Remove use of Predef in detail/order.hpp

include/boost/endian/detail/order.hpp

@@ -7,7 +7,36 @@
 // http://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/core/scoped_enum.hpp>
-#include <boost/predef/other/endian.h>
+
+#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+
+# define BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER little
+
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+
+# define BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER big
+
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_PDP_ENDIAN__) && __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
+
+# error The Boost.Endian library does not support platforms with PDP endianness.
+
+#elif defined(__LITTLE_ENDIAN__)
+
+# define BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER little
+
+#elif defined(__BIG_ENDIAN__)
+
+# define BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER big
+
+#elif defined(_MSC_VER)
+
+# define BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER little
+
+#else
+
+# error The Boost.Endian library could not determine the endianness of this platform.
+
+#endif
 
 namespace boost
 {
@@ -16,20 +45,15 @@ namespace endian
 
 BOOST_SCOPED_ENUM_START(order)
 {
-    big, little,
+    big,
+    little,
+    native = BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER
 
-# if BOOST_ENDIAN_BIG_BYTE
-
-    native = big
-
-# else
-
-    native = little
-
-# endif
 }; BOOST_SCOPED_ENUM_END
 
 } // namespace endian
 } // namespace boost
 
+#undef BOOST_ENDIAN_NATIVE_ORDER_INITIALIZER
+
 #endif  // BOOST_ENDIAN_DETAIL_ORDER_HPP_INCLUDED