How to disable return value optimization in Visual Studio 2010?

Question

Is it possible to disable RVO (return value optimization) in Visual Studio 2010? Setting optimization flag to /Od (turns off all optimizations) doesn't help. In g++ there exists flag -fno-elide-constructors which disables RVO.

Answer 1

You cannot. It is just that simple. RVO/NRVO is Standard, and your code should not depend on it not being present.

Answer 2

Try to define your variable as volatile , maybe solves your problem. If it does not, you should send come code...

Answer 3

There is never any reason to disable this optimisation! What are you trying to achieve? It helps debug builds run faster without any bad side-effects at all. It also ensures code dependent on RVO or NRVO works identically in debug and release.