> Bugs tend to disappear on me when I change the optimiser flags or run the thing under gdb though A lot of that shouts UB or compiler bug to me. I don't get t

> Bugs tend to disappear on me when I change the optimiser flags or run the thing under gdb though A lot of that shouts UB or compiler bug to me. I don't get this in my code unless there is some UB I missed. Unfortunately there are places where UB is unintuitive and may not even be present in newer versions of the language.