(Fedora only)

CCache is caching every compile process and speeding up repetitive compiler runs by a great amount (half, tenth …)

CCache is in the PATH before the common /bin /usr/bin paths and gets preferred. Usually without problems. If you want to deactivate it set the environment variable.

export CCACHE_DISABLE=1 

Caching Data is saved inside the home directory (~/.ccache) and it can grow to very impressive size. So if you run out of disk space (quota) delete first the multiple GB of the CCache.