Wrong FPC parameter?
https://gitlab.com/freepascal.org/fpc/documentation/-/blob/main/tex/user.tex?ref_type=heads#L1320
I saw an obscure command line parameter here in the documentation and decided to try it out.... but it didn't work... either it's an old parameter and it doesn't work now or I misunderstood in which cases it is allowed to be used (maybe it should be described in a bit more detail?)