[Bug fortran/84313] New: [F08] reject procedure pointers in COMMON blocks

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84313

            Bug ID: 84313
           Summary: [F08] reject procedure pointers in COMMON blocks
           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: ---

Procedure pointers in COMMON blocks are allowed per F03:R558, but forbidden per
F08:C5100. gfortran allows them at present (cf. PR 36592), so we need a check
to reject them.

The proc_ptr_common_1/2 tests then require the flag -std=f2003.


See also https://github.com/nncarlson/gfortran.dg/issues/5