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kconfig: add CONFIG_CC_OPTIMIZE_FOR_SIZE

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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>
This commit is contained in:
Masahiro Yamada 2014-08-22 19:42:29 +09:00 committed by Tom Rini
parent a6f47d2434
commit 4a8ed8e248
2 changed files with 15 additions and 1 deletions
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10
Kconfig
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@ -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"

6
Makefile
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@ -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)"'