Comment by ehvatum
3 years ago
> I would contend that removing checks is also unreasonable.
Yeah, but removing a null check after a dereference has a solid rationale, so it’s very different from GCC taking it upon itself to format your drive.
3 years ago
> I would contend that removing checks is also unreasonable.
Yeah, but removing a null check after a dereference has a solid rationale, so it’s very different from GCC taking it upon itself to format your drive.
The general thinking seems to be that UB can do anything so you can't complain, whatever that anything is.
That would logically include reformatting your hard drive.
I definitely disagree with that pov, if you don't accept that UB can result in anything then the line needs to be drawn somewhere.
I would contend that UB stems from the hardware. C won't take responsibility for what the hardware does. Neither will it step in to change what the hardware does. That in turn means that UB means the compiler shouldn't optimise because the behaviour is undefined.