The libjava Makefiles are hardwired to use ':' as a CLASSPATH separator. Gcj, however, picks the separator based on system-specific configuration, and so correctly chooses ';' on MinGW. This will cause bootstrap in libjava to fail when the incorrect CLASSPATH separator as used, as it sees all components of the CLASSPATH as a single file, and so cannot find any files.
-- Summary: Incorrect CLASSPATH separator in libjava breaks bootstrap Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: java AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: aaronavay62 at aaronwl dot com CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu dot org GCC target triplet: i686-pc-mingw32 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18104