To: linux-kernel@vger.kernel.org
From: Kalin KOZHUHAROV <kalin@thinrope.net>
Subject: Re: kbuild: problems with separate src/obj trees
Date: Tue, 24 Jan 2006 00:15:04 +0900
Message-ID: <dr2rtq$c4$1@sea.gmane.org>
References: <43D4D708.2050802@suse.de>
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Gerd Hoffmann wrote:
>   Hi,
> 
> Trapped into two problems with 2.6.16-rc1:
> 
>   (1) Building kernels with the source tree on a r/o filesystem
>       doesn't work any more because kbuild tries to create
>       $(srctree)/.kernelrelease and fails to do so.
> 
>   (2) UML kernels don't build at all with a separate obj tree:
> 
> master-xen kraxel ~/objtree/vanilla-2.6.16-pre-um# make ARCH=um
> gmake -C /home/kraxel/scratch/vanilla-2.6.16-pre
> O=/home/kraxel/objtree/vanilla-2.6.16-pre-um
>   SYMLINK arch/um/include/kern_constants.h
> ln: creating symbolic link `arch/um/include/kern_constants.h' to
> `../../../include/asm-um/asm-offsets.h': No such file or directory
> gmake[2]: *** [arch/um/include/kern_constants.h] Error 1
> gmake[1]: *** [cdbuilddir] Error 2
> gmake: *** [all] Error 2
> 
> Ideas/Patches anyone?

There was a recen thread about these... let me see:
Look for "[PATCH 2/2] kbuild: fix make -jN with multiple targets with make
O=..." from Sam Ravnborg on 2006-01-16

[It is pushed out at:
git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild.git]

Kalin.

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