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Subroutines with alternate returns (e.g. `SUBROUTINE X(*)' and
`CALL X(*50)') are implemented by g77 as functions returning
the C int type.
The actual alternate-return arguments are omitted from the calling sequence.
Instead, the caller uses
the return value to do a rough equivalent of the Fortran
computed-GOTO statement, as in `GOTO (50), X()' in the
example above (where `X' is quietly declared as an INTEGER(KIND=1)
function), and the callee just returns whatever integer
is specified in the RETURN statement for the subroutine
For example, `RETURN 1' is implemented as `X = 1' followed
by `RETURN'
in C, and `RETURN' by itself is `X = 0' and `RETURN').