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References: <20230606-fix-as-option-after-clang_flags-move-v1-1-a7f7b23a35e3@kernel.org>
In-Reply-To: <20230606-fix-as-option-after-clang_flags-move-v1-1-a7f7b23a35e3@kernel.org>
From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Wed, 7 Jun 2023 22:39:38 +0900
Message-ID: <CAK7LNARAnyYo-Xdx9c528=Pw7cVbt1peWTTCu6LQkLmeMsp+hA@mail.gmail.com>
Subject: Re: [PATCH] kbuild: Add KBUILD_CPPFLAGS to as-option invocation
To:     Nathan Chancellor <nathan@kernel.org>
Cc:     naresh.kamboju@linaro.org, ndesaulniers@google.com,
        nicolas@fjasle.eu, trix@redhat.com, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
        patches@lists.linux.dev,
        Linux Kernel Functional Testing <lkft@linaro.org>
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On Wed, Jun 7, 2023 at 7:40=E2=80=AFAM Nathan Chancellor <nathan@kernel.org=
> wrote:
>
> After commit feb843a469fb ("kbuild: add $(CLANG_FLAGS) to
> KBUILD_CPPFLAGS"), there is an error while building certain PowerPC
> assembly files with clang:
>
>   arch/powerpc/lib/copypage_power7.S: Assembler messages:
>   arch/powerpc/lib/copypage_power7.S:34: Error: junk at end of line: `0b0=
1000'
>   arch/powerpc/lib/copypage_power7.S:35: Error: junk at end of line: `0b0=
1010'
>   arch/powerpc/lib/copypage_power7.S:37: Error: junk at end of line: `0b0=
1000'
>   arch/powerpc/lib/copypage_power7.S:38: Error: junk at end of line: `0b0=
1010'
>   arch/powerpc/lib/copypage_power7.S:40: Error: junk at end of line: `0b0=
1010'
>   clang: error: assembler command failed with exit code 1 (use -v to see =
invocation)
>
> as-option only uses KBUILD_AFLAGS, so after removing CLANG_FLAGS from
> KBUILD_AFLAGS, there is no more '--target=3D' or '--prefix=3D' flags. As =
a
> result of those missing flags, the host target
> will be tested during as-option calls and likely fail, meaning necessary
> flags may not get added when building assembly files, resulting in
> errors like seen above.
>
> Add KBUILD_CPPFLAGS to as-option invocations to clear up the errors.
> This should have been done in commit d5c8d6e0fa61 ("kbuild: Update
> assembler calls to use proper flags and language target"), which
> switched from using the assembler target to the assembler-with-cpp
> target, so flags that affect preprocessing are passed along in all
> relevant tests. as-option now mirrors cc-option.
>
> Fixes: feb843a469fb ("kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS")
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> Closes: https://lore.kernel.org/CA+G9fYs=3DkoW9WardsTtora+nMgLR3raHz-LSLr=
58tgX4T5Mxag@mail.gmail.com/
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>
> ---

Applied to linux-kbuild.
Thanks.


>  scripts/Makefile.compiler | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
> index 437013f8def3..e31f18625fcf 100644
> --- a/scripts/Makefile.compiler
> +++ b/scripts/Makefile.compiler
> @@ -32,7 +32,7 @@ try-run =3D $(shell set -e;             \
>  # Usage: aflags-y +=3D $(call as-option,-Wa$(comma)-isa=3Dfoo,)
>
>  as-option =3D $(call try-run,\
> -       $(CC) -Werror $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev=
/null -o "$$TMP",$(1),$(2))
> +       $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x asse=
mbler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
>
>  # as-instr
>  # Usage: aflags-y +=3D $(call as-instr,instr,option1,option2)
>
> ---
> base-commit: feb843a469fb0ab00d2d23cfb9bcc379791011bb
> change-id: 20230606-fix-as-option-after-clang_flags-move-be88e993cbaa
>
> Best regards,
> --
> Nathan Chancellor <nathan@kernel.org>
>


--=20
Best Regards
Masahiro Yamada