Are unspecified and undefined behavior required to be consistent between compiles of the same program with the same compiler in the same environment?

Question

Let\'s pretend my program contains a specific construct the C++ Standard states to be unspecified behavior. This basically means the implementation has to do something reasonabl

Answer 1

It's worth noting that the implementation of the specified behaviour of the C++ Standard is not 100% identical across compilers, even today. Given this, it's not reasonable to expect that unspecified or undefined behaviour is compiler-agnostic. You have the best chance of writing portable code if you just stick to the Standard.