Qt app consistently crashing on OS X Monterey (12.6)

SGaist

Hi,

Are you using a custom cursor in your application ?

JoeCFD

It looks like png plugin fails. It could be system png plugin has bug. Can you try Qt png plugin:
https://doc.qt.io/qt-5/plugins-howto.html#static-plugins

TheFlyingMooseMan

@SGaist a database cursor? Nope. Not sure what other cursors are out there.

SGaist

No, a mouse cursor.

TheFlyingMooseMan

@SGaist Oh...! No, not using a custom mouse cursor.

TheFlyingMooseMan

@JoeCFD Thanks for the suggestion -- do I follow instructions for static plugin.

TheFlyingMooseMan

@JoeCFD Not sure how this is all to work automagically. The documentation states:

To cause static plugins actually being linked and instantiated, Q_IMPORT_PLUGIN() macros are also needed in application code, but those are automatically generated by qmake and added to your application project.

However, after recreating the project (including doing a run qmake) I don't see any references in the generated Qt code in the build directory. Am I still supposed to do a call to Q_IMPORT_PLUGIN() somewhere in my code?

Thanks for any help or pointers.

Roy

zaidmughal

This post is deleted!

TheFlyingMooseMan

@zaidmughal I am trying to. I have no idea how to accomplish this. Please see my other post about leveraging this Qt plug-in.

SGaist

Can you provide the exact Qt version you are using ?
Can you provide a minimal compilable example that shows this behaviour ?

TheFlyingMooseMan

@SGaist that would take a lot of time and Murphy's law (and experience) tells me that this bug won't appear again.
I do have some questions on how to include plug-ins -- not sure if I need to call Q_IMPORT_PLUGIN somewhere in my code, and with what parameters. Unlike the documentation stated, I don't see any generated code that calles Q_IMPORT_PLUGIN anywhere.

This is the Qt version in use:

SGaist

That's the Qt Creator version. It has nothing to do with the Qt Kit you are using to build your application.

Q_IMPORT_PLUGIN is to be used when working in a static build context.

TheFlyingMooseMan

This post is deleted!

TheFlyingMooseMan

@SGaist Got it. Looks like 5.15.2 is used.
Also, I guess I am using a 'static build context' -- what is the exact parameter to be given to Q_IMPORT_PLUGIN to use the Qt PNG plugin?

SGaist

Something like Q_IMPORT_PLUGIN(qpng).

TheFlyingMooseMan

@SGaist said in Qt app consistently crashing on OS X Monterey (12.6):

Q_IMPORT_PLUGIN(qpng)

Anything else I need to do?
Am getting link errors as follows:

  "qt_static_plugin_qpng()", referenced from:
      main::StaticqpngPluginInstance::StaticqpngPluginInstance() in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am doing this in my main.cpp.
I also think that Qt does NOT ship with a png plugin.
I can't believe I am the only/first one to do something like that.