[deletes]

The behavior is defined, if you disable the rule or your compiler doesn't follow it.

[rcfox]

That's the opposite of "defined", in the context of a language discussion.

[deletes]

It is a good thing that actual results rely on the compiler implementation, not the language.

[rcfox]

Sure, your code will work today, with your compiler. But will it work tomorrow? Or what if your client wants to compile it on their machine, in a different operating system, with a compiler that you've never tried?

[deletes]

Readme, documentation, makefile(??)