2010-11-23  Basile Starynkevitch  <basile@starynkevitch.net>

	* gengtype.c (enum typekind, struct options)
	(struct nested_ptr_data, struct pair, NUM_PARAM)
	(enum gc_used_num, struct type, UNION_P, UNION_OR_STRUCT_P):
	Move to gengtype.h.
	(string_type, scalar_nonchar, scalar_nonchar, scalar_char):
	Remove static, add zero state_number.
	(typedefs, structures, param_structs, variables): Remove static.
	(create_option): Remove.
	(create_string_option, create_type_option, create_nested_option):
	New functions.
	(create_nested_ptr_option): Use create_nested_option.
	(note_variable, adjust_field_rtx_def, adjust_field_type): Call the
	new create*option functions.
	(process_gc_options): Adjust for discriminated option.
	(output_mangled_typename): Handle TYPE_NONE.
	(walk_type): Test option kinds.
	(write_types_process_field): Handle TYPE_NONE and TYPE_ARRAY.
	(write_func_for_structure, write_type, write_local, write_root)
	(write_roots, note_def_vec, dump_options): Adjust for
	discriminated option.

	gengtype.h
	(typedefs, structures, param_structs, variables, enum typekind):
	Move from gengtype.c
	(enum option_kind): New discriminating enumeration.
	(struct options): Becomes discriminated.
	(struct nested_ptr_data): Nove from gengtype.c
	(create_string_option, create_type_option, create_nested_option)
	(create_nested_ptr_option): New functions
	(struct pair, enum_gc_used_enum, NUM_PARAM, struct type, UNION_P)
	(UNION_OR_STRUCT_P): Move from gengtype.c

	* gengtype-parse.c (str_optvalue_opt, type_optvalue, option): Make
	discriminated options.