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Using and Porting GNU Fortran

8.12 Scope and Classes of Symbolic Names

(The following information augments or overrides the information in Chapter 18 of ANSI X3.9-1978 FORTRAN 77 in specifying the GNU Fortran language. Chapter 18 of that document otherwise serves as the basis for the relevant aspects of GNU Fortran.)

8.12.1 Underscores in Symbol Names