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diff --git a/contrib/libstdc++/config/os/aix/bits/os_defines.h b/contrib/libstdc++/config/os/aix/bits/os_defines.h
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+// Specific definitions for AIX -*- C++ -*-
+
+// Copyright (C) 2000 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 2, 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 COPYING. If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction. Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License. This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#ifndef _GLIBCPP_OS_DEFINES
+#define _GLIBCPP_OS_DEFINES
+
+// System-specific #define, typedefs, corrections, etc, go here. This
+// file will come before all others.
+
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+#undef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED 1
+
+// off64_t
+#ifndef _LARGE_FILE_API
+#define _LARGE_FILE_API
+#endif
+
+// atomic types
+#ifndef _ALL_SOURCE
+#define _ALL_SOURCE
+#endif
+
+#define __off_t off_t
+#define __off64_t off64_t
+#define __ssize_t ssize_t
+
+#undef _G_USING_THUNKS
+#define _G_USING_THUNKS 0
+
+#if !defined(_AIX51) || !defined(__64BIT__)
+#define __glibcpp_wchar_t_bits 16
+#define __glibcpp_wchar_t_is_signed false
+#endif
+
+#ifdef __64BIT__
+#define __glibcpp_long_bits 64
+#endif
+
+#endif
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