re PR c++/33496 (ICE with sizeof for invalid argument pack)

	PR c++/33496
	* pt.c (tsubst_copy) <case SIZEOF_EXPR>: Handle error_mark_node
	returned from tsubst_pack_expansion.
	(tsubst_copy_and_build) <case SIZEOF_EXPR>: Likewise.
	(tsubst_copy_and_build) <case CONSTRUCTOR>: Likewise.

	* g++.dg/cpp0x/variadic76.C: New test.
	* g++.dg/cpp0x/variadic77.C: New test.
	* g++.dg/cpp0x/variadic78.C: New test.

From-SVN: r128630

gcc/cp/pt.c

@@ -9584,6 +9584,8 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
           /* We only want to compute the number of arguments.  */
           tree expanded = tsubst_pack_expansion (TREE_OPERAND (t, 0), args,
                                                 complain, in_decl);
+	  if (expanded == error_mark_node)
+	    return error_mark_node;
           return build_int_cst (size_type_node, TREE_VEC_LENGTH (expanded));
         }
       /* Fall through */
@@ -10584,6 +10586,8 @@ tsubst_copy_and_build (tree t,
           /* We only want to compute the number of arguments.  */
           tree expanded = tsubst_pack_expansion (TREE_OPERAND (t, 0), args,
                                                 complain, in_decl);
+	  if (expanded == error_mark_node)
+	    return error_mark_node;
           return build_int_cst (size_type_node, TREE_VEC_LENGTH (expanded));
         }
       /* Fall through */
@@ -10976,7 +10980,9 @@ tsubst_copy_and_build (tree t,
                 ce->value = tsubst_pack_expansion (ce->value, args, complain,
                                                   in_decl);
 
-                if (TREE_VEC_LENGTH (ce->value) == 1)
+		if (ce->value == error_mark_node)
+		  ;
+		else if (TREE_VEC_LENGTH (ce->value) == 1)
                   /* Just move the argument into place.  */
                   ce->value = TREE_VEC_ELT (ce->value, 0);
                 else

gcc/testsuite/ChangeLog

 2007-09-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/33496
+	* g++.dg/cpp0x/variadic76.C: New test.
+	* g++.dg/cpp0x/variadic77.C: New test.
+	* g++.dg/cpp0x/variadic78.C: New test.
+
 	PR c/33238
 	PR c/27301
 	* gcc.c-torture/execute/20070919-1.c: New test.

gcc/testsuite/g++.dg/cpp0x/variadic76.C

+// PR c++/33496
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+template<int... N> int foo ()
+{
+  return sizeof... N ();	// { dg-error "cannot be used as a function" }
+}
+
+int bar ()
+{
+  return foo<0> ();
+}

gcc/testsuite/g++.dg/cpp0x/variadic77.C

+// PR c++/33496
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+template<int M, int N> struct pair
+{
+  int i, j;
+  pair () : i (M), j (N) {}
+};
+
+template<int... M> struct S
+{
+  template<int... N> static int foo ()
+  {
+    return sizeof... (pair<M, N>);	// { dg-error "mismatched argument pack lengths" }
+  }
+};
+
+int bar ()
+{
+  return S<0, 1, 2>::foo<0, 1> ();
+}

gcc/testsuite/g++.dg/cpp0x/variadic78.C

+// PR c++/33496
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+template<int M, int N> struct pair
+{
+  int i, j;
+  pair () : i (M), j (N) {}
+};
+
+template<int... M> struct S
+{
+  template<int... N> static int *foo ()
+  {
+    static int x[] = { (M + N)... };	// { dg-error "mismatched argument pack lengths" }
+    return x;
+  }
+};
+
+int *bar ()
+{
+  return S<0, 1, 2>::foo<0, 1> ();
+}