF 611 executable, which may not be loadable. A more correct 612 fix is to check the first loadable psection instead of 613 just the first psection. 614 kcah 615 616 hack mips-duplicate-ras-end-label 617 cdate Sat Sep 2 23:29:42 2006 618 who martin 619 file src/regress/sys/kern/ras/ras3/Makefile : 1.3 620 descr 621 Add -fno-reorder-blocks to CFLAGS to avoid duplicate 622 labels by duplicated __asm output from RAS_END() 623 macro. 624 kcah 625 626 hack mips-mcount-assembler-warning 627 cdate Tue Jul 29 14:16:52 UTC 2008 628 who lukem 629 file src/lib/libc/gmon/Makefile.inc : 1.8 630 descr 631 Workaround for PR port-mips/39192. 632 common/lib/libc/gmon/mcount.c generates a (fatal) 633 assembler warning on MIPS: 634 Warning: No .cprestore pseudo-op used in PIC code 635 Add COPTS.count.c+=-Wa,--no-warn to avoid -Wa,--fatal-warnings 636 kcah 637 638 hack mips-use-binutils-old 639 cdate Sun May 7 14:28:55 CEST 2023 640 who martin 641 file src/share/mk/bsd.own.mk : 1.1311, 1.1308 642 descr 643 Use binutils.old for 64bit mips with 32bit userland. 644 Version 2.39 causes random (cross-) build failures 645 that are hard to reproduce or analyze. 646 kcah 647 648 port i386 649 650 hack use volatile intermediate variable to enforce rounding 651 cdate Tue Aug 1 22:15:55 MEST 2006 652 who drochner 653 file src/lib/libm/src/lrintf.c : 1.4 654 file src/lib/libm/src/s_rintf.c : 1.8 655 descr 656 gcc-4 does subsequent operations on "float" values within 657 the i387 FPU without rounding the intermediate results 658 kcah 659 660 port x86 661 hack turn off optimization for biosdisk_ll.c because otherwise 662 we are pass the wrong arguments to biosdisk_read(). 663 $ cd /usr/src/sys/arch/i386/floppies/bootflopp-com 664 $ qemu-system-i386 -nographic -fda boot-com1.fs -boot a 665 cdate Mon Apr 7 21:09:55 2014 UTC 666 who christos 667 file src/sys/arch/i386/stand/lib/Makefile : 1.38 668 descr 669 Turning on DISK_DEBUG shows the problem. We should find 670 out which option is causing this. 671 hcah 672 673 port powerpc 674 675 hack avoid using __builtin_return_address(0) because it fails in 676 Xorg's module loader 677 cdate Sat Sep 27 03:52:05 UTC 2008 678 who macallan 679 file src/libexec/ld.elf_so/rtld.c : 1.121 680 descr 681 workaround for PR port-macppc/37812 682 kcah 683 684 hack define TARGET_SECURE_PLT and HAVE_AS_TLS because when 685 building the native compiler via build.sh those don't defined 686 properly. 687 cdate Sat Mar 12 08:00:00 UTC 2011 688 who matt 689 file src/gnu/dist/gcc4/gcc/config/rs6000/netbsd.h : 1.7 690 descr 691 see above 692 kcah 693 694 port powerpc64 695 696 hack include _errno.c in libposix so that __errno resolves. It 697 should resolve from libc's errno, but somehow it does not. 698 Linker bug? 699 cdate Thu Oct 27 13:19:47 EDT 2011 700 who christos 701 file src/lib/libposix/Makefile: 1.15 702 file src/lib/librt/Makefile: 1.14 703 descr 704 workaround for: 705 libposix_pic.a(cerror.pico)(.text+0x14): unresolvable \ 706 R_PPC64_REL24 relocation against symbol `.__errno' 707 kcah 708 709 hack rename data() function in mdocml to avoid redefined error. 710 Compiler/Assembler bug? 711 cdate Sat Oct 29 11:16:01 EDT 2011 712 who christos 713 file src/external/bsd/mdocml/tbl_data.c: 1.2 714 descr 715 workaround for: 716 {standard input}: Assembler messages: 717 {standard input}:105: Error: symbol `.data' is already \ 718 defined 719 kcah 720 721 port emips 722 723 hack Add nop between ctc1 and mtc0 to avoid assembler internal 724 error 725 cdate Sat Oct 29 16:57:34 EDT 2011 726 who christos 727 file src/sys/arch/mips/mips/mips_fpu.c: 1.7 728 descr 729 workaround for: 730 {standard input}: Assembler messages: 731 {standard input}:730: Internal error! 732 Assertion failure in append_insn at /usr/src/external/gpl3/\ 733 binutils/dist/gas/config/tc-mips.c line 2910. 734 kcah 735 736 port ia64 737 738 hack libgcc unwind dummy function 739 cdate Fri Apr 17 14:31:03 CEST 2015 740 who martin 741 file src/external/gpl3/gcc/dist/libgcc/config/ia64/unwind-ia64.c: 1.4 742 descr 743 Add an empty _Unwind_FindTableEntry() implementation. 744 In the end we will use our libc stuff, and this should 745 go away again. 746 kcah 747 748 port x68k 749 750 hack compiler error with gcc 4.5.x 751 cdate Fri May 24 13:23:01 EDT 2013 752 who christos 753 file src/external/gpl3/gcc/usr.bin/bakend/Makefile: 1.17 754 xsrc/external/mit/xorg/lib/libGLU/Makefile: 1.11 755 descr 756 workaround for: 757 internal compiler error: in cselib_record_set, at cselib.c:1999 758 kcah 759 760 hack fallback to /usr/bin/clang-cpp in rpcgen 761 cdate Wed Jun 5 15:49:27 CEST 2013 762 who joerg 763 file src/usr.bin/rpcgen/rpc_main.c : 1.35 764 descr 765 It is undecided which compiler owns /usr/bin/cpp and whether it should 766 exist in a MKGCC=no world. To allow rpcgen to work out-of-the-box, 767 if either gcc or clang is installed, use /usr/bin/clang-cpp as fallback. 768 This applies only if RPCGEN_CPP is not set and /usr/bin/cpp is not executable. 769 kcah 770 771 port hppa 772 773 hack compiler error with gcc 4.5.x 774 cdate Tue Jul 23 07:42:28 BST 2013 775 who skrll 776 file src/sys/lib/libkern/Makefile.libkern: 1.26 777 descr 778 workaround for unanalysed codegen bug affecting md5c.c. 779 kcah 780 781 hack gdb vs _rtld_debug_state problem 782 cdate Thu Mar 5 09:49:53 UTC 2015 783 who skrll 784 file src/libexec/ld.elf_so/rtld.c: 1.175 785 descr 786 workaround for problem where gdb misses the breakpoint on 787 _rtld_debug_state when the function is only the 788 bv,n %r0(%rp) instruction - the nullify seems to 789 confuse something 790 kcah 791 792 port mips64* 793 hack compiler crashes on mips64* with optimization enabled 794 cdate Tue May 13 18:46:48 UTC 2014 795 who macallan 796 file src/external/lgpl3/gmp/lib/libgmp/arch/mips64eb/Makefile.inc: 1.6 797 src/external/lgpl3/gmp/lib/libgmp/arch/mips64eb/config.h: 1.5 798 src/external/lgpl3/gmp/lib/libgmp/arch/mips64el/Makefile.inc: 1.6 799 src/external/lgpl3/gmp/lib/libgmp/arch/mips64el/config.h: 1.5 800 descr workaround for n32 gcc doing unaligned 64bit accesses when optimizing 801 pr 48696 802 kcah 803 804 port vax 805 hack compile nir.c in gallium with -O1 806 cdate Mon Oct 28 14:39:35 EDT 2019 807 who christos 808 file /cvsroot/src/external/mit/xorg/lib/gallium/Makefile 1.36 809 descr gallium does not compile. 810 kcah 811 812 port sh3 813 hack compile parse.c in battlestar with -Wno-restrict 814 cdate Mon Oct 28 14:39:35 EDT 2019 815 who christos 816 file /cvsroot/src/games/battlestar/Makefile 1.11 817 descr fails to compile, confused by char words[][]; 818 strcpy(words[n - 1], words[n + 1]); 819 kcah 820 821 port sh3 822 hack compile ddns.c in dhcpcd with no-stringop-overflow 823 cdate Tue Oct 29 20:25:59 EDT 2019 824 who christos 825 file /cvsroot/src/external/mpl/dhcp/bin/server/Makefile 1.2 826 descr fails to compile, confused by builtin_object_size in strcat(p, ".in..") 827 kcah 828 829 port arm 830 hack avoid using labels in a 12-bit constant. 831 cdate Mon Mar 30 05:26:47 2015 UTC 832 who matt 833 file crypto/external/bsd/openssl/lib/libcrypto/arch/arm/aes-armv4.S: 1.2 834 descr workaround for clang misassembling an instruction 835 kcah 836 837 port sparc64 838 hack during profiling with -m32 (and ASLR) labels are not generated 839 consistently 840 cdate Sat Feb 11 04:56:37 2017 UTC 841 who christos 842 file /cvsroot/src/crypto/external/bsd/heimdal/lib/libasn1/Makefile: 1.4 843 desc asn1_krb5_asn1.po does not produce the same results during successive 844 compilation runs; it is bimodal. Turning optimization to -O0 fixes 845 the issue 846 kcah 847 848 port ia64 849 hack ski emulator crashes 850 cdate Sat Apr 8 18:10:43 2017 UTC 851 who scole 852 file /cvsroot/src/sys/external/bsd/acpica/dist/tables/tbxfload.c: 1.6 853 desc 854 ski emulator crashes during acpi detection. Added a check for 855 uninitialized index. Submitted a request for change with upstream 856 mailing list, but never got a response 857 kcah 858 859 port powerpc 860 hack compile tc.c, logerr.c, ubsan.c with -O0 for clang 861 cdate Wed Jan 29 17:40:19 EST 2020 862 who christos 863 file src/external/bsd/atf/lib/libatf-c/Makefile: 1.22 864 file src/external/bsd/dhcpcd/sbin/dhcpcd/Makefile: 1.49 865 file src/tests/lib/libc/misc/Makefile: 1.5 866 867 descr Disable optimization on tc.c, logerr.c, ubsan.c crashes: 868 lib/libLLVMCodeGen/../../llvm/../../external/apache2/llvm/lib/..\ 869 /dist/llvm/include/llvm/CodeGen/MachineFrameInfo.h", line 495, \ 870 function "__int64_t llvm::MachineFrameInfo::getObjectOffset(int) const" 871 kcah 872 873 port m68k 874 hack compile aes_ccm_tag() with -O0 875 cdate Mon Aug 10 06:27:29 UTC 2020 876 mdate Wed Aug 10 00:00:00 UTC 2022 877 who rin 878 file src/sys/crypto/aes/aes_ccm.c: 1.5 879 descr GCC 9.4 and 8.3 miscompile aes_ccm_tag() for m68k with optimization 880 level -O[12], which results in failure in aes_ccm_selftest(). 881 For 9.4, -O0 and -O1 work but -O2 fails for amiga (A1200, 68060) and 882 mac68k (Quadra 840AV, 68040). Whereas -O0 and -O2 work but -O1 fails 883 for sun3 (TME, 68020 emulator) and sun2 (TME, 68010 emulator). 884 aes_ccm_selftest() still fails with GCC 10.4 and -O2. 885 kcah 886 887 port sh3 888 889 hack gcc9-sh3-lint 890 cdate Tue Jun 22 14:59:52 CEST 2021 891 mdate Mon Jul 5 12:34:57 CEST 2021 892 who hgutch 893 file external/gpl3/gcc/dist/gcc/config/sh/sh.md 1.2 894 external/gpl3/gcc.old/dist/gcc/config/sh/sh.md 1.11 895 descr 896 The in-tree gcc 9/gcc 10 crashes with an internal 897 invalid opcode exception when using any kind of 898 optimization on lex.c in usr.bin/xlint/lint . This 899 was introduced apparently unintendedly in gcc when 900 addressing a different issue. Rather than disabling 901 optimization for lex.c, instead revert the change to 902 gcc. The bug report upstream has been updated to 903 reflect the exact breakage. 904 905 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101177 906 kcah 907 908 port arm 909 hack compile t_sig_backtrace with -fno-omit-frame-pointer for arm 910 cdate Tue Nov 23 23:24:37 UTC 2021 911 mdate Tue Nov 23 23:24:37 UTC 2021 912 who thorpej 913 file src/tests/lib/libexecinfo/Makefile: 1.8 914 file src/tests/lib/libexecinfo/t_sig_backtrace: 1.2 915 descr Unit test fails to pass unless t_sig_backtrace.c is compiled 916 with -fno-omit-frame-pointer and -DNOINLINE_HACK. 917 kcah 918 919 hack alpha gcc error in lint 920 cdate 2022/04/10 13:21:34 921 who martin 922 port alpha, vax 923 file usr.bin/xlint/Makefile.inc: 1.23, 1.25 924 pr 56789 925 descr 926 Compiling lint with -ftrapv fails with an internal 927 gcc compiler error. 928 929 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105209 930 931 Supposedly fixed in gcc 11 or newer. 932 kcah 933 934 hack compile copy{in,out}() for ibm4xx with -O0 for clang 935 cdate Mon Sep 12 08:06:36 UTC 2022 936 who rin 937 port evbppc 938 file sys/arch/powerpc/ibm4xx/trap.c: 1.99 939 descr 940 clang 13.0.0 miscompiles copy{in,out}() with -O[12]. As a result, 941 kernel cannot execute /sbin/init. 942 kcah 943 944 hack Disable secure PLT for alpha 945 cdate Fri Jul 7 08:33:25 UTC 2023 946 who rin 947 port alpha 948 file src/external/gpl3/binutils/dist/bfd/elf64-alpha.c: 1.11 949 pr port-alpha/57511 950 descr 951 Temporally disable secure PLT support, introduced by 952 binutils 2.39 for us. We need its support to ld.elf_so(1). 953 kcah 954 955 hack openssl: Disable ec_nistp_64_gcc_128 on aarch64eb 956 cdate Sat Jul 8 23:54:27 UTC 2023 957 who rin 958 port aarch64eb 959 file src/crypto/external/bsd/openssl/lib/libcrypto/arch/aarch64/ec.inc : 1.4 960 descr 961 As described in upstream document: 962 https://github.com/openssl/openssl/blob/master/INSTALL.md#enable-ec_nistp_64_gcc_128 963 This feature (for LP64) does not support big-endian machines. 964 Note that sparc64 does not use this (port-sparc64/57472). 965 kcah 966 967 hack GCC: Disable "-Warray-bounds" for x86 curcpu() and curlwp() 968 cdate Mon Sep 4 13:59:32 PDT 2023 969 who mrg 970 port i386 amd64 971 file src/sys/arch/amd64/include/cpu.h : 1.71 972 file src/sys/arch/i386/include/cpu.h : 1.184 973 descr 974 These functions trigger eg: 975 ./machine/cpu.h:57:9: error: array subscript 0 is outside array bounds of 'struct cpu_info * const[0]' [-Werror=array-bounds] 976 56 | __asm("movq %%gs:%1, %0" : 977 and can't easily be worked around. 978 kcah 979 980 hack ctfconvert/gcc: disable gcc dwarf-4 generation 981 cdate Thu Apr 4 19:51:05 EDT 2024 982 who christos 983 file src/external/mit/xorg/lib/gallium.old/Makefile : 1.9 984 descr 985 Some files create dwarf info that our ctfmerge can't handle. 986 We downgrade dwarf generation to version 3 which works. 987 kcah 988 989 hack ia64: work around feclearexcept/fetestexcept compiler bug 990 cdate Sun May 5 23:06:10 UTC 2024 991 who riastradh 992 file tests/lib/libm/t_fe_round.c 993 descr 994 Without judiciously placed __insn_barrier, we get: 995 /tmp//ccJayu9g.s:2793: Warning: Use of 'mov.m' violates RAW dependency 'AR[FPSR].sf0.flags' (impliedf) 996 /tmp//ccJayu9g.s:2793: Warning: Only the first path encountering the conflict is reported 997 /tmp//ccJayu9g.s:2757: Warning: This is the location of the conflicting usage 998 kcah 999 1000 hack m68k: work around stack protector m68k compiler bug 1001 cdate Thu Jun 6 15:53:21 PDT 2024 1002 udate Sat Aug 17 15:18:30 UTC 2024 1003 port m68k 1004 who mrg, rin 1005 file lib/libc/stdlib/strsuftoll.c : 1.10 1006 file lib/libc/citrus/citrus_module.c : 1.14 1007 file crypto/external/bsd/openssl/lib/libcrypto/blake2.inc : 1.3 1008 file crypto/external/bsd/openssl/lib/libcrypto/sha.inc : 1.8 1009 file external/mit/xorg/lib/freetype/Makefile : 1.26 1010 file external/mit/xorg/lib/gallium/Makefile : 1.56 1011 descr 1012 With GCC 12, strsuftoll() triggers an stack protector issue 1013 that does not appear to be valid. _citrus_find_getops() does 1014 the same. They both have minimal stack usage themselves and 1015 I suspect a GCC bug. 1016 Other cases are less well studied. 1017 kcah 1018 1019 hack gcc: work around alignment limitations in ld.elf_so 1020 cdate Mon Jun 17 23:35:52 UTC 2024 1021 who riastradh 1022 file external/gpl3/gcc/dist/libsanitizer/tsan/tsan_interceptors_posix.cpp : 1.4 1023 file src/external/gpl3/gcc/dist/libsanitizer/tsan/tsan_rtl.cpp : 1.4 1024 file external/gpl3/gcc/dist/libsanitizer/tsan/tsan_rtl.h : 1.5 1025 descr 1026 ld.elf_so only supports 2*pointer-aligned objects (typically 1027 8- or 16-byte) in thread-local storage, but tsan expects 1028 cacheline-aligned objects (typically >=64-byte). To work 1029 around this, allocate n + 63 bytes and pick whichever pointer 1030 in that interval is aligned (PR lib/58349). 1031 kcah 1032 1033 hack binutils: 68lc040 needs support for fpu emulation on some cpus. 1034 cdate Thu Apr 3 11:52:14 UTC 2025 1035 port m68k 1036 who nat 1037 file external/gpl3/binutils/dist/gas/config/tc-m68k.c : 1.13 1038 descr Early buggy revisions of 68LC040 cpu cannot use fpu emulation without 1039 some binutils supprt. Adding NOP before F-LINE instructions. 1040 (PR port-mac68k/13078 and binutils PATCH request 1041 - https://sourceware.org/pipermail/binutils/2025-March/140270.html) 1042 kcah 1043
Indexes created Sat Nov 14 00:26:57 UTC 2026