irrpack.h

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// Copyright (C) 2007-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

// include this file right before the data structures to be 1-aligned
// and add to each structure the PACK_STRUCT define just like this:
// struct mystruct
// {
//  ...
// } PACK_STRUCT;
// Always include the irrunpack.h file right after the last type declared
// like this, and do not put any other types with different alignment
// in between!

// byte-align structures
#if defined(_MSC_VER) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
#   pragma warning(disable: 4103)
#   pragma pack( push, packing )
#   pragma pack( 1 )
#   define PACK_STRUCT
#elif defined( __DMC__ )
#   pragma pack( push, 1 )
#   define PACK_STRUCT
#elif defined( __GNUC__ )
    // Using pragma pack might work with earlier gcc versions already, but
    // it started to be necessary with gcc 4.7 on mingw unless compiled with -mno-ms-bitfields.
    // And I found some hints on the web that older gcc versions on the other hand had sometimes
    // trouble with pragma pack while they worked with __attribute__((packed)).
#   if (__GNUC__ > 4 ) || ((__GNUC__ == 4 ) && (__GNUC_MINOR__ >= 7))
#       pragma pack( push, packing )
#       pragma pack( 1 )
#       define PACK_STRUCT
#   else
#       define PACK_STRUCT  __attribute__((packed))
    #endif
#else
#   error compiler not supported
#endif