kbuild: Unnecessary recompiles on path change

[Jan Engelhardt]

Hi,


I notice that my kernels get needlessy recompiled if I access the source 
tree through a different directory. In other words, /lo/linux is the 
kernel tree, and `mount --bind /lo /home/jengelh/lo` is in effect.

I see the absolute path being stored in .*.o.cmd files, which seems like 
all the explanation I need. I do remember that I left a comment 
when something like that was afloating:
http://www.nabble.com/-RFC-PATCH-3-6--kbuild:-convert-include-and-source-paths-td17064364.html

As of v2.6.27-rc4-263-g5697a99, there's no gcov in (at least there is no 
such thing in my .config when bulit with ARCH=um), but the issue with 
absolute paths exists.


Jan
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