1 files changed, 81 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/interface_32.f90 b/gcc/testsuite/gfortran.dg/interface_32.f90
new file mode 100644
index 000000000..6cdb091ae
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/interface_32.f90
@@ -0,0 +1,81 @@
+! { dg-do compile }
+module m1
+  implicit none
+
+  type, abstract :: vector_class
+  end type vector_class
+end module m1
+!---------------------------------------------------------------
+module m2
+  use m1
+  implicit none
+
+  type, abstract :: inner_product_class
+  contains
+    procedure(dot), deferred :: dot_v_v
+    procedure(dot), deferred :: dot_g_g
+    procedure(sub), deferred :: D_times_v
+    procedure(sub), deferred :: D_times_g
+  end type inner_product_class
+
+  abstract interface
+    function dot (this,a,b)
+      import :: inner_product_class
+      import :: vector_class
+      class(inner_product_class), intent(in) :: this
+      class(vector_class),        intent(in) :: a,b
+      real                                   :: dot
+    end function
+    subroutine sub (this,a)
+      import :: inner_product_class
+      import :: vector_class
+      class(inner_product_class), intent(in)    :: this
+      class(vector_class),        intent(inout) :: a
+    end subroutine
+  end interface
+end module m2
+!---------------------------------------------------------------
+module m3
+  use :: m1
+  use :: m2
+  implicit none
+  private
+  public :: gradient_class
+
+  type, abstract, extends(vector_class) :: gradient_class
+    class(inner_product_class), pointer :: my_inner_product => NULL()
+  contains
+    procedure, non_overridable  :: inquire_inner_product
+    procedure(op_g_v), deferred :: to_vector
+  end type gradient_class
+
+  abstract interface
+    subroutine op_g_v(this,v)
+      import vector_class
+      import gradient_class
+      class(gradient_class), intent(in)    :: this
+      class(vector_class),   intent(inout) :: v
+    end subroutine
+  end interface
+contains
+  function inquire_inner_product (this)
+    class(gradient_class)               :: this
+    class(inner_product_class), pointer :: inquire_inner_product
+
+    inquire_inner_product => this%my_inner_product
+  end function inquire_inner_product
+end module m3
+!---------------------------------------------------------------
+module m4
+  use m3
+  use m2
+  implicit none
+contains
+  subroutine cg (g_initial)
+    class(gradient_class),  intent(in)    :: g_initial
+
+    class(inner_product_class), pointer   :: ip_save
+    ip_save => g_initial%inquire_inner_product()
+  end subroutine cg
+end module m4
+! { dg-final { cleanup-modules "m1 m2 m3 m4" } }