1 files changed, 8 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index a2d34d41db2..0db17431814 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -971,6 +971,14 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
     }
   }
 
+  if (CGM.getCodeGenOpts().PackedStack) {
+    if (getContext().getTargetInfo().getTriple().getArch() !=
+        llvm::Triple::systemz)
+      CGM.getDiags().Report(diag::err_opt_not_valid_on_target)
+        << "-mpacked-stack";
+    Fn->addFnAttr("packed-stack");
+  }
+
   if (RetTy->isVoidType()) {
     // Void type; nothing to return.
     ReturnValue = Address::invalid();