[Bug fortran/64589] New: Undefined reference to integer 4 with unlimited polymorphism in two modules plus main

["damian at sourceryinstitute dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64589

            Bug ID: 64589
           Summary: Undefined reference to integer 4 with unlimited
                    polymorphism in two modules plus main
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: damian at sourceryinstitute dot org

Using unlimited polymorphism appears to generate a linking error due to an
unrecognized integer symbol: 

$cat more-fun-with-unlimited-poly.f90 
module ASTG_FormatParser_mod
contains
  subroutine fmt()
    class(*), pointer :: arg
    select type (arg)
    type is (integer)
    end select
  end subroutine 
end module 
module ASTG_MpiFileHandler_mod
contains
  subroutine makeString(arg1)
    class(*) :: arg1
  end subroutine 
  subroutine getSuffix()
    use ASTG_FormatParser_mod
    call makeString(1)
  end subroutine
end module 
end
$gfortran more-fun-with-unlimited-poly.f90 
/tmp/cccnDYiT.o: In function `__astg_mpifilehandler_mod_MOD_getsuffix':
more-fun-with-unlimited-poly.f90:(.text+0x44): undefined reference to
`__vtab_INTEGER_4_.3435'
collect2: error: ld returned 1 exit status
$gfortran --version | head -1
GNU Fortran (GCC) 5.0.0 20141222 (experimental)