path: root/init/Kconfig
diff options
authorMasahiro Yamada <masahiroy@kernel.org>2021-01-16 08:35:42 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2021-02-16 12:01:32 +0900
commitaec6c60a01d3a3170242d6a99372a388e1136dc6 (patch)
treeaac4077abb04923db60033406535c3a128bf9d2c /init/Kconfig
parent052c805a1851a4415f9e2adfa9654a0b793e0c45 (diff)
kbuild: check the minimum compiler version in Kconfig
Paul Gortmaker reported a regression in the GCC version check. [1] If you use GCC 4.8, the build breaks before showing the error message "error Sorry, your version of GCC is too old - please use 4.9 or newer." I do not want to apply his fix-up since it implies we would not be able to remove any cc-option test. Anyway, I admit checking the GCC version in <linux/compiler-gcc.h> is too late. Almost at the same time, Linus also suggested to move the compiler version error to Kconfig time. [2] I unified the two similar scripts, gcc-version.sh and clang-version.sh into cc-version.sh. The old scripts invoked the compiler multiple times (3 times for gcc-version.sh, 4 times for clang-version.sh). I refactored the code so the new one invokes the compiler just once, and also tried my best to use shell-builtin commands where possible. The new script runs faster. $ time ./scripts/clang-version.sh clang 120000 real 0m0.029s user 0m0.012s sys 0m0.021s $ time ./scripts/cc-version.sh clang Clang 120000 real 0m0.009s user 0m0.006s sys 0m0.004s cc-version.sh also shows an error message if the compiler is too old: $ make defconfig CC=clang-9 *** Default configuration is based on 'x86_64_defconfig' *** *** Compiler is too old. *** Your Clang version: 9.0.1 *** Minimum Clang version: 10.0.1 *** scripts/Kconfig.include:46: Sorry, this compiler is not supported. make[1]: *** [scripts/kconfig/Makefile:81: defconfig] Error 1 make: *** [Makefile:602: defconfig] Error 2 The new script takes care of ICC because we have <linux/compiler-intel.h> although I am not sure if building the kernel with ICC is well-supported. [1]: https://lore.kernel.org/r/20210110190807.134996-1-paul.gortmaker@windriver.com [2]: https://lore.kernel.org/r/CAHk-=wh-+TMHPTFo1qs-MYyK7tZh-OQovA=pP3=e06aCVp6_kA@mail.gmail.com Fixes: 87de84c9140e ("kbuild: remove cc-option test of -Werror=date-time") Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Tested-by: Miguel Ojeda <ojeda@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'init/Kconfig')
1 files changed, 5 insertions, 4 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 29ad68325028..7bcfa24524c2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -26,11 +26,11 @@ config CC_VERSION_TEXT
and then every file will be rebuilt.
config CC_IS_GCC
- def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)
+ def_bool $(success,test "$(cc-name)" = GCC)
- default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
+ default $(cc-version) if CC_IS_GCC
default 0
@@ -38,14 +38,15 @@ config LD_VERSION
default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
config CC_IS_CLANG
- def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang)
+ def_bool $(success,test "$(cc-name)" = Clang)
config LD_IS_LLD
def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
- default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
+ default $(cc-version) if CC_IS_CLANG
+ default 0

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