Link to compiler?

I'm doing experiments with an interpreter in C with Bison and Flex .
It parses external files ok (opening them), but the problem is
that I would like, the C compiler would call the parser
when it encounters the "alien" words, allowing me to use them
inside a normal C source, instead of complaining that they aren't correct!
How this could done?
[Write a preprocessor that reads files with your language and C intermixed,
translate your stuff into the equivalent C, usually a bunch of procedure
calls, and give the resulting C code to the C compiler. -John]

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