https://issues.dlang.org/show_bug.cgi?id=16289
--- Comment #1 from Martin Nowak <c...@dawg.eu> --- It's possible to use cpp_ulong which get's the correct mangling, but it's fairly unfriendly to use. https://github.com/dlang/druntime/blob/fb0dafb741d33ae030c2e7a96bee2c61aa4d3cb4/src/core/stdc/config.d#L91 --