The feature is being enabled by default even if there is no purpose for it. According to: http://lists.freedesktop.org/archives/systemd-devel/2015-February/028129.html "turn it off during build-time if you don't want it. Use --disable-smack. It is enabled by default, since all features we consider stable are enabled by default unless their library dependencies are missing. Since SMACK so far didn't require any library it hence is effectively always on unless you explicitly turn it off..." Reproducible: Always
What does disabling it accomplish? It seems that Lennart failed to answer that question.
Well, good question. I have not been able to find anything that would suggest anything beyond a check to see if the kernel supports smack, and a slightly smaller binary. I assumed that it changed the runtime behaviour. (Why else make it an optional feature?) But perhaps that assumption was premature. I'll close it as "won't fix". If anybody finds a good reason to argue otherwise they can re-open it.
