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

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Date:	Thu, 30 Nov 2006 21:05:51 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Willy Tarreau <w@....eu>
Cc:	Jakub Jelinek <jakub@...hat.com>, Keith Owens <kaos@....com.au>,
	Nicholas Miell <nmiell@...cast.net>,
	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: Re: [patch 2.6.19-rc6] Stop gcc 4.1.0 optimizing wait_hpet_tick
 away

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);
_

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