linux-kernel - Re: fyi: gcc33-hammer crashes when compiling kvm emulate.c

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Message-ID: <4CC71B94.2010802@zytor.com>
Date:	Tue, 26 Oct 2010 11:19:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	kvm@...r.kernel.org, avi@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: fyi: gcc33-hammer crashes when compiling kvm emulate.c

On 10/26/2010 10:01 AM, Andi Kleen wrote:
>> Not unless they are actively known to break.  People get huffy about it
> 
> Well they do -- i just found out.

Sounds like a good reason to put in a warning or error.

>> because even if it is known to have problems it doesn't break *their*
>> particular configuration.  I'm getting to be of the opinion that people
>> who compile modern kernels with ancient compilers and expect it to work
>> are suffering from some particular kind of insanity -- it's nothing the
>> distros do.  The only exception are embedded people who compile with the
>> latest 3.4 gcc; they have explained they do so because newer gccs have
>> too many dependencies (the actual compiler, not the generated code) and
>> for speed.
> 
> At least in the old days the main reason for gcc 3 was build speed.
> AKPM and some others used to be fond of that.
> 
> 3.x is apparently much faster than 4.x

That is an issue too, as 3.x does a lot fewer optimizations than 4.x.

	-hpa
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