alignas
char alignas(16) buffer[1 + 16 + 64 + 1 + 1];
char alignas(16) buffer[1 + 16 + 64 + 1 + 1];
alignas(uint32_t) char contents[13 * 512 - 4];
alignas(uint32_t) char contents[13 * 512 - 4];
#define _Alignas(x) alignas(x)
alignas(4) char vendor[16];