As far as anything "official", NO_CLEAN (or any of the variations) certainly isn't recommended to do, it has a few caveats you need to be aware of. And they will bite you at some point.What's the official way in FreeBSD 15
make -DWITH_META_MODE {...}Might be easier to NFS mount it? It's what I did for many years, NFS mounted /usr/src and /usr/obj, built world on a "big" machine and installed it on a "small" machine. You must make sure the time is correct on both machines though, or you'll get some weird issues.What command do I need when I copied the entire /usr/obj to another clean system tree?
Shouldn't be any difference, except you don't have to copy everything and can use it immediately. So it should save a bit of time.But what's different then instead of copying everything? /usr/obj nfs-mounted from somewhere changes things?