linux-kernel - [PATCH 4.9 17/59] kbuild: use -Oz instead of -Os when using clang

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Date:   Wed, 21 Nov 2018 20:06:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Behan Webster <behanw@...verseincode.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH 4.9 17/59] kbuild: use -Oz instead of -Os when using clang

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Behan Webster <behanw@...verseincode.com>

commit 6748cb3c299de1ffbe56733647b01dbcc398c419 upstream.

This generates smaller resulting object code when compiled with clang.

Signed-off-by: Behan Webster <behanw@...verseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Makefile |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/Makefile
+++ b/Makefile
@@ -644,7 +644,8 @@ KBUILD_CFLAGS	+= $(call cc-option,-fdata
 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,)