> | though I vaguely > | recall some complaints that you couldn't build v7 Unix if your compiler > | generated integer overflow traps. > > this matches what I've told recently by some people who worked at bell > labs, in the unix room.
I have recollections of that being the case as well. Moreover, I think it's also clearly established that PCC always implemented wrapping semantics. What's less clear (at least to me) is what other existing practice that the ANSI C committee took into account was at the time.