Cpplib document: Macro Expansion algorithm

[Gao, Jiafu]

Hi, 

I am working on a project which needs similar functionality like
the C/C++ macro expansion. I found the GNU GCC project has a
pretty good CPP library. Unfortunately, the document for macro
expansion algorithm part is empty. 

    http://gcc.gnu.org/onlinedocs/cppinternals_6.html#SEC6

I am wondering if this is left out unintentionally or intentionally? Is
it possible to get some help (either in formal/informal document, or
answering some questions) from the author? 

Thanks for your time.

Jiafu


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