kbuild: use $(CC_VERSION_TEXT) to evaluate CC_IS_GCC and CC_IS_CLANG (e33ae3ed) · Commits · 戴 / test

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>

init/Kconfig

+2 −2

Original line number	Diff line number	Diff line
		@@ -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

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