I'm not convinced that is enough. You need to make the individual
xdiff/*.c files depend on the xdiff/*.h files, because otherwise it will
think that the *.o files are up-to-date and just re-link the archive.
The kernel does automatic dependency generation for all the *.c files, and
it's _really_ nice. Having to do dependencies by hand is just always going
to suck. But the kernel can depend on more things (in particular, the
kernel can depend on gcc, and use things like "-MD,$(depfile)" to generate
lists of dependencies while building, so that any object file _always_ has
the things it depended upn explicitly listed).
But in the absense of those kinds of really clever and powerful tricks, it
might be worthwhile to even just have a "mkdepend" scrupt thing and
include the end result into the Makefile (we do already depend on GNU
make).
That would allow us to get the real dependencies (and minimal! right now
we sometimes compile too _much_ just because some of our dependencies are
so screwed up and lazy).
Linus
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