NAG Fortran Compiler, Release 7.2: <CODE>fpp</CODE> diagnostics

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## 4.7 `fpp` diagnostics

There are three kinds of diagnostic messages:

- warnings. preprocessing of source code is continued and the return value remains to be 0.
- errors. Fpp continues preprocessing but sets the return code to a nonzero value, namely the number of errors.
- fatal error. Fpp cancels preprocessing and returns a nonzero return value.

The messages produced by fpp are intended to be self-explanatory. The line number and filename where the error occurred are printed along with the diagnostic.