re PR c++/49066 ([C++0x] Non-defining declaration of deleted function suppresses usage validation)

	PR c++/49066
	* decl.c (duplicate_decls): Preserve DECL_DELETED_FN.

From-SVN: r173993

gcc/cp/ChangeLog

 2011-05-20  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49066
+	* decl.c (duplicate_decls): Preserve DECL_DELETED_FN.
+
 	PR c++/48873
 	* tree.c (stabilize_expr): Fix typo.
 

gcc/cp/decl.c

@@ -1688,6 +1688,7 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
 	  error ("deleted definition of %qD", newdecl);
 	  error ("after previous declaration %q+D", olddecl);
 	}
+      DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
     }
 
   /* Deal with C++: must preserve virtual function table size.  */

gcc/testsuite/ChangeLog

 2011-05-20  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/defaulted26.C: New.
+
 	* g++.dg/cpp0x/noexcept02.C: Fix.
 	* g++.dg/cpp0x/noexcept03.C: Fix.
 	* g++.dg/cpp0x/noexcept08.C: Fix.

gcc/testsuite/g++.dg/cpp0x/defaulted26.C

+// PR c++/49066
+// { dg-options -std=c++0x }
+
+void foo() = delete;		// { dg-error "declared here" }
+void foo();
+
+int main() { foo(); }		// { dg-error "deleted" }