//===-- Support/hash_map - "Portable" wrapper around hash_map ---*- 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.
+//
+//===----------------------------------------------------------------------===//
+//
// This file provides a wrapper around the mysterious <hash_map> header file
// that seems to move around between GCC releases into and out of namespaces at
// will. #including this header will cause hash_map to be available in the
#include "Config/config.h"
#ifdef HAVE_GNU_EXT_HASH_MAP
+// This is for GCC-3.1+ which puts hash in ext/hash_map
+# include <ext/hash_map>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE __gnu_cxx
+# endif
-#include <ext/hash_map>
-#define HASH_NAMESPACE __gnu_cxx
-
-#else
+// GCC 3.0.x puts hash_map in <ext/hash_map> and in the std namespace.
+#elif defined(HAVE_STD_EXT_HASH_MAP)
+# include <ext/hash_map>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE std
+# endif
-#ifdef HAVE_STD_EXT_HASH_MAP
-#include <ext/hash_map>
-#define HASH_NAMESPACE std
+// 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_MAP)
+# include <hash_map>
+# ifndef HASH_NAMESPACE
+# define HASH_NAMESPACE std
+# endif
+// Give a warning if we couldn't find it, instead of (or in addition to)
+// randomly doing something dumb.
#else
-#include <hash_map>
-#define HASH_NAMESPACE
-#endif
-
+# warning "Autoconfiguration failed to find the hash_map header file."
#endif
using HASH_NAMESPACE::hash_map;
using HASH_NAMESPACE::hash_multimap;
using HASH_NAMESPACE::hash;
+// Include vector because ext/hash_map includes stl_vector.h and leaves
+// out specializations like stl_bvector.h, causing link conflicts.
+#include <vector>
+
#include <Support/HashExtras.h>
#endif