> Coding a special case to work out if the existing global makefile can
> be reused is horribly error prone. And it would take just as long as
> rebuilding the global makefile from scratch.
I seriously doubt that last statement. Building the global makefile
takes about 20 seconds on the box I compile on. On a kernel tree
without object files I can read all the files in the kernel tree in
about 0.8 seconds, and I can calculate an md5sum of every file in 3.2
seconds. I can do an md5sum of all the Makefile.in's in 0.1 seconds.
This is with pp_makefile* compiled with -O2 -DNDEBUG=1.
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