Neither a Language Switch Nor a File Extension

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If gpre finds neither a language extension nor a filename extension, it looks for a file in the following order:

1. filename.e (C)
2. filename.epas (Pascal)
3. filename.ef (FORTRAN)
4. filename.ecob (COBOL)
5. filename.ea (VERDIX Ada)
6. filename.eada (Alsys, and Telesoft Ada)

If gpre finds such a file, it generates an output file with the appropriate extension. If gpre does not find the file, it returns the following error:

gpre: can’t find filename with any known extension. Giving up.