I don't see a clear explain the motivation for this change - can you confirm my understanding or provide clarification? It looks like the issue is that D110337 caused a regression for cases when user code directly calls a device library function that requires hostcall services, right? If so, I think this issue highlights a weakness in the module flag approach implemented in D110337 - i.e., now the compiler needs to know every library function that may require hostcall services.