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Using and Porting GNU Fortran

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9.7 Fortran 90

The GNU Fortran language includes a number of features that are part of Fortran 90, even when the `-ff90' option is not specified. The features enabled by `-ff90' are intended to be those that, when `-ff90' is not specified, would have another meaning to g77---usually meaning something invalid in the GNU Fortran language.

So, the purpose of `-ff90' is not to specify whether g77 is to gratuitously reject Fortran 90 constructs. The `-pedantic' option specified with `-fno-f90' is intended to do that, although its implementation is certainly incomplete at this point.

When `-ff90' is specified:

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