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diff --git a/libstdc++-v3/include/debug/unordered_map b/libstdc++-v3/include/debug/unordered_map
new file mode 100644
index 000000000..43b1e9c29
--- /dev/null
+++ b/libstdc++-v3/include/debug/unordered_map
@@ -0,0 +1,626 @@
+// Debugging unordered_map/unordered_multimap implementation -*- C++ -*-
+
+// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+// 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file debug/unordered_map
+ *  This file is a GNU debug extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_DEBUG_UNORDERED_MAP
+#define _GLIBCXX_DEBUG_UNORDERED_MAP 1
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <bits/c++0x_warning.h>
+#else
+# include <unordered_map>
+
+#include <debug/safe_sequence.h>
+#include <debug/safe_iterator.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+namespace __debug
+{
+  /// Class std::unordered_map with safety/checking/debug instrumentation.
+  template<typename _Key, typename _Tp,
+	   typename _Hash = std::hash<_Key>,
+	   typename _Pred = std::equal_to<_Key>,
+	   typename _Alloc = std::allocator<_Key> >
+    class unordered_map
+    : public _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>,
+      public __gnu_debug::_Safe_sequence<unordered_map<_Key, _Tp, _Hash,
+						       _Pred, _Alloc> >
+    {
+      typedef _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash,
+					    _Pred, _Alloc> _Base;
+      typedef __gnu_debug::_Safe_sequence<unordered_map> _Safe_base;
+      typedef typename _Base::const_iterator _Base_const_iterator;
+      typedef typename _Base::iterator _Base_iterator;
+      typedef __gnu_debug::_Equal_to<_Base_const_iterator> _Equal;
+
+    public:
+      typedef typename _Base::size_type       size_type;
+      typedef typename _Base::hasher          hasher;
+      typedef typename _Base::key_equal       key_equal;
+      typedef typename _Base::allocator_type  allocator_type;
+
+      typedef typename _Base::key_type        key_type;
+      typedef typename _Base::value_type      value_type;
+
+      typedef __gnu_debug::_Safe_iterator<_Base_iterator,
+					  unordered_map> iterator;
+      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator,
+					  unordered_map> const_iterator;
+
+      explicit
+      unordered_map(size_type __n = 10,
+		    const hasher& __hf = hasher(),
+		    const key_equal& __eql = key_equal(),
+		    const allocator_type& __a = allocator_type())
+      : _Base(__n, __hf, __eql, __a) { }
+
+      template<typename _InputIterator>
+        unordered_map(_InputIterator __first, _InputIterator __last, 
+		      size_type __n = 0,
+		      const hasher& __hf = hasher(), 
+		      const key_equal& __eql = key_equal(), 
+		      const allocator_type& __a = allocator_type())
+	: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
+								     __last)),
+		__gnu_debug::__base(__last), __n,
+		__hf, __eql, __a), _Safe_base() { }
+
+      unordered_map(const unordered_map& __x) 
+      : _Base(__x), _Safe_base() { }
+
+      unordered_map(const _Base& __x)
+      : _Base(__x), _Safe_base() { }
+
+      unordered_map(unordered_map&& __x)
+      : _Base(std::move(__x)), _Safe_base() { }
+
+      unordered_map(initializer_list<value_type> __l,
+		    size_type __n = 0,
+		    const hasher& __hf = hasher(),
+		    const key_equal& __eql = key_equal(),
+		    const allocator_type& __a = allocator_type())
+      : _Base(__l, __n, __hf, __eql, __a), _Safe_base() { }
+
+      unordered_map&
+      operator=(const unordered_map& __x)
+      {
+	*static_cast<_Base*>(this) = __x;
+	this->_M_invalidate_all();
+	return *this;
+      }
+
+      unordered_map&
+      operator=(unordered_map&& __x)
+      {
+   	// NB: DR 1204.
+	// NB: DR 675.
+	clear();
+	swap(__x);
+	return *this;
+      }
+
+      unordered_map&
+      operator=(initializer_list<value_type> __l)
+      {
+	this->clear();
+	this->insert(__l);
+	return *this;
+      }
+
+      void
+      swap(unordered_map& __x)
+      {
+	_Base::swap(__x);
+	_Safe_base::_M_swap(__x);
+      }
+
+      void
+      clear()
+      {
+	_Base::clear();
+	this->_M_invalidate_all();
+      }
+
+      iterator 
+      begin()
+      { return iterator(_Base::begin(), this); }
+
+      const_iterator
+      begin() const
+      { return const_iterator(_Base::begin(), this); }
+
+      iterator
+      end()
+      { return iterator(_Base::end(), this); }
+
+      const_iterator
+      end() const
+      { return const_iterator(_Base::end(), this); }
+
+      const_iterator
+      cbegin() const
+      { return const_iterator(_Base::begin(), this); }
+
+      const_iterator
+      cend() const
+      { return const_iterator(_Base::end(), this); }
+
+      // local versions
+      using _Base::begin;
+      using _Base::end;
+      using _Base::cbegin;
+      using _Base::cend;
+
+      std::pair<iterator, bool>
+      insert(const value_type& __obj)
+      {
+	std::pair<_Base_iterator, bool> __res = _Base::insert(__obj);
+	return std::make_pair(iterator(__res.first, this), __res.second);
+      }
+
+      iterator
+      insert(const_iterator __hint, const value_type& __obj)
+      {
+	__glibcxx_check_insert(__hint);
+	return iterator(_Base::insert(__hint.base(), __obj), this);
+      }
+
+      template<typename _Pair, typename = typename
+	       std::enable_if<std::is_convertible<_Pair,
+						  value_type>::value>::type>
+        std::pair<iterator, bool>
+        insert(_Pair&& __obj)
+        {
+	  std::pair<_Base_iterator, bool> __res =
+	    _Base::insert(std::forward<_Pair>(__obj));
+	  return std::make_pair(iterator(__res.first, this), __res.second);
+	}
+
+      template<typename _Pair, typename = typename
+	       std::enable_if<std::is_convertible<_Pair,
+						  value_type>::value>::type>
+        iterator
+        insert(const_iterator __hint, _Pair&& __obj)
+        {
+	  __glibcxx_check_insert(__hint);
+	  return iterator(_Base::insert(__hint.base(),
+					std::forward<_Pair>(__obj)),
+			  this);
+	}
+
+      void
+      insert(std::initializer_list<value_type> __l)
+      { _Base::insert(__l); }
+
+      template<typename _InputIterator>
+        void
+        insert(_InputIterator __first, _InputIterator __last)
+        {
+	  __glibcxx_check_valid_range(__first, __last);
+	  _Base::insert(__gnu_debug::__base(__first),
+			__gnu_debug::__base(__last));
+	}
+
+      iterator
+      find(const key_type& __key)
+      { return iterator(_Base::find(__key), this); }
+
+      const_iterator
+      find(const key_type& __key) const
+      { return const_iterator(_Base::find(__key), this); }
+
+      std::pair<iterator, iterator>
+      equal_range(const key_type& __key)
+      {
+	std::pair<_Base_iterator, _Base_iterator> __res =
+	  _Base::equal_range(__key);
+	return std::make_pair(iterator(__res.first, this),
+			      iterator(__res.second, this));
+      }
+
+      std::pair<const_iterator, const_iterator>
+      equal_range(const key_type& __key) const
+      {
+	std::pair<_Base_const_iterator, _Base_const_iterator> __res =
+	  _Base::equal_range(__key);
+	return std::make_pair(const_iterator(__res.first, this),
+			      const_iterator(__res.second, this));
+      }
+
+      size_type
+      erase(const key_type& __key)
+      {
+	size_type __ret(0);
+	_Base_iterator __victim(_Base::find(__key));
+	if (__victim != _Base::end())
+	  {
+	    this->_M_invalidate_if(_Equal(__victim));
+	    _Base::erase(__victim);
+	    __ret = 1;
+	  }
+	return __ret;
+      }
+
+      iterator
+      erase(const_iterator __it)
+      {
+	__glibcxx_check_erase(__it);
+	this->_M_invalidate_if(_Equal(__it.base()));
+	return iterator(_Base::erase(__it.base()), this);
+      }
+
+      iterator
+      erase(iterator __it)
+      { return erase(const_iterator(__it)); }
+
+      iterator
+      erase(const_iterator __first, const_iterator __last)
+      {
+	__glibcxx_check_erase_range(__first, __last);
+	for (_Base_const_iterator __tmp = __first.base();
+	     __tmp != __last.base(); ++__tmp)
+	  {
+	    _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),
+				  _M_message(__gnu_debug::__msg_valid_range)
+				  ._M_iterator(__first, "first")
+				  ._M_iterator(__last, "last"));
+	    this->_M_invalidate_if(_Equal(__tmp));
+	  }
+	return iterator(_Base::erase(__first.base(),
+				     __last.base()), this);
+      }
+
+      _Base&
+      _M_base() { return *this; }
+
+      const _Base&
+      _M_base() const { return *this; }
+
+    private:
+      void
+      _M_invalidate_all()
+      {
+	typedef __gnu_debug::_Not_equal_to<_Base_const_iterator> _Not_equal;
+	this->_M_invalidate_if(_Not_equal(_Base::end()));
+      }
+    };
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline void
+    swap(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	 unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { __x.swap(__y); }
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline bool
+    operator==(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	       const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { return __x._M_equal(__y); }
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline bool
+    operator!=(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	       const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { return !(__x == __y); }
+
+
+  /// Class std::unordered_multimap with safety/checking/debug instrumentation.
+  template<typename _Key, typename _Tp,
+	   typename _Hash = std::hash<_Key>,
+	   typename _Pred = std::equal_to<_Key>,
+	   typename _Alloc = std::allocator<_Key> >
+    class unordered_multimap
+    : public _GLIBCXX_STD_C::unordered_multimap<_Key, _Tp, _Hash,
+						_Pred, _Alloc>,
+      public __gnu_debug::_Safe_sequence<unordered_multimap<_Key, _Tp, _Hash,
+							    _Pred, _Alloc> >
+    {
+      typedef _GLIBCXX_STD_C::unordered_multimap<_Key, _Tp, _Hash,
+						 _Pred, _Alloc> _Base;
+      typedef __gnu_debug::_Safe_sequence<unordered_multimap> _Safe_base;
+      typedef typename _Base::const_iterator _Base_const_iterator;
+      typedef typename _Base::iterator _Base_iterator;
+      typedef __gnu_debug::_Equal_to<_Base_const_iterator> _Equal;
+
+    public:
+      typedef typename _Base::size_type       size_type;
+      typedef typename _Base::hasher          hasher;
+      typedef typename _Base::key_equal       key_equal;
+      typedef typename _Base::allocator_type  allocator_type;
+
+      typedef typename _Base::key_type        key_type;
+      typedef typename _Base::value_type      value_type;
+
+      typedef __gnu_debug::_Safe_iterator<_Base_iterator,
+					  unordered_multimap> iterator;
+      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator,
+					  unordered_multimap> const_iterator;
+
+      explicit
+      unordered_multimap(size_type __n = 10,
+			 const hasher& __hf = hasher(),
+			 const key_equal& __eql = key_equal(),
+			 const allocator_type& __a = allocator_type())
+      : _Base(__n, __hf, __eql, __a) { }
+
+      template<typename _InputIterator>
+        unordered_multimap(_InputIterator __first, _InputIterator __last, 
+			   size_type __n = 0,
+			   const hasher& __hf = hasher(), 
+			   const key_equal& __eql = key_equal(), 
+			   const allocator_type& __a = allocator_type())
+	: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
+								     __last)),
+		__gnu_debug::__base(__last), __n,
+		__hf, __eql, __a), _Safe_base() { }
+
+      unordered_multimap(const unordered_multimap& __x) 
+      : _Base(__x), _Safe_base() { }
+
+      unordered_multimap(const _Base& __x) 
+      : _Base(__x), _Safe_base() { }
+
+      unordered_multimap(unordered_multimap&& __x) 
+      : _Base(std::move(__x)), _Safe_base() { }
+
+      unordered_multimap(initializer_list<value_type> __l,
+			 size_type __n = 0,
+			 const hasher& __hf = hasher(),
+			 const key_equal& __eql = key_equal(),
+			 const allocator_type& __a = allocator_type())
+      : _Base(__l, __n, __hf, __eql, __a), _Safe_base() { }
+
+      unordered_multimap&
+      operator=(const unordered_multimap& __x)
+      {
+	*static_cast<_Base*>(this) = __x;
+	this->_M_invalidate_all();
+	return *this;
+      }
+
+      unordered_multimap&
+      operator=(unordered_multimap&& __x)
+      {
+	// NB: DR 1204.
+	// NB: DR 675.
+	clear();
+	swap(__x);
+	return *this;
+      }
+
+      unordered_multimap&
+      operator=(initializer_list<value_type> __l)
+      {
+	this->clear();
+	this->insert(__l);
+	return *this;
+      }
+
+      void
+      swap(unordered_multimap& __x)
+      {
+	_Base::swap(__x);
+	_Safe_base::_M_swap(__x);
+      }
+
+      void
+      clear()
+      {
+	_Base::clear();
+	this->_M_invalidate_all();
+      }
+
+      iterator 
+      begin()
+      { return iterator(_Base::begin(), this); }
+
+      const_iterator
+      begin() const
+      { return const_iterator(_Base::begin(), this); }
+
+      iterator
+      end()
+      { return iterator(_Base::end(), this); }
+
+      const_iterator
+      end() const
+      { return const_iterator(_Base::end(), this); }
+
+      const_iterator
+      cbegin() const
+      { return const_iterator(_Base::begin(), this); }
+
+      const_iterator
+      cend() const
+      { return const_iterator(_Base::end(), this); }
+
+      // local versions
+      using _Base::begin;
+      using _Base::end;
+      using _Base::cbegin;
+      using _Base::cend;
+
+      iterator
+      insert(const value_type& __obj)
+      { return iterator(_Base::insert(__obj), this); }
+
+      iterator
+      insert(const_iterator __hint, const value_type& __obj)
+      {
+	__glibcxx_check_insert(__hint);
+	return iterator(_Base::insert(__hint.base(), __obj), this);
+      }
+
+      template<typename _Pair, typename = typename
+	       std::enable_if<std::is_convertible<_Pair,
+						  value_type>::value>::type>
+        iterator
+        insert(_Pair&& __obj)
+        { return iterator(_Base::insert(std::forward<_Pair>(__obj)), this); }
+
+      template<typename _Pair, typename = typename
+	       std::enable_if<std::is_convertible<_Pair,
+						  value_type>::value>::type>
+	iterator
+	insert(const_iterator __hint, _Pair&& __obj)
+	{
+	  __glibcxx_check_insert(__hint);
+	  return iterator(_Base::insert(__hint.base(),
+					std::forward<_Pair>(__obj)),
+			  this);
+	}
+
+      void
+      insert(std::initializer_list<value_type> __l)
+      { _Base::insert(__l); }
+
+      template<typename _InputIterator>
+        void
+        insert(_InputIterator __first, _InputIterator __last)
+        {
+	  __glibcxx_check_valid_range(__first, __last);
+	  _Base::insert(__gnu_debug::__base(__first),
+			__gnu_debug::__base(__last));
+	}
+
+      iterator
+      find(const key_type& __key)
+      { return iterator(_Base::find(__key), this); }
+
+      const_iterator
+      find(const key_type& __key) const
+      { return const_iterator(_Base::find(__key), this); }
+
+      std::pair<iterator, iterator>
+      equal_range(const key_type& __key)
+      {
+	std::pair<_Base_iterator, _Base_iterator> __res =
+	  _Base::equal_range(__key);
+	return std::make_pair(iterator(__res.first, this),
+			      iterator(__res.second, this));
+      }
+
+      std::pair<const_iterator, const_iterator>
+      equal_range(const key_type& __key) const
+      {
+	std::pair<_Base_const_iterator, _Base_const_iterator> __res =
+	  _Base::equal_range(__key);
+	return std::make_pair(const_iterator(__res.first, this),
+			      const_iterator(__res.second, this));
+      }
+
+      size_type
+      erase(const key_type& __key)
+      {
+	size_type __ret(0);
+	std::pair<_Base_iterator, _Base_iterator> __pair =
+	  _Base::equal_range(__key);
+	for (_Base_iterator __victim = __pair.first; __victim != __pair.second;)
+	  {
+	    this->_M_invalidate_if(_Equal(__victim));
+	    _Base::erase(__victim++);
+	    ++__ret;
+	  }
+	return __ret;
+      }
+
+      iterator
+      erase(const_iterator __it)
+      {
+	__glibcxx_check_erase(__it);
+	this->_M_invalidate_if(_Equal(__it.base()));
+	return iterator(_Base::erase(__it.base()), this);
+      }
+
+      iterator
+      erase(iterator __it)
+      { return erase(const_iterator(__it)); }
+
+      iterator
+      erase(const_iterator __first, const_iterator __last)
+      {
+	__glibcxx_check_erase_range(__first, __last);
+	for (_Base_const_iterator __tmp = __first.base();
+	     __tmp != __last.base(); ++__tmp)
+	  {
+	    _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),
+				  _M_message(__gnu_debug::__msg_valid_range)
+				  ._M_iterator(__first, "first")
+				  ._M_iterator(__last, "last"));
+	    this->_M_invalidate_if(_Equal(__tmp));
+	  }
+	return iterator(_Base::erase(__first.base(),
+				     __last.base()), this);
+      }
+
+      _Base&
+      _M_base() { return *this; }
+
+      const _Base&
+      _M_base() const { return *this; }
+
+    private:
+      void
+      _M_invalidate_all()
+      {
+	typedef __gnu_debug::_Not_equal_to<_Base_const_iterator> _Not_equal;
+	this->_M_invalidate_if(_Not_equal(_Base::end()));
+      }
+    };
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline void
+    swap(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	 unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { __x.swap(__y); }
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline bool
+    operator==(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	       const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { return __x._M_equal(__y); }
+
+  template<typename _Key, typename _Tp, typename _Hash,
+	   typename _Pred, typename _Alloc>
+    inline bool
+    operator!=(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
+	       const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
+    { return !(__x == __y); }
+
+} // namespace __debug
+} // namespace std
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif