Solved
I found the issue:
I searched for that func in my project folder, but since the problem was in a linked file, i could not find the problem. After scrolling through the problems list, i found where it was. And after a further look, it just said to me where it was to be found. It was declared as extern void *** there, so that got a bit confusing.
Got a bit mad, as it looked the compiler was lying.
Edit:
Dang! I could have found it with right mouse click -> declarations.
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