More fun with canonical types: The following valid code snippet triggers an ICE on mainline:
=========================================================== typedef const int X __attribute((vector_size(8))); extern const int x[] __attribute((vector_size(8))); X x[] = {}; =========================================================== bug.cc:3: internal compiler error: canonical types differ for identical types const int __vector__ [] and const int __vector__ [] Please submit a full bug report, [etc.] -- Summary: [4.3 regression] ICE with vector attribute Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: ice-on-valid-code, monitored Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: reichelt at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35096