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 | 10 ++++++++++ Makefile | 6 +++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Kconfig b/Kconfig index ea2c836..cbb691e 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 2938dec..95e298b 100644 --- a/Makefile +++ b/Makefile @@ -533,7 +533,11 @@ 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)"'