DR 1558 PR c++/67021

	DR 1558
	PR c++/67021
	* pt.c (tsubst_decl) [TYPE_DECL]: Clear TYPE_DEPENDENT_P_VALID.

From-SVN: r226381

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 0fa0926cd5ce60e8d0e558d90ddfff8ee282b871..7356dff5ba28a0dc14658a4c18df4043af0c7b0a 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2015-07-30  Jason Merrill  <jason@redhat.com>
+
+       DR 1558
+       PR c++/67021
+       * pt.c (tsubst_decl) [TYPE_DECL]: Clear TYPE_DEPENDENT_P_VALID.
+
 2015-07-28  Paolo Carlini  <paolo.carlini@oracle.com>
 
        * call.c (build_op_delete_call, convert_like_real, build_over_call):

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index e92fefb416d2ae167082109e403daf4c795ed06f..6bf3d23f2a7a45d15b9ec9521104b14d93f39f92 100644 (file)
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -11570,6 +11570,10 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
          {
            DECL_ORIGINAL_TYPE (r) = NULL_TREE;
            set_underlying_type (r);
+           if (TYPE_DECL_ALIAS_P (r) && type != error_mark_node)
+             /* An alias template specialization can be dependent
+                even if its underlying type is not.  */
+             TYPE_DEPENDENT_P_VALID (TREE_TYPE (r)) = false;
          }
 
        layout_decl (r, 0);

diff --git a/gcc/testsuite/g++.dg/cpp0x/alias-decl-52.C b/gcc/testsuite/g++.dg/cpp0x/alias-decl-52.C
new file mode 100644 (file)
index 0000000..2734075
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/alias-decl-52.C
@@ -0,0 +1,24 @@
+// PR c++/67021
+// { dg-do compile { target c++11 } }
+
+template<typename> struct Dummy;
+template<> struct Dummy<int> {};
+
+template <class...>
+struct all_same { static constexpr bool value = true; };
+template <class T, class...Rest>
+struct all_same<T, T, Rest...> : all_same<T, Rest...> {};
+template <class T, class U, class...Rest>
+struct all_same<T, U, Rest...> { static constexpr bool value = false; };
+
+template <class R>
+using ValueType = int;
+
+template <class I>
+constexpr bool A(I i) {
+  return all_same<ValueType<I>, ValueType<decltype(i++)>>::value;
+}
+
+int main() {
+  static_assert(A(42), "");
+}