Simple singleton won't link

I have a simple singleton where I declare a private constructor, but don't define it. I thought that was the way to stop someone from using it. yet it won't link?
i'm using gcc.

If you have an instance of the class (the singleton), it needs to be constructed. The class therefore must have either no constructor, (in which case the compiler will create one for you), or a defined constructor that is used to construct it. If you need to construct the object with a constructor that you don't define (provide a body for), the program cannot work.

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Simple singleton won't link

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