Align array items to 8 bytes

How can I get array items aligned to 8 bytes? Since all the items are pointers, without 8 byte alignment ubsan complains about "load of misaligned address". I tried `-D HXCPP_ALIGN_ALLOC` but it didn't help. I still often get memory addresses for `array->getBase()` divisible by 4 but not 8 and then ubsan complains.