linux-kernel - Re: [PATCH 2/6] x86: bug: prevent gcc distortions

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Message-ID: <C481FBCA-2FA6-49B6-84DC-83FF03F539B9@vmware.com>
Date:   Fri, 18 May 2018 19:18:09 +0000
From:   Nadav Amit <namit@...are.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Peter Anvin <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 2/6] x86: bug: prevent gcc distortions

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Fri, May 18, 2018 at 12:02 PM Nadav Amit <namit@...are.com> wrote:
> 
>> I can add a -Wa,[filename.s] switch. It works, but sort of undocumented.
> 
> Oh, if it assembles things together, then that sounds optimal.
> 
> And yes, like hpa says, we should make sure that behavior is acknowledged
> by the GNU as people, so that they then don't come back and say "hey, now
> we assemble things as separate units".
> 
> That said, the "separate units" model really doesn't make much sense now
> that I think about it, because 'as' supports only one output file. So I
> guess the as people wouldn't have any issues with just accepting the
> "concatenate all input files" syntax.

Gnu ASM manual says: "Each time you run as it assembles exactly one source
program. The source program is made up of one or more files.”