RapidIO IP core x1 variations at 5.0 Gbaud that target a speed grade -4 Stratix V GX device cannot compile successfully. However, the RapidIO MegaCore Function User Guide indicates that devices in this device family are valid targets for your RapidIO design.
This issue has no workaround. Ensure your RapidIO IP core variation does not target an unsupported device.
This issue is fixed in version 13.0 of the RapidIO MegaCore Function User Guide.