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