Problem using the QPSQL plugin on Windows x64 in Debug mode

[code_talker]

Now it is getting strange:

I removed the QApplication app(argc,argv) line which should be responsible for loading the plugins, startet in release mode and the plugin was still loaded:

//QApplication app(argc,argv);
  MITK_INFO << "QSqlDatabase::drivers(): " << QSqlDatabase::drivers().join(QString("; ")).toLatin1().data() << "\n";

//QApplication app(argc,argv);
  MITK_INFO << "QSqlDatabase::drivers(): " << QSqlDatabase::drivers().join(QString("; ")).toLatin1().data() << "\n";

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Output:

QSqlDatabase::drivers(): QSQLITE; QPSQL7; QPSQL

QSqlDatabase::drivers(): QSQLITE; QPSQL7; QPSQL

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I'm confused, I thought that the plugins are loaded during instantiation of QApplication?