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Merge pull request #74 from miloyip/issue71endianness

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Improves endian detection
This commit is contained in:
Milo Yip 2014-07-15 09:00:10 +08:00
commit 2d732794f0
1 changed files with 37 additions and 11 deletions
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36
include/rapidjson/rapidjson.h
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@ -52,23 +52,49 @@
#define RAPIDJSON_BIGENDIAN 1 //!< Big endian machine #define RAPIDJSON_BIGENDIAN 1 //!< Big endian machine
//! Endianness of the machine. //! Endianness of the machine.
/*! GCC provided macro for detecting endianness of the target machine. But other /*! GCC 4.6 provided macro for detecting endianness of the target machine. But other
compilers may not have this. User can define RAPIDJSON_ENDIAN to either compilers may not have this. User can define RAPIDJSON_ENDIAN to either
\ref RAPIDJSON_LITTLEENDIAN or \ref RAPIDJSON_BIGENDIAN. \ref RAPIDJSON_LITTLEENDIAN or \ref RAPIDJSON_BIGENDIAN.
Implemented with reference to
https://gcc.gnu.org/onlinedocs/gcc-4.6.0/cpp/Common-Predefined-Macros.html
http://www.boost.org/doc/libs/1_42_0/boost/detail/endian.hpp
*/ */
#ifndef RAPIDJSON_ENDIAN #ifndef RAPIDJSON_ENDIAN
// Detect with GCC 4.6's macro
# ifdef __BYTE_ORDER__ # ifdef __BYTE_ORDER__
# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ # if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN # define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
#else # elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN # define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN
#endif // __BYTE_ORDER__
# else # else
#define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN // Assumes little endian otherwise. # error Unknown machine endianess detected. User needs to define RAPIDJSON_ENDIAN.
# endif // __BYTE_ORDER__
// Detect with GLIBC's endian.h
# elif defined(__GLIBC__)
# include <endian.h>
# if (__BYTE_ORDER == __LITTLE_ENDIAN)
# define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
# elif (__BYTE_ORDER == __BIG_ENDIAN)
# define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN
# else
# error Unknown machine endianess detected. User needs to define RAPIDJSON_ENDIAN.
# endif // __GLIBC__
// Detect with _LITTLE_ENDIAN and _BIG_ENDIAN macro
# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
# define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
# elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
# define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN
// Detect with architecture macros
# elif defined(__sparc) || defined(__sparc__) || defined(_POWER) || defined(__powerpc__) || defined(__ppc__) || defined(__hpux) || defined(__hppa) || defined(_MIPSEB) || defined(_POWER) || defined(__s390__)
# define RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN
# elif defined(__i386__) || defined(__alpha__) || defined(__ia64) || defined(__ia64__) || defined(_M_IX86) || defined(_M_IA64) || defined(_M_ALPHA) || defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) || defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || defined(__bfin__)
# define RAPIDJSON_ENDIAN RAPIDJSON_LITTLEENDIAN
# else
# error Unknown machine endianess detected. User needs to define RAPIDJSON_ENDIAN.
# endif # endif
#endif // RAPIDJSON_ENDIAN #endif // RAPIDJSON_ENDIAN
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
// RAPIDJSON_ALIGNSIZE // RAPIDJSON_ALIGNSIZE