[pseudohadamard]

Good point, yeah. I really want to like clang because it's not gcc but they have been following the gcc path a lot in recent years. I haven't actually seen it with MSVC, but I'm still on an old pre-bloat version of Visual Studio so maybe they've got worse in recent versions too.

I think a lot of the UB though isn't "let's exploit UB", it's "we didn't even know we had UB in the code". An example is twos-complement arithmetic, which the C language has finally acknowledged more than half a century after the last non-twos-complement machine was built (was the CDC 6600 the last one's-complement machine? Were most of the gcc dev even born when that was released?). So everyone on earth has been under the crazy notion that their computer used twos-complement maths which the gcc (and clang) devs know is actually UB and allows them to do whatever they want with your code when they encounter it.