re PR fortran/30793 (Segfault on calling a function returning a pointer)

fortran/
2007-02-16  Tobias Burnus  <burnus@net-b.de>

       PR fortran/30793
       * trans-decl.c (gfc_generate_function_code): Do not initialize
         pointers to derived components.

testsuite/
2007-02-16  Tobias Burnus  <burnus@net-b.de>

       PR fortran/30793
       * gfortran.dg/func_derived_4.f90: New test.

From-SVN: r122037

gcc/fortran/ChangeLog

+2007-02-16  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/30793
+	* trans-decl.c (gfc_generate_function_code): Do not initialize
+	  pointers to derived components.
+
 2007-02-15  Sandra Loosemore  <sandra@codesourcery.com>
 	    Brooks Moses  <brooks.moses@codesourcery.com>
 	    Lee Millward  <lee.millward@codesourcery.com>

gcc/fortran/trans-decl.c

@@ -3240,7 +3240,8 @@ gfc_generate_function_code (gfc_namespace * ns)
 
       if (result != NULL_TREE && sym->attr.function
 	    && sym->ts.type == BT_DERIVED
-	    && sym->ts.derived->attr.alloc_comp)
+	    && sym->ts.derived->attr.alloc_comp
+	    && !sym->attr.pointer)
 	{
 	  rank = sym->as ? sym->as->rank : 0;
 	  tmp2 = gfc_nullify_alloc_comp (sym->ts.derived, result, rank);

gcc/testsuite/ChangeLog

+2007-02-16  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/30793
+	* gfortran.dg/func_derived_4.f90: New test.
+
 2007-02-15  Roger Sayle  <roger@eyesopen.com>
 
 	PR middle-end/30391

gcc/testsuite/gfortran.dg/func_derived_4.f90

+! { dg-do run }
+! PR fortran/30793
+! Check that pointer-returing functions
+! work derived types.
+!
+! Contributed by Salvatore Filippone.
+!
+module class_mesh
+  type mesh
+    real(kind(1.d0)), allocatable :: area(:) 
+  end type mesh
+contains 
+  subroutine create_mesh(msh)
+    type(mesh), intent(out) :: msh
+    allocate(msh%area(10))
+    return
+  end subroutine create_mesh
+end module class_mesh
+
+module class_field
+  use class_mesh
+  implicit none
+  private ! Default
+  public :: create_field, field
+  public :: msh_
+
+  type field
+     private
+     type(mesh),     pointer :: msh   => null()
+     integer                 :: isize(2)
+  end type field
+
+  interface msh_
+    module procedure msh_
+  end interface
+  interface create_field
+    module procedure create_field
+  end interface
+contains
+  subroutine create_field(fld,msh)
+    type(field),      intent(out)        :: fld
+    type(mesh),       intent(in), target :: msh
+    fld%msh => msh
+    fld%isize = 1
+  end subroutine create_field
+
+  function msh_(fld)
+    type(mesh), pointer :: msh_
+    type(field), intent(in) :: fld
+    msh_ => fld%msh
+  end function msh_
+end module class_field
+
+module class_scalar_field
+  use class_field
+  implicit none
+  private
+  public :: create_field, scalar_field
+  public :: msh_
+
+  type scalar_field
+    private
+    type(field) :: base
+    real(kind(1.d0)), allocatable :: x(:)  
+    real(kind(1.d0)), allocatable :: bx(:) 
+    real(kind(1.d0)), allocatable :: x_old(:) 
+  end type scalar_field
+
+  interface create_field
+    module procedure create_scalar_field
+  end interface
+  interface msh_
+    module procedure get_scalar_field_msh
+  end interface
+contains
+  subroutine create_scalar_field(fld,msh)
+    use class_mesh
+    type(scalar_field), intent(out)          :: fld
+    type(mesh),         intent(in), target   :: msh
+    call create_field(fld%base,msh)
+    allocate(fld%x(10),fld%bx(20))
+  end subroutine create_scalar_field
+
+  function get_scalar_field_msh(fld)
+    use class_mesh
+    type(mesh), pointer :: get_scalar_field_msh
+    type(scalar_field), intent(in), target  :: fld
+
+    get_scalar_field_msh => msh_(fld%base)
+  end function get_scalar_field_msh
+end module class_scalar_field
+
+program test_pnt
+  use class_mesh
+  use class_scalar_field
+  implicit none
+  type(mesh) :: msh
+  type(mesh), pointer  :: mshp
+  type(scalar_field) :: quality
+  call create_mesh(msh)
+  call create_field(quality,msh)
+  mshp => msh_(quality)
+end program test_pnt
+
+! { dg-final { cleanup-modules "class_mesh class_scalar_field class_mesh" } }