================
@@ -1194,6 +1194,14 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, 
QualType RetTy,
     }
   }
 
+  if (CGM.getCodeGenOpts().StackProtectorGuardRecord) {
+    if (CGM.getCodeGenOpts().StackProtectorGuard != "global")
+      CGM.getDiags().Report(diag::err_opt_not_valid_without_opt)
+          << "-mstack-protector-guard-record"
+          << "-mstack-protector-guard=global";
+    Fn->addFnAttr("mstackprotector-guard-record");
----------------
arsenm wrote:

Why the m prefix? And should this really be a module flag? Should also be 
documented 

https://github.com/llvm/llvm-project/pull/169317
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