Re: [patch 2.6.19-rc6] Stop gcc 4.1.0 optimizing wait_hpet_tickaway

[Andrew Morton]

On Wed, 29 Nov 2006 21:14:10 +0100
Willy Tarreau <w@xxxxxx> 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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