It mentions “Analysis Caching”, my instance of SonarQube is a bit dated for the next few months potentially. It is version 6.7. I don’t see this caching mentioned in older version documents, at what version did it become available, or was it just never mentioned?
C/C++/Objective-C analysis caching has been introduced in version 6.6 of the sonar-cfamily-plugin, see CPP-2350.
You have a quite old version of SonarQube, you should really consider to update to a newer version. What version of the C/C++/Objective-C analyzer do you have installed?