re PR c++/77812 (incorrectly rejects valid C++ code that uses enum in template instantiation)

	cp/
	PR c++/77812
	* name-lookup.c (set_namespace_binding_1): An overload of 1 decl
	is a new overload.

	testsuite/
	PR c++/77812
	* g++.dg/pr77812.C: New.

From-SVN: r244335

gcc/cp/ChangeLog

 2017-01-11  Nathan Sidwell  <nathan@acm.org>
 
+	PR c++/77812
+	* name-lookup.c (set_namespace_binding_1): An overload of 1 decl
+	is a new overload.
+
+2017-01-11  Nathan Sidwell  <nathan@acm.org>
+
 	* name-lookup.c (push_overloaded_decl_1): Refactor OVERLOAD creation.
 
 2017-01-11  Jakub Jelinek  <jakub@redhat.com>

gcc/cp/name-lookup.c

@@ -3496,7 +3496,12 @@ set_namespace_binding_1 (tree name, tree scope, tree val)
   if (scope == NULL_TREE)
     scope = global_namespace;
   b = binding_for_name (NAMESPACE_LEVEL (scope), name);
-  if (!b->value || TREE_CODE (val) == OVERLOAD || val == error_mark_node)
+  if (!b->value
+      /* For templates and using we create a single element OVERLOAD.
+	 Look for the chain to know whether this is really augmenting
+	 an existing overload.  */
+      || (TREE_CODE (val) == OVERLOAD && OVL_CHAIN (val))
+      || val == error_mark_node)
     b->value = val;
   else
     supplement_binding (b, val);

gcc/testsuite/ChangeLog

+2017-01-11  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/77812
+	* g++.dg/pr77812.C: New.
+
 2017-01-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/71537

gcc/testsuite/g++.dg/pr77812.C

+// PR77812
+// struct-stat hack failure when first overload is a template
+
+enum f {};
+
+template <typename>
+void f ()
+{
+}
+enum f F;
+
+struct g {};
+
+template <typename>
+void g ()
+{
+}
+struct g G;