kbuild: problems with separate src/obj trees

[Gerd Hoffmann <kraxel@suse.de>]

  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
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