Layman question: say you have a C codebase with a bunch of preprocessor macros and you want to get rid of a particular one that's too clever, and assume no other macros depend on it.

Is it possible to command the preprocessor to take the source files as input and print them out with that one particular macro expanded and no other changes?

Intuitively, it sounds like it should be possible, and then you'd end up with a code base with a bunch of repetition but one fewer too-clever abstraction - and refactoring to deal with repetition (if necessary!) is a far more approachable and well-understood problem.

(Kind of like how some fancy compiles-to-javascript languages have a literal 'mytool --escape' command that will turn the entire code base into a plain, non-minified javascript in case you ever want to stop using them.)