CLSCompliant Attribute
Although you can mark your MC++ assemblies with the CLSCompliant attribute to indicate their public interfaces are defined according to the CLS rules, the MC++ compiler, unlike the C# one, won't do any checks about it. That means you need to verify yourself that you are indeed following the CLS rules, because the compiler will just be happy with whatever you feed it.

As far as I know, this is a very requested feature for a later version of the MC++ compiler.