kbuild: specify absolute paths for cscope
Cscope doesn't hadle relative paths when cscope.out is not in $PWD. Use absolute paths when generating cscope.files, which seems to be the recommended way to generate cscope.out, anyway (at least according to cscope.sf.net). The speed and size differences are minimal, the only drawback is that the database needs to be regenerated if the source directory is moved. [mmarek: fixed for O= builds, modified changelog] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NMichal Marek <mmarek@suse.cz>
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