diff options
| author | Masahiro Yamada <masahiroy@kernel.org> | 2023-04-09 23:53:57 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-06-05 09:50:44 +0900 |
| commit | feb843a469fb0ab00d2d23cfb9bcc379791011bb (patch) | |
| tree | 2c90f8a084b88faca0df9a9ebfb67f872544af62 | |
| parent | cff6e7f50bd315e5b39c4e46c704ac587ceb965f (diff) | |
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>
| -rw-r--r-- | scripts/Makefile.clang | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang index 9076cc939e87..058a4c0f864e 100644 --- a/scripts/Makefile.clang +++ b/scripts/Makefile.clang @@ -34,6 +34,5 @@ CLANG_FLAGS += -Werror=unknown-warning-option CLANG_FLAGS += -Werror=ignored-optimization-argument CLANG_FLAGS += -Werror=option-ignored CLANG_FLAGS += -Werror=unused-command-line-argument -KBUILD_CFLAGS += $(CLANG_FLAGS) -KBUILD_AFLAGS += $(CLANG_FLAGS) +KBUILD_CPPFLAGS += $(CLANG_FLAGS) export CLANG_FLAGS |