-template<typename GraphType>
-sys::Path WriteGraph(const GraphType &G, const std::string &Name,
- bool ShortNames = false, const std::string &Title = "") {
- std::string ErrMsg;
- sys::Path Filename = sys::Path::GetTemporaryDirectory(&ErrMsg);
- if (Filename.isEmpty()) {
- errs() << "Error: " << ErrMsg << "\n";
- return Filename;
- }
- Filename.appendComponent(Name + ".dot");
- if (Filename.makeUnique(true,&ErrMsg)) {
- errs() << "Error: " << ErrMsg << "\n";
- return sys::Path();
+std::string createGraphFilename(const Twine &Name, int &FD);
+
+template <typename GraphType>
+std::string WriteGraph(const GraphType &G, const Twine &Name,
+ bool ShortNames = false, const Twine &Title = "") {
+ int FD;
+ // Windows can't always handle long paths, so limit the length of the name.
+ std::string N = Name.str();
+ N = N.substr(0, std::min<std::size_t>(N.size(), 140));
+ std::string Filename = createGraphFilename(N, FD);
+ raw_fd_ostream O(FD, /*shouldClose=*/ true);
+
+ if (FD == -1) {
+ errs() << "error opening file '" << Filename << "' for writing!\n";
+ return "";