This has the advantage of telling you what the sizes are
In file included from ../../libraries/AC_AttitudeControl/AC_PosControl.h:3:
../../libraries/AP_Common/AP_Common.h:103:3: fatal error: static_assert failed "wrong size"
static_assert(s == t, "wrong size");
^ ~~~~~~
../../libraries/AP_Common/AP_Common.h:147:52: note: in instantiation of template class 'assert_structure_size<12, 11>' requested here
assert_structure_size<sizeof(struct Location), 11> _assert_location_size;
4dc157951b