How can I turn off the message "Automatic linking with ...." at compilation time?

The intention of this line is to make sure that you have not forgotten to specify any C/C++ settings when you created your project.  If you want for example your application to be linked with the OG shared Dlls, you should specify _GXDLL in  the projects C/C++ settings.  If you did forget to add this define, you will see at compilation time that you are linking with the wrong library.

If you want to turn off the message, you should add the define _GXNOMSG to your projects C/C++ settings.