* objc/objc-act.c (objc_init): Use dump_base_name.
(gen_declaration): Clear the buffer arg.
(gen_declaration_1): New function, body of gen_declaration.
(adorn_decl): Call gen_declaration_1 instead of gen_declaration.
(gen_method_decl): Ditto, plus always clear buffer arg.
(error_with_ivar): Simplify.
(warn_with_method): Ditto.
(build_message_expr): Don't clear buffers.
(dump_interface): Ditto.
(objc_debug): Ditto.
(build_keyword_selector): Clear the buffer by only zeroing
the first element.
(objc_implementation_context): Declare.
(start_class): Warn about missing @end.
(finish_objc): Ditto.