re PR fortran/33395 ([ISO_C_BINDING ?] ICE (segfault) in gfc_conv_initializer)

2007-09-12  Christopher D. Rickett  <crickett@lanl.gov>

	PR fortran/33395
	* trans-expr.c (gfc_conv_initializer): Remove unnecessary test for
	intmod_sym_id and use derived symbol to set new kind of C_NULL_PTR
	and C_NULL_FUNPTR expressions.

2007-09-12  Christopher D. Rickett  <crickett@lanl.gov>

	PR fortran/33395
	* gfortran.dg/c_ptr_tests_12.f03: New test case.

From-SVN: r128418

gcc/fortran/ChangeLog

+2007-09-12  Christopher D. Rickett  <crickett@lanl.gov>
+
+	PR fortran/33395
+	* trans-expr.c (gfc_conv_initializer): Remove unnecessary test for
+	intmod_sym_id and use derived symbol to set new kind of C_NULL_PTR
+	and C_NULL_FUNPTR expressions.
+
 2007-09-11  Christopher D. Rickett  <crickett@lanl.gov>
 
 	PR fortran/33040

gcc/fortran/trans-expr.c

@@ -2851,12 +2851,22 @@ gfc_conv_initializer (gfc_expr * expr, gfc_typespec * ts, tree type,
   if (!(expr || pointer))
     return NULL_TREE;
 
-  if (expr != NULL && expr->ts.type == BT_DERIVED
-      && expr->ts.is_iso_c && expr->ts.derived
-      && (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
-	  || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR))
+  /* Check if we have ISOCBINDING_NULL_PTR or ISOCBINDING_NULL_FUNPTR
+     (these are the only two iso_c_binding derived types that can be
+     used as initialization expressions).  If so, we need to modify
+     the 'expr' to be that for a (void *).  */
+  if (expr->ts.type == BT_DERIVED && expr->ts.is_iso_c && expr->ts.derived)
+    {
+      gfc_symbol *derived = expr->ts.derived;
+
       expr = gfc_int_expr (0);
 
+      /* The derived symbol has already been converted to a (void *).  Use
+	 its kind.  */
+      expr->ts.f90_type = derived->ts.f90_type;
+      expr->ts.kind = derived->ts.kind;
+    }
+  
   if (array)
     {
       /* Arrays need special handling.  */

gcc/testsuite/ChangeLog

+2007-09-12  Christopher D. Rickett  <crickett@lanl.gov>
+
+	PR fortran/33395
+	* gfortran.dg/c_ptr_tests_12.f03: New test case.
+
 2007-09-12  Dorit Nuzman  <dorit@il.ibm.com>
 
 	PR tree-optimization/33373

gcc/testsuite/gfortran.dg/c_ptr_tests_12.f03

+! { dg-do compile }
+! Verify that initialization of c_ptr components works.  This is based on 
+! code from fgsl: 
+! http://www.lrz-muenchen.de/services/software/mathematik/gsl/fortran/
+! and tests PR 33395.
+module fgsl
+  use, intrinsic :: iso_c_binding
+  implicit none
+!
+!
+! Kind and length parameters are default integer
+!
+  integer, parameter, public :: fgsl_double = c_double
+
+!
+! Types : Array support
+!
+  type, public :: fgsl_vector
+     private
+     type(c_ptr) :: gsl_vector = c_null_ptr
+  end type fgsl_vector
+
+contains
+  function fgsl_vector_align(p_x, f_x)
+    real(fgsl_double), pointer :: p_x(:)
+    type(fgsl_vector) :: f_x
+    integer :: fgsl_vector_align
+    fgsl_vector_align = 4
+  end function fgsl_vector_align
+end module fgsl
+
+module tmod
+  use fgsl
+  implicit none
+contains
+  subroutine expb_df() bind(c)
+    type(fgsl_vector) :: f_x
+    real(fgsl_double), pointer :: p_x(:)
+    integer :: status
+    status = fgsl_vector_align(p_x, f_x)
+  end subroutine expb_df
+end module tmod
+
+! { dg-final { cleanup-modules "fgsl tmod" } } 
+