linux-kernel - Re: huge gcc 4.1.{0,1} _

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Message-ID: <20080501224956.GM2255@devserv.devel.redhat.com>
Date:	Thu, 1 May 2008 18:49:56 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	torvalds@...ux-foundation.org, bunk@...nel.org,
	davem@...emloft.net, trini@...nel.crashing.org, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
	suresh.b.siddha@...el.com
Subject: Re: huge gcc 4.1.{0,1} __weak problem

On Thu, May 01, 2008 at 03:42:38PM -0700, Andrew Morton wrote:
> Is there some vaguely maintainable workaround we can do?  If the problem
> only affects completely-empty weak functions then we could put something in
> them to make them non-empty?

for (;;); isn't enough, the function would be still considered const and by
4.1.0 and some 4.1.1 incorrectly optimized out, without regard to weak
attribute.
But e.g.
asm ("");
should be enough.

	Jakub
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