linux-kernel - Re: [PATCH] kbuild: compile_h: fix compiler version detection with clang

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Message-ID: <CAK7LNAQKz9Cu2aPxM2xo22Y_1b2+E1NQibi0ZgLRyGr5+ZLWoQ@mail.gmail.com>
Date:   Fri, 15 May 2020 09:42:09 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Yuxuan Shui <yshuiv7@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] kbuild: compile_h: fix compiler version detection with clang

On Fri, May 15, 2020 at 7:43 AM Yuxuan Shui <yshuiv7@...il.com> wrote:
>
>
> In some setup clang will print a line about CUDA version it detects,
> like this:
>
>     Found CUDA installation: /opt/cuda, version 10.1
>
> So grepping ' version ' matches 2 lines, and results in a broken string in
> compiler.h, which doesn't compile.
>
> This commit adds a "head -n1" to fix this problem.
>
> Signed-off-by: Yuxuan Shui <yshuiv7@...il.com>


I do not know what to do about this.


This problem had already been fixed by a different
patch, which is queued up in linux-next.

9a950154668729a472d17b8e307d92e7c60f45f7

This patch
https://patchwork.kernel.org/patch/11505803/

So, the future releases will be OK.


For back-porting to the stable kernel,
your one-liner fixup is simpler.




> ---
>  scripts/mkcompile_h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h
> index 5b80a4699740..8e6b4fc6fdd9 100755
> --- a/scripts/mkcompile_h
> +++ b/scripts/mkcompile_h
> @@ -62,7 +62,7 @@ UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"
>    printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
>    echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
>
> -  CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//')
> +  CC_VERSION=$($CC -v 2>&1 | grep ' version ' | head -n1 | sed 's/[[:space:]]*$//')
>    LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
>                       | sed 's/[[:space:]]*$//')
>    printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
> --
> 2.26.2



--
Best Regards
Masahiro Yamada