The C++ generates a broken diagnostic for the following invalid code snippet since GCC 4.0.0:
===================================== template<typename T> struct A { A<__builtin_offsetof(T, x)>(); }; ===================================== bug.cc:3: error: type/value mismatch at argument 1 in template parameter list for 'template<class T> struct A' bug.cc:3: error: expected a type, got '#'offsetof_expr' not supported by dump_expr#<expression error>' -- Summary: [4.1/4.2/4.3 regression] Broken diagnostic: 'offsetof_expr' not supported by dump_expr Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: diagnostic, 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=33842