On Tue, Feb 25, 2025 at 7:00 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
>
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> The headercheck tries to call clang with a mix of compiler arguments
> that don't include the target architecture. When building e.g. x86
> headers on arm64, this produces a warning like
>
> clang: warning: unknown platform, assuming -mfloat-abi=soft
>
> Add in the KBUILD_CPPFLAGS, which contain the target, in order to make it
> build properly.
>
> See also 1b71c2fb04e7 ("kbuild: userprogs: fix bitsize and target
> detection on clang").
>
> Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> Fixes: feb843a469fb ("kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
Applied to linux-kbuild. Thanks.
> v2: use same approach as the other patch.
> v3: fix changelog text
> ---
> usr/include/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/usr/include/Makefile b/usr/include/Makefile
> index 58a9cbe4eba4..b9a2640b4bb7 100644
> --- a/usr/include/Makefile
> +++ b/usr/include/Makefile
> @@ -10,7 +10,7 @@ UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
>
> # In theory, we do not care -m32 or -m64 for header compile tests.
> # It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
> -UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
> +UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
>
> # USERCFLAGS might contain sysroot location for CC.
> UAPI_CFLAGS += $(USERCFLAGS)
> --
> 2.39.5
>
--
Best Regards
Masahiro Yamada
