While looking into a testsuite failure when I folded while expanding, I found gcc.c-torture/execute/920612-1.c failed because it depends on overflow of signed integer being undefined.
-- Summary: gcc.c-torture/execute/920612-1.c depends on overflow being defined Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: testsuite AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31290