linux-kernel - Re: [PATCH v3 2/2] Makefile: infer CROSS_COMPILE from SRCARCH for CC=clang LLVM

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Message-ID: <CANiq72kya-9zeGN4uTqLMbAUMDGu-SQXRAwS9UTxceeObbN9yg@mail.gmail.com>
Date:   Fri, 30 Jul 2021 08:50:51 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Arnd Bergmann <arnd@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christoph Hellwig <hch@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 2/2] Makefile: infer CROSS_COMPILE from SRCARCH for
 CC=clang LLVM_IAS=1

On Fri, Jul 30, 2021 at 2:19 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> maximally flexible."  We don't want folks generally using CC=clang;
> preferably they'd use LLVM=1.  I need to rewrite our docs to make that
> more explicit and straightforward.  And if folks would prefer to use
> CC=clang for whatever reason, let them explicitly state CROSS_COMPILE
> then.

Perhaps it would be nice to clarify the "level of support" for
`CC=clang` too, in particular long-term when `LLVM=1` works for all
architectures.

In other words, is `CC=clang` going to remain supported/maintained, or
it will be something that will still compile/boot but not expected to
be used by anyone in production, or dropped altogether (not the `CC`
option itself, of course, I refer to the mix of toolchains)?

Thanks,

Cheers,
Miguel