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GNU Info (g77-295.info)Fortran 90Fortran 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: * The type of `REAL(EXPR)' and `AIMAG(EXPR)', where EXPR is `COMPLEX' type, is the same type as the real part of EXPR. For example, assuming `Z' is type `COMPLEX(KIND=2)', `REAL(Z)' would return a value of type `REAL(KIND=2)', not of type `REAL(KIND=1)', since `-ff90' is specified. |