[Bug fortran/56226] New: Add support for DEC UNION and MAP extensions

[russelljbrennan at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56226

             Bug #: 56226
           Summary: Add support for DEC UNION and MAP extensions
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: russelljbrennan@gmail.com


Porting old f77 code for use with gfortran is fairly straightforward, even for
most extensions.  The UNION and MAP extensions thusfar prove impossible to port
without modifying the UDT interface.  Existing compilers can candle these
extensions (intel ifort and portland group) but there is no open source
alternative available afaik.  UNIONs and MAPs are widely lamented exclusions of
the later fortran standards.  Addition of support for these extensions would
facilitate automated conversion of much existing code to gfortran-compatible
code.