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kbuild: use $(CC_VERSION_TEXT) to evaluate CC_IS_GCC and CC_IS_CLANG

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The result of '$(CC) --version | head -n 1' has already been computed
by the top Makefile, and stored in the environment variable,
CC_VERSION_TEXT.

'echo' is cheaper than the two commands $(CC) and 'head' although this
optimization is not noticeable level.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
This commit is contained in:
Masahiro Yamada 2020-04-23 23:23:51 +09:00
parent 081b4b54ff
commit e33ae3ed33
1 changed files with 2 additions and 2 deletions
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4
init/Kconfig
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@ -9,7 +9,7 @@ config DEFCONFIG_LIST
default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
config CC_IS_GCC
def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)
config GCC_VERSION
int
@ -21,7 +21,7 @@ config LD_VERSION
default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
config CC_IS_CLANG
def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang)
config CLANG_VERSION
int