Annotation of src/doc/HACKS, Revision 1.43
1.43 ! tron 1: # $NetBSD: HACKS,v 1.42 2005/02/22 18:47:09 christos Exp $
1.1 lukem 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:
1.3 jdc 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:
1.5 salo 71: http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html
1.4 scw 72: kcah
73:
1.7 he 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.
1.25 mrg 85: kcah
86:
87: hack GCC2 isn't C99
88: cdate 5 December 2003
89: who mrg
90: file gnu/dist/binutils/ld/ldlex.c: r1.2
91: descr
92: ldlex.c is generated from ldlex.l and we get macro redefinition
93: errors from it if __STDC_VERSION__ is not C99 compliant. This
94: hack forces NetBSD 1.6 and later systems to also include <stdint.h>
95: to get the relevant definitions. This hack should be backed out
96: when all platforms have switched away from GCC2.
1.11 lukem 97: kcah
98:
1.37 junyoung 99: hack gcc-strict-aliasing
100: cdate 6 August 2004
101: who junyoung
102: pr 26516
103: file src/usr.sbin/racoon/racoon/Makefile : 1.21
104: descr
105: GCC issues a warning "dereferencing type-punned pointer will break
106: strict-aliasing rules" when compiling
107: crypto/dist/kame/racoon/crypto/openssl.c with -O[23s]. Note that this
1.38 junyoung 108: is due to use of type casting in a non-standard way in the code and
109: not a compiler bug. Once a new release of KAME with a proper fix
110: applied is imported this should be backed out.
1.37 junyoung 111: kcah
112:
1.13 simonb 113:
1.21 mycroft 114: port vax
115:
116: hack gcc 2.95/vax cannot handle __builtin_ffs()
117: cdate Fri Aug 23 21:31:15 CEST 2002
118: who ragge
119: file sys/lib/libkern/libkern.h : 1.42
120: descr
121: __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has
122: added this feature to GCC 3 so it can be removed when switching.
123: kcah
124:
125: hack gcc-vax-libbz2
126: mdate 27 Jun 2002
127: who thorpej
128: file lib/libbz2/Makefile
129: descr
130: libbz2 is mis-compiled with optimization with GCC 2.95.3
1.24 ragge 131: on VAX. -O0 works around this problem.
132: kcah
133:
134: hack gawk
135: mdate 8 Nov 2003
136: who ragge
137: file gnu/usr.bin/gawk/Makefile
138: descr
139: gawk is mis-compiled with optimization with GCC 2.95.3
1.21 mycroft 140: on VAX. -O0 works around this problem.
141: kcah
142:
143: hack vax Toolchain bug
144: cdate 28 Mar 2003
145: who he
146: file sys/arch/vax/vax/intvec.S : 1.5
147: descr
148: Workaround for PR toolchain/20924. The assembler apparently
149: tries to range-check byte offsets when it doesn't have
150: sufficient information to make that decision.
151: Workaround uses `brw' instead of `brb' instruction.
1.23 he 152: kcah
153:
154: hack vax gcc 2.95.3 -Wuninitialized workarounds
155: cdate 6 Nov 2003
156: who he
157: file sys/dev/bi/if_ni.c : 1.22
158: file sys/arch/vax/vax/ctu.c : 1.20
159: descr
160: Workaround for gcc 2.95.3 failing to detect that certain
161: variables will be initialized; so that this code compiles
162: with -Wuninitialized. Should be reviewed and possibly
163: reverted when gcc 3.3.2 is ready for vax.
1.21 mycroft 164: kcah
165:
1.34 cl 166: hack vax gcc 2.95.3 structure initialization
167: cdat 13 May 2004
168: who cl
169: file sys/miscfs/kernfs/kernfs_vnops.c : 1.104
170: descr
171: Workaround for gcc 2.95.3 failing to initialize structures
172: and/or unions inside structures using nested designators.
173: Should be reverted when gcc >=3.3.3 is ready for vax.
174: kcah
1.21 mycroft 175:
1.35 he 176: hack vax gcc 2.95.3 needs -I. to build nslexer.c
177: cdat 6 Jun 2004
1.36 he 178: who mhitch
179: file lib/libc/arch/vax/Makefile.inc : 1.6
1.35 he 180: descr
181: It appears necessary to add -I. to CPPFLAGS when building
182: nslesxer.c. This may be caused by gcc 2.95.3 being used.
183: Should be reverted when a newer gcc is ready for vax.
184: kcah
185:
1.43 ! tron 186: hack vax gcc 2.95.3 doesn't understand "-std=c99"
! 187: cdat 5 April 2005
! 188: who tron
! 189: file src/share/mk/bsd.sys.mk
! 190: descr
! 191: We cannot use "-std=c99" for compiler warning level 4 and above
! 192: because gcc 2.95.3 doesn't support that option.
! 193: kcah
! 194:
1.21 mycroft 195: port sparc64
196:
197: hack binutil-2.11-sparc64-pltrela
198: mdate 14 Aug 2001
199: who eeh
200: file libexec/ld.elf_so/arch/sparc64/mdreloc.c
201: descr
1.39 skrll 202: The first four PLT entries are reserved. There is some
1.21 mycroft 203: disagreement whether they should have associated relocation
204: entries. Both the SPARC 32-bit and 64-bit ELF specifications
205: say that they should have relocation entries, but the 32-bit
206: SPARC binutils do not generate them, and now the 64-bit SPARC
207: binutils have stopped generating them too.
208:
209: To provide binary compatibility, we will check the first entry,
210: if it is reserved it should not be of the type JMP_SLOT. If it
211: is JMP_SLOT, then the 4 reserved entries were not generated and
212: our index is 4 entries too far, so we frob the rela pointer.
213: kcah
214:
215:
216: port arm
217:
218: hack gcc-unsigned-compare
219: cdate 09 Mar 2002
220: mdate 18 Mar 2002
221: who bjh21
222: file dist/bind/lib/nameser/ns_parse.c : 1.3
223: file dist/dhcp/minires/ns_parse.c : 1.3
224: file dist/dhcp/omapip/result.c : 1.2
225: file dist/dhcp/server/failover.c : 1.3
226: file gnu/dist/gawk/eval.c : 1.4
227: file gnu/dist/toolchain/bfd/bfd.c : 1.2
228: file gnu/dist/toolchain/bfd/format.c : 1.2
229: file gnu/dist/toolchain/gdb/target.c : 1.2
230: file sys/kern/vfs_subr.c : 1.172
231: descr When checking that a potentially-unsigned enum is >= 0, assign
232: it to an int first. This is necessary to avoid "comparison is
233: always true" warnings with -fshort-enums. Casting to an int
234: really should be enough, but turns out not to be.
235: kcah
236:
237: hack gcc 3.3.2/arm sys/kern/uipc_socket.c
238: cdate Tue Oct 28 18:02:16 GMT 2003
239: who skrll
1.41 bjh21 240: pr 23044
241: file sys/arch/arm/conf/Makefile.arm : 1.19
1.21 mycroft 242: descr
243: Performing a build.sh tools on a CATS with NFS mounted
244: obj and src directories results in "panic: receive 1"
245: The hack is to compile sys/kern/uipc_socket.c with
246: -fno-strict-aliasing
247: kcah
248:
249:
1.13 simonb 250: port pc532
1.16 cl 251:
1.21 mycroft 252: hack egcs-pc532-ip6_mroute
253: cdate 09 Jul 2002
254: who simonb
255: file sys/arch/pc532/conf/Makefile.pc532 : 1.70
256: file sys/arch/pc532/conf/files.pc532 : 1.47
257: descr
258: egcs 1.1.2 gets an "internal error--insn does not satisfy its
259: constraints" error compiling ip6_mroute.c with -O2 or greater.
260: -O1 works around this problem.
261: kcah
262:
263: hack gcc-pc532-duffs_device
264: cdate Mon Oct 27 07:23:05 UTC 2003
265: who simonb
266: file sys/arch/pc532/conf/Makefile.pc532 : 1.71
267: file sys/arch/pc532/conf/files.pc532 : 1.52
268: pr GCC PR optimization/5230
269: descr
270: gcc incorrectly gives an "unreachable code at beginning of
271: switch statement" for a Duff's device construct in
272: arch/pc532/dev/ncr.c. There is no way to disable just this
273: warning, so -Wno-error is turned on for this file.
274: kcah
275:
1.26 simonb 276: hack gcc332-cppmacro-ice
277: cdate Sun Dec 7 12:48:33 UTC 2003
278: who simonb
279: file gnu/usr.bin/gcc3/libcpp/Makefile : 1.2
280: descr
281: gcc 3.3.2 gets an ICE when compiling cppmacro.c with -O2.
282: The hack is to use -O1 for this file. Fixed in gcc
283: -current mainline, unable to work out where the fix is
284: right now.
285: kcah
286:
1.21 mycroft 287:
288: port sh3
289:
290: hack gcc-sh3-sed
291: mdate 23 Apr 2002
292: who thorpej
293: file usr.bin/sed/Makefile : 1.9 : 9 : 13
294: descr
295: The in-tree GCC 2.95.3-based compiler ICEs when building
1.26 simonb 296: with optimization for SuperH. Hack is to build with -O0.
1.21 mycroft 297: kcah
298:
299:
300: port sh5
301:
302: hack SuperH SH5 Toolchain Bugs
303: cdate 11 Jul 2002
304: who scw
305: file usr.sbin/ndbootd/ndbootd.c : 1.6
306: file usr.sbin/traceroute/traceroute.c : 1.48
307: descr
308: The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal
309: compiler error when assigning a bit-wise inverted value
310: under some circumstances.
311: Work around it by splitting the statement into two.
312: kcah
313:
314: hack SuperH SH5 Toolchain Bugs
315: cdate 17 May 2003
316: who scw
317: file lib/libpthread/pthread_lock.c : 1.7
318: descr
319: The SuperH SH5 toolchain generates incorrect PIC code when
320: faced with a symbol which is declared extern, but has local
321: scope due to being defined within an asm() statement (without
322: being declared .globl in that statement). Work around it by
323: adding the .globl.
1.27 scw 324: kcah
325:
326: hack gcc 3.3.2 on sh5 - ICE compiling reload1.c at -O2
327: cdate Sun Dec 7 19:44:05 GMT 2003
328: who scw
329: file gnu/usr.bin/gcc3/backend/Makefile : 1.13
330: descr
331: Gcc3 for sh5 gets an ICE compiling reload1.c at -O2.
332: Drop to -O1 for now when building for sh5.
333: kcah
1.28 scw 334:
335: hack gcc 3.3.2 on sh5 - ICE compiling elf32.c/elf64.c at -O2
336: cdate Sun Dec 7 21:10:46 GMT 2003
337: who scw
338: file gnu/lib/libbfd/Makefile : 1.39
339: descr
340: Gcc3 for sh5 gets an ICE compiling libbfd's elf32.c
341: and elf64.c at -O2.
342: Drop to -O1 for now when building for sh5.
343: kcah
344:
1.27 scw 345:
346: hack gcc 3.3.2 on sh5 - fatal warning compiling function.c
347: cdate Sun Dec 7 19:44:05 GMT 2003
348: who scw
349: file gnu/usr.bin/gcc3/backend/Makefile : 1.13
350: descr
351: Gcc3 for sh5 issues a warning:
352: .../gnu/dist/gcc/gcc/function.c:4742: warning: `and' of
353: mutually exclusive equal-tests is always 0.
354: This causes the build to fail because of -Werror.
355: Work-around by defining NOGCCERROR when building for sh5.
356: kcah
357:
1.40 he 358: hack gcc 3.3.3 on sh5 - ICE compiling rbtdb.c and rbtdb64.c
359: cdate Thu Nov 11 00:35:33 UTC 2004
360: who he
361: file usr.sbin/bind/libdns/Makefile/1.2
1.27 scw 362: descr
1.40 he 363: Gcc3 for sh5 gets an ICE compiling these files at -O2.
1.27 scw 364: Drop to -O1 for now when building for sh5.
1.21 mycroft 365: kcah
1.17 mrg 366:
367:
368: port sun2
1.20 skrll 369:
1.21 mycroft 370: hack gcc 3.3.2/mdsetimage
371: cdate Tue Oct 28 18:43:05 EST 2003
372: who fredette
373: file gnu/usr.sbin/mdsetimage/Makefile : 1.15
374: descr
375: mdsetimage.c causes cc1 to barf for as-yet unknown reasons.
1.26 simonb 376: this hack uses -O0 to avoid the problem.
1.21 mycroft 377: kcah
378:
379: hack gcc 3.3.2/installboot/ffs.c
380: cdate Tue Oct 28 18:43:05 EST 2003
381: who fredette
382: file usr.sbin/installboot/Makefile : 1.26
383: descr
384: ffs.c causes cc1 to barf for as-yet unknown reasons. this
1.26 simonb 385: hack uses -O0 to avoid the problem.
1.22 mrg 386: kcah
387:
388:
389: port sun2, m68k
390:
391: hack gcc 3.3.2/gcc/ra-colorize.c
392: cdate Wed Nov 5 11:03:13 EST 2003
393: who mrg
394: file gnu/usr.bin/gcc/backend/Makefile : 1.11
395: descr
396: ra-colorize.c causes a whole spew of unreferenced .L* local
397: symbols. using -O0 (or even -O2 reportedly) avoids the problem.
1.21 mycroft 398: kcah
1.31 martin 399:
400: port sparc64
401:
402: hack disable optimzations for uvm_bio.c on 32 bit kernels
403: cdate Sun Mar 21 14:14:04 MET 2004
404: who martin
1.32 martin 405: file sys/arch/sparc64/conf/Makefile.sparc64 : 1.53-1.54
406: file sys/arch/sparc64/conf/files.sparc64 : 1.93
1.31 martin 407: descr
408: The sparc compiler miscompiles uvm_bio.c when using
409: any optimization. This results in ubc_release panics.
410: kcah
1.42 christos 411:
412: port macppc
413:
414: hack remove inline from rotate_{left,right}
415: cdate Tue Feb 22 13:43:25 EST 2005
416: who christos
417: file src/dist/bind/lib/dns/rbt.c
418: descr
419: The macppc gcc-3.3 compiler miscompiles rbt.c when these
420: functions are inlined. The error is:
421: .* named[368]: rbt.c:1584: INSIST(child != (void *)0) >failed
422: .* named[368]: exiting (due to assertion failure)
423: This is reportedly fixed in gcc-3.4
424: kcah
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