[Development] Unsatisfied symbols for QAbstractOpenGLFunctions

[Christophe de Dinechin]

> Try with a class that has a copy constructor or with a usage pattern that causes the compiler to generate a copy constructor.

Which gives me a possible fix: in my TaoOpenGLFunctions, I can add a copy constructor that invokes the default constructor instead of the copy constructor. So I can solve my problem, but I still think this is a bug in QAbstractOpenGLFunctions. It should either provide a copy constructor, possibly private if you want to generate a compile-time error, or be marked as Q_GUI_EXPORT.

Thanks,
Christophe