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Qt5: QDir::mkpath() fails for /cygdrive/ paths

QDir::mkpath() fails when creating paths that start '/cygdrive/'. This problem is only shown with Qt5 (not Qt4), and only with paths that start '/cygdrive/' (so running from my home directory '~' is fine). This is not a permissions problem, as it works fine with Qt4.

Sample programme is below. Compile for Qt5 as per the comments. 'cd /cygdrive/X' where X is a local drive where you have permissions to create a directory. Run './create_directory new_dir' and it fails to create the directory. Programme works fine when compiled with Qt4.

I am using libQt5Core5-5.4.1-4 and libQt4-4.8.7-1 under cygwin-2.0.4-1. I haven't had chance to try with Qt 5.4.2 (announced yesterday), so apologies in advance if this is fixed already.


// Programme to create a directory.
// Works with Qt4:
// g++ -I/usr/include/qt4 -o create_directory create_directory.cpp -lQtCore
// Fails with Qt5 if run from a path starting '/cygdrive/', otherwise OK:
// g++ -I/usr/include/qt5 -o create_directory create_directory.cpp -lQt5Core

#include <QtCore/QDir>
#include <iostream>

int main(int argc, char** argv)
  if (argc != 2)
    std::cerr << "Syntax: create_directory <name>";
    QDir dir(QDir::currentPath());
    if (!dir.mkpath(argv[1]))
      std::cerr << "Failed to create directory '"
                << argv[1] << "'." << std::endl;
  return 0;

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