From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: fyi: gcc33-hammer crashes when compiling kvm emulate.c Date: Tue, 26 Oct 2010 11:19:00 -0700 Message-ID: <4CC71B94.2010802@zytor.com> References: <20101026123828.GA30434@basil.fritz.box> <4CC70333.80400@zytor.com> <20101026163748.GB29961@basil.fritz.box> <4CC705ED.1020105@zytor.com> <20101026170142.GD29961@basil.fritz.box> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, avi@redhat.com, linux-kernel@vger.kernel.org To: Andi Kleen Return-path: In-Reply-To: <20101026170142.GD29961@basil.fritz.box> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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