[bregma]

> Saying 'this is what I will do when an int can't hold the assigned value' is defining the behavior, ergo it is no longer undefined!

Defining the behaviour of a particular compiler under specific circumstances does not equate to defining the behaviour of the C language.

[joosters]

You are reading words that nobody wrote. No-one claimed that they were redefining the ‘C spec’ by passing flags to their compiler - the standards board’s job is still safe!