Why does my application require libQt6OpenGLWidgets.so

Perdrix

I don't use OpenGL so why does that library get linked into my application?

SGaist

Hi,

What are the modules you are using ?

Perdrix

I was specifying:

find_package(Qt6 6.8 REQUIRED COMPONENTS Core Gui Widgets Network Charts LinguistTools)

and had to change that when ldd told me the executable needed both DBus and OpenGLWidgets even though I include no headers for either in my code and didn't explicitly link with then either:

target_link_libraries(DeepSkyStacker PRIVATE
    Qt6::Core
    Qt6::Gui
    Qt6::Widgets
    Qt6::Network
	DeepSkyStackerKernel
    ZClass
)

I suppose it is possible that one of my other dependencies pulled in the OpenGLWidgets stuff, but I'd be very surprised.

target_link_libraries(${PROJECT_NAME} PRIVATE Boost::container)
target_link_libraries(${PROJECT_NAME} PRIVATE Exiv2::exiv2lib)
target_link_libraries(${PROJECT_NAME} PRIVATE expat::expat)
target_link_libraries(${PROJECT_NAME} PRIVATE libraw::raw_r)
target_link_libraries(${PROJECT_NAME} PRIVATE TIFF::TIFF)
target_link_libraries(${PROJECT_NAME} PRIVATE ZLIB::ZLIB)

SGaist

It might be the charts module that triggers this dependencies.

What does DeepSkyStackerKernel use ?

Perdrix

No much apart from QImage and QPixmap

David

SGaist

Silly question but did you do a full rebuild since you changed the CMakefile ?
AFAIK, it should not be need but sometimes...

Perdrix

Yes I have done a full rebuild...

SGaist

Can you create a minimal project that triggers this ?

Perdrix

I can try

Perdrix

OK this is a dependency from QtCharts :(. It requires both Qt6OpenGL and Qt6OpenGLWidgets.

This is true on both Windows and Linux. I'm unclear quite why it needs them but that's why they are getting pulled in.

D.

SGaist

Simply because Qt Charts makes use of both unless built without OpenGL support.