Writing a standalone c preprocessor (like the old cpp) using the cpplib

[Andre-Marcel Hellmund]

Hey Oli,
> for a project I need a standalone c preprocessor and I was thinking about using
> the cpplib from the latest gcc-core 4.6 snapshot
> as the base library. Could maybe anyone please post a very brief guide on how to
> start and what files I have to look at. I am quite a beginner
> and kinda lost without some help. My idea is to write a frontend that reads in
> the files, include paths and the defines, then calls the libcpp to do
> the preprocessing and afterwards writes out the preprocessed files.
>    
Sorry for the question, but why do you want to (re)write the C 
preprocessor yourself? Although the preprocessor logic (libcpp.a) is 
integrated into the C compiler (cc1) in the meantime, there is still a 
stand-alone C preprocessr (cpp) which you could use for your purpose. Or 
is there any special requirement in your project to NOT use the shipped 
'cpp'?

Best regards,
Andi