# define XBT_IMPORT_NO_EXPORT(type) __attribute__((visibility("default"))) type
# define XBT_PUBLIC_DATA(type) extern __attribute__((visibility("default"))) type
# define XBT_PUBLIC_CLASS class __attribute__((visibility("default")))
# define XBT_IMPORT_NO_EXPORT(type) __attribute__((visibility("default"))) type
# define XBT_PUBLIC_DATA(type) extern __attribute__((visibility("default"))) type
# define XBT_PUBLIC_CLASS class __attribute__((visibility("default")))