linux-kernel - Re: [PATCH v2 01/39] kbuild: Fix clang build

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Message-ID: <202203011636.40D2F83@keescook>
Date:   Tue, 1 Mar 2022 16:47:36 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        joao@...rdrivepizza.com, hjl.tools@...il.com, jpoimboe@...hat.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v2 01/39] kbuild: Fix clang build

On Tue, Mar 01, 2022 at 01:16:04PM -0800, Nick Desaulniers wrote:
> Also, Kees mentions this is an issue for testing multiple different
> versions of gcc, too.  There perhaps is a way to simplify the builds
> for BOTH toolchains; i.e. a yet-to-be-created shared variable denoting
> the suffix for binaries?  The primary pain point seems to be Debian's
> suffixing scheme; it will suffix GCC, clang, and lld, but not GNU
> binutils IIUC.

Right. Though I think auto-detection still makes sense.

If I do:

	make CC=clang-12 LLVM=1

it'd be nice if it also used ld.lld-12.

> [...]
> Just curious, what prefixes have you observed in the wild?

For me, where ever I built clang, and "/usr/bin"

-- 
Kees Cook