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kbuild: remove cc-option test of -fno-strict-overflow 

The minimal compiler versions, GCC 4.9 and Clang 10 support this flag.

Here is the godbolt:
https://godbolt.org/z/odq8h9

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Will Deacon <will@kernel.org>
This commit is contained in:
Masahiro Yamada 2020-09-10 22:51:17 +09:00
parent bb2732112b
commit 8b42cf2fde
2 changed files with 2 additions and 2 deletions
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2
Makefile
View File

@ -928,7 +928,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
KBUILD_CFLAGS += -fno-strict-overflow
# clang sets -fmerge-all-constants by default as optimization, but this
# is non-conforming behavior for C and in fact breaks the kernel, so we

2
arch/arm64/kernel/vdso32/Makefile
View File

@ -90,7 +90,7 @@ VDSO_CFLAGS += -O2
# Some useful compiler-dependent flags from top-level Makefile
VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
VDSO_CFLAGS += $(call cc32-option,-fno-strict-overflow)
VDSO_CFLAGS += -fno-strict-overflow
VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
VDSO_CFLAGS += $(call cc32-option,-Werror=date-time)
VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)