1 // Copyright 2005 Caleb Epstein
2 // Copyright 2006 John Maddock
3 // Copyright 2010 Rene Rivera
4 // Distributed under the Boost Software License, Version 1.0. (See accompany-
5 // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 * Silicon Graphics Computer Systems, Inc.
11 * Permission to use, copy, modify, distribute and sell this software
12 * and its documentation for any purpose is hereby granted without fee,
13 * provided that the above copyright notice appear in all copies and
14 * that both that copyright notice and this permission notice appear
15 * in supporting documentation. Silicon Graphics makes no
16 * representations about the suitability of this software for any
17 * purpose. It is provided "as is" without express or implied warranty.
21 * Copyright notice reproduced from <boost/detail/limits.hpp>, from
22 * which this code was originally taken.
24 * Modified by Caleb Epstein to use <endian.h> with GNU libc and to
25 * defined the BOOST_ENDIAN macro.
28 #ifndef BOOST_DETAIL_ENDIAN_HPP
29 #define BOOST_DETAIL_ENDIAN_HPP
31 // GNU libc offers the helpful header <endian.h> which defines
34 #if defined (__GLIBC__)
36 # if (__BYTE_ORDER == __LITTLE_ENDIAN)
37 # define BOOST_LITTLE_ENDIAN
38 # elif (__BYTE_ORDER == __BIG_ENDIAN)
39 # define BOOST_BIG_ENDIAN
40 # elif (__BYTE_ORDER == __PDP_ENDIAN)
41 # define BOOST_PDP_ENDIAN
43 # error Unknown machine endianness detected.
45 # define BOOST_BYTE_ORDER __BYTE_ORDER
46 #elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) || \
47 defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)
48 # define BOOST_BIG_ENDIAN
49 # define BOOST_BYTE_ORDER 4321
50 #elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) || \
51 defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
52 # define BOOST_LITTLE_ENDIAN
53 # define BOOST_BYTE_ORDER 1234
54 #elif defined(__sparc) || defined(__sparc__) \
55 || defined(_POWER) || defined(__powerpc__) \
56 || defined(__ppc__) || defined(__hpux) || defined(__hppa) \
57 || defined(_MIPSEB) || defined(_POWER) \
59 # define BOOST_BIG_ENDIAN
60 # define BOOST_BYTE_ORDER 4321
61 #elif defined(__i386__) || defined(__alpha__) \
62 || defined(__ia64) || defined(__ia64__) \
63 || defined(_M_IX86) || defined(_M_IA64) \
64 || defined(_M_ALPHA) || defined(__amd64) \
65 || defined(__amd64__) || defined(_M_AMD64) \
66 || defined(__x86_64) || defined(__x86_64__) \
67 || defined(_M_X64) || defined(__bfin__)
69 # define BOOST_LITTLE_ENDIAN
70 # define BOOST_BYTE_ORDER 1234
72 # error The file boost/detail/endian.hpp needs to be set up for your CPU type.