Every bad thing has its uses. If an SDK author wants to be a responsible participant in the app's startup path, it will defer its own setup to the app.
`__attribute__((constructor))` is most obviously a hack – like any great hack, it is useful enough to be implemented everywhere, but it will never be standardized because everyone acknowledges that it sucks. I used to use it! But it is extremely limited in its usefulness, and there are always better solutions to the problem.
