// Otherwise, create a new forward reference for this value and remember it.
GlobalValue *FwdVal;
- if (const FunctionType *FT = dyn_cast<FunctionType>(PTy->getElementType()))
+ if (const FunctionType *FT = dyn_cast<FunctionType>(PTy->getElementType())) {
+ // Function types can return opaque but functions can't.
+ if (isa<OpaqueType>(FT->getReturnType())) {
+ Error(Loc, "function may not return return opaque type");
+ return 0;
+ }
FwdVal = Function::Create(FT, GlobalValue::ExternalWeakLinkage, "", M);
- else
+ } else {
FwdVal = new GlobalVariable(PTy->getElementType(), false,
GlobalValue::ExternalWeakLinkage, 0, "", M);
+ }
ForwardRefValIDs[ID] = std::make_pair(FwdVal, Loc);
return FwdVal;