linux-kernel - Re: [PATCH 2/2] kbuild: check the minimum linker version in Kconfig

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Date:   Mon, 22 Feb 2021 02:10:57 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     David Laight <david.laight@...lab.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Johannes Weiner <hannes@...xchg.org>,
        KP Singh <kpsingh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nick Terrell <terrelln@...com>,
        Quentin Perret <qperret@...gle.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Valentin Schneider <valentin.schneider@....com>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] kbuild: check the minimum linker version in Kconfig

On Tue, Feb 16, 2021 at 12:11 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Unify the two scripts/ld-version.sh and scripts/lld-version.sh, and
> check the minimum linker version like scripts/cc-version.sh did.
>
> I tested this script for some corner cases reported in the past:
>
>  - GNU ld version 2.25-15.fc23
>    as reported by commit 8083013fc320 ("ld-version: Fix it on Fedora")
>
>  - GNU ld (GNU Binutils) 2.20.1.20100303
>    as reported by commit 0d61ed17dd30 ("ld-version: Drop the 4th and
>    5th version components")
>
> This script show an error message if the linker is too old:
>
>   $ make LD=ld.lld-9
>     SYNC    include/config/auto.conf
>   ***
>   *** Linker is too old.
>   ***   Your LLD version:    9.0.1
>   ***   Minimum LLD version: 10.0.1
>   ***
>   scripts/Kconfig.include:50: Sorry, this linker is not supported.
>   make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
>   make[1]: *** [Makefile:600: syncconfig] Error 2
>   make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> I also moved the check for gold to this script, so gold is still rejected:
>
>   $ make LD=gold
>     SYNC    include/config/auto.conf
>   gold linker is not supported as it is not capable of linking the kernel proper.
>   scripts/Kconfig.include:50: Sorry, this linker is not supported.
>   make[2]: *** [scripts/kconfig/Makefile:71: syncconfig] Error 1
>   make[1]: *** [Makefile:600: syncconfig] Error 2
>   make: *** [Makefile:708: include/config/auto.conf] Error 2
>
> Thanks to David Laight for suggesting shell script improvements.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>

Applied to linux-kbuild.


-- 
Best Regards
Masahiro Yamada