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

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Message-ID: <481B2BE6.3050708@goop.org>
Date:	Fri, 02 May 2008 07:57:42 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Alistair John Strachan <alistair@...zero.co.uk>,
	Chris Knadle <Chris.Knadle@...edump.us>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...nel.org>, venkatesh.pallipadi@...el.com,
	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,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: huge gcc 4.1.{0,1} __weak problem

Sam Ravnborg wrote:
> OK, can anyone confirm that this fails to build which a
> buggy gcc:
>
>
> void __attribute__((weak)) func(void)
> {
>     /* no code */
> }
>
> int main()
> {
>     func();
>     return 0;
> }
>   

I think the problem is that main() would have no call to func(), not 
that it wouldn't build.

Does making func noinline fix it?  I wonder if we should make __weak 
implicitly make the function noinline too.

    J
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