re PR c++/51344 (cc1plus hangs when compiling)

2012-01-19  Kai Tietz  <ktietz@redhat.com>

        PR c++/51344
        * decl2.c (save_template_attributes): Use merge_attributes
        instead of chaining up via TREE_CHAIN.

2012-01-19  Kai Tietz  <ktietz@redhat.com>

        * g++.dg/torture/pr51344.C: New test.

From-SVN: r183313

gcc/cp/ChangeLog

+2012-01-19  Kai Tietz  <ktietz@redhat.com>
+
+	PR c++/51344
+	* decl2.c (save_template_attributes): Use merge_attributes
+	instead of chaining up via TREE_CHAIN.
+
 2012-01-19  Jason Merrill  <jason@redhat.com>
 
 	PR c++/51889

gcc/cp/decl2.c

@@ -1199,9 +1199,9 @@ save_template_attributes (tree *attr_p, tree *decl_p)
 
   old_attrs = *q;
 
-  /* Place the late attributes at the beginning of the attribute
+  /* Merge the late attributes at the beginning with the attribute
      list.  */
-  TREE_CHAIN (tree_last (late_attrs)) = *q;
+  late_attrs = merge_attributes (late_attrs, *q);
   *q = late_attrs;
 
   if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))

gcc/testsuite/ChangeLog

+2012-01-19  Kai Tietz  <ktietz@redhat.com>
+
+	* g++.dg/torture/pr51344.C: New test.
+
 2012-01-19  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/51904

gcc/testsuite/g++.dg/torture/pr51344.C

+/* { dg-do compile } */
+template <class T>
+class B
+{
+  friend __attribute__((cdecl)) A& operator >>(A& a, B& b)
+  {
+    return a;
+  }
+};