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* cp-tree.h (FNDECL_USED_AUTO): New macro. (LAMBDA_EXPR_DEDUCE_RETURN_TYPE_P): Remove. (dependent_lambda_return_type_node): Remove. (CPTI_DEPENDENT_LAMBDA_RETURN_TYPE): Remove. (struct language_function): Add x_auto_return_pattern field. (current_function_auto_return_pattern): New. (enum tsubst_flags): Add tf_partial. * decl.c (decls_match): Handle auto return comparison. (duplicate_decls): Adjust error message for auto return. (cxx_init_decl_processing): Remove dependent_lambda_return_type_node. (cp_finish_decl): Don't do auto deduction for functions. (grokdeclarator): Allow auto return without trailing return type in C++1y mode. (check_function_type): Defer checking of deduced return type. (start_preparsed_function): Set current_function_auto_return_pattern. (finish_function): Set deduced return type to void if not previously deduced. * decl2.c (change_return_type): Handle error_mark_node. (mark_used): Always instantiate functions with deduced return type. Complain about use if deduction isn't done. * parser.c (cp_parser_lambda_declarator_opt): Use 'auto' for initial return type. (cp_parser_lambda_body): Don't deduce return type in a template. (cp_parser_conversion_type_id): Allow auto in C++1y. * pt.c (instantiate_class_template_1): Don't mess with LAMBDA_EXPR_DEDUCE_RETURN_TYPE_P. (tsubst_copy_and_build): Likewise. (fn_type_unification, tsubst): Don't reduce the template parm level of 'auto' during deduction. (unify): Compare 'auto' specially. (get_bindings): Change test. (always_instantiate_p): Always instantiate functions with deduced return type. (do_auto_deduction): Handle error_mark_node and lambda context. Don't check for use in initializer. (contains_auto_r): Remove. * search.c (lookup_conversions_r): Handle auto conversion function. * semantics.c (lambda_return_type): Handle null return. Don't mess with dependent_lambda_return_type_node. (apply_deduced_return_type): Rename from apply_lambda_return_type. * typeck.c (merge_types): Handle auto. (check_return_expr): Do auto deduction. * typeck2.c (add_exception_specifier): Fix complain check. From-SVN: r185768
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