HACKS revision 1.109
1# $NetBSD: HACKS,v 1.109 2008/08/03 07:16:58 veego Exp $ 2# 3# This file is intended to document workarounds for currently unsolved 4# (mostly) compiler bugs. 5# 6# Format: 7# hack title 8# cdate creation date 9# mdate mod date 10# who responsible developer 11# port ... 12# affected ports, space separated, if not "all" 13# file affected file : revision : line from : line to 14# affected files and revision and line numbers describing hack 15# multiple lines if necessary. 16# pr NNNN ... 17# problem reports this hack works around, if known. Space 18# separated. 19# regress src/regress/directory/where/test/found 20# regression test directories, if available. 21# descr 22# insert short informal description (multi-line). (Longer ones 23# should be in the PR database. More formal descriptions might 24# be in the regress tree. See above). 25# kcah 26# closing bracket. 27# 28# this is a comment. 29 30hack netstat ieee1394 address printing. 31mdate 14 Nov 2000 32who matt 33file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503 34descr 35 Because the current implementation of IP over IEEE1394, the 36 fw device address contains more than just the IEEE1394 EUI-64. 37 So when printing out IEEE1394 addresses, ignore the extra stuff. 38kcah 39 40hack xterm vs. libterm 41mdate 01 Aug 2000 42who jdc 43file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614 44pr 10383 45descr 46 In order to extend the termcap string over 1023 bytes, a ZZ entry was 47 introduced to point to a memory location containing the full entry. 48 Without this hack, xterm will export a termcap containing the ZZ 49 entry, which will then be ignored by libterm. As xterm modifies the 50 exported termcap, this would cause those modifications to be ignored. 51kcah 52 53hack wi-at-big-endian-bus 54cdate 15 Mar 2002 55who martin 56file dev/ic/wireg.h 57descr Add an option to access the underlying bus in big endian byte order 58 to work around deficiencies in bus_space_{read,write}_* macros. 59 Those don't allow the implementation of a proper pcmcia bus space 60 tag. 61kcah 62 63hack specific knowledge of colours in curses code 64cdate Sun Apr 6 11:05:24 BST 2003 65who jdc 66file lib/libcurses/color.c : r1.24 67descr 68 Swap red/blue and yellow/cyan colours for COLOR_OTHER. 69 Fix is to enhance libtermcap to understand terminfo-style % sequences. 70 See also: 71 http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html 72kcah 73 74hack Compensation for differing types of LINUX_USRSTACK and USRSTACK 75cdate 21 Aug 2003 76who he 77file sys/miscfs/procfs/procfs_linux.c : 1.14 78descr 79 Not all ports have LINUX_USRSTACK and/or USRSTACK defined as 80 literals/constants, but refer to variables of a type which is 81 not "unsigned long", causing compilation of procfs_linux.c to 82 fail with "makes integer from pointer without a cast". This 83 is observed on e.g. the sun3 port. Ideally the "types" for 84 symbols should be consistent across all ports. 85kcah 86 87hack gcc-strict-aliasing 88cdate 6 August 2004 89who junyoung 90pr 26516 91file src/usr.sbin/racoon/racoon/Makefile : 1.21 92descr 93 GCC issues a warning "dereferencing type-punned pointer will break 94 strict-aliasing rules" when compiling 95 crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this 96 is due to use of type casting in a non-standard way in the code and 97 not a compiler bug. Once a new release of KAME with a proper fix 98 applied is imported this should be backed out. 99kcah 100 101hack gcc4 wrong uninitialized variable 102mdate 10 May 2006 103who mrg 104file bin/ksh/eval.c : 1.6 105file bin/sh/histedit.c : 1.39 106file bin/sh/parser.c : 1.60 107file crypto/dist/heimdal/kdc/524.c : 1.10 108file crypto/dist/ssh/sftp.c : 1.20 109file crypto/dist/ssh/ssh-keysign.c : 1.11 110file dist/ipf/lib/hostname.c : 1.2 111file dist/ipf/tools/ipmon.c : 1.8 112file dist/ntp/ntpd/ntp_request.c : 1.4 113file dist/ntp/ntpd/refclock_shm.c : 1.4 114file dist/ntp/sntp/timing.c : 1.3 115file dist/pppd/pppstats/pppstats.c : 1.3 116file dist/smbfs/lib/smb/rap.c : 1.6 117file dist/tcpdump/print-zephyr.c : 1.5 118file distrib/utils/sysinst/aout2elf.c : 1.12 119file gnu/libexec/uucp/uucico/uucico.c : 1.6 120file lib/libc/citrus/citrus_csmapper.c : 1.6 121file lib/libc/citrus/citrus_pivot_factory.c : 1.5 122file lib/libc/inet/inet_cidr_ntop.c : 1.3 123file lib/libc/inet/inet_ntop.c : 1.3 124file lib/libc/stdio/vfwprintf.c : 1.8 125file libexec/ld.elf_so/arch/m68k/mdreloc.c : 1.20 126file libexec/ld.elf_so/arch/powerpc/ppc_reloc.c : 1.40 127file libexec/ld.elf_so/arch/sh3/mdreloc.c : 1.22 128file libexec/ld.elf_so/arch/sparc/mdreloc.c : 1.39 129file libexec/ld.elf_so/arch/sparc64/mdreloc.c : 1.39 130file libexec/ld.elf_so/arch/vax/mdreloc.c : 1.21 131file libexec/ld.elf_so/arch/x86_64/mdreloc.c : 1.27 132file sbin/fsck_ext2fs/dir.c : 1.19 133file sbin/routed/rtquery/rtquery.c : 1.18 134file sys/arch/amd64/amd64/pmap.c : 1.26 135file sys/arch/i386/pci/piixpcib.c : 1.4 136file sys/arch/m68k/m68k/pmap_motorola.c : 1.4 137file sys/crypto/cast128/cast128.c : 1.9 138file sys/ddb/db_command.c : 1.86 139file sys/dev/cardbus/cardbus_map.c : 1.21 140file sys/dev/fss.c : 1.25 141file sys/dev/ic/igsfb.c : 1.39 142file sys/dev/ic/mb86950.c : 1.5 143file sys/dev/ic/midway.c : 1.71 144file sys/dev/kttcp.c : 1.18 145file sys/dev/rasops/rasops_bitops.h : 1.9 146file sys/dev/pci/cmpci.c : 1.31 147file sys/dev/pci/machfb.c : 1.45 148file sys/dev/usb/ohci.c : 1.174 149file sys/dev/usb/uhci.c : 1.196 150file sys/dev/rasops/rasops_bitops.h : 1.9 151file sys/dist/ipf/netinet/ip_nat.c : 1.10 152file sys/dist/ipf/netinet/ip_rpcb_pxy.c : 1.8 153file sys/dist/pf/net/pf.c : 1.22 154file sys/fs/udf/udf_vnops.c : 1.4 155file sys/kern/kern_sig.c : 1.219 156file sys/kern/tty.c : 1.181 157file sys/net/bpf.c : 1.116 158file sys/net/zlib.c : 1.26 159file sys/netccitt/if_x25subr.c : 1.37 160file sys/netinet/in.c : 1.107 161file sys/netsmb/smb_smb.c : 1.27 162file sys/netsmb/smb_trantcp.c : 1.22 163file sys/nfs/nfs_serv.c : 1.108 164file sys/nfs/nfs_socket.c : 1.129 165file sys/nfs/nfs_syscalls.c : 1.91 166file sys/ufs/lfs/lfs_vfsops.c : 1.207 [also (char *)] 167file usr.bin/ftp/ftp.c : 1.140 168file usr.bin/find/function.c : 1.54 169file usr.bin/mail/tty.c : 1.20 170file usr.bin/msgc/msg_sys.def : 1.33-1.34 171file usr.bin/nl/nl.c : 1.7 172file usr.bin/systat/keyboard.c : 1.23 173file usr.bin/usbhidctl/usbhid.c : 1.29 174file usr.bin/vi/cl/cl_read.c : 1.5 175file usr.bin/vi/ex/ex_cscope.c : 1.12 176file usr.bin/vi/ex/ex_tag.c : 1.19 177file usr.bin/vi/vi/v_txt.c : 1.15 178file usr.sbin/altq/altqstat/qdisc_rio.c : 1.4 179file usr.sbin/cron/do_command.c : 1.19 180file usr.sbin/timed/timed/slave.c : 1.15 181descr 182 GCC 4.1 gets many uninitialised variable warnings wrong. We should 183 really audit all the old hacks like this when older compilers are 184 removed from the tree, as many are probably no longer required. 185 The problem is that it does not recognize initialization via function 186 call pointer. I.e. 187 int p; 188 foo(&p); 189 does not mark p as initialized. 190kcah 191 192hack gcc4 pointer sign and strict aliasing problems 193mdate 10 May 2006 194who mrg 195file bin/ed/Makefile : 1.33 196file distrib/utils/sysinst/Makefile.inc : 1.44 197file distrib/utils/x_dhclient/Makefile : 1.15 198file games/bcd/Makefile : 1.5 199file games/dab/Makefile : 1.5 200file games/larn/Makefile : 1.17 201file games/pom/Makefile : 1.5 202file lib/libasn1/Makefile : 1.26 203file lib/libcrypt/Makefile : 1.17 204file lib/libgssapi/Makefile : 1.16 205file lib/libhdb/Makefile : 1.20 206file lib/libkadm5clnt/Makefile : 1.21 207file lib/libkadm5srv/Makefile : 1.25 208file lib/libkrb5/Makefile : 1.35 209file lib/libssh/Makefile : 1.6 210file lib/libtelnet/Makefile : 1.26 211file libexec/getty/Makefile : 1.14 212file libexec/kadmind/Makefile : 1.19 213file libexec/kpasswdd/Makefile : 1.14 214file sbin/atactl/Makefile : 1.3 215file sbin/cgdconfig/Makefile : 1.7 216file sbin/clri/Makefile : 1.13 217file sbin/dkctl/Makefile : 1.4 218file sbin/dump/Makefile : 1.33 219file sbin/fdisk/Makefile : 1.35 220file sbin/fsck_ext2fs/Makefile : 1.11 221file sbin/fsck_ffs/Makefile : 1.29 222file sbin/fsdb/Makefile : 1.18 223file sbin/mount_smbfs/Makefile : 1.4 224file sbin/newfs/Makefile : 1.30 225file sbin/newfs_sysvbfs/Makefile : 1.2 226file sbin/restore/Makefile : 1.23 227file sbin/veriexecctl/Makefile : 1.11 228file sys/lib/libsa/Makefile : 1.59 229file sys/arch/evbarm/adi_brh/brh_machdep.c : 1.24 230file usr.bin/awk/Makefile : 1.9 231file usr.bin/crontab/Makefile : 1.24 232file usr.bin/ctags/Makefile : 1.8 233file usr.bin/gzip/Makefile : 1.10 234file usr.bin/ssh/sftp/Makefile : 1.10 235file usr.bin/ssh/ssh/Makefile : 1.25 236file usr.bin/vi/build/Makefile : 1.26 237file usr.bin/telnet/Makefile : 1.40 238file usr.bin/tn3270/tn3270/Makefile : 1.36 239file usr.bin/tr/Makefile : 1.4 240file usr.sbin/amd/amd/Makefile : 1.27 241file usr.sbin/amd/amq/Makefile : 1.14 242file usr.sbin/amd/libamu/Makefile : 1.20 243file usr.sbin/amd/pawd/Makefile : 1.5 244file usr.sbin/bind/Makefile.inc : 1.22 245file usr.sbin/bind/libdns/Makefile : 1.3 246file usr.sbin/bind/named/Makefile : 1.17 247file usr.sbin/bootp/bootptest/Makefile : 1.2 248file usr.sbin/chrtbl/Makefile : 1.6 249file usr.sbin/cron/Makefile : 1.12 250file usr.sbin/dhcp/Makefile.inc : 1.20 251file usr.sbin/dumplfs/Makefile : 1.11 252file usr.sbin/hprop/Makefile : 1.13 253file usr.sbin/installboot/Makefile : 1.35 254file usr.sbin/ipf/ipftest/Makefile : 1.32 255file usr.sbin/isdn/isdnd/Makefile : 1.6 256file usr.sbin/isdn/isdnmonitor/Makefile : 1.3 257file usr.sbin/isdn/isdntel/Makefile : 1.2 258file usr.sbin/isdn/isdntrace/Makefile : 126 259file usr.sbin/mopd/common/Makefile : 1.10 260file usr.sbin/mopd/mopd/Makefile : 1.9 261file usr.sbin/mopd/mopprobe/Makefile : 1.7 262file usr.sbin/makefs/Makefile : 1.17 263file usr.sbin/mscdlabel/Makefile : 1.5 264file usr.sbin/pkg_install/add/Makefile : 1.7 265file usr.sbin/pkg_install/create/Makefile : 1.5 266file usr.sbin/pkg_install/lib/Makefile : 1.28 267file usr.sbin/ntp/ntpd/Makefile : 1.10/1.11 268file usr.sbin/ntp/ntptime/Makefile : 1.4/1.5 269file usr.sbin/pppd/Makefile.inc : 1.3 270file usr.sbin/pppd/pppd/Makefile : 1.38 271file usr.sbin/rarpd/Makefile : 1.10 272file usr.sbin/rbootd/Makefile : 1.10 273file usr.sbin/rpc.pcnfsd/Makefile : 1.17 274file usr.sbin/rtadvd/Makefile : 1.9 275file usr.sbin/tcpdump/Makefile : 1.42 276file usr.sbin/wiconfig/Makefile : 1.3 277descr 278 GCC 4.1 warns on pointer sign comparision/assignments and lots of 279 code does not conform. For now we use -Wno-pointer-sign and 280 -fno-strict-aliasing. 281kcah 282 283hack cross-building hack on Darwin 284mdate 20 July 2008 285who agc 286file src/distrib/common/Makefile.mdset : 1.33 287descr 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 294kcah 295 296hack avoid rebuilding asn1 libraries 297mdate 03 August 2008 298who veego 299file src/crypto/dist/heimdal/lib/asn1/gen.c : 1.10 300file src/lib/libasn1/Makefile : 1.32 301file src/lib/libhdb/Makefile : 1.23 302file src/lib/libgssapi/Makefile : 1.20 303file src/lib/libhx509/Makefile : 1.3 304pr 9702 39185 305descr 306 asn1_compile does not check if generated header files do not have to 307 be rebuild. 308 Generate .hx files and copy it in the Makefiles if they changed. 309kcah 310 311port vax 312 313 hack gcc4/vax ICE 314 cdate 315 who tsutsui 316 file sys/arch/vax/conf/Makefile.vax 317 descr 318 GCC4 on vax gets ICE on compiling sys/ddb/db_command.c. 319 -fno-tree-ter prevents it so add it to COPTS. 320 kcah 321 322 hack gcc4/vax compiler crash 323 cdate Fri Jun 30 22:39:12 PDT 2006 324 who mrg 325 file bin/csh/Makefile : 1.27 326 file lib/i18n_module/UTF7/Makefile : 1.2 327 descr 328 GCC4 on vax crashes. -O0 stops it happening so far... 329 kcah 330 331 hack gcc 2.95/vax doesn't like abort being used as function pointer 332 cdate Tue Dec 13 05:54:50 GMT 2005 333 who jmc 334 file lib/libc/rpc/svc_vc.c 1.15 335 descr 336 Provide a local definition for abort which doesn't include 337 the noreturn attribute which trips up gcc 2.95 on vax. 338 kcah 339 340 hack gcc 2.95/vax doesn't have stdbool.h and gettext needs it 341 cdate Mon May 9 12:16:22 CDT 2005 342 who jmc 343 file gnu/usr.bin/gettext/Makefile.inc.prog 1.5 344 gnu/usr.bin/gettext/libgrep/Makefile 1.3 345 gnu/usr.bin/gettext/libnlspr/Makefile 1.5 346 gnu/usr.bin/gettext/libnlsut/Makefile 1.3 347 descr 348 The latest gettext assumes a C99 environment or at least 349 configure checks to work around this. As we don't use configure 350 provide a stdbool.h for vax builds locally in directories from 351 the template provided by the gettext code. 352 kcah 353 354 hack gcc 2.95/vax cannot handle __builtin_ffs() 355 cdate Fri Aug 23 21:31:15 CEST 2002 356 who ragge 357 file sys/lib/libkern/libkern.h : 1.42 358 descr 359 __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has 360 added this feature to GCC 3 so it can be removed when switching. 361 kcah 362 363 hack gcc 2.95/vax libbz2 364 mdate 27 Jun 2002 365 who thorpej 366 file lib/libbz2/Makefile 367 descr 368 libbz2 is mis-compiled with optimization with GCC 2.95.3 369 on VAX. -O0 works around this problem. 370 kcah 371 372 hack vax Toolchain bug 373 cdate 28 Mar 2003 374 who he 375 file sys/arch/vax/vax/intvec.S : 1.5 376 descr 377 Workaround for PR toolchain/20924. The assembler apparently 378 tries to range-check byte offsets when it doesn't have 379 sufficient information to make that decision. 380 Workaround uses `brw' instead of `brb' instruction. 381 kcah 382 383 hack vax gcc 2.95.3 -Wuninitialized workarounds 384 cdate 6 Nov 2003 385 who he 386 file sys/dev/bi/if_ni.c : 1.22 387 file sys/arch/vax/vax/ctu.c : 1.20 388 descr 389 Workaround for gcc 2.95.3 failing to detect that certain 390 variables will be initialized; so that this code compiles 391 with -Wuninitialized. Should be reviewed and possibly 392 reverted when gcc 3.3.2 is ready for vax. 393 kcah 394 395 hack vax gcc 2.95.3 structure initialization 396 cdat 13 May 2004 397 who cl 398 file sys/miscfs/kernfs/kernfs_vnops.c : 1.104 399 descr 400 Workaround for gcc 2.95.3 failing to initialize structures 401 and/or unions inside structures using nested designators. 402 Should be reverted when gcc >=3.3.3 is ready for vax. 403 kcah 404 405 hack vax gcc 2.95.3 needs -I. to build nslexer.c 406 cdat 6 Jun 2004 407 who mhitch 408 file lib/libc/arch/vax/Makefile.inc : 1.6 409 descr 410 It appears necessary to add -I. to CPPFLAGS when building 411 nslesxer.c. This may be caused by gcc 2.95.3 being used. 412 Should be reverted when a newer gcc is ready for vax. 413 kcah 414 415 hack vax gcc 2.95.3 doesn't understand "-std=c99" 416 cdat 5 April 2005 417 who tron 418 file src/share/mk/bsd.sys.mk 419 descr 420 We cannot use "-std=c99" for compiler warning level 4 and above 421 because gcc 2.95.3 doesn't support that option. 422 kcah 423 424 hack declare boolean_t in two IPF user-mode programs 425 cdate Tue Mar 7 19:19:20 CET 2006 426 who he 427 file dist/ipf/ipsend/iptests.c : 1.8 428 dist/ipf/ipsend/sock.c : 1.7 429 descr 430 The IPF user-mode programs ipsend and iptest first 431 include <sys/types.h> without _KERNEL defined, and 432 later include <sys/file.h> with _KERNEL defined. 433 This causes a build failure when building for vax, 434 since <sys/device.h> ends up being included without 435 bollean_t being defined by <sys/types.h>. 436 Build failure and further details documented in 437 PR#32907. 438 kcah 439 440 hack pcc 0.9.9 large string literals 441 cdat 8 July 2008 442 who gmcgarry 443 file sys/conf/param.c : 1.58 444 descr 445 Workaround for pcc 0.9.9 not handling large string literals 446 which causes kernels with 'options INCLUDE_CONFIG_FILE' to 447 fail compilation. 448 There is a proposal on the pcc mailing list to stuff config 449 file in ELF section. 450 kcah 451 452 hack xorg warnings 453 cdat 30 July 2008 454 who mrg 455 file external/mit/xorg/lib/libSM/Makefile : 1.2 456 external/mit/xorg/lib/libX11/Makefile.libx11 : 1.2 457 external/mit/xorg/lib/libXext/Makefile : 1.2 458 external/mit/xorg/lib/libXfont/Makefile : 1.2 459 descr 460 Disable several warnings or use -Wno-error across Xorg sources 461 while we get them working 462 kcah 463 464port arm 465 466 hack gcc-unsigned-compare 467 cdate 09 Mar 2002 468 mdate 18 Mar 2002 469 who bjh21 470 file dist/bind/lib/nameser/ns_parse.c : 1.3 471 file dist/dhcp/minires/ns_parse.c : 1.3 472 file dist/dhcp/omapip/result.c : 1.2 473 file dist/dhcp/server/failover.c : 1.3 474 file gnu/dist/toolchain/bfd/bfd.c : 1.2 475 file gnu/dist/toolchain/bfd/format.c : 1.2 476 file gnu/dist/toolchain/gdb/target.c : 1.2 477 file sys/kern/vfs_subr.c : 1.172 478 descr When checking that a potentially-unsigned enum is >= 0, assign 479 it to an int first. This is necessary to avoid "comparison is 480 always true" warnings with -fshort-enums. Casting to an int 481 really should be enough, but turns out not to be. 482 kcah 483 484 485port sh3 486 487 hack gcc4-sh3-bz2 488 cdate Sun May 21 03:34:57 UTC 2006 489 mdate Fri May 16 13:13:00 UTC 2008 490 who mrg, tsutsui 491 file lib/libbz2/Makefile : 1.10 492 descr 493 The in-tree GCC 4.1-based compiler generated too-far 494 pc-relative addresses. Hack is to build with 495 -fno-loop-optimize. 496 kcah 497 498 499port m68000 500 501 hack gcc4-m68000 502 cdate Fri Feb 8 10:29:37 PST 2008 503 mdate Sun May 4 15:37:19 UTC 2008 504 who mrg, tsutsui 505 file rescue/Makefile : 1.21 506 file sbin/dump_lfs/Makefile : 1.9 507 file sbin/fsck_ffs/Makefile : 1.35 508 file sbin/fsdb/Makefile : 1.22 509 file share/mk/sys.mk : 1.96 510 file usr.sbin/ndbootd/Makefile : 1.5 511 descr 512 Several internal compiler errors with gcc -O1 513 around 64bit integer arithmetic. 514 This hack uses -O1 and adds some -fno-tree-foo options 515 to avoid the problem. 516 This might be related with GCC Bugzilla Bug 32424. 517 kcah 518 519 520port sparc64 521 522 hack disable optimzations for uvm_bio.c on 32 bit kernels 523 cdate Sun Mar 21 14:14:04 MET 2004 524 who martin 525 file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54 526 file sys/arch/sparc64/conf/files.sparc64 : 1.93 527 descr 528 The sparc compiler miscompiles uvm_bio.c when using 529 any optimization. This results in ubc_release panics. 530 kcah 531 532port mips 533 534 hack mips-shared-linker-load-address 535 cdate Fri Oct 7 08:33:10 UTC 2005 536 who simonb 537 file src/sys/kern/exec_elf32.c : 1.107 538 descr 539 With COMPAT_16 or previous enabled (which enables 540 ELF_INTERP_NON_RELOCATABLE) a recent ld.elf_so will 541 load and run at address 0. The check to fix this in 542 rev 1.107 only checks the first psection of the ELF 543 executable, which may not be loadable. A more correct 544 fix is to check the first loadable psection instead of 545 just the first psection. 546 kcah 547 548 hack mips-duplicate-ras-end-label 549 cdate Sat Sep 2 23:29:42 2006 550 who martin 551 file src/regress/sys/kern/ras/ras3/Makefile : 1.3 552 descr 553 Add -fno-reorder-blocks to CFLAGS to avoid duplicate 554 labels by duplicated __asm output from RAS_END() 555 macro. 556 kcah 557 558 hack mips-mcount-assembler-warning 559 cdate Tue Jul 29 14:16:52 UTC 2008 560 who lukem 561 file src/lib/libc/gmon/Makefile.inc : 1.8 562 descr 563 Workaround for PR port-mips/39192. 564 common/lib/libc/gmon/mcount.c generates a (fatal) 565 assembler warning on MIPS: 566 Warning: No .cprestore pseudo-op used in PIC code 567 Add COPTS.count.c+=-Wa,--no-warn to avoid -Wa,--fatal-warnings 568 kcah 569 570port i386 571 572 hack use volatile intermediate variable to enforce rounding 573 cdate Tue Aug 1 22:15:55 MEST 2006 574 who drochner 575 file src/lib/libm/src/lrintf.c : 1.4 576 file src/lib/libm/src/s_rintf.c : 1.8 577 descr 578 gcc-4 does subsequent operations on "float" values within 579 the i387 FPU without rounding the intermediate results 580 kcah 581