#! /bin/sh # Compare stripped copies of two given object files. # Copyright (C) 2007, 2008, 2009, 2010, 2012 Free Software Foundation # Originally by Alexandre Oliva <aoliva@redhat.com> # This file is part of GCC. # GCC is free software; you can redistribute it and/or modify it under # the terms of the GNU General Public License as published by the Free # Software Foundation; either version 3, or (at your option) any later # version. # GCC is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public # License for more details. # You should have received a copy of the GNU General Public License # along with GCC; see the file COPYING3. If not see # <http://www.gnu.org/licenses/>. rm='rm -f' case $1 in -p | --preserve) rm='echo preserving' shift ;; esac if test $# != 2; then echo 'usage: compare-debug file1.o file2.o' >&2 exit 1 fi if test ! -f "$1"; then echo "$1" does not exist >&2 exit 1 fi if test ! -f "$2"; then echo "$2" does not exist >&2 exit 1 fi suf1=stripped while test -f "$1.$suf1"; do suf1=$suf1. done suf2=stripped while test -f "$2.$suf2"; do suf2=$suf2. done trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 case `uname -s` in Darwin) # The strip command on darwin does not remove all debug info. # Fortunately, we can use ld to do it instead. ld -S -r -no_uuid "$1" -o "$1.$suf1" ld -S -r -no_uuid "$2" -o "$2.$suf2" ;; *) cp "$1" "$1.$suf1" strip "$1.$suf1" cp "$2" "$2.$suf2" strip "$2.$suf2" ;; esac remove_comment () { file=$1 opts= for s in `objdump --section-headers "$file" | awk '{ print $2 }'`; do case "$s" in .comment*) opts="$opts --remove-section $s" ;; esac done [ -n "$opts" ] && objcopy $opts $file } if cmp "$1.$suf1" "$2.$suf2"; then status=0 else status=1 # Remove any .comment sections. if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null \ && (objdump --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then remove_comment "$1.$suf1" remove_comment "$2.$suf2" if cmp "$1.$suf1" "$2.$suf2"; then status=0 fi fi # Assembler-generated CFI will add an .eh_frame section for -g not # present in -g0. Try to cope with it by checking that an .eh_frame # section is present in either object file, and then stripping it # off before re-comparing. cmd= cmp1= cmp2= for t in objdump readelf eu-readelf; do if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then cmd=$t $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null cmp1=$? $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null cmp2=$? break fi done # If we found .eh_frame in one but not the other, or if we could not # find a command to tell, or if there are LTO sections, try to strip # off the .eh_frame and LTO sections from both. if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x" || $cmd --section-headers "$1.$suf1" | grep '.gnu.lto_' > /dev/null || $cmd --section-headers "$2.$suf2" | grep '.gnu.lto_' > /dev/null ; then suf3=$suf1. while test -f "$1.$suf3"; do suf3=$suf3. done suf4=$suf2. while test -f "$2.$suf4"; do suf4=$suf4. done trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15 echo stripping off .eh_frame and LTO sections, then retrying >&2 seclist=".eh_frame .rel.eh_frame .rela.eh_frame" if test "x$cmd" != "x"; then seclist="$seclist "`{ $cmd --section-headers "$1.$suf1"; $cmd --section-headers "$2.$suf2"; } | sed -n 's,.* \(\.gnu\.lto_[^ ]*\).*,\1,p' | sort -u` fi rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done` if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then objcopy $rsopts "$1.$suf1" "$1.$suf3" mv "$1.$suf3" "$1.$suf1" objcopy $rsopts "$2.$suf2" "$2.$suf4" mv "$2.$suf4" "$2.$suf2" elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then cp "$1.$suf1" "$1.$suf3" strip $rsopts "$1.$suf3" mv "$1.$suf3" "$1.$suf1" cp "$2.$suf2" "$2.$suf4" strip $rsopts "$2.$suf4" mv "$2.$suf4" "$2.$suf2" else echo failed to strip off .eh_frame >&2 fi trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 if cmp "$1.$suf1" "$2.$suf2"; then status=0 else status=1 fi fi fi $rm "$1.$suf1" "$2.$suf2" trap "exit $status; exit" 0 1 2 15 if test -f "$1".gkd || test -f "$2".gkd; then if cmp "$1".gkd "$2".gkd; then : else status=$? fi fi exit $status