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Date: Fri, 20 Mar 2009 22:57:38 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
cc: Sam Ravnborg <sam@ravnborg.org>, LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH] kbuild: work around distcc/icecc madness
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On Fri, 20 Mar 2009, Peter Zijlstra wrote:
> > Changing from distcc to gcc will start a full rebuild on linus tree as
> > well.
> 
> I just tried:
> 
> root@twins:/mnt/build/linux-2.6# /mnt/md0/cross/bin/x86_64-linux-gcc --version
> x86_64-linux-gcc (GCC) 4.3.1 20080510 (prerelease)
> Copyright (C) 2008 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> root@twins:/mnt/build/linux-2.6# gcc --version
> gcc (Ubuntu 4.3.2-1ubuntu12) 4.3.2
> Copyright (C) 2008 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> The build with the distcc x86_64-linux-gcc compiler and the install
> using the host compiler works just fine on Linus' tree.

Hmm, I went through all the Makefile changes and we do not touch those
bits at all.

Can you check whether builddir/scripts/mod/.empty.o.cmd has
-DCONFIG_AS_CFI in the command line ?

Can you check that file after you built -tip (w/o my patch) and after
your make install started to rebuild the tree ?

Thanks,

	tglx