[PATCH] kbuild: Add ability to test Clang's integrated assembler

[PATCH] kbuild: Add ability to test Clang's integrated assembler

[Nathan Chancellor]

There are some people interested in experimenting with Clang's
integrated assembler. To make it easy to do so without source
modification, allow the user to specify 'AS=clang' as part of the
make command to avoid adding '-no-integrated-as' to the {A,C}FLAGS.

Link: https://github.com/ClangBuiltLinux/linux/issues/577
Suggested-by: Dmitry Golovin <dima@golovin.in>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 5102b2bbd224..d77481129339 100644
--- a/Makefile
+++ b/Makefile
@@ -527,7 +527,9 @@ endif
 ifneq ($(GCC_TOOLCHAIN),)
 CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
+ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
 CLANG_FLAGS	+= -no-integrated-as
+endif
 CLANG_FLAGS	+= -Werror=unknown-warning-option
 KBUILD_CFLAGS	+= $(CLANG_FLAGS)
 KBUILD_AFLAGS	+= $(CLANG_FLAGS)
-- 
2.22.0

Re: [PATCH] kbuild: Add ability to test Clang's integrated assembler

[Nick Desaulniers]

On Thu, Jun 27, 2019 at 12:15 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> There are some people interested in experimenting with Clang's
> integrated assembler. To make it easy to do so without source
> modification, allow the user to specify 'AS=clang' as part of the
> make command to avoid adding '-no-integrated-as' to the {A,C}FLAGS.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/577
> Suggested-by: Dmitry Golovin <dima@golovin.in>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> ---
>  Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 5102b2bbd224..d77481129339 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -527,7 +527,9 @@ endif
>  ifneq ($(GCC_TOOLCHAIN),)
>  CLANG_FLAGS    += --gcc-toolchain=$(GCC_TOOLCHAIN)
>  endif
> +ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
>  CLANG_FLAGS    += -no-integrated-as
> +endif

This is a nice suggestion and solution.  Thanks Dima and Nathan.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
-- 
Thanks,
~Nick Desaulniers

Re: [PATCH] kbuild: Add ability to test Clang's integrated assembler

[Masahiro Yamada]

On Fri, Jun 28, 2019 at 4:15 AM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> There are some people interested in experimenting with Clang's
> integrated assembler. To make it easy to do so without source
> modification, allow the user to specify 'AS=clang' as part of the
> make command to avoid adding '-no-integrated-as' to the {A,C}FLAGS.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/577
> Suggested-by: Dmitry Golovin <dima@golovin.in>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Applied to linux-kbuild. Thanks.



> ---
>  Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 5102b2bbd224..d77481129339 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -527,7 +527,9 @@ endif
>  ifneq ($(GCC_TOOLCHAIN),)
>  CLANG_FLAGS    += --gcc-toolchain=$(GCC_TOOLCHAIN)
>  endif
> +ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
>  CLANG_FLAGS    += -no-integrated-as
> +endif
>  CLANG_FLAGS    += -Werror=unknown-warning-option
>  KBUILD_CFLAGS  += $(CLANG_FLAGS)
>  KBUILD_AFLAGS  += $(CLANG_FLAGS)
> --
> 2.22.0
>


--
Best Regards
Masahiro Yamada