message: Treat source filenames with no dot as -x c++-header
diff: @@ -90,6 +90,8 @@ optional<std::string> SourceFileType(const std::string& path) {
  return std::string("objective-c++");
  else if (EndsWith(path, ".m"))
  return std::string("objective-c");
  + else if (path.find('.') == std::string::npos)
  + return std::string("c++-header");
  return nullopt;
  }
  