Fun Extending the C Preprocessor

Has anyone tried to extend the C Preprocessor to be a fully turing complete language (perhaps something like Snobol) to allow for Terra like meta-programming?

(I am not talking about metalang99 or Cello like stuff, which exploits the Turing tarpit of the currently specified preprocessor but rather tasteful additions to the preprocessor itself).

There are a couple of constructs that you end up re-creating as soon as you need non-trivial preprocessing.

One of those is the two-stage CAT, another one is the NARG the article talks about.

__COUNTER__ is going to be added to C29, the next version of the standard, maybe there's hope for __VA_COUNT__ and __CAT__ too!

You don't need to extend the preprocessor to have MAP: https://github.com/swansontec/map-macro

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