On Linux/ia32, revision 153024 has many failures: http://gcc.gnu.org/ml/gcc-regression/2009-10/msg00193.html
It may be caused by revision 153023: http://gcc.gnu.org/ml/gcc-cvs/2009-10/msg00676.html -- Summary: [4.5 Regression] Many libstdc++ failures Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hjl dot tools at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41773