windeployqt.exe looks for library in the wrong place

[Christian Ehrlicher]

windeployqt (as also qmake and the cmake scripts) expects that all Qt stuff is innstalled with the same prefix which is not in your case.
So install the Qt6Mqtt stuff with the same prefix as the rest.

[Mesrine]

@Christian-Ehrlicher

Thanks, do you know how to install Qt6Mqtt on a GitHub runner?
And how it is that works for the qtquick application and not for the console application.
For the qtquick application, Qt6Mqtt is not installed as part of Qt and works.
For the Qt-Windows installation are the .dlls installed in the bin folder or in a lib folder?
If installed in a lib folder windeployqt.exe is looking also in the wrong folder.

[Mesrine]

@Mesrine
According to this. I should pass --ignore-library-errors.
But the CMake API it seems that do not allow it.
Where is the source code of windeployqt for qt 6.5.0?

[cristian-adam]

I've opened up https://bugreports.qt.io/browse/QTBUG-116551

I think the CMake API should provide a way to specify arguments to windeployqt and macdeployqt.

[Mesrine]

@cristian-adam Thanks, It is a nice thing to have on the CMake API.

[Mesrine]

@Mesrine

It seems that the generic deploy tool uses file(GET_RUNTIME_DEPENDENCIES) of CMake.

The Qt cmake API allows setting variables like PRE_INCLUDE_REGEXES .

So, I am wondering how to use something like

if(QTDEPLOY)
		qt_generate_deploy_app_script(
			TARGET ${example}
			OUTPUT_SCRIPT deploy_script
			PRE_INCLUDE_REGEXES "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/*"
			)

		install(SCRIPT ${deploy_script})
endif(QTDEPLOY)

I want to set PRE_INCLUDE_REGEXES to the path the MQTT library was installed.
The best will be to use DIRECTORIES but I do not see how to pass this from the QT CMake API.

[cristian-adam]

This is only available for Linux, on Windows and macOS the windeployqt and macdeployqt tools are used.

Woud be nice to have the generic deploy tool, but AFAIK it's not possible.

Please do create a bugreport at https://bugreports.qt.io/

[Mesrine]

@Mesrine This does not make much sense because windeploy.exe what it does is to populate the install folder with the QT dependencies.
Still, I have not found the windeploy source code to see where it is getting that mqttlibrary path.

[Mesrine]

@cristian-adam I see for Linux it is called 'generic Qt deploy tool' and use file(GET_RUNTIME_DEPENDENCIES).
Thanks.

[cristian-adam]

https://code.qt.io/cgit/qt/qtbase.git/tree/src/tools/windeployqt ist the place for the windeployqt source code.

[Mesrine]

@cristian-adam
It seems this part checks if the library is called "Qt6Something" and adds the Qt bin installation directory to the path for the next iteration of the function.