typeonly define version
{
  u32 major;
  u32 minor;
  u32 patch;

  /* since we can't guarantee that only fixed length args will follow the typedef,
     string type not supported for typedef for now. */
  u8 pre_release[17];           /* 16 + "\0" */
  u8 build_metadata[17];        /* 16 + "\0" */
};