lib/builtins/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 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 */
  31
  32 #endif /* Solaris and AuroraUX. */
  33
  34 /* .. */
  35
  36 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__minix)
  37 #include <sys/endian.h>
  38
  39 #if _BYTE_ORDER == _BIG_ENDIAN
  40 #define _YUGA_LITTLE_ENDIAN 0
  41 #define _YUGA_BIG_ENDIAN    1
  42 #elif _BYTE_ORDER == _LITTLE_ENDIAN
  43 #define _YUGA_LITTLE_ENDIAN 1
  44 #define _YUGA_BIG_ENDIAN    0
  45 #endif /* _BYTE_ORDER */
  46
  47 #endif /* *BSD */
  48
  49 #if defined(__OpenBSD__) || defined(__Bitrig__)
  50 #include <machine/endian.h>
  51
  52 #if _BYTE_ORDER == _BIG_ENDIAN
  53 #define _YUGA_LITTLE_ENDIAN 0
  54 #define _YUGA_BIG_ENDIAN    1
  55 #elif _BYTE_ORDER == _LITTLE_ENDIAN
  56 #define _YUGA_LITTLE_ENDIAN 1
  57 #define _YUGA_BIG_ENDIAN    0
  58 #endif /* _BYTE_ORDER */
  59
  60 #endif /* OpenBSD and Bitrig. */
  61
  62 /* .. */
  63
  64 /* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */
  65 #if defined(__APPLE__) || defined(__ellcc__ )
  66
  67 #ifdef __BIG_ENDIAN__
  68 #if __BIG_ENDIAN__
  69 #define _YUGA_LITTLE_ENDIAN 0
  70 #define _YUGA_BIG_ENDIAN    1
  71 #endif
  72 #endif /* __BIG_ENDIAN__ */
  73
  74 #ifdef __LITTLE_ENDIAN__
  75 #if __LITTLE_ENDIAN__
  76 #define _YUGA_LITTLE_ENDIAN 1
  77 #define _YUGA_BIG_ENDIAN    0
  78 #endif
  79 #endif /* __LITTLE_ENDIAN__ */
  80
  81 #endif /* Mac OSX */
  82
  83 /* .. */
  84
  85 #if defined(__linux__)
  86 #include <endian.h>
  87
  88 #if __BYTE_ORDER == __BIG_ENDIAN
  89 #define _YUGA_LITTLE_ENDIAN 0
  90 #define _YUGA_BIG_ENDIAN    1
  91 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  92 #define _YUGA_LITTLE_ENDIAN 1
  93 #define _YUGA_BIG_ENDIAN    0
  94 #endif /* __BYTE_ORDER */
  95
  96 #endif /* GNU/Linux */
  97
  98 #if defined(_WIN32)
  99
 100 #define _YUGA_LITTLE_ENDIAN 1
 101 #define _YUGA_BIG_ENDIAN    0
 102
 103 #endif /* Windows */
 104
 105 /* . */
 106
 107 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
 108 #error Unable to determine endian
 109 #endif /* Check we found an endianness correctly. */
 110
 111 #endif /* INT_ENDIANNESS_H */