boost::filesystem::stem() reporting wrong value on some entries (seen on Linux)

[bach@…]

Compiled with gcc on Linux.

Consider the following example with an empty string as path:

  boost::filesystem::path mypath("");
  cout << mypath.parent_path().native() << endl;
  cout << mypath.stem().native() << endl;

This will print out, as expected, two empty strings. If one now changes the path to be analysed into "tmp/", like this:

  boost::filesystem::path mypath("tmp/");
  cout << mypath.parent_path().native() << endl;
  cout << mypath.stem().native() << endl;

then the output will be "tmp" on one line (totally expected and correct) and "." on the next line (totally unexpected and wrong, it should be an empty string).