1 struct foo 2 { 3 unsigned half:16; 4 unsigned long whole:32 __attribute__ ((packed)); 5 }; 6 7 f (struct foo *q) 8 { 9 if (q->half != 0x1234) 10 abort (); 11 if (q->whole != 0x56789abcL) 12 abort (); 13 } 14 15 main () 16 { 17 struct foo bar; 18 19 bar.half = 0x1234; 20 bar.whole = 0x56789abcL; 21 f (&bar); 22 exit (0); 23 } 24