Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1605,6 +1605,7 @@
 def mno_xsaves : Flag<["-"], "mno-xsaves">, Group<m_x86_Features_Group>;
 def mno_mwaitx : Flag<["-"], "mno-mwaitx">, Group<m_x86_Features_Group>;
 def mno_pku : Flag<["-"], "mno-pku">, Group<m_x86_Features_Group>;
+def mno_separate_stack_seg : Flag<["-"], "mno-separate-stack-seg">, Group<m_x86_Features_Group>;
 
 def munaligned_access : Flag<["-"], "munaligned-access">, Group<m_arm_Features_Group>,
   HelpText<"Allow memory accesses to be unaligned (AArch32/AArch64 only)">;
@@ -1785,6 +1786,7 @@
 def mprfchw : Flag<["-"], "mprfchw">, Group<m_x86_Features_Group>;
 def mrdseed : Flag<["-"], "mrdseed">, Group<m_x86_Features_Group>;
 def mpku : Flag<["-"], "mpku">, Group<m_x86_Features_Group>;
+def mseparate_stack_seg : Flag<["-"], "mseparate-stack-seg">, Group<m_x86_Features_Group>;
 def madx : Flag<["-"], "madx">, Group<m_x86_Features_Group>;
 def msha : Flag<["-"], "msha">, Group<m_x86_Features_Group>;
 def mcx16 : Flag<["-"], "mcx16">, Group<m_x86_Features_Group>;