This is from https://bugzilla.redhat.com/show_bug.cgi?id=297961
The problem is that .class files can now (as of Java 1.5) contain classes whose name contains a hyphen. The mangling used to generate internal labels in gcj passes these hyphens through to the assembler rather than mangling them. -- Summary: gcj generates assembler errors Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: java AssignedTo: aph at gcc dot gnu dot org ReportedBy: aph at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33639