linux-kernel - Re: [PATCH v2] Documentation: add minimum clang/llvm version

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Date:   Fri, 28 Aug 2020 03:24:49 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Theodore Ts'o" <tytso@....edu>, Borislav Petkov <bp@...e.de>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Will Deacon <will@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Documentation: add minimum clang/llvm version

On Thu, Aug 27, 2020 at 4:16 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> Based on a vote at the LLVM BoF at Plumbers 2020, we decided to start
> small, supporting just one formal upstream release of LLVM for now.
>
> We can probably widen the support window of supported versions over
> time.  Also, note that LLVM's release process is different than GCC's.
> GCC tends to have 1 major release per year while releasing minor updates
> to the past 3 major versions.  LLVM tends to support one major release
> and one minor release every six months.
>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
> Tested-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Tested-by: Nathan Chancellor <natechancellor@...il.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
> Changes V1 -> V2:
> * fix typo, as per Will.
> * add link to getting LLVM, as per Nathan.
> * collect tags.
>
>  Documentation/kbuild/llvm.rst     |  4 ++++
>  Documentation/process/changes.rst | 15 +++++++++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
> index 2aac50b97921..3f10a9c47551 100644
> --- a/Documentation/kbuild/llvm.rst
> +++ b/Documentation/kbuild/llvm.rst
> @@ -1,3 +1,5 @@
> +.. _kbuild_llvm:
> +
>  ==============================
>  Building Linux with Clang/LLVM
>  ==============================
> @@ -73,6 +75,8 @@ Getting Help
>  - `Wiki <https://github.com/ClangBuiltLinux/linux/wiki>`_
>  - `Beginner Bugs <https://github.com/ClangBuiltLinux/linux/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22>`_
>
> +.. _getting_llvm:
> +
>  Getting LLVM
>  -------------
>
> diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
> index ee741763a3fc..dac17711dc11 100644
> --- a/Documentation/process/changes.rst
> +++ b/Documentation/process/changes.rst
> @@ -30,6 +30,7 @@ you probably needn't concern yourself with pcmciautils.
>          Program        Minimal version       Command to check the version
>  ====================== ===============  ========================================
>  GNU C                  4.9              gcc --version
> +Clang/LLVM (optional)  10.0.1           clang --version


Just playing a nitpick:
Supporting Clang makes GCC optional, so now
"GNU C (optional)"

:-)


Reviewed-by: Masahiro Yamada <masahiroy@...nel.org>


--
Best Regards
Masahiro Yamada