From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 24 Oct 2008 08:17:53 -0700 (PDT)

quoted text
> Now, _another_ part (and arguably the really core reason) of this problem 
> is that our Makefile rules for the asm include directory is weak and 
> unreliable in the presense of already-existing unexpected entries.

I guess we could use seperate "stamp" files to deal with this.

Along with the generated file "foo" there is a "foo.stamp" file
that is generated with "touch" after "foo" is built.

Then "foo"'s update rule is whether the "foo.stamp" is out of date
wrt. it's dependencies.
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