Is undefined behavior only an issue if you are deploying on several platforms?

Question

Most of the conversations around undefined behavior (UB) talk about how there are some platforms that can do this, or some compilers do that.

What i

Answer 1

Changing the code without breaking it requires reading and understanding the current code. Relying on undefined behavior hurts readability: If I can't look it up, how am I supposed to know what the code does?

While portability of the program might not be an issue, portability of the programmers might be. If you need to hire someone to maintain the program, you'll want to be able to look simply for a ' developer with experience in ' that fits well into your team rather than having to find a capable ' developer with experience in knowing (or willing to learn) all the undefined behavior intrinsics of version x.y.z on platform foo when used in combination with bar while having baz on the furbleblawup'.