It's faster. I don't move the source code around though, the intermediate build directory cmake writes binaries into is under a tmpfs mount and the install dir

It's faster. I don't move the source code around though, the intermediate build directory cmake writes binaries into is under a tmpfs mount and the install dir is back on disk. Currently has 10gb in it with 30m of uptime. The gain would be less if I was more willing to trust ccache, or if the cmake dependency graph of the project was trustworthy - my default build deletes all the files from the last one.