1119815Smarcel/* ===-- int_endianness.h - configuration header for compiler-rt ------------===
2119815Smarcel *
3119815Smarcel *		       The LLVM Compiler Infrastructure
4119815Smarcel *
5119815Smarcel * This file is dual licensed under the MIT and the University of Illinois Open
6119815Smarcel * Source Licenses. See LICENSE.TXT for details.
7119815Smarcel *
8119815Smarcel * ===----------------------------------------------------------------------===
9119815Smarcel *
10119815Smarcel * This file is a configuration header for compiler-rt.
11119815Smarcel * This file is not part of the interface of this library.
12119815Smarcel *
13119815Smarcel * ===----------------------------------------------------------------------===
14119815Smarcel */
15119815Smarcel
16119815Smarcel#ifndef INT_ENDIANNESS_H
17119815Smarcel#define INT_ENDIANNESS_H
18119815Smarcel
19119815Smarcel#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
20119815Smarcel    defined(__ORDER_LITTLE_ENDIAN__)
21119815Smarcel
22119815Smarcel/* Clang and GCC provide built-in endianness definitions. */
23119815Smarcel#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
24119815Smarcel#define _YUGA_LITTLE_ENDIAN 0
25119815Smarcel#define _YUGA_BIG_ENDIAN    1
26119815Smarcel#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
27119815Smarcel#define _YUGA_LITTLE_ENDIAN 1
28119815Smarcel#define _YUGA_BIG_ENDIAN    0
29119815Smarcel#endif /* __BYTE_ORDER__ */
30119815Smarcel
31119815Smarcel#else /* Compilers other than Clang or GCC. */
32119815Smarcel
33119815Smarcel#if defined(__SVR4) && defined(__sun)
34119815Smarcel#include <sys/byteorder.h>
35119815Smarcel
36119815Smarcel#if defined(_BIG_ENDIAN)
37119815Smarcel#define _YUGA_LITTLE_ENDIAN 0
38119815Smarcel#define _YUGA_BIG_ENDIAN    1
39119815Smarcel#elif defined(_LITTLE_ENDIAN)
40119866Smarcel#define _YUGA_LITTLE_ENDIAN 1
41119866Smarcel#define _YUGA_BIG_ENDIAN    0
42119866Smarcel#else /* !_LITTLE_ENDIAN */
43119866Smarcel#error "unknown endianness"
44119866Smarcel#endif /* !_LITTLE_ENDIAN */
45119866Smarcel
46119866Smarcel#endif /* Solaris and AuroraUX. */
47119815Smarcel
48119815Smarcel/* .. */
49119815Smarcel
50119815Smarcel#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) ||   \
51119815Smarcel    defined(__minix)
52119815Smarcel#include <sys/endian.h>
53119815Smarcel
54119815Smarcel#if _BYTE_ORDER == _BIG_ENDIAN
55119815Smarcel#define _YUGA_LITTLE_ENDIAN 0
56119815Smarcel#define _YUGA_BIG_ENDIAN    1
57119815Smarcel#elif _BYTE_ORDER == _LITTLE_ENDIAN
58119815Smarcel#define _YUGA_LITTLE_ENDIAN 1
59119815Smarcel#define _YUGA_BIG_ENDIAN    0
60119815Smarcel#endif /* _BYTE_ORDER */
61119815Smarcel
62119815Smarcel#endif /* *BSD */
63119815Smarcel
64119815Smarcel#if defined(__OpenBSD__) || defined(__Bitrig__)
65119815Smarcel#include <machine/endian.h>
66119815Smarcel
67119815Smarcel#if _BYTE_ORDER == _BIG_ENDIAN
68119815Smarcel#define _YUGA_LITTLE_ENDIAN 0
69119815Smarcel#define _YUGA_BIG_ENDIAN    1
70119815Smarcel#elif _BYTE_ORDER == _LITTLE_ENDIAN
71119815Smarcel#define _YUGA_LITTLE_ENDIAN 1
72119815Smarcel#define _YUGA_BIG_ENDIAN    0
73119815Smarcel#endif /* _BYTE_ORDER */
74119815Smarcel
75119815Smarcel#endif /* OpenBSD and Bitrig. */
76119815Smarcel
77119815Smarcel/* .. */
78120378Snyan
79119815Smarcel/* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the
80120376Snyan * compiler (at least with GCC) */
81120381Snyan#if defined(__APPLE__) || defined(__ellcc__ )
82119815Smarcel
83119815Smarcel#ifdef __BIG_ENDIAN__
84119815Smarcel#if __BIG_ENDIAN__
85119815Smarcel#define _YUGA_LITTLE_ENDIAN 0
86119815Smarcel#define _YUGA_BIG_ENDIAN    1
87119815Smarcel#endif
88119815Smarcel#endif /* __BIG_ENDIAN__ */
89119815Smarcel
90119815Smarcel#ifdef __LITTLE_ENDIAN__
91119815Smarcel#if __LITTLE_ENDIAN__
92119815Smarcel#define _YUGA_LITTLE_ENDIAN 1
93119815Smarcel#define _YUGA_BIG_ENDIAN    0
94119815Smarcel#endif
95#endif /* __LITTLE_ENDIAN__ */
96
97#endif /* Mac OSX */
98
99/* .. */
100
101#if defined(_WIN32)
102
103#define _YUGA_LITTLE_ENDIAN 1
104#define _YUGA_BIG_ENDIAN    0
105
106#endif /* Windows */
107
108#endif /* Clang or GCC. */
109
110/* . */
111
112#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
113#error Unable to determine endian
114#endif /* Check we found an endianness correctly. */
115
116#endif /* INT_ENDIANNESS_H */
117