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#include static struct sss{ long long f; char :0; int i; } sss; #define _offsetof(st,f) ((char *)&((st *) 16)->f - (char *) 16) int main (void) { printf ("+++char zerofield inside struct starting with longlong:\n"); printf ("size=%d,align=%d\n", sizeof (sss), __alignof__ (sss)); printf ("offset-longlong=%d,offset-last=%d,\nalign-longlong=%d,align-last=%d\n", _offsetof (struct sss, f), _offsetof (struct sss, i), __alignof__ (sss.f), __alignof__ (sss.i)); return 0; }