Machine endianness detection taken from <boost/detail/limits.hpp>

[SVN r29573]

include/boost/detail/endian.hpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/*
+ * Copyright notice reproduced from <boost/detail/limits.hpp>, from
+ * which this code was originally taken.
+ *
+ * Modified by Caleb Epstein to use <endian.h> with GNU libc and to
+ * defined the BOOST_ENDIAN macro.
+ */
+
+#ifndef BOOST_DETAIL_ENDIAN_HPP
+#define BOOST_DETAIL_ENDIAN_HPP
+
+// GNU libc offers the helpful header <endian.h> which defines
+// __BYTE_ORDER
+
+#if defined (__GLIBC__)
+# include <endian.h>
+# if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#  define BOOST_LITTLE_ENDIAN
+# elif (__BYTE_ORDER == __BIG_ENDIAN)
+#  define BOOST_BIG_ENDIAN
+# elif (__BYTE_ORDER == __PDP_ENDIAN)
+#  define BOOST_PDP_ENDIAN
+# else
+#  error Unknown machine endianness detected.
+# endif
+# define BOOST_BYTE_ORDER __BYTE_ORDER
+#elif defined(__sparc) || defined(__sparc__) \
+   || defined(_POWER) || defined(__powerpc__) \
+   || defined(__ppc__) || defined(__hppa) \
+   || defined(_MIPSEB) || defined(_POWER) \
+   || defined(__s390__)
+# define BOOST_BIG_ENDIAN
+# define BOOST_BYTE_ORDER 4321
+#elif defined(__i386__) || defined(__alpha__) \
+   || defined(__ia64)  || defined(__ia64__)
+# define BOOST_LITTLE_ENDIAN
+# define BOOST_BYTE_ORDER 1234
+#else
+# error The file boost/detail/endian.hpp needs to be set up for your CPU type.
+#endif
+
+
+#endif