Description:

Programs that use opencascade crash on my machine. My guess is that this happens due to incompatible Qt versions, but I was not able to build the opencascade package myself (CMake fails).

Here is the FreeCAD output:

FreeCAD 0.20.1, Libs: 0.20.1R29410 (Git)
© Juergen Riegel, Werner Mayer, Yorik van Havre and others 2001-2022
FreeCAD is free and open-source software licensed under the terms of LGPL2+ license.
FreeCAD wouldn't be possible without FreeCAD community.
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#### # # # # # # # ##### # #
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# # # # # # # # # ## ## ##
# # #### #### ### # # #### ## ## ##

[1] 7612 IOT instruction (core dumped) freecad

Running it inside GDB reveals that the crash occurs in a qt_assert call.

I also tried an example from the opencascade project that I ripped out of the source tree, which also crashes:

Cannot mix incompatible Qt library (5.15.5) with this library (5.15.6)
[1] 8324 IOT instruction (core dumped) ./build/Tutorial

GDB reveals that it is also a qt_assert call that causes the crash.

Steps to reproduce (freecad):
1. install opencascade and freecad
2. execute freecad in a shell

Steps to reproduce (sample project):
1. install opencascade
2. extract the attached archive ($ tar -xf 2022-09-24\ OCCT\ Tutorial\ Qt.tar)
3. create a build directory ($ mkdir 2022-09-24\ OCCT\ Tutorial\ Qt/build)
4. cd into the build directory ($ cd 2022-09-24\ OCCT\ Tutorial\ Qt/build)
5. build the project ($ cmake .. && cmake --build .)
6. run the application ($ ./Tutorial)