add new function

[oota-llvm.git] / include / Support / hash_map

diff --git a/include/Support/hash_map b/include/Support/hash_map
index ce4c42f6ab9ff5be35e73d309d1a01c2c05bfb4a..de3b3f5ea5f205c2b686e1ea54bf595b4c545957 100644 (file)
--- a/include/Support/hash_map
+++ b/include/Support/hash_map
@@ -1,5 +1,12 @@
 //===-- 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
@@ -21,27 +28,41 @@
 #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