Hi,

tested x86_64-linux multilib + debug-mode, committed to mainline (see
Audit trail for details)

Thanks,
Paolo.

////////////////////////
2011-03-09  Paolo Carlini  <paolo.carl...@oracle.com>

        * testsuite/util/testsuite_rvalref.h: Minor tweaks.

2011-03-09  Jonathan Wakely  <r...@gcc.gnu.org>
            Chris Jefferson  <ch...@bubblescope.net>
            Paolo Carlini  <paolo.carl...@oracle.com>

        * testsuite/util/testsuite_rvalref.h (rvalstruct_compare_by_value):
        New.
        * testsuite/25_algorithms/sort_heap/check_compare_by_value.cc:
        Likewise.
        * testsuite/25_algorithms/partial_sort/check_compare_by_value:
        Likewise.
        * testsuite/25_algorithms/stable_sort/check_compare_by_value.cc:
        Likewise.
        * testsuite/25_algorithms/sort/check_compare_by_value: Likewise.

2011-03-09  Chris Jefferson  <ch...@bubblescope.net>

        PR libstdc++/48038
        * include/bits/stl_algo.h (__merge_backward): Rename to
        __move_merge_backward and change to always move rather than copy.
        (__move_merge): New function similar to std::merge except values
        are moved instead of copied.
        (__merge_adaptive, __merge_sort_loop): Change from using std::merge
        and __merge_backward to __move_merge and __move_merge_backward.
Index: include/bits/stl_algo.h
===================================================================
--- include/bits/stl_algo.h     (revision 170820)
+++ include/bits/stl_algo.h     (working copy)
@@ -2720,32 +2720,32 @@
   template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
           typename _BidirectionalIterator3>
     _BidirectionalIterator3
-    __merge_backward(_BidirectionalIterator1 __first1,
-                    _BidirectionalIterator1 __last1,
-                    _BidirectionalIterator2 __first2,
-                    _BidirectionalIterator2 __last2,
-                    _BidirectionalIterator3 __result)
+    __move_merge_backward(_BidirectionalIterator1 __first1,
+                         _BidirectionalIterator1 __last1,
+                         _BidirectionalIterator2 __first2,
+                         _BidirectionalIterator2 __last2,
+                         _BidirectionalIterator3 __result)
     {
       if (__first1 == __last1)
-       return std::copy_backward(__first2, __last2, __result);
+       return _GLIBCXX_MOVE_BACKWARD3(__first2, __last2, __result);
       if (__first2 == __last2)
-       return std::copy_backward(__first1, __last1, __result);
+       return _GLIBCXX_MOVE_BACKWARD3(__first1, __last1, __result);
       --__last1;
       --__last2;
       while (true)
        {
          if (*__last2 < *__last1)
            {
-             *--__result = *__last1;
+             *--__result = _GLIBCXX_MOVE(*__last1);
              if (__first1 == __last1)
-               return std::copy_backward(__first2, ++__last2, __result);
+               return _GLIBCXX_MOVE_BACKWARD3(__first2, ++__last2, __result);
              --__last1;
            }
          else
            {
-             *--__result = *__last2;
+             *--__result = _GLIBCXX_MOVE(*__last2);
              if (__first2 == __last2)
-               return std::copy_backward(__first1, ++__last1, __result);
+               return _GLIBCXX_MOVE_BACKWARD3(__first1, ++__last1, __result);
              --__last2;
            }
        }
@@ -2755,39 +2755,94 @@
   template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
           typename _BidirectionalIterator3, typename _Compare>
     _BidirectionalIterator3
-    __merge_backward(_BidirectionalIterator1 __first1,
-                    _BidirectionalIterator1 __last1,
-                    _BidirectionalIterator2 __first2,
-                    _BidirectionalIterator2 __last2,
-                    _BidirectionalIterator3 __result,
-                    _Compare __comp)
+    __move_merge_backward(_BidirectionalIterator1 __first1,
+                         _BidirectionalIterator1 __last1,
+                         _BidirectionalIterator2 __first2,
+                         _BidirectionalIterator2 __last2,
+                         _BidirectionalIterator3 __result,
+                         _Compare __comp)
     {
       if (__first1 == __last1)
-       return std::copy_backward(__first2, __last2, __result);
+       return _GLIBCXX_MOVE_BACKWARD3(__first2, __last2, __result);
       if (__first2 == __last2)
-       return std::copy_backward(__first1, __last1, __result);
+       return _GLIBCXX_MOVE_BACKWARD3(__first1, __last1, __result);
       --__last1;
       --__last2;
       while (true)
        {
          if (__comp(*__last2, *__last1))
            {
-             *--__result = *__last1;
+             *--__result = _GLIBCXX_MOVE(*__last1);
              if (__first1 == __last1)
-               return std::copy_backward(__first2, ++__last2, __result);
+               return _GLIBCXX_MOVE_BACKWARD3(__first2, ++__last2, __result);
              --__last1;
            }
          else
            {
-             *--__result = *__last2;
+             *--__result = _GLIBCXX_MOVE(*__last2);
              if (__first2 == __last2)
-               return std::copy_backward(__first1, ++__last1, __result);
+               return _GLIBCXX_MOVE_BACKWARD3(__first1, ++__last1, __result);
              --__last2;
            }
        }
     }
 
   /// This is a helper function for the merge routines.
+  template<typename _InputIterator1, typename _InputIterator2,
+          typename _OutputIterator>
+    _OutputIterator
+    __move_merge(_InputIterator1 __first1, _InputIterator1 __last1,
+                _InputIterator2 __first2, _InputIterator2 __last2,
+                _OutputIterator __result)
+    {
+      while (__first1 != __last1 && __first2 != __last2)
+       {
+         if (*__first2 < *__first1)
+           {
+             *__result = _GLIBCXX_MOVE(*__first2);
+             ++__first2;
+           }
+         else
+           {
+             *__result = _GLIBCXX_MOVE(*__first1);
+             ++__first1;
+           }
+         ++__result;
+       }
+      return _GLIBCXX_MOVE3(__first2, __last2,
+                           _GLIBCXX_MOVE3(__first1, __last1,
+                                          __result));
+    }
+
+  /// This is a helper function for the merge routines.
+  template<typename _InputIterator1, typename _InputIterator2,
+          typename _OutputIterator, typename _Compare>
+    _OutputIterator
+    __move_merge(_InputIterator1 __first1, _InputIterator1 __last1,
+                _InputIterator2 __first2, _InputIterator2 __last2,
+                _OutputIterator __result, _Compare __comp)
+    {
+      while (__first1 != __last1 && __first2 != __last2)
+       {
+         if (__comp(*__first2, *__first1))
+           {
+             *__result = _GLIBCXX_MOVE(*__first2);
+             ++__first2;
+           }
+         else
+           {
+             *__result = _GLIBCXX_MOVE(*__first1);
+             ++__first1;
+           }
+         ++__result;
+       }
+      return _GLIBCXX_MOVE3(__first2, __last2,
+                           _GLIBCXX_MOVE3(__first1, __last1,
+                                          __result));
+    }
+
+
+  /// This is a helper function for the merge routines.
   template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
           typename _Distance>
     _BidirectionalIterator1
@@ -2832,20 +2887,13 @@
       if (__len1 <= __len2 && __len1 <= __buffer_size)
        {
          _Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
-         _GLIBCXX_STD_A::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
-                               __first);
+         std::__move_merge(__buffer, __buffer_end, __middle, __last, __first);
        }
       else if (__len2 <= __buffer_size)
        {
          _Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
-         std::__merge_backward(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
-                               __last);
+         std::__move_merge_backward(__first, __middle, __buffer,
+                                   __buffer_end, __last);
        }
       else
        {
@@ -2895,20 +2943,14 @@
       if (__len1 <= __len2 && __len1 <= __buffer_size)
        {
          _Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
-         _GLIBCXX_STD_A::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
-                               __first, __comp);
+         std::__move_merge(__buffer, __buffer_end, __middle, __last,
+                           __first, __comp);
        }
       else if (__len2 <= __buffer_size)
        {
          _Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
-         std::__merge_backward(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
-                               _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
-                               __last,__comp);
+         std::__move_merge_backward(__first, __middle, __buffer, __buffer_end,
+                                    __last, __comp);
        }
       else
        {
@@ -3157,23 +3199,15 @@
 
       while (__last - __first >= __two_step)
        {
-         __result = _GLIBCXX_STD_A::merge(
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __two_step),
-                       __result);
+         __result = std::__move_merge(__first, __first + __step_size,
+                                      __first + __step_size,
+                                      __first + __two_step, __result);
          __first += __two_step;
        }
 
       __step_size = std::min(_Distance(__last - __first), __step_size);
-      _GLIBCXX_STD_A::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
-                                                       __step_size),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
-                                                       __step_size),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
-                           __result);
+      std::__move_merge(__first, __first + __step_size,
+                       __first + __step_size, __last, __result);
     }
 
   template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
@@ -3188,23 +3222,16 @@
 
       while (__last - __first >= __two_step)
        {
-         __result = _GLIBCXX_STD_A::merge(
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
-                       _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __two_step),
-                       __result, __comp);
+         __result = std::__move_merge(__first, __first + __step_size,
+                                      __first + __step_size,
+                                      __first + __two_step,
+                                      __result, __comp);
          __first += __two_step;
        }
       __step_size = std::min(_Distance(__last - __first), __step_size);
 
-      _GLIBCXX_STD_A::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
-                                                       __step_size),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
-                                                       __step_size),
-                           _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
-                           __result, __comp);
+      std::__move_merge(__first,__first + __step_size,
+                       __first + __step_size, __last, __result, __comp);
     }
 
   template<typename _RandomAccessIterator, typename _Distance>
Index: testsuite/25_algorithms/sort_heap/check_compare_by_value.cc
===================================================================
--- testsuite/25_algorithms/sort_heap/check_compare_by_value.cc (revision 0)
+++ testsuite/25_algorithms/sort_heap/check_compare_by_value.cc (revision 0)
@@ -0,0 +1,88 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#undef _GLIBCXX_CONCEPT_CHECKS
+
+// XXX FIXME:  parallel-mode should deal correctly with moveable-only types
+// per C++0x, at minimum smoothly fall back to serial.
+#undef _GLIBCXX_PARALLEL
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+#include <testsuite_rvalref.h>
+
+using __gnu_test::test_container;
+using __gnu_test::random_access_iterator_wrapper;
+
+typedef __gnu_test::rvalstruct_compare_by_value V;
+typedef test_container<V, random_access_iterator_wrapper> Container;
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::make_heap(con.begin(), con.end());
+  std::sort_heap(con.begin(), con.end());
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+}
+
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::make_heap(con.begin(), con.end(), __gnu_test::order);
+  std::sort_heap(con.begin(), con.end(), __gnu_test::order);
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+}
+
+void
+test03()
+{
+  bool test __attribute__((unused)) = true;
+
+  V vvs[] = { 2, 0 };
+  std::make_heap(vvs, vvs + 2);
+  std::sort_heap(vvs, vvs + 2);
+  VERIFY( vvs[0].ok && vvs[0].val == 0 );
+  VERIFY( vvs[1].ok && vvs[1].val == 2 );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  test03();
+  return 0;
+}
Index: testsuite/25_algorithms/partial_sort/check_compare_by_value.cc
===================================================================
--- testsuite/25_algorithms/partial_sort/check_compare_by_value.cc      
(revision 0)
+++ testsuite/25_algorithms/partial_sort/check_compare_by_value.cc      
(revision 0)
@@ -0,0 +1,93 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 25.3.1.3 [lib.partial.sort]
+
+#undef _GLIBCXX_CONCEPT_CHECKS
+
+// XXX FIXME:  parallel-mode should deal correctly with moveable-only types
+// per C++0x, at minimum smoothly fall back to serial.
+#undef _GLIBCXX_PARALLEL
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+#include <testsuite_rvalref.h>
+
+using __gnu_test::test_container;
+using __gnu_test::random_access_iterator_wrapper;
+
+typedef __gnu_test::rvalstruct_compare_by_value V;
+typedef test_container<V, random_access_iterator_wrapper> Container;
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::partial_sort(con.begin(), con.begin() + 10, con.end());
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < 10; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+  for(int i = 10; i < N; ++i)
+    VERIFY( s1[i].val > s1[9].val && s1[i].ok );
+
+}
+
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::partial_sort(con.begin(), con.begin() + 10, con.end(),
+                   __gnu_test::order);
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < 10; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+  for(int i = 10; i < N; ++i)
+    VERIFY( s1[i].val > s1[9].val && s1[i].ok );
+}
+
+void
+test03()
+{
+  bool test __attribute__((unused)) = true;
+
+  V vvs[] = { 2, 0 };
+  std::partial_sort(vvs, vvs + 2, vvs + 2);
+  VERIFY( vvs[0].ok && vvs[0].val == 0 );
+  VERIFY( vvs[1].ok && vvs[1].val == 2 );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  test03();
+  return 0;
+}
Index: testsuite/25_algorithms/stable_sort/check_compare_by_value.cc
===================================================================
--- testsuite/25_algorithms/stable_sort/check_compare_by_value.cc       
(revision 0)
+++ testsuite/25_algorithms/stable_sort/check_compare_by_value.cc       
(revision 0)
@@ -0,0 +1,90 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 25.3.1.2 [lib.stable.sort]
+
+#undef _GLIBCXX_CONCEPT_CHECKS
+
+// XXX FIXME:  parallel-mode should deal correctly with moveable-only types
+// per C++0x, at minimum smoothly fall back to serial.
+#undef _GLIBCXX_PARALLEL
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+#include <testsuite_rvalref.h>
+
+using __gnu_test::test_container;
+using __gnu_test::random_access_iterator_wrapper;
+
+typedef __gnu_test::rvalstruct_compare_by_value V;
+typedef test_container<V, random_access_iterator_wrapper> Container;
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::stable_sort(con.begin(), con.end());
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+  {
+    VERIFY( s1[i].val > s1[i - 1].val);
+    VERIFY( s1[i].ok );
+  }
+}
+
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::stable_sort(con.begin(), con.end(), __gnu_test::order);
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+}
+
+void
+test03()
+{
+  bool test __attribute__((unused)) = true;
+
+  V vvs[] = { 2, 0 };
+  std::stable_sort(vvs, vvs + 2);
+  VERIFY( vvs[0].ok && vvs[0].val == 0 );
+  VERIFY( vvs[1].ok && vvs[1].val == 2 );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  test03();
+  return 0;
+}
Index: testsuite/25_algorithms/sort/check_compare_by_value.cc
===================================================================
--- testsuite/25_algorithms/sort/check_compare_by_value.cc      (revision 0)
+++ testsuite/25_algorithms/sort/check_compare_by_value.cc      (revision 0)
@@ -0,0 +1,86 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 25.3.1 algorithms, sort
+
+#undef _GLIBCXX_CONCEPT_CHECKS
+
+// XXX FIXME:  parallel-mode should deal correctly with moveable-only types
+// per C++0x, at minimum smoothly fall back to serial.
+#undef _GLIBCXX_PARALLEL
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+#include <testsuite_rvalref.h>
+
+using __gnu_test::test_container;
+using __gnu_test::random_access_iterator_wrapper;
+
+typedef __gnu_test::rvalstruct_compare_by_value V;
+typedef test_container<V, random_access_iterator_wrapper> Container;
+
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::sort(con.begin(), con.end());
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+}
+
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+
+  V s1[] = { 10, 20, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 
+            17, 8, 18, 9, 19 };
+  const int N = sizeof(s1) / sizeof(V);
+  Container con(s1, s1 + N);
+  std::sort(con.begin(), con.end(), __gnu_test::order);
+  VERIFY( s1[0].ok );
+  for(int i = 1; i < N; ++i)
+    VERIFY( s1[i].val > s1[i - 1].val && s1[i].ok );
+}
+
+void test03()
+{
+  bool test __attribute__((unused)) = true;
+
+  V vvs[] = { 2, 0 };
+  std::sort(vvs, vvs + 2);
+  VERIFY( vvs[0].ok && vvs[0].val == 0 );
+  VERIFY( vvs[1].ok && vvs[1].val == 2 );
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  test03();
+  return 0;
+}
Index: testsuite/util/testsuite_rvalref.h
===================================================================
--- testsuite/util/testsuite_rvalref.h  (revision 170820)
+++ testsuite/util/testsuite_rvalref.h  (working copy)
@@ -24,10 +24,10 @@
 #define _GLIBCXX_TESTSUITE_RVALREF_H 1
 
 #include <testsuite_hooks.h>
+#include <bits/functional_hash.h>
 
 namespace __gnu_test
 {
-
   // This class is designed to test libstdc++'s template-based rvalue
   // reference support. It should fail at compile-time if there is an
   // attempt to copy it.
@@ -53,8 +53,9 @@
     rvalstruct(const rvalstruct&) = delete;
 
     rvalstruct(rvalstruct&& in)
-    { 
-      VERIFY(in.valid == true);
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( in.valid == true );
       val = in.val;
       in.valid = false;
       valid = true;
@@ -65,8 +66,9 @@
 
     rvalstruct&
     operator=(rvalstruct&& in)
-    { 
-      VERIFY(in.valid == true);
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( in.valid == true );
       val = in.val;
       in.valid = false;
       valid = true;
@@ -84,8 +86,9 @@
 
   void
   swap(rvalstruct& lhs, rvalstruct& rhs)
-  {  
-    VERIFY(lhs.valid && rhs.valid);
+  {
+    bool test __attribute__((unused)) = true;
+    VERIFY( lhs.valid && rhs.valid );
     int temp = lhs.val;
     lhs.val = rhs.val;
     rhs.val = temp;
@@ -108,14 +111,16 @@
     { }
 
     copycounter(const copycounter& in) : val(in.val), valid(true)
-    { 
-      VERIFY(in.valid == true);
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( in.valid == true );
       ++copycount;
     }
 
     copycounter(copycounter&& in)
-    { 
-      VERIFY(in.valid == true);
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( in.valid == true );
       val = in.val;
       in.valid = false;
       valid = true;
@@ -131,8 +136,9 @@
 
     bool
     operator=(const copycounter& in) 
-    { 
-      VERIFY(in.valid == true);
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( in.valid == true );
       ++copycount;
       val = in.val;
       valid = true;
@@ -141,7 +147,8 @@
 
     copycounter&
     operator=(copycounter&& in)
-    { 
+    {
+      bool test __attribute__((unused)) = true;
       VERIFY(in.valid == true);
       val = in.val;
       in.valid = false;
@@ -165,22 +172,85 @@
 
   inline void
   swap(copycounter& lhs, copycounter& rhs)
-  {  
-    VERIFY(lhs.valid && rhs.valid);
+  {
+    bool test __attribute__((unused)) = true;
+    VERIFY( lhs.valid && rhs.valid );
     int temp = lhs.val;
     lhs.val = rhs.val;
     rhs.val = temp;
   }
-  
-} // namespace __gnu_test
 
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+  // In the occasion of libstdc++/48038.
+  struct rvalstruct_compare_by_value
+  {
+    int val;
+    bool ok;
 
-#include <bits/functional_hash.h>
+    rvalstruct_compare_by_value(int v)
+    : val(v), ok(true) { }
 
+    rvalstruct_compare_by_value(const rvalstruct_compare_by_value& rh)
+    : val(rh.val), ok(rh.ok)
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY(rh.ok);
+    }
+
+    rvalstruct_compare_by_value&
+    operator=(const rvalstruct_compare_by_value& rh)
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( rh.ok );
+      val = rh.val;
+      ok = rh.ok;
+      return *this;
+    }
+
+    rvalstruct_compare_by_value(rvalstruct_compare_by_value&& rh)
+    : val(rh.val), ok(rh.ok)
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( rh.ok );
+      rh.ok = false;
+    }
+
+    rvalstruct_compare_by_value&
+    operator=(rvalstruct_compare_by_value&& rh)
+    {
+      bool test __attribute__((unused)) = true;
+      VERIFY( rh.ok );
+      val = rh.val;
+      ok = rh.ok;
+      rh.ok = false;
+      return *this;
+    }
+  };
+
+  inline bool
+  operator<(rvalstruct_compare_by_value lh,
+           rvalstruct_compare_by_value rh)
+  {
+    bool test __attribute__((unused)) = true;
+    VERIFY( rh.ok );
+    VERIFY( lh.ok );
+    return lh.val < rh.val;
+  }
+
+  inline bool
+  order(rvalstruct_compare_by_value lh,
+       rvalstruct_compare_by_value rh)
+  {
+    bool test __attribute__((unused)) = true;
+    VERIFY( rh.ok );
+    VERIFY( lh.ok );
+    return lh.val < rh.val;
+  }
+
+} // namespace __gnu_test
+
 namespace std
 {
-  /// std::hash specialization for type_index.
+  /// std::hash specialization for __gnu_test::rvalstruct.
   template<>
     struct hash<__gnu_test::rvalstruct>
     {
@@ -192,6 +262,5 @@
       { return __rvs.val; }
     };
 }
-#endif
 
 #endif // _GLIBCXX_TESTSUITE_TR1_H

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