[Boost-users] [wave] dependency tracking #include

Hi all - Image that I might be a masochist, and want to write my own cross-platform build system. I'd want to track dependencies and only rebuild the object files that have modified dependencies. Of course, I could write my own header parser, and manually track #defines and #includes and follow files, etc... but my thought was that a preprocessor already does all of this work. How hard would it be to tap wave for this kind of information? Am I barking up the wrong tree? Is there some other solution that would be better? Thanks, Brian