[Bug fortran/84382] New: add command-line options -std=gnu2003 and -std=gnu2008 for gfortran

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84382

            Bug ID: 84382
           Summary: add command-line options -std=gnu2003 and -std=gnu2008
                    for gfortran
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: janus at gcc dot gnu.org
  Target Milestone: ---

In analogy to the g++ options -std=gnu++17 etc (as apposed to -std=c++17),
gfortran should have options like -std=gnu2003 and -std=gnu2008 that instruct
the compiler to adhere to a given Fortran standard plus GNU extensions.