Index: gcc/cp/decl.c
===================================================================
--- gcc/cp/decl.c	(revision 140838)
+++ gcc/cp/decl.c	(working copy)
@@ -6531,10 +6531,10 @@ grokfndecl (tree ctype,
     {
     case sfk_constructor:
     case sfk_copy_constructor:
-      DECL_CONSTRUCTOR_P (decl) = 1;
+      DECL_CONSTRUCTOR_P (decl) = (ctype != NULL_TREE);
       break;
     case sfk_destructor:
-      DECL_DESTRUCTOR_P (decl) = 1;
+      DECL_DESTRUCTOR_P (decl) =  (ctype != NULL_TREE);
       break;
     default:
       break;