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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/104651] [OOP] CLASS with assumed-size/assumed-rank array
Date: Tue, 22 Feb 2022 22:01:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104651

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #0)
> The following looks valid - but gfortran complains:
>=20
>     7 | call bar(A)
>       |         1
> Error: Rank mismatch in argument =E2=80=98x=E2=80=99 at (1) (rank-1 and r=
ank-2)
>=20
>     8 | call bar2(B)
>       |          1
> Error: Rank mismatch in argument =E2=80=98y=E2=80=99 at (1) (rank-2 and r=
ank-1)
>=20
>=20
> Additionally, I had expected that the array is passed just to class->_dat=
a,
> but the dump shows that there is a full array descriptor, i.e.
> class->_data.data for the dummy argument.
>=20
>=20
> In trans-types.cc's gfc_get_derived_type, the code path taken is:
>=20
>           if (c->attr.pointer || c->attr.allocatable || c->attr.pdt_array)
> ...
>               field_type =3D gfc_build_array_type (field_type, c->as, aki=
nd,
>=20
> and not:
>           else
>             field_type =3D gfc_get_nodesc_array_type (field_type, c->as,
>                                                     PACKED_STATIC,
>                                                     !c->attr.target);
>=20
>=20
> implicit none (type, external)
> type t
> integer :: i
> end type t
> type(t) :: A(10,10), B(10)
>=20
> call bar(A)
> call bar2(B)
> contains
> subroutine bar(x)
>   class(t) :: x(*)
>   x(1)%i =3D x(2)%i
> end
> subroutine bar2(y)
>   class(t) :: y(5,10)
>   y(1,1)%i =3D y(2,2)%i
> end
> end

Error look correct to me.  Interfaces are resolved by type, kind, and rank;
sometimes referred to TKR.  Is there an exception for class?=