int_endianness.h revision 229135 
1/* ===-- int_endianness.h - configuration header for compiler-rt ------------===
2 *
3 *		       The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file is a configuration header for compiler-rt.
11 * This file is not part of the interface of this library.
12 *
13 * ===----------------------------------------------------------------------===
14 */
15
16#ifndef INT_ENDIANNESS_H
17#define INT_ENDIANNESS_H
18
19#if defined(__SVR4) && defined(__sun)
20#include <sys/byteorder.h>
21
22#if _BYTE_ORDER == _BIG_ENDIAN
23#define _YUGA_LITTLE_ENDIAN 0
24#define _YUGA_BIG_ENDIAN    1
25#elif _BYTE_ORDER == _LITTLE_ENDIAN
26#define _YUGA_LITTLE_ENDIAN 1
27#define _YUGA_BIG_ENDIAN    0
28#endif /* _BYTE_ORDER */
29
30#endif /* Solaris and AuroraUX. */
31
32/* .. */
33
34#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
35#include <sys/endian.h>
36
37#if _BYTE_ORDER == _BIG_ENDIAN
38#define _YUGA_LITTLE_ENDIAN 0
39#define _YUGA_BIG_ENDIAN    1
40#elif _BYTE_ORDER == _LITTLE_ENDIAN
41#define _YUGA_LITTLE_ENDIAN 1
42#define _YUGA_BIG_ENDIAN    0
43#endif /* _BYTE_ORDER */
44
45#endif /* *BSD */
46
47/* .. */
48
49/* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */
50#if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ )
51
52#ifdef __BIG_ENDIAN__
53#if __BIG_ENDIAN__
54#define _YUGA_LITTLE_ENDIAN 0
55#define _YUGA_BIG_ENDIAN    1
56#endif
57#endif /* __BIG_ENDIAN__ */
58
59#ifdef __LITTLE_ENDIAN__
60#if __LITTLE_ENDIAN__
61#define _YUGA_LITTLE_ENDIAN 1
62#define _YUGA_BIG_ENDIAN    0
63#endif
64#endif /* __LITTLE_ENDIAN__ */
65
66#endif /* Mac OSX */
67
68/* .. */
69
70#if defined(__linux__)
71#include <endian.h>
72
73#if __BYTE_ORDER == __BIG_ENDIAN
74#define _YUGA_LITTLE_ENDIAN 0
75#define _YUGA_BIG_ENDIAN    1
76#elif __BYTE_ORDER == __LITTLE_ENDIAN
77#define _YUGA_LITTLE_ENDIAN 1
78#define _YUGA_BIG_ENDIAN    0
79#endif /* __BYTE_ORDER */
80
81#endif /* GNU/Linux */
82
83/* . */
84
85#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
86#error Unable to determine endian
87#endif /* Check we found an endianness correctly. */
88
89#endif /* INT_ENDIANNESS_H */
90