int_endianness.h revision 1.1.1.2
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(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ 20 defined(__ORDER_LITTLE_ENDIAN__) 21 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__ */ 30 31#else /* Compilers other than Clang or GCC. */ 32 33#if defined(__SVR4) && defined(__sun) 34#include <sys/byteorder.h> 35 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 */ 45 46#endif /* Solaris and AuroraUX. */ 47 48/* .. */ 49 50#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \ 51 defined(__minix) 52#include <sys/endian.h> 53 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 */ 61 62#endif /* *BSD */ 63 64#if defined(__OpenBSD__) || defined(__Bitrig__) 65#include <machine/endian.h> 66 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 */ 74 75#endif /* OpenBSD and Bitrig. */ 76 77/* .. */ 78 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__ ) 82 83#ifdef __BIG_ENDIAN__ 84#if __BIG_ENDIAN__ 85#define _YUGA_LITTLE_ENDIAN 0 86#define _YUGA_BIG_ENDIAN 1 87#endif 88#endif /* __BIG_ENDIAN__ */ 89 90#ifdef __LITTLE_ENDIAN__ 91#if __LITTLE_ENDIAN__ 92#define _YUGA_LITTLE_ENDIAN 1 93#define _YUGA_BIG_ENDIAN 0 94#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