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Revert "kbuild: disable clang's default use of -fmerge-all-constants"
This reverts commit 87e0d4f0f3
.
-fno-merge-all-constants has been the default since clang-6; the minimum
supported version of clang in the kernel is clang-10 (10.0.1).
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20200902225911.209899-3-ndesaulniers@google.com
Link: https://reviews.llvm.org/rL329300.
Link: https://github.com/ClangBuiltLinux/linux/issues/9
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
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1f7a44f63e
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4c207c50ea
9
Makefile
9
Makefile
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@ -921,15 +921,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
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# disable invalid "can't wrap" optimizations for signed / pointers
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KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
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# clang sets -fmerge-all-constants by default as optimization, but this
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# is non-conforming behavior for C and in fact breaks the kernel, so we
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# need to disable it here generally.
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KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
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# for gcc -fno-merge-all-constants disables everything, but it is fine
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# to have actual conforming behavior enabled.
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KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
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# Make sure -fstack-check isn't enabled (like gentoo apparently did)
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KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
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