https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111436
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- You are type punning and that will almost definitely cause undefined code due to alias violations. You could use memcpy instead of the which will (almost; standard layout structures [or POD for pre C++11]) always work.