PR c++/78749 - friend in anonymous namespace

	* decl.c (wrapup_globals_for_namespace): Don't complain about friend
	pseudo-template instantiations.

From-SVN: r243862

gcc/cp/ChangeLog

+2016-12-21  Jason Merrill  <jason@redhat.com>
+
+	PR c++/78749 - friend in anonymous namespace
+	* decl.c (wrapup_globals_for_namespace): Don't complain about friend
+	pseudo-template instantiations.
+
 2016-12-16  Richard Biener  <rguenther@suse.de>
 
 	PR c++/71694

gcc/cp/decl.c

@@ -926,6 +926,7 @@ wrapup_globals_for_namespace (tree name_space, void* data ATTRIBUTE_UNUSED)
 	    && DECL_EXTERNAL (decl)
 	    && !TREE_PUBLIC (decl)
 	    && !DECL_ARTIFICIAL (decl)
+	    && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
 	    && !TREE_NO_WARNING (decl))
 	  {
 	    warning_at (DECL_SOURCE_LOCATION (decl),

gcc/testsuite/g++.dg/warn/Wunused-function3.C

+// { dg-options -Wunused-function }
+
+namespace
+{
+  template <class T> struct A
+  {
+    friend void f(A) { }
+  };
+
+  A<int> a;
+}