I remember that Cedric or someone else tried this as default for our efl builds a long time ago. I kind of remember we had some problem with stale caches. But I don't remember the details.
Do you have any number on the time improvement this brings?
To make it clear, I am not against this change. I just see some risk in it and wonder how much the benefit actually is.
The ccache keyword is no longer needed? It does nothing else besides: directories: - $HOME/.ccache ?