linux-kernel - Re: BUG: GCC-4.4.x changes the function frame on some functions

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Date:	Thu, 19 Nov 2009 10:43:41 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrew Haley <aph@...hat.com>
cc:	Richard Guenther <richard.guenther@...il.com>, rostedt@...dmis.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	feng.tang@...el.com, Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, jakub@...hat.com,
	gcc@....gnu.org
Subject: Re: BUG: GCC-4.4.x changes the function frame on some functions



On Thu, 19 Nov 2009, Linus Torvalds wrote:
> 
> Oh Gods, are we back to gcc people saying "sure, we do stupid things, but 
> it's allowed, so we don't consider it a bug because it doesn't matter that 
> real people care about real life, we only care about some paper, and real 
> life doesn't matter, if it's 'undefined' we can make our idiotic choices 
> regardless of what people need, and regardless of whether it actually 
> generates better code or not".

Put another way: the stack alignment itself may not be a bug, but gcc 
generating God-awful code for the mcount handling that results in problems 
in real life sure as hell is *stupid* enough to be called a bug.

I bet other people than just the kernel use the mcount hook for subtler 
things than just doing profiles. And even if they don't, the quoted code 
generation is just crazy _crap_.

		Linus
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