linux-kernel - Re: [2.6.27 patch] #error for gcc 4.1.{0,1}

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Message-Id: <20080813135749.b9985fcc.akpm@linux-foundation.org>
Date:	Wed, 13 Aug 2008 13:57:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [2.6.27 patch] #error for gcc 4.1.{0,1}

On Wed, 13 Aug 2008 23:44:45 +0300
Adrian Bunk <bunk@...nel.org> wrote:

> gcc 4.1.0 and 4.1.1 are known to miscompile the kernel:
>   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27781
> 
> Usage of weak functions has become a common pattern in the kernel, and 
> usages get added in each kernel version increasing the probability of 
> bugs with each kernel release.
> 
> This miscompilation of weak functions can result in subtle runtime 
> errors.
> 
> #error for gcc 4.1.0 and 4.1.1 to prevent users from running into
> this bug.
> 
> Note:
> We already printed a #warning for gcc 4.1.0 due to a different bug.

I've been hiding from this because it would wreck a lot of my
cross-compilers, which quite a few other people are using as well.

Vegard, save us!
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