kbuild: problems with separate src/obj trees

kbuild: problems with separate src/obj trees

[Gerd Hoffmann]

  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?

  Gerd

-- 
Gerd 'just married' Hoffmann <kraxel@suse.de>
I'm the hacker formerly known as Gerd Knorr.
http://www.suse.de/~kraxel/just-married.jpeg

Re: kbuild: problems with separate src/obj trees

[Kalin KOZHUHAROV]

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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Re: kbuild: problems with separate src/obj trees

[Gerd Hoffmann]

>> 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

> 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

Ok, the .kernelrelease issue is fixed meanwhile, I still see the UML
build failure though.  That triggers also without "make -j", so it is
probably a different bug ...

cheers,

  Gerd

-- 
Gerd 'just married' Hoffmann <kraxel@suse.de>
I'm the hacker formerly known as Gerd Knorr.
http://www.suse.de/~kraxel/just-married.jpeg