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diff --git a/libstdc++-v3/config/os/mingw32/ctype_base.h b/libstdc++-v3/config/os/mingw32/ctype_base.h
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+++ b/libstdc++-v3/config/os/mingw32/ctype_base.h
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+// Locale support -*- C++ -*-
+
+// Copyright (C) 1997, 1998, 1999, 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/>.
+
+//
+// ISO C++ 14882: 22.1  Locales
+//
+
+//  We don't use the C-locale masks defined in mingw/include/ctype.h
+//  because those masks do not conform to the requirements of 22.2.1.
+//  In particular, a separate 'print' bitmask does not exist (isprint(c)
+//  relies on a combination of flags) and the  '_ALPHA' mask is also a
+//  combination of simple bitmasks.  Thus, we define libstdc++-specific
+//  masks here, based on the generic masks, and the corresponding
+//  classic_table in ctype_noninline.h.
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+  /// @brief  Base class for ctype.
+  struct ctype_base
+  {
+    // Non-standard typedefs.
+    typedef const int* 		__to_type;
+
+    // NB: Offsets into ctype<char>::_M_table force a particular size
+    // on the mask type. Because of this, we don't use an enum.
+    typedef unsigned short 	mask;   
+    static const mask upper	= 1 << 0;
+    static const mask lower	= 1 << 1;
+    static const mask alpha	= 1 << 2;
+    static const mask digit	= 1 << 3;
+    static const mask xdigit	= 1 << 4;
+    static const mask space	= 1 << 5;
+    static const mask print	= 1 << 6;
+    static const mask graph	= (1 << 2) | (1 << 3) | (1 << 9);  // alnum|punct
+    static const mask cntrl	= 1 << 8;
+    static const mask punct 	= 1 << 9;
+    static const mask alnum	= (1 << 2) | (1 << 3);  // alpha|digit
+  };
+
+_GLIBCXX_END_NAMESPACE