re PR fortran/71047 (Allocatable component of INTENT(OUT) dummy not set correctly)

2016-05-14  Fritz Reese <fritzoreese@gmail.com>

	PR fortran/71047
	* expr.c (gfc_default_initializer): Avoid extra component refs in
	constructors for derived types and classes.

2016-05-14  Fritz Reese <fritzoreese@gmail.com>
	PR fortran/71047
	* gfortran.dg/pr71047.f08: New test.

From-SVN: r236241

gcc/fortran/ChangeLog

+2016-05-14  Fritz Reese  <fritzoreese@gmail.com>
+
+	PR fortran/71047
+	* expr.c (gfc_default_initializer): Avoid extra component refs in
+	constructors for derived types and classes.
+
 2016-05-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR fortran/70855

gcc/fortran/expr.c

@@ -3975,7 +3975,10 @@ gfc_default_initializer (gfc_typespec *ts)
 
       if (comp->initializer)
 	{
-          ctor->n.component = comp;
+	  /* Save the component ref for STRUCTUREs and UNIONs.  */
+	  if (ts->u.derived->attr.flavor == FL_STRUCT
+	      || ts->u.derived->attr.flavor == FL_UNION)
+	    ctor->n.component = comp;
 	  ctor->expr = gfc_copy_expr (comp->initializer);
 	  if ((comp->ts.type != comp->initializer->ts.type
 	       || comp->ts.kind != comp->initializer->ts.kind)

gcc/testsuite/ChangeLog

+2016-05-14  Fritz Reese  <fritzoreese@gmail.com>
+
+	PR fortran/71047
+	* gfortran.dg/pr71047.f08: New test.
+
 2016-05-13  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.dg/qual-return-5.c, gcc.dg/qual-return-6.c: New tests.

gcc/testsuite/gfortran.dg/pr71047.f08

+! { dg-do compile }
+! { dg-options "-fdump-tree-original" }
+!
+! Fortran/PR71047
+!
+
+module m
+ implicit none
+
+ type, abstract :: c_abstr
+  integer :: i = 0
+ end type c_abstr
+
+ type, extends(c_abstr) :: t_a
+  class(c_abstr), allocatable :: f
+ end type t_a
+ 
+ type, extends(c_abstr) :: t_b
+ end type t_b
+
+contains
+
+ subroutine set(y,x)
+  class(c_abstr), intent(in)  :: x
+  type(t_a),      intent(out) :: y
+   allocate( y%f , source=x )
+ end subroutine set
+
+end module m
+
+
+program p
+ use m
+ implicit none
+
+ type(t_a) :: res
+ type(t_b) :: var
+
+  call set( res , var )
+  write(*,*) res%i
+
+end program p
+
+!
+! Check to ensure the vtable is actually initialized.
+!
+! { dg-final { scan-tree-dump "t_a\\.\\d+\\.f\\._vptr =" "original" } }
+!