https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110622
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Mathieu Malaterre from comment #5) > > Does adding -fexcess-precision=standard help? What about -ffloat-store ? > > highway is c++ only. Those flags are C only No they are not. -fexcess-precision=standard C++ was added for GCC 13. -ffloat-store is generic middle-end option and has been supported by all front-ends since at least GCC 3.