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

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.

Masahiro Yamada committed 6 years ago

Commit e33ae3e1 parent 081b4b51 file · +2 −2Browse files

Unified · Split

init/Kconfig+2−2

@@ -9,7 +9,7 @@ config DEFCONFIG_LIST · 8 unmodified lines
9	9	default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
10	10
11	11	config CC_IS_GCC
12		− def_bool $(success,$(CC) --version \| head -n 1 \| grep -q gcc)
	12	+ def_bool $(success,echo "$(CC_VERSION_TEXT)" \| grep -q gcc)
13	13
14	14	config GCC_VERSION
15	15	int
@@ -21,7 +21,7 @@ config LD_VERSION · 5 unmodified lines
21	21	default $(shell,$(LD) --version \| $(srctree)/scripts/ld-version.sh)
22	22
23	23	config CC_IS_CLANG
24		− def_bool $(success,$(CC) --version \| head -n 1 \| grep -q clang)
	24	+ def_bool $(success,echo "$(CC_VERSION_TEXT)" \| grep -q clang)
25	25
26	26	config CLANG_VERSION
27	27	int