Qt6 application mysteriously links to Qt5 library

[pixtopo]

Hello.

I am developing a desktop application based on Qt6 on Rocky Linux 8.

The application itself now works fine in my environment.
But strangely, it links to multiple Qt5 dynamic libraries located in /lib64.

Granted, previously I was using Qt5, but this application is being built with QtCreator specifying only Qt 6.4.2 as the kit.

When I check the dependencies with ldd, I see that my own small DLL is linked to libQt5Core etc.

libQt5OpenGL.so.5 => /lib64/libQt5OpenGL.so.5 (0x00007f7f699a7000)
libQt5Widgets.so.5 => /lib64/libQt5Widgets.so.5 (0x00007f7f690d1000)
libQt5Multimedia.so.5 => /lib64/libQt5Multimedia.so.5 (0x00007f7f68dbf000)
libQt5Gui.so.5 => /lib64/libQt5Gui.so.5 (0x00007f7f685c6000)
libQt5Network.so.5 => /lib64/libQt5Network.so.5 (0x00007f7f681fa000)
libQt5Sql.so.5 => /lib64/libQt5Sql.so.5 (0x00007f7f67fab000)
libQt5Concurrent.so.5 => /lib64/libQt5Concurrent.so.5 (0x00007f7f67da4000)
libQt5Core.so.5 => /lib64/libQt5Core.so.5 (0x00007f7f67611000)

However, no matter how many times I review the settings, I am not using Qt5. I've been struggling with this for days now.

If anyone has any idea why this is happening, could you give me a hint?

Ryocchin

[JonB]

@pixtopo
Make sure you are not running ldd on an existing, old executable for Qt5 lying around. Check the timestamp on the file you are examining. From Creator show the complete linker command being run,