1 //===-- Support/hash_set - "Portable" wrapper around hash_set ---*- 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 //===----------------------------------------------------------------------===//
11 // This file provides a wrapper around the mysterious <hash_set> header file
12 // that seems to move around between GCC releases into and out of namespaces at
13 // will. #including this header will cause hash_set to be available in the
16 //===----------------------------------------------------------------------===//
18 #ifndef SUPPORT_HASH_SET
19 #define SUPPORT_HASH_SET
21 // Compiler Support Matrix
23 // Version Namespace Header File
25 // 3.0.4 std ext/hash_set
26 // 3.1 __gnu_cxx ext/hash_set
29 #include "Config/config.h"
31 // GCC versions 3.1 and later put hash_set in <ext/hash_set> and in
32 // the __gnu_cxx namespace.
33 #if defined(HAVE_GNU_EXT_HASH_SET)
34 # include <ext/hash_set>
35 # ifndef HASH_NAMESPACE
36 # define HASH_NAMESPACE __gnu_cxx
39 // GCC 3.0.x puts hash_set in <ext/hash_set> and in the std namespace.
40 #elif defined(HAVE_STD_EXT_HASH_SET)
41 # include <ext/hash_set>
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 defined(HAVE_GLOBAL_HASH_SET)
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_set header file."
60 using HASH_NAMESPACE::hash_set;
61 using HASH_NAMESPACE::hash;
63 // Include vector because ext/hash_set includes stl_vector.h and leaves
64 // out specializations like stl_bvector.h, causing link conflicts.
67 #include <Support/HashExtras.h>