Merge branch 'master' into blender2.8

intern/cycles/blender/addon/properties.py

@@ -1484,7 +1484,11 @@ class CyclesPreferences(bpy.types.AddonPreferences):
         return self.get_num_gpu_devices() > 0
 
     def draw_impl(self, layout, context):
+        available_device_types = self.get_device_types(context)
         layout.label(text="Cycles Compute Device:")
+        if len(available_device_types) == 1:
+            layout.label(text="No compatible GPUs found", icon='INFO')
+            return
         layout.row().prop(self, "compute_device_type", expand=True)
 
         cuda_devices, opencl_devices = self.get_devices()

intern/cycles/device/opencl/opencl_util.cpp

@@ -645,7 +645,7 @@ bool OpenCLInfo::device_supported(const string& platform_name,
 		return true;
 	}
 	if(platform_name == "Apple" && device_type == CL_DEVICE_TYPE_GPU) {
-		return true;
+		return false;
 	}
 	return false;
 }