[Patch, fortran] OOP bugs - PRs 41587, 41608, 41618 and 41629

[Paul Richard Thomas]

This patch applies various attribute checks to class objects, which
either were not previously applied or at the wrong time relative to
encapsulation.  It also fixes a bug in gfc_build_block_ns.

Bootstrapped and regtested on FC9/x86_64 - OK for trunk?

Paul

2009-10-17  Janus Weil  <janus@gcc.gnu.org>
	    Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/41608
	* decl.c (gfc_match_data_decl): Add BT_CLASS for undefined type
	and empty type errors.
	* parse.c (gfc_build_block_ns): Only set recursive if parent ns
	has a proc_name.

	PR fortran/41629
	PR fortran/41618
	PR fortran/41587
	* gfortran.h : Add class_ok bitfield to symbol_attr.
	* decl.c (build_sym): Set attr.class_ok if dummy, pointer or
	allocatable.
	(build_struct): Use gfc_try 't' to carry errors past the call
	to encapsulate_class_symbol.
	(attr_decl1): For a CLASS object, apply the new attribute to
	the data component.
	* match.c (gfc_match_select_type): Set attr.class_ok for an
	assigned selector.
	* resolve.c (resolve_fl_variable_derived): Check a CLASS object
	is dummy, pointer or allocatable by testing the class_ok and
	the use_assoc attribute.

2009-10-17  Janus Weil  <janus@gcc.gnu.org>
	    Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/41629
	* gfortran.dg/class_6.f90: New test.

	PR fortran/41608
	PR fortran/41587
	* gfortran.dg/class_7.f90: New test.

	PR fortran/41618
	* gfortran.dg/class_8.f90: New test.
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