https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62137
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed|2016-08-14 00:00:00 |2021-9-28 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Note clang we get: <source>:4:15: error: redefinition of 'k' for (int k, k < 20; k++); ^ <source>:4:12: note: previous definition is here for (int k, k < 20; k++); ^ <source>:4:17: error: expected ';' in 'for' statement specifier for (int k, k < 20; k++); ^ <source>:4:17: error: expected expression I don't think this is better at all.