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

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Message-ID: <20100519071357.GB9618@elte.hu>
Date:	Wed, 19 May 2010 09:13:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	eric.dumazet@...il.com,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Avi Kivity <avi@...hat.com>
Subject: Re: Does anyone care about gcc 3.x support for *x86* anymore?


(reposted with Andrew and Linus Cc:-ed too)

* H. Peter Anvin <hpa@...or.com> wrote:

> [Reposting as a separate thread]
> 
> 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'm wondering if there is any remaining real use of gcc 
> 3.4 on x86 for compiling current kernels (as opposed to 
> residual use for compiling applications on old 
> enterprise distros.)  I'm specifically not referring to 
> other architectures here -- most of these issues have 
> been in relation to low-level arch-specific code, and as 
> such only affects the x86 architectures.  Other 
> architectures may very well have a much stronger need 
> for continued support of an older toolchain.
> 
> If there isn't a reason to preserve support, I would 
> like to consider discontinue support for using gcc 3 to 
> compile x86 kernels.  If there is a valid use case, it 
> would be good to know what it is.
> 
> 	-hpa
> 
> -- 
> H. Peter Anvin, Intel Open Source Technology Center
> I work for Intel.  I don't speak on their behalf.
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