Q: I've got this tricky preprocessing I want to do and I can't figure out a way to do it.
A: C's preprocessor is not intended as a general-purpose tool. (Note also that it is not guaranteed to be available as a separate program.) Rather than forcing it to do something inappropriate, you might want to write your own little special-purpose preprocessing tool, instead. You can easily get a utility like make(1) to run it for you automatically.
If you are trying to preprocess something other than C, consider using a general-purpose preprocessor. (One older one available on most Unix systems is m4.)
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