C++ PATCH for c++/60167 (reference template parameters)

commit 7b1bb4515ae768ca44e192442d2578ea46c16f96
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Feb 20 23:22:21 2014 -0500

    	PR c++/60167
    	PR c++/60222
    	PR c++/58606
    	* parser.c (cp_parser_template_argument): Restore dereference.
    	* pt.c (template_parm_to_arg): Dereference non-pack expansions too.
    	(process_partial_specialization): Handle deref.
    	(unify): Likewise.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 4673f78..d8ccd2b 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -13937,6 +13937,7 @@  cp_parser_template_argument (cp_parser* parser)
 
 	  if (INDIRECT_REF_P (argument))
 	    {
+	      /* Strip the dereference temporarily.  */
 	      gcc_assert (REFERENCE_REF_P (argument));
 	      argument = TREE_OPERAND (argument, 0);
 	    }
@@ -13975,6 +13976,8 @@  cp_parser_template_argument (cp_parser* parser)
 	      if (address_p)
 		argument = build_x_unary_op (loc, ADDR_EXPR, argument,
 					     tf_warning_or_error);
+	      else
+		argument = convert_from_reference (argument);
 	      return argument;
 	    }
 	}
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 6477fce..4cf387a 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -3861,6 +3861,8 @@  template_parm_to_arg (tree t)
 	  SET_ARGUMENT_PACK_ARGS (t, vec);
 	  TREE_TYPE (t) = type;
 	}
+      else
+	t = convert_from_reference (t);
     }
   return t;
 }
@@ -4218,10 +4220,12 @@  process_partial_specialization (tree decl)
           if (/* These first two lines are the `non-type' bit.  */
               !TYPE_P (arg)
               && TREE_CODE (arg) != TEMPLATE_DECL
-              /* This next line is the `argument expression is not just a
+              /* This next two lines are the `argument expression is not just a
                  simple identifier' condition and also the `specialized
                  non-type argument' bit.  */
-              && TREE_CODE (arg) != TEMPLATE_PARM_INDEX)
+              && TREE_CODE (arg) != TEMPLATE_PARM_INDEX
+	      && !(REFERENCE_REF_P (arg)
+		   && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_PARM_INDEX))
             {
               if ((!packed_args && tpd.arg_uses_template_parms[i])
                   || (packed_args && uses_template_parms (arg)))
@@ -17893,6 +17897,12 @@  unify (tree tparms, tree targs, tree parm, tree arg, int strict,
       /* Unification fails if we hit an error node.  */
       return unify_invalid (explain_p);
 
+    case INDIRECT_REF:
+      if (REFERENCE_REF_P (parm))
+	return unify (tparms, targs, TREE_OPERAND (parm, 0), arg,
+		      strict, explain_p);
+      /* FALLTHRU */
+
     default:
       /* An unresolved overload is a nondeduced context.  */
       if (is_overloaded_fn (parm) || type_unknown_p (parm))
diff --git a/gcc/testsuite/g++.dg/template/ref7.C b/gcc/testsuite/g++.dg/template/ref7.C
new file mode 100644
index 0000000..f6395e2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/ref7.C
@@ -0,0 +1,10 @@ 
+// PR c++/60167
+
+template <int& F>
+struct Foo {
+  typedef int Bar;
+
+  static Bar cache;
+};
+
+template <int& F> typename Foo<F>::Bar Foo<F>::cache;
diff --git a/gcc/testsuite/g++.dg/template/ref8.C b/gcc/testsuite/g++.dg/template/ref8.C
new file mode 100644
index 0000000..a2fc847
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/ref8.C
@@ -0,0 +1,8 @@ 
+// PR c++/60222
+
+template<int&> struct A
+{
+  template<typename> struct B;
+
+  template<typename T> struct B<T*> {};
+};