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diff --git a/libstdc++-v3/include/ext/type_traits.h b/libstdc++-v3/include/ext/type_traits.h
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+++ b/libstdc++-v3/include/ext/type_traits.h
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2009 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 ext/type_traits.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _EXT_TYPE_TRAITS
+#define _EXT_TYPE_TRAITS 1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+#include <bits/cpp_type_traits.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  // Define a nested type if some predicate holds.
+  template<bool, typename>
+    struct __enable_if 
+    { };
+
+  template<typename _Tp>
+    struct __enable_if<true, _Tp>
+    { typedef _Tp __type; };
+
+
+  // Conditional expression for types. If true, first, if false, second.
+  template<bool _Cond, typename _Iftrue, typename _Iffalse>
+    struct __conditional_type
+    { typedef _Iftrue __type; };
+
+  template<typename _Iftrue, typename _Iffalse>
+    struct __conditional_type<false, _Iftrue, _Iffalse>
+    { typedef _Iffalse __type; };
+
+
+  // Given an integral builtin type, return the corresponding unsigned type.
+  template<typename _Tp>
+    struct __add_unsigned
+    { 
+    private:
+      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
+      
+    public:
+      typedef typename __if_type::__type __type; 
+    };
+
+  template<>
+    struct __add_unsigned<char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __add_unsigned<signed char>
+    { typedef unsigned char __type; };
+
+  template<>
+    struct __add_unsigned<short>
+    { typedef unsigned short __type; };
+
+  template<>
+    struct __add_unsigned<int>
+    { typedef unsigned int __type; };
+
+  template<>
+    struct __add_unsigned<long>
+    { typedef unsigned long __type; };
+
+  template<>
+    struct __add_unsigned<long long>
+    { typedef unsigned long long __type; };
+
+  // Declare but don't define.
+  template<>
+    struct __add_unsigned<bool>;
+
+  template<>
+    struct __add_unsigned<wchar_t>;
+
+
+  // Given an integral builtin type, return the corresponding signed type.
+  template<typename _Tp>
+    struct __remove_unsigned
+    { 
+    private:
+      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
+      
+    public:
+      typedef typename __if_type::__type __type; 
+    };
+
+  template<>
+    struct __remove_unsigned<char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned char>
+    { typedef signed char __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned short>
+    { typedef short __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned int>
+    { typedef int __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned long>
+    { typedef long __type; };
+
+  template<>
+    struct __remove_unsigned<unsigned long long>
+    { typedef long long __type; };
+
+  // Declare but don't define.
+  template<>
+    struct __remove_unsigned<bool>;
+
+  template<>
+    struct __remove_unsigned<wchar_t>;
+
+
+  // For use in string and vstring.
+  template<typename _Type>
+    inline bool
+    __is_null_pointer(_Type* __ptr)
+    { return __ptr == 0; }
+
+  template<typename _Type>
+    inline bool
+    __is_null_pointer(_Type)
+    { return false; }
+
+
+  // For complex and cmath
+  template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
+    struct __promote
+    { typedef double __type; };
+
+  template<typename _Tp>
+    struct __promote<_Tp, false>
+    { typedef _Tp __type; };
+
+  template<typename _Tp, typename _Up>
+    struct __promote_2
+    {
+    private:
+      typedef typename __promote<_Tp>::__type __type1;
+      typedef typename __promote<_Up>::__type __type2;
+
+    public:
+      typedef __typeof__(__type1() + __type2()) __type;
+    };
+
+  template<typename _Tp, typename _Up, typename _Vp>
+    struct __promote_3
+    {
+    private:
+      typedef typename __promote<_Tp>::__type __type1;
+      typedef typename __promote<_Up>::__type __type2;
+      typedef typename __promote<_Vp>::__type __type3;
+
+    public:
+      typedef __typeof__(__type1() + __type2() + __type3()) __type;
+    };
+
+  template<typename _Tp, typename _Up, typename _Vp, typename _Wp>
+    struct __promote_4
+    {
+    private:
+      typedef typename __promote<_Tp>::__type __type1;
+      typedef typename __promote<_Up>::__type __type2;
+      typedef typename __promote<_Vp>::__type __type3;
+      typedef typename __promote<_Wp>::__type __type4;
+
+    public:
+      typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type;
+    };
+
+_GLIBCXX_END_NAMESPACE
+
+#endif