# Compare stripped copies of two given object files.
-# Copyright (C) 2007 Free Software Foundation
+# Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation
# Originally by Alexandre Oliva <aoliva@redhat.com>
# This file is part of GCC.
# 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
exit 1
fi
-if test -f "$1".stripped; then
- echo "$1".stripped already exists, overwriting >&2
- exit 1
-fi
-
-if test -f "$2".stripped; then
- echo "$2".stripped already exists, overwriting >&2
- exit 1
-fi
-
-trap 'rm -f "$1".stripped "$2".stripped' 0 1 2 15
-
-cp "$1" "$1".stripped
-strip "$1".stripped
-
-cp "$2" "$2".stripped
-strip "$2".stripped
-
-if cmp "$1".stripped "$2".stripped; then
+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
+
+if cmp "$1.$suf1" "$2.$suf2"; then
status=0
else
status=1
+
+ # 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 -f "$1".stripped "$2".stripped
+$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
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