1 /* ===-- int_endianness.h - configuration header for compiler-rt ------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file is a configuration header for compiler-rt.
11 * This file is not part of the interface of this library.
13 * ===----------------------------------------------------------------------===
16 #ifndef INT_ENDIANNESS_H
17 #define INT_ENDIANNESS_H
19 #if defined(__SVR4) && defined(__sun)
20 #include <sys/byteorder.h>
22 #if defined(_BIG_ENDIAN)
23 #define _YUGA_LITTLE_ENDIAN 0
24 #define _YUGA_BIG_ENDIAN 1
25 #elif defined(_LITTLE_ENDIAN)
26 #define _YUGA_LITTLE_ENDIAN 1
27 #define _YUGA_BIG_ENDIAN 0
28 #else /* !_LITTLE_ENDIAN */
29 #error "unknown endianness"
30 #endif /* !_LITTLE_ENDIAN */
32 #endif /* Solaris and AuroraUX. */
36 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \
38 #include <sys/endian.h>
40 #if _BYTE_ORDER == _BIG_ENDIAN
41 #define _YUGA_LITTLE_ENDIAN 0
42 #define _YUGA_BIG_ENDIAN 1
43 #elif _BYTE_ORDER == _LITTLE_ENDIAN
44 #define _YUGA_LITTLE_ENDIAN 1
45 #define _YUGA_BIG_ENDIAN 0
46 #endif /* _BYTE_ORDER */
50 #if defined(__OpenBSD__) || defined(__Bitrig__)
51 #include <machine/endian.h>
53 #if _BYTE_ORDER == _BIG_ENDIAN
54 #define _YUGA_LITTLE_ENDIAN 0
55 #define _YUGA_BIG_ENDIAN 1
56 #elif _BYTE_ORDER == _LITTLE_ENDIAN
57 #define _YUGA_LITTLE_ENDIAN 1
58 #define _YUGA_BIG_ENDIAN 0
59 #endif /* _BYTE_ORDER */
61 #endif /* OpenBSD and Bitrig. */
65 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the
66 * compiler (at least with GCC) */
67 #if defined(__APPLE__) || defined(__ellcc__ )
71 #define _YUGA_LITTLE_ENDIAN 0
72 #define _YUGA_BIG_ENDIAN 1
74 #endif /* __BIG_ENDIAN__ */
76 #ifdef __LITTLE_ENDIAN__
78 #define _YUGA_LITTLE_ENDIAN 1
79 #define _YUGA_BIG_ENDIAN 0
81 #endif /* __LITTLE_ENDIAN__ */
87 #if defined(__linux__)
89 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
90 #define _YUGA_LITTLE_ENDIAN 0
91 #define _YUGA_BIG_ENDIAN 1
92 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
93 #define _YUGA_LITTLE_ENDIAN 1
94 #define _YUGA_BIG_ENDIAN 0
95 #endif /* __BYTE_ORDER__ */
97 #endif /* GNU/Linux */
101 #define _YUGA_LITTLE_ENDIAN 1
102 #define _YUGA_BIG_ENDIAN 0
108 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
109 #error Unable to determine endian
110 #endif /* Check we found an endianness correctly. */
112 #endif /* INT_ENDIANNESS_H */