Don't defer noexcept_deferred_spec.

	* cp-tree.h (unevaluated_noexcept_spec): Don't declare.
	* decl.c (cxx_init_decl_processing): Initialize
	noexcept_deferred_spec.
	* except.c (unevaluated_noexcept_spec): Delete.
	* class.c (deduce_noexcept_on_destructor): Use
	noexcept_deferred_spec directly.
	* method.c (implicitly_declare_fn): Likewise.

From-SVN: r249264

gcc/cp/ChangeLog

 2017-06-16  Nathan Sidwell  <nathan@acm.org>
 
+	Don't defer noexcept_deferred_spec.
+	* cp-tree.h (unevaluated_noexcept_spec): Don't declare.
+	* decl.c (cxx_init_decl_processing): Initialize
+	noexcept_deferred_spec.
+	* except.c (unevaluated_noexcept_spec): Delete.
+	* class.c (deduce_noexcept_on_destructor): Use
+	noexcept_deferred_spec directly.
+	* method.c (implicitly_declare_fn): Likewise.
+
+	Make keyed_classes a vector.
+	* cp-tree.h (CPTI_KEYED_CLASSES, keyed_classes): Delete.
+	(keyed_classes): Declare as vector.
+	* decl.c (keyed_classes): Define.
+	(cxx_init_decl_processing): Allocate it.
+	(record_key_method_defined): Use vec_safe_push.
+	* class.c (finish_struct_1): Likewise.
+	* pt.c (instantiate_class_template_1): Likewise.
+	* decl2.c (c_parse_final_cleanups): Reverse iterate keyed_classes.
+
 	Make rtti lazier
 	* rtti.c (enum tinfo_kind): Add TK_DERIVED_TYPES,
 	TK_VMI_CLASS_TYPES, TK_MAX.  Delete TK_FIXED.

gcc/cp/class.c

@@ -5025,10 +5025,8 @@ void
 deduce_noexcept_on_destructor (tree dtor)
 {
   if (!TYPE_RAISES_EXCEPTIONS (TREE_TYPE (dtor)))
-    {
-      tree eh_spec = unevaluated_noexcept_spec ();
-      TREE_TYPE (dtor) = build_exception_variant (TREE_TYPE (dtor), eh_spec);
-    }
+    TREE_TYPE (dtor) = build_exception_variant (TREE_TYPE (dtor),
+						noexcept_deferred_spec);
 }
 
 /* For each destructor in T, deduce noexcept:

gcc/cp/cp-tree.h

@@ -6317,7 +6317,6 @@ extern tree forward_parm			(tree);
 extern bool is_trivially_xible			(enum tree_code, tree, tree);
 extern bool is_xible				(enum tree_code, tree, tree);
 extern tree get_defaulted_eh_spec		(tree);
-extern tree unevaluated_noexcept_spec		(void);
 extern void after_nsdmi_defaulted_late_checks   (tree);
 extern bool maybe_explain_implicit_delete	(tree);
 extern void explain_implicit_non_constexpr	(tree);

gcc/cp/decl.c

@@ -4078,6 +4078,8 @@ cxx_init_decl_processing (void)
   empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
   noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
   noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
+  noexcept_deferred_spec = build_tree_list (make_node (DEFERRED_NOEXCEPT),
+					    NULL_TREE);
 
 #if 0
   record_builtin_type (RID_MAX, NULL, string_type_node);

gcc/cp/except.c

@@ -1197,18 +1197,6 @@ build_noexcept_spec (tree expr, int complain)
     }
 }
 
-/* Returns a noexcept-specifier to be evaluated later, for an
-   implicitly-declared or explicitly defaulted special member function.  */
-
-tree
-unevaluated_noexcept_spec (void)
-{
-  if (!noexcept_deferred_spec)
-    noexcept_deferred_spec
-      = build_noexcept_spec (make_node (DEFERRED_NOEXCEPT), tf_none);
-  return noexcept_deferred_spec;
-}
-
 /* Returns a TRY_CATCH_EXPR that will put TRY_LIST and CATCH_LIST in the
    TRY and CATCH locations.  CATCH_LIST must be a STATEMENT_LIST */
 

gcc/cp/method.c

@@ -2023,7 +2023,7 @@ implicitly_declare_fn (special_function_kind kind, tree type,
     }
   else if (cxx_dialect >= cxx11)
     {
-      raises = unevaluated_noexcept_spec ();
+      raises = noexcept_deferred_spec;
       synthesized_method_walk (type, kind, const_p, NULL, &trivial_p,
 			       &deleted_p, &constexpr_p, false,
 			       inherited_ctor, inherited_parms);