[patch] Backport fixes for allocator handling in std::vector move assign

[Jonathan Wakely]

This patch backports the important parts of three commits from trunk
to the 4.8 branch.

Tested x86_64-linux, committed to the 4.8 branch.

-------------- next part --------------
commit 48a2f3af4fcff86695e6f12c1490833f5679ad44
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Mar 11 18:20:47 2014 +0000

    	Backport from mainline.
    
    	2014-01-09  Jonathan Wakely  <jwakely@redhat.com>
    
    	PR libstdc++/59738
    	* include/bits/stl_vector.h (vector<>::_M_move_assign): Restore
    	support for non-Movable types.
    
    	2014-01-08  Fran??ois Dumont  <fdumont@gcc.gnu.org>
    
    	* include/bits/stl_vector.h (std::vector<>::_M_move_assign): Pass
    	*this allocator instance when building temporary vector instance
    	so that *this allocator does not get moved.
    	* testsuite/23_containers/vector/allocator/move.cc (test01): Add
    	check on a vector iterator.
    	* testsuite/23_containers/vector/allocator/move_assign.cc
    	(test02): Likewise.
    	(test03): New, test with a non-propagating allocator.
    
    	2013-11-15  Jonathan Wakely  <jwakely.gcc@gmail.com>
    
    	* testsuite/23_containers/vector/allocator/move.cc: New

diff --git a/libstdc++-v3/include/bits/stl_vector.h b/libstdc++-v3/include/bits/stl_vector.h
index 69c6e27..14de461 100644
--- a/libstdc++-v3/include/bits/stl_vector.h
+++ b/libstdc++-v3/include/bits/stl_vector.h
@@ -1361,7 +1361,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       void
       _M_move_assign(vector&& __x, std::true_type) noexcept
       {
-	const vector __tmp(std::move(*this));
+	vector __tmp(get_allocator());
+	this->_M_impl._M_swap_data(__tmp._M_impl);
 	this->_M_impl._M_swap_data(__x._M_impl);
 	if (_Alloc_traits::_S_propagate_on_move_assign())
 	  std::__alloc_on_move(_M_get_Tp_allocator(),
diff --git a/libstdc++-v3/testsuite/23_containers/vector/allocator/move.cc b/libstdc++-v3/testsuite/23_containers/vector/allocator/move.cc
new file mode 100644
index 0000000..7e62f1e
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/vector/allocator/move.cc
@@ -0,0 +1,59 @@
+// Copyright (C) 2013 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/>.
+
+// { dg-options "-std=gnu++11" }
+
+#include <vector>
+#include <testsuite_hooks.h>
+#include <testsuite_allocator.h>
+
+struct T { int i; };
+
+using __gnu_test::uneq_allocator;
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  typedef uneq_allocator<T> alloc_type;
+  typedef std::vector<T, alloc_type> test_type;
+  test_type v1(alloc_type(1));
+  v1 = { T() };
+  auto it = v1.begin();
+  test_type v2(std::move(v1));
+  VERIFY(1 == v1.get_allocator().get_personality());
+  VERIFY(1 == v2.get_allocator().get_personality());
+  VERIFY( it == v2.begin() );
+}
+
+void test02()
+{
+  bool test __attribute__((unused)) = true;
+  typedef uneq_allocator<T> alloc_type;
+  typedef std::vector<T, alloc_type> test_type;
+  test_type v1(alloc_type(1));
+  v1 = { T() };
+  test_type v2(std::move(v1), alloc_type(2));
+  VERIFY(1 == v1.get_allocator().get_personality());
+  VERIFY(2 == v2.get_allocator().get_personality());
+}
+
+int main()
+{
+  test01();
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/vector/allocator/move_assign.cc b/libstdc++-v3/testsuite/23_containers/vector/allocator/move_assign.cc
index 64795d3..42dec6d 100644
--- a/libstdc++-v3/testsuite/23_containers/vector/allocator/move_assign.cc
+++ b/libstdc++-v3/testsuite/23_containers/vector/allocator/move_assign.cc
@@ -46,16 +46,35 @@ void test02()
   typedef std::vector<T, alloc_type> test_type;
   test_type v1(alloc_type(1));
   v1.push_back(T());
+  auto it = v1.begin();
   test_type v2(alloc_type(2));
-  v2 = std::move(v1);
   v2.push_back(T());
+  v2 = std::move(v1);
+  VERIFY( it == v2.begin() );
   VERIFY(0 == v1.get_allocator().get_personality());
   VERIFY(1 == v2.get_allocator().get_personality());
 }
 
+void test03()
+{
+  bool test __attribute__((unused)) = true;
+  typedef propagating_allocator<T, false> alloc_type;
+  typedef std::vector<T, alloc_type> test_type;
+  test_type v1(alloc_type(1));
+  v1.push_back(T());
+  auto it = v1.begin();
+  test_type v2(alloc_type(1));
+  v2.push_back(T());
+  v2 = std::move(v1);
+  VERIFY( it == v2.begin() );
+  VERIFY(1 == v1.get_allocator().get_personality());
+  VERIFY(1 == v2.get_allocator().get_personality());
+}
+
 int main()
 {
   test01();
   test02();
+  test03();
   return 0;
 }