> The big question, which I ask whenever someone harps on about portability, is does it even make sense? Yes. I probably won't port my program to a PDP-11 or a

> The big question, which I ask whenever someone harps on about portability, is does it even make sense? Yes. I probably won't port my program to a PDP-11 or a Motorola 68000. But by relying on undefined behavior or implementation-defined behavior, I am making it hard to port my program, say, from Windows/x86-64 to Debian/ARM (e.g. Raspian).