linux-kernel - Re: [PATCH v2 1/2] kbuild: fix CONFIG_CC_CAN_LINK(

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Date:   Tue, 30 Jun 2020 14:14:07 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH v2 1/2] kbuild: fix CONFIG_CC_CAN_LINK(_STATIC) for
 cross-compilation with Clang

On Wed, Jul 01, 2020 at 12:06:24AM +0900, Masahiro Yamada wrote:
> scripts/cc-can-link.sh tests if the compiler can link userspace
> programs.
> 
> When $(CC) is GCC, it is checked against the target architecture
> because the toolchain prefix is specified as a part of $(CC).
> 
> When $(CC) is Clang, it is checked against the host architecture
> because --target option is missing.
> 
> Pass $(CLANG_FLAGS) to scripts/cc-can-link.sh to evaluate the link
> capability for the target architecture.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
> 
> Changes in v2:
>   - New patch
> 
>  init/Kconfig | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index a46aa8f3174d..d0313e7725fa 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -49,13 +49,13 @@ config CLANG_VERSION
>  
>  config CC_CAN_LINK
>  	bool
> -	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(m64-flag)) if 64BIT
> -	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(m32-flag))
> +	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m64-flag)) if 64BIT
> +	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m32-flag))
>  
>  config CC_CAN_LINK_STATIC
>  	bool
> -	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) -static $(m64-flag)) if 64BIT
> -	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) -static $(m32-flag))
> +	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) -static $(m64-flag)) if 64BIT
> +	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) -static $(m32-flag))
>  
>  config CC_HAS_ASM_GOTO
>  	def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
> -- 
> 2.25.1
>