Yes, you are correct. The QCoreApplication constructor in Qt is responsible for initializing various components, such as loading plugins and setting up the event system. If something fails during this initialization process, it can lead to issues like the “Cannot be used without QApplication” error.
In dynamic builds, the necessary shared libraries (.so files) are typically present, so the initialization process can proceed correctly. However, in static builds, all dependencies must be properly linked at compile time. If any required dependencies are missing or not properly linked, it can cause errors like the one you mentioned.
To resolve this issue, ensure that all required Qt plugins and dependencies are properly included and linked in your project. Additionally, make sure that the necessary configuration files (such as qt.conf) are set up correctly to locate the plugins at runtime.
If you’re encountering this issue specifically with a static build of Qt, double-check your build configuration and ensure that all necessary components are included and linked correctly.
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