Diagnosing QDir::rmdir failure

[Violet Giraffe]

I'm using the following code to delete an empty folder on Linux:

@bool removeFolder (const QString& path)
{
QDir dir(path);
assert(dir.exists());
return dir.rmdir(".");
}@

For some reason it sometimes returns false (for specific folders, but those folders don't seem to be wrong in any way). If I subsequently use ::rmdir from <unistd.h> to remove the same folder, it succeeds.
How can I tell why QDir::rmdir is failing?

This never happened on Windows so far, QDir::rmdir just works.

[thEClaw]

Are you certain that a seemingly non-deletable directory does not contain hidden objects (starting with a ".")? QDir::rmdir() cannot handle non-empty directories.

If you are using Qt5, you could use a different function:
@QDir::removeRecursively()@

[Violet Giraffe]

I am certain, I also have this assert and it never triggers:

@assert(dir.entryList(QDir::NoDotAndDotDot | QDir::Hidden | QDir::System).isEmpty());@

And, like I said, ::rmdir deletes the folder and indicates no error. I don't believe it can delete non-empty folders.

If it was Windows I would step into QDir source when debugging and would see why exactly it is failing. Unfortunately, I'm new to Linux and don't know how to make Qt debuggable.