139                             std::string &ErrMsg) {  in ExecGraphViewer()  argument
141     if (sys::ExecuteAndWait(ExecPath, args, std::nullopt, {}, 0, 0, &ErrMsg)) {  in ExecGraphViewer()
142       errs() << "Error: " << ErrMsg << "\n";  in ExecGraphViewer()
148     sys::ExecuteNoWait(ExecPath, args, std::nullopt, {}, 0, &ErrMsg);  in ExecGraphViewer()
195   std::string ErrMsg;  in DisplayGraph()  local
208     if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))  in DisplayGraph()
217     if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))  in DisplayGraph()
228     return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);  in DisplayGraph()
241     return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);  in DisplayGraph()
288     if (ExecGraphViewer(GeneratorPath, args, Filename, true, ErrMsg))  in DisplayGraph()
321     ErrMsg.clear();  in DisplayGraph()
322     return ExecGraphViewer(ViewerPath, args, OutputFilename, wait, ErrMsg);  in DisplayGraph()
336     return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);  in DisplayGraph()