linux-kernel - Re: Use (two) different compilers at build-time?

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Message-ID: <CA+55aFyBS1wzADgKGfOtC8MR9QaQWimBH0EQUqSxYxpKS6ZH-Q@mail.gmail.com>
Date:	Mon, 7 Sep 2015 13:15:13 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Use (two) different compilers at build-time?

On Mon, Sep 7, 2015 at 12:12 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> is it possible to use a different compiler at build-time?
>
> I have here a problem with mm/percpu.c and wanted to build everything
> with LLVM/Clang but this single file with GCC.
>
> Is that possible?

It should work fine. It's occasionally how people bisect compiler bugs
in the kernel (although then it's usually just two different versions
of the same compiler), and I think people have done that with llvm
too. After all, llvm object files link to gcc-produced object files in
user space (ie libraries are most often compiled with different
compilers).

So no _guarantees_ (especially since the kernel sometimes does odd
things), but there's no overwhelming reason it shouldn't work, and
there are several reasons it should be fine.

                  Linus
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