[Bug fortran/44814] New: ISO_C_BINDING types inherited from a USEd module are corrupted

[jkrahn at nc dot rr dot com]

$ cat ptr_bug.f90
module mod1
  use iso_c_binding, only: C_ptr
end module mod1
module mod2
  use mod1
  use iso_c_binding, only: C_NULL_ptr
contains
  subroutine bug
    type(C_ptr) :: ptr
    ptr=C_NULL_ptr
  end subroutine bug
end module mod2

$ /usr/local/gfortran/bin/gfortran -c ptr_bug.f90
ptr_bug.f90:10.8:

    ptr=C_NULL_ptr
        1
Error: Can't convert TYPE(_gfortran_iso_c_binding_c_ptr) to TYPE(c_ptr) at (1)


The inherited name gets an internal "_gfortran_iso_c_binding_" prefix, but the
locally inherited name does not. This is mentioned in bug37829, where it was
suggested to be low priority or even just an enhancement. IMHO, anything that
prevents perfectly valid code form compiling should be at least normal status.


-- 
           Summary: ISO_C_BINDING types inherited from a USEd module are
                    corrupted
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jkrahn at nc dot rr dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44814