https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71885
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |manu at gcc dot gnu.org --- Comment #16 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- I think the relevant part of the standard may be: C++98 [class.cdtor]: For an object of non-POD class type ... before the constructor begins execution ... referring to any non-static member or base class of the object results in undefined behavior https://gcc.gnu.org/ml/gcc/2016-02/msg00207.html But neither the manual nor the porting_to guide are very clear regarding this. Would it be hard to diagnose such uses? (since any use is forbidden!).