--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move1.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,132 @@
+// PR c++/86981
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wpessimizing-move" }
+
+// Define std::move.
+namespace std {
+  template<typename _Tp>
+    struct remove_reference
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct remove_reference<_Tp&>
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    struct remove_reference<_Tp&&>
+    { typedef _Tp   type; };
+
+  template<typename _Tp>
+    constexpr typename std::remove_reference<_Tp>::type&&
+    move(_Tp&& __t) noexcept
+    { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
+}
+
+struct T {
+  T() { }
+  T(const T&) { }
+  T(T&&) { }
+};
+struct U {
+  U() { }
+  U(const U&) { }
+  U(U&&) { }
+  U(T) { }
+};
+
+T g;
+
+T
+fn1 ()
+{
+  T t;
+  return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+}
+
+T
+fn2 ()
+{
+  // Not a local variable.
+  return std::move (g);
+}
+
+int
+fn3 ()
+{
+  int i = 42;
+  // Not a class type.
+  return std::move (i);
+}
+
+T
+fn4 (bool b)
+{
+  T t;
+  if (b)
+    throw std::move (t);
+  return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+}
+
+T
+fn5 (T t)
+{
+  // Function parameter; std::move is redundant but not pessimizing.
+  return std::move (t);
+}
+
+U
+fn6 (T t, U u, bool b)
+{
+  if (b)
+    return std::move (t);
+  else
+    // Function parameter; std::move is redundant but not pessimizing.
+    return std::move (u);
+}
+
+U
+fn6 (bool b)
+{
+  T t;
+  U u;
+  if (b)
+    return std::move (t);
+  else
+    return std::move (u); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+}
+
+T
+fn7 ()
+{
+  static T t;
+  // Non-local; don't warn.
+  return std::move (t);
+}
+
+T
+fn8 ()
+{
+  return T();
+}
+
+T
+fn9 (int i)
+{
+  T t;
+
+  switch (i)
+    {
+    case 1:
+      return std::move ((t)); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+    case 2:
+      return (std::move (t)); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+    default:
+      return (std::move ((t))); // { dg-warning "moving a local object in a return statement prevents copy elision" }
+    }
+}
+
+int
+fn10 ()
+{
+  return std::move (42);
+}