1*1d52d5c5SDag-Erling SmørgravDo not attempt to detect if the object tree needs cleaning in part or in 2*1d52d5c5SDag-Erling Smørgravwhole before building. 3*1d52d5c5SDag-Erling SmørgravThis speeds up incremental builds, especially when experimenting with 4*1d52d5c5SDag-Erling Smørgravbuild options, but may cause the build to inexplicably fail or produce 5*1d52d5c5SDag-Erling Smørgravnon-functioning binaries. 6