re PR lto/53808 (Undefined symbol when building a library with lto)

	PR lto/53808
	PR c++/61659
	* pt.c (push_template_decl_real): Don't set DECL_COMDAT on friends.

From-SVN: r213311

gcc/cp/ChangeLog

+2014-07-30  Jason Merrill  <jason@redhat.com>
+
+	PR lto/53808
+	PR c++/61659
+	* pt.c (push_template_decl_real): Don't set DECL_COMDAT on friends.
+
 2014-07-30  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/57397

gcc/cp/pt.c

@@ -5021,6 +5021,7 @@ template arguments to %qD do not match original template %qD",
     }
 
   if (flag_implicit_templates
+      && !is_friend
       && VAR_OR_FUNCTION_DECL_P (decl))
     /* Set DECL_COMDAT on template instantiations; if we force
        them to be emitted by explicit instantiation or -frepo,

gcc/testsuite/g++.dg/template/friend56.C

+// Make sure we don't mistakenly mark f as DECL_COMDAT.
+// { dg-final { scan-assembler "_Z1fv" } }
+
+void f();
+
+template <class T> struct A
+{
+  friend void f();
+};
+
+A<int> a;
+
+void f() { }