linux-kernel - Re: Does anyone care about gcc 3.x support for x86 anymore?

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Message-ID: <4BF484D8.7090803@zytor.com>
Date:	Wed, 19 May 2010 17:39:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, suresh.b.siddha@...el.com,
	tglx@...utronix.de, avi@...hat.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: Does anyone care about gcc 3.x support for x86 anymore?

On 05/19/2010 04:10 PM, Mauro Carvalho Chehab wrote:
> H. Peter Anvin wrote:
>> Recently, we have seen an increasing number of problems with gcc 3.4 on
>> x86; mostly due to poor constant propagation producing not just bad code
>> but failing to properly eliminate what should be dead code.
> 
> I don't see any problem, as, if people are using gcc3, they are probably
> not interested on the bleeding edge kernel. 
> 
> However, if the problems are just performance/dead code removal, I would 
> just add a big warning if someone tries to compile x86 with it. I don't 
> like very much the idea of having different minimum gcc requirements 
> for each architecture, except if gcc is producing a broken code. 
> 
> Currently,Documentation/Changes list just a common minimal list for
> everything - although the text describing gcc say that the "version 
> requirements" may vary for each CPU type.
> 

We already have different gcc version requirements, whether or not
they're written down is another matter...

	-hpa

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