https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103323
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- sin is a reserved symbol in c, you need to use -fno-builtins if you don't want the optimization.