1 //===-- Support/hash_map - "Portable" wrapper around hash_map ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides a wrapper around the mysterious <hash_map> header file
11 // that seems to move around between GCC releases into and out of namespaces at
12 // will. #including this header will cause hash_map to be available in the
15 //===----------------------------------------------------------------------===//
17 #ifndef SUPPORT_HASH_MAP
18 #define SUPPORT_HASH_MAP
20 // Compiler Support Matrix
22 // Version Namespace Header File
24 // 3.0.4 std ext/hash_map
25 // 3.1 __gnu_cxx ext/hash_map
28 #include "Config/config.h"
30 #ifdef HAVE_GNU_EXT_HASH_MAP
31 // This is for GCC-3.1+ which puts hash in ext/hash_map
32 # include <ext/hash_map>
33 # ifndef HASH_NAMESPACE
34 # define HASH_NAMESPACE __gnu_cxx
37 // GCC 3.0.x puts hash_map in <ext/hash_map> and in the std namespace.
38 #elif defined(HAVE_STD_EXT_HASH_MAP)
39 # include <ext/hash_map>
40 # ifndef HASH_NAMESPACE
41 # define HASH_NAMESPACE std
44 // Older compilers such as GCC before version 3.0 do not keep
45 // extensions in the `ext' directory, and ignore the `std' namespace.
46 #elif defined(HAVE_GLOBAL_HASH_MAP)
48 # ifndef HASH_NAMESPACE
49 # define HASH_NAMESPACE std
52 // Give a warning if we couldn't find it, instead of (or in addition to)
53 // randomly doing something dumb.
55 # warning "Autoconfiguration failed to find the hash_map header file."
58 using HASH_NAMESPACE::hash_map;
59 using HASH_NAMESPACE::hash_multimap;
60 using HASH_NAMESPACE::hash;
62 // Include vector because ext/hash_map includes stl_vector.h and leaves
63 // out specializations like stl_bvector.h, causing link conflicts.
66 #include <Support/HashExtras.h>