1 //===-- llvm/ADT/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 LLVM_ADT_HASH_MAP
18 #define LLVM_ADT_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 #undef HAVE_GNU_EXT_HASH_MAP
29 #undef HAVE_STD_EXT_HASH_MAP
30 #undef HAVE_GLOBAL_HASH_MAP
32 #if HAVE_GNU_EXT_HASH_MAP
33 // This is for GCC-3.1+ which puts hash in ext/hash_map
34 # include <ext/hash_map>
35 # ifndef HASH_NAMESPACE
36 # define HASH_NAMESPACE __gnu_cxx
39 // GCC 3.0.x puts hash_map in <ext/hash_map> and in the std namespace.
40 #elif HAVE_STD_EXT_HASH_MAP
41 # include <ext/hash_map>
42 # ifndef HASH_NAMESPACE
43 # define HASH_NAMESPACE std
46 // Older compilers such as GCC before version 3.0 do not keep
47 // extensions in the `ext' directory, and ignore the `std' namespace.
48 #elif HAVE_GLOBAL_HASH_MAP
50 # ifndef HASH_NAMESPACE
51 # define HASH_NAMESPACE std
54 // Give a warning if we couldn't find it, instead of (or in addition to)
55 // randomly doing something dumb.
57 # warning "Autoconfiguration failed to find the hash_map header file."
60 using HASH_NAMESPACE::hash_map;
61 using HASH_NAMESPACE::hash_multimap;
62 using HASH_NAMESPACE::hash;
64 // Include vector because ext/hash_map includes stl_vector.h and leaves
65 // out specializations like stl_bvector.h, causing link conflicts.
68 #include "llvm/ADT/HashExtras.h"