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Using and Porting GNU Fortran

15.3.25 Fortran Preprocessor

g77 should offer a preprocessor designed specifically for Fortran to replace `cpp -traditional'. There are several out there worth evaluating, at least.

Such a preprocessor would recognize Hollerith constants, properly parse comments and character constants, and so on. It might also recognize, process, and thus preprocess files included via the INCLUDE directive.