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>

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>
Masahiro Yamada · Tom Rini
1 parent a6f47d2434
Showing 2 changed files with 15 additions and 1 deletions Side-by-side Diff
Kconfig
Makefile
@@ -46,6 +46,16 @@
  
 	  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"
@@ -529,7 +529,11 @@
 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)"'
...	...	@@ -46,6 +46,16 @@
46	46
47	47	which is done within the script "scripts/setlocalversion".)
48	48
	49	+config CC_OPTIMIZE_FOR_SIZE
	50	+ bool "Optimize for size"
	51	+ depends on !SPL_BUILD
	52	+ default y
	53	+ help
	54	+ Enabling this option will pass "-Os" instead of "-O2" to gcc
	55	+ resulting in a smaller U-Boot image.
	56	+
	57	+ This option is enabled by default for U-Boot.
	58	+
49	59	endmenu # General setup
50	60
51	61	menu "Boot images"
...	...	@@ -529,7 +529,11 @@
529	529	include/config/auto.conf: ;
530	530	endif # $(dot-config)
531	531
532		-KBUILD_CFLAGS += -Os #-fomit-frame-pointer
	532	+ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
	533	+KBUILD_CFLAGS += -Os
	534	+else
	535	+KBUILD_CFLAGS += -O2
	536	+endif
533	537
534	538	ifdef BUILD_TAG
535	539	KBUILD_CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'