What is ccache? When should I use it when building and reviewing Bitcoin Core PRs? What is ccache? Can you provide some guidance on when to use it for building Bitcoin Core PRs and how to use it?
The tool ccache helps store intermediate compilation results, so if you changes branches often, and rebuild, it can significantly speed up doing so.
To use it, you install ccache for your platform. That's it. The Bitcoin Core configure script will detect its presence, and use it automatically.