The following valid code snippet triggers an ICE since GCC 3.4.0: =========================================================== template<typename T> struct A { T a, __attribute((unused)) b; }; ===========================================================
bug.cc:3: internal compiler error: in layout_type, at stor-layout.c:1864 Please submit a full bug report, [etc.] Without the variable 'a' I get a warning (which is missing in the case above): bug.cc:3: warning: 'unused' attribute ignored -- Summary: [4.1/4.24.3 regression] ICE with attribute unused in template 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=35098