[cfe-dev] Interact with clang's preprocessor

[Paolo Bolzoni]

dear cfe-list,

I would like to interface with the clang preprocessor in order to check
programming-style rules. For instance:

`Arguments to a function-like macro shall not contain tokens that look
like preprocessing directives.'

An example of violation.
------->
#define AB define
#define C A ## B
#define macro(X) X
int define;
int f() {
   return macro(C);
}
-------<

My own code (which checks the arguments' text) should be called:
   - *before* function-macro expansion, but
   - *after* the expansion of the arguments.

Is there a way to do this using the clang preprocessor (e.g., by
suitably registering my own code as a callback function)?

What is the simplest way to achieve this?

Thanks
pb