1 #! /bin/sh 2 3 # Compare stripped copies of two given object files. 4 5 # Copyright (C) 2007-2024 Free Software Foundation, Inc. 6 # Originally by Alexandre Oliva <aoliva (at] redhat.com> 7 8 # This file is part of GCC. 9 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. 14 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. 19 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/>. 23 24 rm='rm -f' 25 26 case $1 in 27 -p | --preserve) 28 rm='echo preserving' 29 shift 30 ;; 31 esac 32 33 if test $# != 2; then 34 echo 'usage: compare-debug file1.o file2.o' >&2 35 exit 1 36 fi 37 38 if test ! -f "$1"; then 39 echo "$1" does not exist >&2 40 exit 1 41 fi 42 43 if test ! -f "$2"; then 44 echo "$2" does not exist >&2 45 exit 1 46 fi 47 48 suf1=stripped 49 while test -f "$1.$suf1"; do 50 suf1=$suf1. 51 done 52 53 suf2=stripped 54 while test -f "$2.$suf2"; do 55 suf2=$suf2. 56 done 57 58 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 59 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" 66 ;; 67 *) 68 cp "$1" "$1.$suf1" 69 strip "$1.$suf1" 70 71 cp "$2" "$2.$suf2" 72 strip "$2.$suf2" 73 ;; 74 esac 75 76 remove_comment () 77 { 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 $s" 84 ;; 85 esac 86 done 87 [ -n "$opts" ] && objcopy $opts $file 88 } 89 90 if cmp "$1.$suf1" "$2.$suf2"; then 91 status=0 92 else 93 status=1 94 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=0 102 fi 103 fi 104 105 # 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. 109 110 cmd= 111 cmp1= 112 cmp2= 113 114 for t in objdump readelf eu-readelf; do 115 if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then 116 cmd=$t 117 118 $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null 119 cmp1=$? 120 121 $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null 122 cmp2=$? 123 124 break 125 fi 126 done 127 128 # If we found .eh_frame in one but not the other, or if we could not 129 # find a command to tell, or if there are LTO sections, try to strip 130 # off the .eh_frame and LTO sections from both. 131 if test "x$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=$suf3. 137 done 138 139 suf4=$suf2. 140 while test -f "$2.$suf4"; do 141 suf4=$suf4. 142 done 143 144 trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15 145 146 echo stripping off .eh_frame and LTO sections, then retrying >&2 147 148 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` 151 fi 152 rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done` 153 154 if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then 155 objcopy $rsopts "$1.$suf1" "$1.$suf3" 156 mv "$1.$suf3" "$1.$suf1" 157 158 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" 164 165 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 >&2 170 fi 171 172 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 173 174 if cmp "$1.$suf1" "$2.$suf2"; then 175 status=0 176 else 177 status=1 178 fi 179 fi 180 fi 181 182 $rm "$1.$suf1" "$2.$suf2" 183 184 trap "exit $status; exit" 0 1 2 15 185 186 # Replace the suffix in $1 and $2 with .*.gkd, compare them if a 187 # single file is found by the globbing. 188 base1=`echo "$1" | sed '$s,\.[^.]*$,,'` gkd1= 189 for f in "$base1".*.gkd; do 190 if test "x$gkd1" != x; then 191 gkd1= 192 break 193 elif test -f "$f"; then 194 gkd1=$f 195 fi 196 done 197 base2=`echo "$2" | sed '$s,\.[^.]*$,,'` gkd2= 198 for f in "$base2".*.gkd; do 199 if test "x$gkd2" != x; then 200 gkd2= 201 break 202 elif test -f "$f"; then 203 gkd2=$f 204 fi 205 done 206 if test "x$gkd1" != x || test "x$gkd2" != x; then 207 if cmp "${gkd1-/dev/null}" "${gkd2-/dev/null}"; then 208 : 209 else 210 status=$? 211 fi 212 fi 213 214 exit $status 215
Indexes created Sat Jun 06 00:24:59 UTC 2026