linux-kernel - Re: [patch 2.6.19-rc6] Stop gcc 4.1.0 optimizing wait_hpet

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Message-ID: <22166.1164950044@kao2.melbourne.sgi.com>
Date:	Fri, 01 Dec 2006 16:14:04 +1100
From:	Keith Owens <kaos@....com.au>
To:	Andrew Morton <akpm@...l.org>
cc:	Willy Tarreau <w@....eu>, Jakub Jelinek <jakub@...hat.com>,
	Nicholas Miell <nmiell@...cast.net>,
	linux-kernel@...r.kernel.org, davem@...emloft.net, ak@...e.de
Subject: Re: [patch 2.6.19-rc6] Stop gcc 4.1.0 optimizing wait_hpet_tick away 

Andrew Morton (on Thu, 30 Nov 2006 21:05:51 -0800) wrote:
>On Wed, 29 Nov 2006 21:14:10 +0100
>Willy Tarreau <w@....eu> wrote:
>
>> Then why not simply check for gcc 4.1.0 in compiler.h and refuse to build
>> with 4.1.0 if it's known to produce bad code ?
>
>Think so.  I'll queue this and see how many howls it causes.
>
>--- a/init/main.c~gcc-4-1-0-is-bust
>+++ a/init/main.c
>@@ -75,6 +75,10 @@
> #error Sorry, your GCC is too old. It builds incorrect kernels.
> #endif
> 
>+#if __GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ == 0
>+#error gcc-4.1.0 is known to miscompile the kernel.  Please use a different compiler version.
>+#endif
>+
> static int init(void *);
> 
> extern void init_IRQ(void);

SuSE's SLES10 ships with gcc 4.1.0.  There is nothing to stop a
distributor from backporting the bug fix from gcc 4.1.1 to 4.1.0, but
this patch would not allow the fixed compiler to build the kernel.

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