Cppcheck失败的原因“返回了对自动变量的引用”？

Question

我看到以下Cppcheck，但不明白为什么得到它：

directoryutils.cpp 173 error returnReference false Reference to auto variable returned.

我既不明白为什么会返回auto变量，也不清楚“参考部分”。那是假阳性吗？

标题：static const FilePerApplication &applicationDataDirectoryMapWithoutCurrentVersion();

const CDirectoryUtils::FilePerApplication &CDirectoryUtils::applicationDataDirectoryMapWithoutCurrentVersion()
{
  static const FilePerApplication dirs = [ = ] {
      FilePerApplication directories;
      for (const QFileInfo &info : CDirectoryUtils::applicationDataDirectories())
      {
        .... fill in data ....
        directories.insert(info.filePath(), appInfo);
      }
      return directories; // LINE 173 why auto???
  }();

  return dirs;
}

1. 备注：using FilePerApplication = QMap<QString, CApplicationInfo>;
2. 备注：像这里https://stackoverflow.com/a/9620143/356726一样，给它一个显式的返回类型-> FilePerApplication不会使检查错误失效