Use RTL code as library in OpenCL?

Hi

Altera mentioned that it's possible to include RTL design into OpenCL code as a compiled library.

I can't find documentation about it, I tried looking at the design examples "library1 & 2" and still have no clue on how to do this.

The xml file looks complicated, like the INTERFACE part and what goes to the REQUIREMENTS. And why does it need a CL file that writes the function again if it's including from RTL?

Thank you.