It appears that make clean (on a native bootstrap) always fails for me. After make clean on a tree containing a build interrupted in stage 2, it fails trying to make clean in stage 3 gcc. After make clean on a successfully-completed bootstrap tree, it fails trying to make clean in stage 4 gcc.
-- Summary: make clean fails Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: bonzini at gnu dot org ReportedBy: aoliva at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25790