http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45351
--- Comment #11 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> 2011-07-19 16:57:00 UTC --- > Do struct alignment rules on Tru64 have an effect? Not that I > looked-up/read the ABI details.. I had a look at `Calling Standard for Alpha Systems', and the rules seemed as expected and straight-forward. > But I'd be curious what this does: > > #include something > #include stddef.h > > > int main() > { > typedef struct { char a; sem_t b; } t1; > printf("%u %u\n", sizeof(t1), offsetof(t1, b)); > return 0; > } > > 5 or 6 or 8 or other? > and 1 or 2 or 4 or other? > If the alignment is really only 2, then I'd expect 6 and 2. This is what I get, with both cc and gcc. Rainer