kbuild: use -Oz instead of -Os when using clang

commit 6748cb3c299de1ffbe56733647b01dbcc398c419 upstream.

This generates smaller resulting object code when compiled with clang.

Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
[nc: Adjust context due to lack of commit a76bcf557ef4 in linux-4.4.y]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Makefile b/Makefile
index 0fffa99..c9e27ba 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -628,7 +628,7 @@ KBUILD_CFLAGS       += $(call cc-disable-warning, int-in-bool-context)
 KBUILD_CFLAGS  += $(call cc-disable-warning, attribute-alias)
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS  += -Os
+KBUILD_CFLAGS  += $(call cc-option,-Oz,-Os)
 else
 ifdef CONFIG_PROFILE_ALL_BRANCHES
 KBUILD_CFLAGS  += -O2