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(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
20 defined(__ORDER_LITTLE_ENDIAN__)
22 /* Clang and GCC provide built-in endianness definitions. */
23 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
24 #define _YUGA_LITTLE_ENDIAN 0
25 #define _YUGA_BIG_ENDIAN 1
26 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
27 #define _YUGA_LITTLE_ENDIAN 1
28 #define _YUGA_BIG_ENDIAN 0
29 #endif /* __BYTE_ORDER__ */
31 #else /* Compilers other than Clang or GCC. */
33 #if defined(__SVR4) && defined(__sun)
34 #include <sys/byteorder.h>
36 #if defined(_BIG_ENDIAN)
37 #define _YUGA_LITTLE_ENDIAN 0
38 #define _YUGA_BIG_ENDIAN 1
39 #elif defined(_LITTLE_ENDIAN)
40 #define _YUGA_LITTLE_ENDIAN 1
41 #define _YUGA_BIG_ENDIAN 0
42 #else /* !_LITTLE_ENDIAN */
43 #error "unknown endianness"
44 #endif /* !_LITTLE_ENDIAN */
46 #endif /* Solaris and AuroraUX. */
50 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \
52 #include <sys/endian.h>
54 #if _BYTE_ORDER == _BIG_ENDIAN
55 #define _YUGA_LITTLE_ENDIAN 0
56 #define _YUGA_BIG_ENDIAN 1
57 #elif _BYTE_ORDER == _LITTLE_ENDIAN
58 #define _YUGA_LITTLE_ENDIAN 1
59 #define _YUGA_BIG_ENDIAN 0
60 #endif /* _BYTE_ORDER */
64 #if defined(__OpenBSD__)
65 #include <machine/endian.h>
67 #if _BYTE_ORDER == _BIG_ENDIAN
68 #define _YUGA_LITTLE_ENDIAN 0
69 #define _YUGA_BIG_ENDIAN 1
70 #elif _BYTE_ORDER == _LITTLE_ENDIAN
71 #define _YUGA_LITTLE_ENDIAN 1
72 #define _YUGA_BIG_ENDIAN 0
73 #endif /* _BYTE_ORDER */
79 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the
80 * compiler (at least with GCC) */
81 #if defined(__APPLE__) || defined(__ellcc__ )
85 #define _YUGA_LITTLE_ENDIAN 0
86 #define _YUGA_BIG_ENDIAN 1
88 #endif /* __BIG_ENDIAN__ */
90 #ifdef __LITTLE_ENDIAN__
92 #define _YUGA_LITTLE_ENDIAN 1
93 #define _YUGA_BIG_ENDIAN 0
95 #endif /* __LITTLE_ENDIAN__ */
103 #define _YUGA_LITTLE_ENDIAN 1
104 #define _YUGA_BIG_ENDIAN 0
108 #endif /* Clang or GCC. */
112 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
113 #error Unable to determine endian
114 #endif /* Check we found an endianness correctly. */
116 #endif /* INT_ENDIANNESS_H */