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