From: Behan Webster <behanw@converseincode.com>
Date: Tue, 28 Mar 2017 01:19:09 +0000 (-0700)
Subject: kbuild: use -Oz instead of -Os when using clang
X-Git-Tag: v4.9.139~43
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d438cec0737451e3615c4665592b6df0858de41a;p=platform%2Fkernel%2Flinux-amlogic.git

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>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/Makefile b/Makefile
index 7e87a0edb037..8bfe90febc1e 100644
--- a/Makefile
+++ b/Makefile
@@ -644,7 +644,8 @@ KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
 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,)