Daily bump.
[official-gcc.git] / contrib / compare-debug
blob22870cf8e048083abef8e2597f84727eb89d6c9a
1 #! /bin/sh
3 # Compare stripped copies of two given object files.
5 # Copyright (C) 2007, 2008, 2009, 2010, 2012 Free Software Foundation
6 # Originally by Alexandre Oliva <aoliva@redhat.com>
8 # This file is part of GCC.
10 # GCC is free software; you can redistribute it and/or modify it under
11 # the terms of the GNU General Public License as published by the Free
12 # Software Foundation; either version 3, or (at your option) any later
13 # version.
15 # GCC is distributed in the hope that it will be useful, but WITHOUT
16 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
18 # License for more details.
20 # You should have received a copy of the GNU General Public License
21 # along with GCC; see the file COPYING3. If not see
22 # <http://www.gnu.org/licenses/>.
24 rm='rm -f'
26 case $1 in
27 -p | --preserve)
28 rm='echo preserving'
29 shift
31 esac
33 if test $# != 2; then
34 echo 'usage: compare-debug file1.o file2.o' >&2
35 exit 1
38 if test ! -f "$1"; then
39 echo "$1" does not exist >&2
40 exit 1
43 if test ! -f "$2"; then
44 echo "$2" does not exist >&2
45 exit 1
48 suf1=stripped
49 while test -f "$1.$suf1"; do
50 suf1=$suf1.
51 done
53 suf2=stripped
54 while test -f "$2.$suf2"; do
55 suf2=$suf2.
56 done
58 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
60 case `uname -s` in
61 Darwin)
62 # The strip command on darwin does not remove all debug info.
63 # Fortunately, we can use ld to do it instead.
64 ld -S -r -no_uuid "$1" -o "$1.$suf1"
65 ld -S -r -no_uuid "$2" -o "$2.$suf2"
68 cp "$1" "$1.$suf1"
69 strip "$1.$suf1"
71 cp "$2" "$2.$suf2"
72 strip "$2.$suf2"
74 esac
76 remove_comment ()
78 file=$1
79 opts=
80 for s in `objdump --section-headers "$file" | awk '{ print $2 }'`; do
81 case "$s" in
82 .comment*)
83 opts="$opts --remove-section $s"
85 esac
86 done
87 [ -n "$opts" ] && objcopy $opts $file
90 if cmp "$1.$suf1" "$2.$suf2"; then
91 status=0
92 else
93 status=1
95 # Remove any .comment sections.
96 if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null \
97 && (objdump --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
98 remove_comment "$1.$suf1"
99 remove_comment "$2.$suf2"
100 if cmp "$1.$suf1" "$2.$suf2"; then
101 status=0
105 # Assembler-generated CFI will add an .eh_frame section for -g not
106 # present in -g0. Try to cope with it by checking that an .eh_frame
107 # section is present in either object file, and then stripping it
108 # off before re-comparing.
110 cmd=
111 cmp1=
112 cmp2=
114 for t in objdump readelf eu-readelf; do
115 if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
116 cmd=$t
118 $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null
119 cmp1=$?
121 $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null
122 cmp2=$?
124 break
126 done
128 # If we found .eh_frame in one but not the other, or if we could not
129 # find a command to tell, or if there are LTO sections, try to strip
130 # off the .eh_frame and LTO sections from both.
131 if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x" ||
132 $cmd --section-headers "$1.$suf1" | grep '.gnu.lto_' > /dev/null ||
133 $cmd --section-headers "$2.$suf2" | grep '.gnu.lto_' > /dev/null ; then
134 suf3=$suf1.
135 while test -f "$1.$suf3"; do
136 suf3=$suf3.
137 done
139 suf4=$suf2.
140 while test -f "$2.$suf4"; do
141 suf4=$suf4.
142 done
144 trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15
146 echo stripping off .eh_frame and LTO sections, then retrying >&2
148 seclist=".eh_frame .rel.eh_frame .rela.eh_frame"
149 if test "x$cmd" != "x"; then
150 seclist="$seclist "`{ $cmd --section-headers "$1.$suf1"; $cmd --section-headers "$2.$suf2"; } | sed -n 's,.* \(\.gnu\.lto_[^ ]*\).*,\1,p' | sort -u`
152 rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done`
154 if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
155 objcopy $rsopts "$1.$suf1" "$1.$suf3"
156 mv "$1.$suf3" "$1.$suf1"
158 objcopy $rsopts "$2.$suf2" "$2.$suf4"
159 mv "$2.$suf4" "$2.$suf2"
160 elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
161 cp "$1.$suf1" "$1.$suf3"
162 strip $rsopts "$1.$suf3"
163 mv "$1.$suf3" "$1.$suf1"
165 cp "$2.$suf2" "$2.$suf4"
166 strip $rsopts "$2.$suf4"
167 mv "$2.$suf4" "$2.$suf2"
168 else
169 echo failed to strip off .eh_frame >&2
172 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
174 if cmp "$1.$suf1" "$2.$suf2"; then
175 status=0
176 else
177 status=1
182 $rm "$1.$suf1" "$2.$suf2"
184 trap "exit $status; exit" 0 1 2 15
186 if test -f "$1".gkd || test -f "$2".gkd; then
187 if cmp "$1".gkd "$2".gkd; then
189 else
190 status=$?
194 exit $status