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Hallo, I am co-author of an open source timetabling software. This software is running many years now on Windows, Linux and MacOS without crashing. So I compiled it with a lot of different compilers and it is always running fine. (with Windows mingw compiler, linux gcc compiler, ...) Now I compiled it on my new Mac and noticed and it is running fine as long as i am compiling it with -o1 or -o2 or -o3 or -ofast or -os or -oz. But as soon as I compile it with -o0, then it crashes with MacOS. It doesn't crash if I compile with -o0 under Linux gcc compiler. I tried to do a minimum example, but as soon as I remove some - in that situation unneeded - code, it is running fine again. So it looks like a memory limit in the compiler or something like that. I don't get it. Any ideas how I can locate and/or fix the bug? You can find the source here: https://lalescu.ro/liviu/fet/forum/index.php?topic=5729.0 I compiled with the latest clang version shipped with latest MacOS Sonoma. I am also attaching the crash report log. Thank you for your help. appleLog.txt.log