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diff --git a/libstdc++-v3/config/cpu/generic/cxxabi_tweaks.h b/libstdc++-v3/config/cpu/generic/cxxabi_tweaks.h
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+++ b/libstdc++-v3/config/cpu/generic/cxxabi_tweaks.h
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+// Control various target specific ABI tweaks.  Generic version.
+
+// Copyright (C) 2004, 2006, 2008, 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 cxxabi_tweaks.h
+ *  The header provides an CPU-variable interface to the C++ ABI.
+ */
+
+#ifndef _CXXABI_TWEAKS_H
+#define _CXXABI_TWEAKS_H 1
+
+#ifdef __cplusplus
+namespace __cxxabiv1
+{
+  extern "C" 
+  {
+#endif
+
+  // The generic ABI uses the first byte of a 64-bit guard variable.
+#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
+#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
+#define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
+#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
+#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
+  __extension__ typedef int __guard __attribute__((mode (__DI__)));
+
+  // __cxa_vec_ctor has void return type.
+  typedef void __cxa_vec_ctor_return_type;
+#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
+  // Constructors and destructors do not return a value.
+  typedef void __cxa_cdtor_return_type;
+
+#ifdef __cplusplus
+  }
+} // namespace __cxxabiv1
+#endif
+
+#endif