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authorArnd Bergmann <arnd@arndb.de>2022-03-08 22:56:15 +0100
committerMasahiro Yamada <masahiroy@kernel.org>2022-03-13 17:31:44 +0900
commit1e24078113ae69c741cb1b03375a9f1490db7308 (patch)
treee0c9caab2596def1e000712ff205a8392067b3ea /Makefile
parente8c07082a810fbb9db303a2b66b66b8d7e588b53 (diff)
Kbuild: use -std=gnu11 for KBUILD_USERCFLAGS
As we change the C language standard for the kernel from gnu89 to gnu11, it makes sense to also update the version for user space compilation. Some users have older native compilers than what they use for kernel builds, so I considered using gnu99 as the default version for wider compatibility with gcc-4.6 and earlier. However, testing with older compilers showed that we already require HOSTCC version 5.1 as well because a lot of host tools include linux/compiler.h that uses __has_attribute(): CC tools/objtool/exec-cmd.o In file included from tools/include/linux/compiler_types.h:36:0, from tools/include/linux/compiler.h:5, from exec-cmd.c:2: tools/include/linux/compiler-gcc.h:19:5: error: "__has_attribute" is not defined [-Werror=undef] Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 19b4f75d42c2..8a18fa1e19a7 100644
--- a/Makefile
+++ b/Makefile
@@ -432,7 +432,7 @@ HOSTCXX = g++
endif
export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
- -O2 -fomit-frame-pointer -std=gnu89 \
+ -O2 -fomit-frame-pointer -std=gnu11 \
-Wdeclaration-after-statement
export KBUILD_USERLDFLAGS :=