Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -396,6 +396,12 @@
       CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=O") + OOpt));
   }
 
+  if (const Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
+    StringRef ModelArg = A->getValue();
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-plugin-opt=--code-model=") + ModelArg));
+  }
+
   if (Args.hasArg(options::OPT_gsplit_dwarf)) {
     CmdArgs.push_back(
         Args.MakeArgString(Twine("-plugin-opt=dwo_dir=") +