Annotation of src/doc/HACKS, Revision 1.14
1.14 ! simonb 1: # $NetBSD: HACKS,v 1.13 2003/10/27 07:26:17 simonb 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 gcc 2.95/vax cannot handle __builtin_ffs()
31: cdate Fri Aug 23 21:31:15 CEST 2002
32: who ragge
33: port vax
34: file sys/lib/libkern/libkern.h : 1.42
35: descr
36: __builtin_ffs() is ifdef'd away if __vax__. Matt Thomas has added
37: this feature to GCC 3 so it can be removed when switching.
38: kcah
39:
40: hack binutil-2.11-sparc64-pltrela
41: mdate 14 Aug 2001
42: who eeh
43: port sparc64
44: file libexec/ld.elf_so/reloc.c: 1.41 : 597 : 619
45: descr
46: The first for PLT entries are reserved. There is some disagreement
47: whether they should have associated relocation entries. Both the
48: SPARC 32-bit and 64-bit ELF specifications say that they should have
49: relocation entries, but the 32-bit SPARC binutils do not generate
50: them, and now the 64-bit SPARC binutils have stopped generating them
51: too.
52:
53: To provide binary compatibility, we will check the first entry, if it
54: is reserved it should not be of the type JMP_SLOT. If it is JMP_SLOT,
55: then the 4 reserved entries were not generated and our index is 4
56: entries too far, so we frob the rela pointer.
57: kcah
58:
59: hack netstat ieee1394 address printing.
60: mdate 14 Nov 2000
61: who matt
62: file lib/libc/net/getnameinfo.c : 1.32 : 497 : 503
63: descr
64: Because the current implementation of IP over IEEE1394, the
65: fw device address contains more than just the IEEE1394 EUI-64.
66: So when printing out IEEE1394 addresses, ignore the extra stuff.
67: kcah
68:
69: hack xterm vs. libterm
70: mdate 01 Aug 2000
71: who jdc
72: file xsrc/xc/programs/xterm/main.c : 1.2 : 3609 : 3614
73: pr 10383
74: descr
75: In order to extend the termcap string over 1023 bytes, a ZZ entry was
76: introduced to point to a memory location containing the full entry.
77: Without this hack, xterm will export a termcap containing the ZZ
78: entry, which will then be ignored by libterm. As xterm modifies the
79: exported termcap, this would cause those modifications to be ignored.
80: kcah
81:
82: hack gcc-sh3-sed
83: mdate 23 Apr 2002
84: who thorpej
85: file usr.bin/sed/Makefile : 1.9 : 9 : 13
86: descr
87: The in-tree GCC 2.95.3-based compiler ICEs when building
88: with optimization for SuperH. Hack is to biuld with -O0.
89: kcah
90:
91: hack gcc-unsigned-compare
92: cdate 09 Mar 2002
93: mdate 18 Mar 2002
94: who bjh21
95: port arm
96: file dist/bind/lib/nameser/ns_parse.c : 1.3
97: file dist/dhcp/minires/ns_parse.c : 1.3
98: file dist/dhcp/omapip/result.c : 1.2
99: file dist/dhcp/server/failover.c : 1.3
100: file gnu/dist/gawk/eval.c : 1.4
101: file gnu/dist/toolchain/bfd/bfd.c : 1.2
102: file gnu/dist/toolchain/bfd/format.c : 1.2
103: file gnu/dist/toolchain/gdb/target.c : 1.2
104: file sys/kern/vfs_subr.c : 1.172
105: descr When checking that a potentially-unsigned enum is >= 0, assign it
106: to an int first. This is necessary to avoid "comparison is always
107: true" warnings with -fshort-enums. Casting to an int really should
108: be enough, but turns out not to be.
109: kcah
110:
111: hack wi-at-big-endian-bus
112: cdate 15 Mar 2002
113: who martin
114: file dev/ic/wireg.h
115: descr Add an option to access the underlying bus in big endian byte order
116: to work around deficiencies in bus_space_{read,write}_* macros.
117: Those don't allow the implementation of a proper pcmcia bus space
118: tag.
119: kcah
120:
121: hack gcc-vax-libbz2
122: mdate 27 Jun 2002
123: who thorpej
124: port vax
125: file lib/libbz2/Makefile
126: descr
127: libbz2 is mis-compiled with optimization with GCC 2.95.3
128: on VAX. -O0 works around this problem.
129: kcah
130:
131: hack egcs-pc532-ip6_mroute
132: cdate 09 Jul 2002
133: who simonb
134: port pc532
135: file sys/arch/pc532/conf/Makefile.pc532 : 1.70
136: file sys/arch/pc532/conf/files.pc532 : 1.47
137: descr
138: egcs 1.1.2 gets an "internal error--insn does not satisfy its
139: constraints" error compiling ip6_mroute.c with -O2 or greater.
140: -O1 works around this problem.
141: kcah
142:
143: hack SuperH SH5 Toolchain Bugs
144: cdate 11 Jul 2002
145: who scw
146: port sh5
147: file usr.sbin/ndbootd/ndbootd.c : 1.6
148: file usr.sbin/traceroute/traceroute.c : 1.48
149: descr
150: The SuperH SH5 toolchain (2.97-sh5-010522) gets an internal
151: compiler error when assigning a bit-wise inverted value
152: under some circumstances.
153: Work around it by splitting the statement into two.
1.2 he 154: kcah
155:
156: hack vax Toolchain bug
157: cdate 28 Mar 2003
158: who he
159: port vax
160: file sys/arch/vax/vax/intvec.S : 1.5
161: descr
162: Workaround for PR toolchain/20924. The assembler apparently
163: tries to range-check byte offsets when it doesn't have
164: sufficient information to make that decision.
165: Workaround uses `brw' instead of `brb' instruction.
1.3 jdc 166: kcah
167:
168: hack specific knowledge of colours in curses code
169: cdate Sun Apr 6 11:05:24 BST 2003
170: who jdc
171: port all
172: file lib/libcurses/color.c : r1.24
173: descr
174: Swap red/blue and yellow/cyan colours for COLOR_OTHER.
175: Fix is to enhance libtermcap to understand terminfo-style % sequences.
176: See also:
1.5 salo 177: http://mail-index.NetBSD.org/tech-userlevel/2003/04/06/0000.html
1.4 scw 178: kcah
179:
180: hack SuperH SH5 Toolchain Bugs
181: cdate 17 May 2003
182: who scw
183: port sh5
184: file lib/libpthread/pthread_lock.c : 1.7
185: descr
186: The SuperH SH5 toolchain generates incorrect PIC code when faced
187: with a symbol which is declared extern, but has local scope due
188: to being defined within an asm() statement (without being declared
189: .globl in that statement). Work around it by adding the .globl.
1.7 he 190: kcah
191:
192: hack Compensation for differing types of LINUX_USRSTACK and USRSTACK
193: cdate 21 Aug 2003
194: who he
195: file sys/miscfs/procfs/procfs_linux.c : 1.14
196: descr
197: Not all ports have LINUX_USRSTACK and/or USRSTACK defined as
198: literals/constants, but refer to variables of a type which is
199: not "unsigned long", causing compilation of procfs_linux.c to
200: fail with "makes integer from pointer without a cast". This
201: is observed on e.g. the sun3 port. Ideally the "types" for
202: symbols should be consistent across all ports.
1.11 lukem 203: kcah
204:
205: hack gcc 3.3.x bug
206: cdate Sun Oct 26 01:50:16 UTC 2003
207: who lukem
208: port MACHINE_ARCH == arm
209: file usr.bin/newsyslog/newsyslog.c
210: pr 22986 23002 23217
211: descr
212: newsyslog fails with
213: newsyslog: config line 7: bad flags
214: solved when compiled with -fno-gcse-lm
1.13 simonb 215: kcah
216:
217: hack gcc-pc532-duffs_device
218: cdate Mon Oct 27 07:23:05 UTC 2003
219: who simonb
220: port pc532
221: file sys/arch/pc532/conf/Makefile.pc532 : 1.71
222: file sys/arch/pc532/conf/files.pc532 : 1.52
1.14 ! simonb 223: pr GCC PR optimization/5230
1.13 simonb 224: descr
225: gcc incorrectly gives an "unreachable code at beginning of switch
226: statement" for a Duff's device construct in arch/pc532/dev/ncr.c.
227: There is now way to disable just this warning, so -Wno-error is
228: turned on for this file.
1.1 lukem 229: kcah
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