As ccache has not been maintained for a few years and various bugs have been fixed, it seems that the unofficial build of ccache is the currently the one released by Debian. They have 17 patches that they have accumulated and applied to 2.4. I suggest that these are applied and released as a new version of ccache, so that the official repository catches up with what the majority of people are most likely using.
The patches can be viewed here:
The Debian ccache pages:
There are other patches and bugs to consider in the Debian bug tracker:
Gentoo also have a few patches:
The (relevant) patches accumulated by Debian and Gentoo have been applied and will be part of the next release.
(My current plan is to go straight for 3.0 and not release an intermediate 2.5 with just the patches.)
Great. If you are going to have a major version number upgrade, I think it would be a great opportunity to upgrade to GPL v3.0 at the same time.
Yes, GPLv3+ might be a good idea. Thanks for mentioning it.