s390/build: use size command to perform empty .bss check

Currently empty .bss checks performed do not pay attention to "common
objects" in object files which end up in .bss section eventually.

The "size" tool is a part of binutils and since version 2.18 provides
"--common" command line option, which allows to account "common objects"
sizes in .bss section size. Utilize "size --common" to perform accurate
check that .bss section is unused. Besides that the size tool handles
object files without .bss section gracefully and doesn't require
additional objdump run.

The linux kernel requires binutils 2.20 since 4.13.

Kbuild exports OBJSIZE to reference the right size tool.

Link: http://lkml.kernel.org/r/patch-2.thread-2257a1.git-2257a1c53d4a.your-ad-here.call-01565088755-ext-5120@work.hours
Reported-and-tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/scripts/Makefile.chkbss b/arch/s390/scripts/Makefile.chkbss
index 884a9caff5fb8be71c80fce894d78ef1fe5f955d..f4f4c2c6dee9eeae8a0b197538ed16d7cf1ed51d 100644 (file)
--- a/arch/s390/scripts/Makefile.chkbss
+++ b/arch/s390/scripts/Makefile.chkbss
@@ -11,8 +11,7 @@ chkbss: $(addprefix $(obj)/, $(chkbss-files))
 
 quiet_cmd_chkbss = CHKBSS  $<
       cmd_chkbss = \
-       if $(OBJDUMP) -h $< | grep -q "\.bss" && \
-          ! $(OBJDUMP) -j .bss -w -h $< | awk 'END { if ($$3) exit 1 }'; then \
+       if ! $(OBJSIZE) --common $< | $(AWK) 'END { if ($$3) exit 1 }'; then \
                echo "error: $< .bss section is not empty" >&2; exit 1; \
        fi; \
        touch $@;