commit 5db0ac53e751f236c065323c503445ce6c9a5177
author Behan Webster <behanw@converseincode.com> Mon Mar 27 18:19:09 2017 -0700
committer Greg Hackmann <ghackmann@google.com> Mon Oct 16 15:30:37 2017 -0700
tree 8c0cf4c0838e8d3de16a0f43ab9786acd3751e15
parent 70de9b20fa2a48c5c2bc4a5c68e2a22240a07650

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

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>
(cherry picked from commit 6748cb3c299de1ffbe56733647b01dbcc398c419)

Makefile

diff --git a/Makefile b/Makefile
index f048e29..cfb3289 100644
--- a/Makefile
+++ b/Makefile
@@ -639,7 +639,8 @@
 endif
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
+KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
 else
 ifdef CONFIG_PROFILE_ALL_BRANCHES
 KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)