pub unsafe extern "C" fn rocksdb_backup_engine_options_set_backup_dir(
options: *mut rocksdb_backup_engine_options_t,
backup_dir: *const c_char
)
pub unsafe extern "C" fn rocksdb_backup_engine_options_set_backup_dir(
options: *mut rocksdb_backup_engine_options_t,
backup_dir: *const c_char
)