https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121386
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2025-08-03 Ever confirmed|0 |1 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- #ifndef SIZE_MAX #define SIZE_MAX (~(size_t)0) #endif Yes that does not work in preprocess mode. But maybe this is a flex bug.