On Friday, 31 October 2025 at 21:43:26 UTC, CRy386i wrote: > I have confusion what's this mean? Is it use specific linking > thing for specific system or it's just api thing or abi? > > What does mean "System"? `extern(System)` is `extern(Windows)` on Windows and `extern(C)` everywhere else. It is an ABI thing, not just a linker thing.