Beginner GCC projects question

[Paolo Bonzini]

See, the solution to the crossbuild problem (and to the "non-GCC
bootstrap compiler" problem) is to build cpplib for the build machine,
and wrap a custom tool around it.  That part is easy.  But once
you've done that, why not make the custom tool a little cleverer so
that it can generate _all_ the dependencies?  I don't think it's
hard.
You already have such a tool.  It's mostly cpp | awk.

Paolo