I now reduced this to a single ~100 lines file that does no dynamic memory allocations. I'm pretty sure I'm not doing something that is undefined behavior. Still getting different results with -O0 / -O2. Even more weirdly, the bug(?) goes away when I remove an assert that only does a simple comparison. Also goes away when I remove certain struct members that are never written or read from.
I'm pretty sure this is indeed a compiler bug 😱
Currently building GCC from source to test against that.
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