Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -2989,6 +2989,7 @@
     Group<clang_ignored_gcc_optimization_f_Group>;
 defm spec_constr_count : BooleanFFlag<"spec-constr-count">, Group<clang_ignored_f_Group>;
 defm stack_check : BooleanFFlag<"stack-check">, Group<clang_ignored_f_Group>;
+defm stack_clash_protection : BooleanFFlag<"stack-clash-protection">, Group<clang_ignored_f_Group>;
 defm strength_reduce :
     BooleanFFlag<"strength-reduce">, Group<clang_ignored_gcc_optimization_f_Group>;
 defm tls_model : BooleanFFlag<"tls-model">, Group<clang_ignored_f_Group>;