Why Does My Statically Built Qt 5 Windows App Crash, and How Can I Fix It?

Deploying Qt 5 App on Windows: Troubleshooting a Static Build Crash

In the quest to deploy Qt 5 applications on Windows, users may encounter unforeseen challenges, as experienced by a developer who shared their difficulties on a programming Q&A forum. Despite successfully deploying on Mac OS X using macdeployqt, the developer faced issues when attempting to distribute a Qt 5 app on Windows.

Traditional Qt4 deployment methods, involving compiling in release mode and copying required DLLs, proved ineffective for Qt5. Even statically building the application failed to resolve the issue, leading it to crash on clean PCs. Moreover, Windows 8/8.1 systems remained unresponsive to the crash, while Windows 7 displayed an error message.

Dependency Walker (depends.exe) analysis revealed no apparent issues with the static build's libraries. However, profiling in depends.exe on Windows 8 yielded an access violation originating from QtGui.dll. The developer sought guidance on potential missing elements or configuration files.

To address this deployment challenge, starting with Qt 5.2, the windeployqt tool was introduced as a solution. By invoking windeployqt from the command line, the required Qt dependencies can be copied alongside the .exe file. Additionally, the --qmldir option can be used to specify the location of QML files, ensuring that necessary QML dependencies are also included.

As a crucial step during testing, the developer is advised to verify the application's completeness by temporarily renaming the Qt directory or testing on a computer without the Qt SDK installed. This precaution helps eliminate the risk of the application relying on files present in the SDK. By following these steps, developers can effectively tackle Qt 5 deployment issues on Windows.

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