pushpack1.h

// ===============================================================================
// May be included multiple times - sets structure packing to 1 
// for all supported compilers. #include <poppack1.h> reverts the changes.
//
// Currently this works on the following compilers:
// MSVC 7,8,9
// GCC
// BORLAND (complains about 'pack state changed but not reverted', but works)
// Clang
//
//
// USAGE:
//
// struct StructToBePacked {
// } PACK_STRUCT;
//
// ===============================================================================

#ifdef AI_PUSHPACK_IS_DEFINED
#   error poppack1.h must be included after pushpack1.h
#endif

#if defined(_MSC_VER) ||  defined(__BORLANDC__) ||  defined (__BCPLUSPLUS__)
#   pragma pack(push,1)
#   define PACK_STRUCT
#elif defined( __GNUC__ )
#   if defined(__clang__)
#       define PACK_STRUCT  __attribute__((__packed__))
#   else
#       define PACK_STRUCT  __attribute__((gcc_struct, __packed__))
#   endif
#else
#   error Compiler not supported
#endif

#if defined(_MSC_VER)

// C4103: Packing was changed after the inclusion of the header, propably missing #pragma pop
#   pragma warning (disable : 4103) 
#endif

#define AI_PUSHPACK_IS_DEFINED