diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index e57f7e8..1667743 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -864,6 +864,8 @@
     CmdArgs.append(OutputArgs.begin(), OutputArgs.end());
   }
   
+  Args.AddAllArgs(CmdArgs, options::OPT_d_Group);
+
   const char *CC1Name = getCC1Name(Inputs[0].getType());
   const char *Exec = 
     Args.MakeArgString(getToolChain().GetProgramPath(C, CC1Name).c_str());