-I option expansion and -Wmissing-include-dirs

["Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>]

Hi,

Currently, kbuild makes -I option expansion without any check if the
resulting include directory exists. It produce warnings if you try to build
with W=1 which enables -Wmissing-include-dirs. For example:

$ make W=1 O=~/var/tmp drivers/gpu/drm/drm_auth.o
  Using /home/space/kas/git/public/linux as source for kernel
  GEN     /home/space/kas/var/tmp1/Makefile
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    /home/space/kas/git/public/linux/scripts/checksyscalls.sh
  CC [M]  drivers/gpu/drm/drm_auth.o
cc1: warning: include/drm: No such file or directory [enabled by default]

It would be nice to address the issue.

P.S. [enabled by default] is gcc bug. [-Wmissing-include-dirs] should be there.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51303

-- 
 Kirill A. Shutemov
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