kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS
When preprocessing arch/*/kernel/vmlinux.lds.S, the target triple is not passed to $(CPP) because we add it only to KBUILD_{C,A}FLAGS. As a result, the linker script is preprocessed with predefined macros for the build host instead of the target. Assuming you use an x86 build machine, compare the following: $ clang -dM -E -x c /dev/null $ clang -dM -E -x c /dev/null -target aarch64-linux-gnu There is no actual problem presumably because our linker scripts do not rely on such predefined macros, but it is better to define correct ones. Move $(CLANG_FLAGS) to KBUILD_CPPFLAGS, so that all *.c, *.S, *.lds.S will be processed with the proper target triple. [Note] After the patch submission, we got an actual problem that needs this commit. (CBL issue 1859) Link: https://github.com/ClangBuiltLinux/linux/issues/1859 Reported-by: Tom Rini <trini@konsulko.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Nathan Chancellor <nathan@kernel.org>
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@ -34,6 +34,5 @@ CLANG_FLAGS += -Werror=unknown-warning-option
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CLANG_FLAGS += -Werror=ignored-optimization-argument
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CLANG_FLAGS += -Werror=option-ignored
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CLANG_FLAGS += -Werror=unused-command-line-argument
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KBUILD_CFLAGS += $(CLANG_FLAGS)
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KBUILD_AFLAGS += $(CLANG_FLAGS)
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KBUILD_CPPFLAGS += $(CLANG_FLAGS)
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export CLANG_FLAGS
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