[Bug fortran/85839] New: [F2018] warn for obsolescent features

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85839

            Bug ID: 85839
           Summary: [F2018] warn for obsolescent features
           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: ---

Fortran 2018 introduces several new obsolescences:
 * COMMON
 * EQUIVALENCE
 * BLOCK DATA
 * labelled DO statements
 * specific names for standard intrinsic functions
 * FORALL

(see also PR 40881, where the same has been done for the F03 obsolenscences)