ccache is fantastic for CI systems. It's very common for commits to only affect part of a build, and ccache allows for clean builds (tear down the build and reb

ccache is fantastic for CI systems. It's very common for commits to only affect part of a build, and ccache allows for clean builds (tear down the build and rebuild from scratch) to still take advantage of previous compilation runs. Just looking at a jenkins machine with ccache I see a >90% hit rate for the cache, with 440k compilations returned from cache in the last 3 months (when stats were reset last).