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diff --git a/src/google/protobuf/stubs/pbconfig.h b/src/google/protobuf/stubs/pbconfig.h
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-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__
-#define GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__
-
-#define GOOGLE_PROTOBUF_HAVE_HASH_MAP 1
-#define GOOGLE_PROTOBUF_HAVE_HASH_SET 1
-
-// Use C++11 unordered_{map|set} if available.
-#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X)
-# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
-
-// For XCode >= 4.6: the compiler is clang with libc++.
-// For earlier XCode version: the compiler is gcc-4.2.1 with libstdc++.
-// libc++ provides <unordered_map> and friends even in non C++11 mode,
-// and it does not provide the tr1 library. Therefore the following macro
-// checks against this special case.
-// Note that we should not test the __APPLE_CC__ version number or the
-// __clang__ macro, since the new compiler can still use -stdlib=libstdc++, in
-// which case <unordered_map> is not compilable without -std=c++11
-#elif defined(__APPLE_CC__)
-# if defined(_LIBCPP_VERSION)
-# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
-# elif __GNUC__ >= 4
-# define GOOGLE_PROTOBUF_HAS_TR1
-# else
-// Not tested for gcc < 4... These setting can compile under 4.2.1 though.
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE __gnu_cxx
-# define GOOGLE_PROTOBUF_HASH_MAP_H <ext/hash_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <ext/hash_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
-# endif
-
-// Version checks for gcc.
-#elif defined(__GNUC__)
-// For GCC 4.x+, use tr1::unordered_map/set; otherwise, follow the
-// instructions from:
-// https://gcc.gnu.org/onlinedocs/libstdc++/manual/backwards.html
-# if __GNUC__ >= 4
-# define GOOGLE_PROTOBUF_HAS_TR1
-# elif __GNUC__ >= 3
-# define GOOGLE_PROTOBUF_HASH_MAP_H <backward/hash_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <backward/hash_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
-# if __GNUC__ == 3 && __GNUC_MINOR__ == 0
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE std // GCC 3.0
-# else
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE __gnu_cxx // GCC 3.1 and later
-# endif
-# else
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE
-# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
-# endif
-
-// Version checks for MSC.
-// Apparently Microsoft decided to move hash_map *back* to the std namespace in
-// MSVC 2010:
-// http://blogs.msdn.com/vcblog/archive/2009/05/25/stl-breaking-changes-in-visual-studio-2010-beta-1.aspx
-// And.. they are moved back to stdext in MSVC 2013 (haven't checked 2012). That
-// said, use unordered_map for MSVC 2010 and beyond is our safest bet.
-#elif defined(_MSC_VER)
-# if _MSC_VER >= 1600 // Since Visual Studio 2010
-# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
-# define GOOGLE_PROTOBUF_HASH_COMPARE std::hash_compare
-# elif _MSC_VER >= 1500 // Since Visual Studio 2008
-# define GOOGLE_PROTOBUF_HAS_TR1
-# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
-# elif _MSC_VER >= 1310
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE stdext
-# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
-# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
-# else
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE std
-# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
-# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
-# endif
-
-// **ADD NEW COMPILERS SUPPORT HERE.**
-// For other compilers, undefine the macro and fallback to use std::map, in
-// google/protobuf/stubs/hash.h
-#else
-# undef GOOGLE_PROTOBUF_HAVE_HASH_MAP
-# undef GOOGLE_PROTOBUF_HAVE_HASH_SET
-#endif
-
-#if defined(GOOGLE_PROTOBUF_HAS_CXX11_HASH)
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE std
-# define GOOGLE_PROTOBUF_HASH_MAP_H <unordered_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS unordered_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <unordered_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS unordered_set
-#elif defined(GOOGLE_PROTOBUF_HAS_TR1)
-# define GOOGLE_PROTOBUF_HASH_NAMESPACE std::tr1
-# define GOOGLE_PROTOBUF_HASH_MAP_H <tr1/unordered_map>
-# define GOOGLE_PROTOBUF_HASH_MAP_CLASS unordered_map
-# define GOOGLE_PROTOBUF_HASH_SET_H <tr1/unordered_set>
-# define GOOGLE_PROTOBUF_HASH_SET_CLASS unordered_set
-#endif
-
-#undef GOOGLE_PROTOBUF_HAS_CXX11_HASH
-#undef GOOGLE_PROTOBUF_HAS_TR1
-
-#endif // GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__