scripts: objdiff: Ignore debug info when comparing

If the kernel is configured to be built with debug symbols, or
has bug tables, comparing files may not work if line numbers
change. This makes comparing object files with these options
harder to do. Let's strip out the debug info and drop the
__bug_table here so that we don't see false positives. There may
be other things to drop later, and it may be architecture
specific, but this works for me with my ARM64 build.

Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Reviewed-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/scripts/objdiff b/scripts/objdiff
index 62e51dae2138db450555f3d15dbd14cc53c53652..4fb5d67968932bbf83fbdc63ee84c374d552fa41 100755 (executable)
--- a/scripts/objdiff
+++ b/scripts/objdiff
@@ -57,13 +57,15 @@ get_output_dir() {
 do_objdump() {
        dir=$(get_output_dir $1)
        base=${1##*/}
+       stripped=$dir/${base%.o}.stripped
        dis=$dir/${base%.o}.dis
 
        [ ! -d "$dir" ] && mkdir -p $dir
 
        # remove addresses for a cleaner diff
        # http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
-       $OBJDUMP -D $1 | sed "s/^[[:space:]]\+[0-9a-f]\+//" > $dis
+       $STRIP -g $1 -R __bug_table -R .note -R .comment -o $stripped
+       $OBJDUMP -D $stripped | sed -e "s/^[[:space:]]\+[0-9a-f]\+//" -e "s:^$stripped:$1:" > $dis
 }
 
 dorecord() {
@@ -73,6 +75,7 @@ dorecord() {
 
        CMT="`git rev-parse --short HEAD`"
 
+       STRIP="${CROSS_COMPILE}strip"
        OBJDUMP="${CROSS_COMPILE}objdump"
 
        for d in $FILES; do