为什么设置环境变量 export QT_DEBUG_PLUGINS=1后,不能打印类似如下的报错信息呢? Found metadata in lib /usr/lib64/qt5/plugins/platforms/libqxcb.so, metadata={ "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "xcb" ] }, "className": "QXcb...