linux-kernel - Re: [PATCH] x86: mostly disable '-maccumulate-outgoing-args'

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Message-ID: <20170316185305.lk4pi3a7b5n6uqjd@treble>
Date:   Thu, 16 Mar 2017 13:53:05 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     x86@...nel.org, Andy Lutomirski <luto@...capital.net>,
        Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Peter Anvin <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86: mostly disable '-maccumulate-outgoing-args'

On Thu, Mar 16, 2017 at 01:36:35PM -0500, Josh Poimboeuf wrote:
> On Thu, Mar 16, 2017 at 01:32:01PM -0400, Steven Rostedt wrote:
> > On Thu, 16 Mar 2017 10:42:08 -0500
> > Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > > +	ACCUMULATE_OUTGOING_ARGS := 1
> > > +    endif
> > > +  endif
> > > +endif
> > > +
> > > +# Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent
> > 
> > Can we make a test instead? I hate testing versions, and things get
> > backported all the time. We usually like to have a test case instead of
> > relying on versions. Not to mention, a newer gcc may one day break.
> 
> Tests are generally better, but I'm not sure how to test for this
> cleanly.  The test is rather big for embedding in a makefile:
> 
>   https://gcc.gnu.org/bugzilla/attachment.cgi?id=22199
> 
> Any ideas?

After some snooping I discovered there's some precedent for doing this
in the scripts/gcc-*.sh files.  So maybe I'll add a test there and call
it from the Makefile.

-- 
Josh