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+//===-- llvm/ADT/hash_set - "Portable" wrapper around hash_set --*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// vim:ft=cpp
+//
+// This file provides a wrapper around the mysterious <hash_set> header file
+// that seems to move around between GCC releases into and out of namespaces at
+// will. #including this header will cause hash_set to be available in the
+// global namespace.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_HASH_SET
+#define LLVM_ADT_HASH_SET
+
+// Compiler Support Matrix
+//
+// Version Namespace Header File
+// 2.95.x :: hash_set
+// 3.0.4 std ext/hash_set
+// 3.1 __gnu_cxx ext/hash_set
+// HP aCC6 std stdex/rw/hashset.h
+// MS VC++ stdext hash_set
+
+#cmakedefine HAVE_GNU_EXT_HASH_SET
+#cmakedefine HAVE_STD_EXT_HASH_SET
+#cmakedefine HAVE_GLOBAL_HASH_SET
+#cmakedefine HAVE_RW_STDEX_HASH_SET_H
+
+// GCC versions 3.1 and later put hash_set in <ext/hash_set> and in
+// the __gnu_cxx namespace.
+#if defined(HAVE_GNU_EXT_HASH_SET)
+# include <ext/hash_set>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE __gnu_cxx
+# endif
+
+// GCC 3.0.x puts hash_set in <ext/hash_set> and in the std namespace.
+#elif defined(HAVE_STD_EXT_HASH_SET)
+# include <ext/hash_set>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE std
+# endif
+
+// Older compilers such as GCC before version 3.0 do not keep
+// extensions in the `ext' directory, and ignore the `std' namespace.
+#elif defined(HAVE_GLOBAL_HASH_SET)
+# include <hash_set>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE std
+# endif
+
+// HP aCC doesn't include an SGI-like hash_set. For this platform (or
+// any others using Rogue Wave Software's Tools.h++ library), we wrap
+// around them in std::
+#elif defined(HAVE_RW_STDEX_HASH_SET_H)
+# include <rw/stdex/hashset.h>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE std
+# endif
+
+// Support Microsoft VC++.
+#elif defined(_MSC_VER)
+# include <hash_set>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE stdext
+# endif
+
+// Give a warning if we couldn't find it, instead of (or in addition to)
+// randomly doing something dumb.
+#else
+# warning "Autoconfiguration failed to find the hash_set header file."
+#endif
+
+// we wrap Rogue Wave Tools.h++ rw_hashset into something SGI-looking, here:
+#ifdef HAVE_RW_STDEX_HASH_SET_H
+namespace HASH_NAMESPACE {
+
+/*
+template <class DataType> struct hash {
+ unsigned int operator()(const unsigned int& x) const {
+ return x;
+ }
+};
+*/
+
+template <typename ValueType,
+ class _HashFcn = hash<ValueType>,
+ class _EqualKey = equal_to<ValueType>,
+ class _A = allocator <ValueType> >
+class hash_set :
+ public rw_hashset<ValueType, class _HashFcn, class _EqualKey, class _A> {
+};
+
+} // end HASH_NAMESPACE;
+#endif
+
+using HASH_NAMESPACE::hash_set;
+
+// Include vector because ext/hash_set includes stl_vector.h and leaves
+// out specializations like stl_bvector.h, causing link conflicts.
+#include <vector>
+
+#include "llvm/ADT/HashExtras.h"
+
+#endif