alignof
const size_t roundedReclen = ROUNDUP(reclen, alignof(struct dirent));
static size_t sDefaultAlignment = alignof(max_align_t);
static size_t sDefaultAlignment = alignof(max_align_t);
# define HAIKU_MEMORY_ALIGNMENT alignof(max_align_t)
__attribute__((__aligned__(alignof(PagesAllocator))))
const static size_t kAlignment = alignof(max_align_t);