Qt 5 Core Compatibility APIs

The Qt 5 Core Compat module contains the Qt Core APIs which will be no longer supported in Qt 6 and therefore were removed from Qt 6. The module is provided to facilitate the transition to Qt 6.

Using the Module

Using a Qt module requires linking against the module library, either directly or through other dependencies. Several build tools have dedicated support for this, including CMake and qmake.

Building with CMake

Use the find_package() command to locate the needed module components in the Qt6 package:

find_package(Qt6 COMPONENTS Core5Compat REQUIRED)
target_link_libraries(mytarget PUBLIC Qt6::Core5Compat)

See also the Build with CMake overview.

Building with qmake

To configure the module for building with qmake, add the module as a value of the QT variable in the project's .pro file:

QT += core5compat

Licenses and Attributions

Qt 5 Core Compat is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses: The GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.

Furthermore, Qt 5 Core Compat in Qt 6.0.1 does contain third party modules under following permissive licenses:

© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.