Parsed syntax cache save location

[Aleksey Midenkov]

Where KDevelop stores cache of parsed sources? Why it doesn't store it
in project location (.kdev4)? I noticed that it reparses project after
some time passed which makes me believe that it does cache aging.
Anyway, the best choice is to store cache into .kdev4 with infinite
lifetime, because: 1. parsing of long project takes about an hour and
2. there is no need to keep cache of deleted projects. Is it possible
to set this in configuration?