2009-10-05  Paul Thomas  <pault@gcc.gnu.org>

	* trans-expr.c (select_class_proc): New function.
	(conv_function_val): Deal with class methods and call above.
	* symbol.c (gfc_type_compatible): Treat case where both ts1 and
	ts2 are BT_CLASS.
	gfortran.h : Add structure gfc_class_esym_list and include in
	the structure gfc_expr.
	* module.c (load_derived_extensions): New function.
	(read_module): Call above.
	(write_dt_extensions): New function.
	(write_derived_extensions): New function.
	(write_module): Use the above.
	* resolve.c (resolve_typebound_call): Add a function expression
	for class methods.  This carries the chain of symbols for the
	dynamic dispatch in select_class_proc.
	(resolve_compcall): Add second, boolean argument to indicate if
	a function is being handled.
	(check_members): New function.
	(check_class_members): New function.
	(resolve_class_compcall): New function.
	(resolve_class_typebound_call): New function.
	(gfc_resolve_expr): Call above for component calls.. 

2009-10-05  Paul Thomas  <pault@gcc.gnu.org>

	* gfortran.dg/dynamic_dispatch_1.f90: New test.
	* gfortran.dg/dynamic_dispatch_2.f90: New test.
	* gfortran.dg/dynamic_dispatch_3.f90: New test.
	* gfortran.dg/module_md5_1.f90: Update md5 sum.

From-SVN: r152463