From: Masahiro Yamada <yamada.m@jp.panasonic.com>
Date: Fri, 22 Aug 2014 10:42:29 +0000 (+0900)
Subject: kconfig: add CONFIG_CC_OPTIMIZE_FOR_SIZE
X-Git-Tag: v2014.10-rc2~66
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=4a8ed8e24886adf47086125f81307eaa8c358437;p=u-boot

kconfig: add CONFIG_CC_OPTIMIZE_FOR_SIZE

Copy the Kconfig option from "init/Kconfig" of Linux v3.16 tag
and adjust the help document.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
---

diff --git a/Kconfig b/Kconfig
index ea2c836115..cbb691e160 100644
--- a/Kconfig
+++ b/Kconfig
@@ -46,6 +46,16 @@ config LOCALVERSION_AUTO
 
 	  which is done within the script "scripts/setlocalversion".)
 
+config CC_OPTIMIZE_FOR_SIZE
+	bool "Optimize for size"
+	depends on !SPL_BUILD
+	default y
+	help
+	  Enabling this option will pass "-Os" instead of "-O2" to gcc
+	  resulting in a smaller U-Boot image.
+
+	  This option is enabled by default for U-Boot.
+
 endmenu		# General setup
 
 menu "Boot images"
diff --git a/Makefile b/Makefile
index 0fea5c2681..9646859083 100644
--- a/Makefile
+++ b/Makefile
@@ -529,7 +529,11 @@ else
 include/config/auto.conf: ;
 endif # $(dot-config)
 
-KBUILD_CFLAGS += -Os #-fomit-frame-pointer
+ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
+KBUILD_CFLAGS	+= -Os
+else
+KBUILD_CFLAGS	+= -O2
+endif
 
 ifdef BUILD_TAG
 KBUILD_CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'