lib/int_endianness.h

   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(__DragonFly__) || defined(__minix)
  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 #if defined(__OpenBSD__) || defined(__Bitrig__)
  48 #include <machine/endian.h>
  49
  50 #if _BYTE_ORDER == _BIG_ENDIAN
  51 #define _YUGA_LITTLE_ENDIAN 0
  52 #define _YUGA_BIG_ENDIAN    1
  53 #elif _BYTE_ORDER == _LITTLE_ENDIAN
  54 #define _YUGA_LITTLE_ENDIAN 1
  55 #define _YUGA_BIG_ENDIAN    0
  56 #endif /* _BYTE_ORDER */
  57
  58 #endif /* OpenBSD and Bitrig. */
  59
  60 /* .. */
  61
  62 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */
  63 #if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ )
  64
  65 #ifdef __BIG_ENDIAN__
  66 #if __BIG_ENDIAN__
  67 #define _YUGA_LITTLE_ENDIAN 0
  68 #define _YUGA_BIG_ENDIAN    1
  69 #endif
  70 #endif /* __BIG_ENDIAN__ */
  71
  72 #ifdef __LITTLE_ENDIAN__
  73 #if __LITTLE_ENDIAN__
  74 #define _YUGA_LITTLE_ENDIAN 1
  75 #define _YUGA_BIG_ENDIAN    0
  76 #endif
  77 #endif /* __LITTLE_ENDIAN__ */
  78
  79 #endif /* Mac OSX */
  80
  81 /* .. */
  82
  83 #if defined(__linux__)
  84 #include <endian.h>
  85
  86 #if __BYTE_ORDER == __BIG_ENDIAN
  87 #define _YUGA_LITTLE_ENDIAN 0
  88 #define _YUGA_BIG_ENDIAN    1
  89 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  90 #define _YUGA_LITTLE_ENDIAN 1
  91 #define _YUGA_BIG_ENDIAN    0
  92 #endif /* __BYTE_ORDER */
  93
  94 #endif /* GNU/Linux */
  95
  96 #if defined(_WIN32)
  97
  98 #define _YUGA_LITTLE_ENDIAN 1
  99 #define _YUGA_BIG_ENDIAN    0
 100
 101 #endif /* Windows */
 102
 103 /* . */
 104
 105 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
 106 #error Unable to determine endian
 107 #endif /* Check we found an endianness correctly. */
 108
 109 #endif /* INT_ENDIANNESS_H */