The C standard leaves a lot of UB/implementation specific behavior.
I wish C were that simple and well defined. : discussed in the first paragraph here: I've never used Lazarus or FPC beyond just opening it up and playing with it in years past, but it is interesting how much that ecosystem seems to offer. (C code also isn't perfectly portable by any stretch of the imagination, so just having some random C compiler for your platform of choice and some emitted C code doesn't really guarantee that you'll end up with a compatible, working solution.) Even relatively new and/or niche architectures like RISC-V and Xtensa appear to be supported by FPC. I'm skeptical that targeting C opens up any meaningful additional platform support beyond what FPC natively supports.
LLVM really means nothing for FPC's portability story at this point, as far as I can tell. The list of supported platforms for FPC is pretty impressive, whereas LLVM support in FPC appears to be very new, and FPC has very limited platform support using LLVM anyways.
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