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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/47463] [OOP] ICE in gfc_add_component_ref
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47463

--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-01-31 21:42:29 UTC ---
(In reply to comment #6)
> > And the same without type-binding:
> >     call init_comps(this, st, gr)
> > Error: Type mismatch in argument 'this' at (1); passed CLASS(flow_t) to
> > CLASS(grid_t)

I looked closer at that version.

a)  It works if one reverses the order of subroutines (all versions)

Rich: That's a work around, which is sufficient to compile the whole program.
Note: You need a gfortran, which includes Janus' patch from comment 8.


b) For the failing version. The formal argument in compare_actual_formal alias
compare_parameter is odd:

(gdb) p a->expr->ts.u.derived->name
$17 = 0x2aaaacf0eae0 "__class_hydro_flow_Flow_t"
(gdb) p f->sym->ts.u.derived->name
$18 = 0x2aaaacf0eac0 "__class_hydro_grid_Grid_t_a"
(gdb) p f->sym->name
$19 = 0x2aaaace40fb0 "this"

Namely, the formal argument has the right name, but it is associated with the
wrong typespec!

 * * *

Reduced test case:

module hydro_grid
  type :: grid_t
   contains
     procedure :: assign
     generic   :: assignment(=) => assign
  end type grid_t
  public :: grid_t
contains
  subroutine assign (this, that)
    class(grid_t), intent(inout) :: this
    class(grid_t), intent(in)    :: that
  end subroutine assign
end module hydro_grid

module hydro_flow
  use hydro_grid
  type :: flow_t
     class(grid_t), allocatable  :: gr     ! Computation grid
  end type flow_t
contains
  subroutine init_params (this)
    class(flow_t), intent(out) :: this
    type(grid_t)               :: gr
   call init_comps(this, gr)
  end subroutine init_params
  subroutine init_comps (this, gr)
    class(flow_t), intent(out) :: this
    class(grid_t), intent(in)  :: gr
    this%gr = gr
  end subroutine init_comps
end module hydro_flow