ccache cache dir

Hi,

I've noticed that ccache stores it's cached data within /var/tmp, and I'm
wondering whether the developer has chosen not to store the data within
/var/cache as the File System Hierarchy standard states?

The Cache Directory Tagging specification, adhered to by ccache, highlights
the specification of /var/cache for caching purposes (third paragraph):
http://www.brynosaurus.com/cachedir/spec.html

Thanks,

Matthew Millar