diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 689ecbc..706409d 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1288,7 +1288,7 @@
   }
 }
 
-static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
+static const Tool *SelectToolForJob(Compilation &C, const ToolChain *TC,
                                     const JobAction *JA,
                                     const ActionList *&Inputs) {
   const Tool *ToolForJob = 0;
@@ -1301,17 +1301,19 @@
       !C.getArgs().hasArg(options::OPT_save_temps) &&
       isa<AssembleJobAction>(JA) &&
       Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
-    const Tool &Compiler =
+    const Tool *Compiler =
       TC->SelectTool(cast<JobAction>(**Inputs->begin()));
-    if (Compiler.hasIntegratedAssembler()) {
+    if (!Compiler)
+      return NULL;
+    if (Compiler->hasIntegratedAssembler()) {
       Inputs = &(*Inputs)[0]->getInputs();
-      ToolForJob = &Compiler;
+      ToolForJob = Compiler;
     }
   }
 
   // Otherwise use the tool for the current job.
   if (!ToolForJob)
-    ToolForJob = &TC->SelectTool(*JA);
+    ToolForJob = TC->SelectTool(*JA);
 
   // See if we should use an integrated preprocessor. We do so when we have
   // exactly one input, since this is the only use case we care about
@@ -1324,7 +1326,7 @@
       ToolForJob->hasIntegratedCPP())
     Inputs = &(*Inputs)[0]->getInputs();
 
-  return *ToolForJob;
+  return ToolForJob;
 }
 
 void Driver::BuildJobsForAction(Compilation &C,
@@ -1366,7 +1368,9 @@
   const ActionList *Inputs = &A->getInputs();
 
   const JobAction *JA = cast<JobAction>(A);
-  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
+  const Tool *T = SelectToolForJob(C, TC, JA, Inputs);
+  if (!T)
+    return;
 
   // Only use pipes when there is exactly one input.
   InputInfoList InputInfos;
@@ -1401,8 +1405,8 @@
                        A->getType(), BaseInput);
 
   if (CCCPrintBindings && !CCGenDiagnostics) {
-    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
-                 << " - \"" << T.getName() << "\", inputs: [";
+    llvm::errs() << "# \"" << T->getToolChain().getTripleString() << '"'
+                 << " - \"" << T->getName() << "\", inputs: [";
     for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
       llvm::errs() << InputInfos[i].getAsString();
       if (i + 1 != e)
@@ -1410,8 +1414,8 @@
     }
     llvm::errs() << "], output: " << Result.getAsString() << "\n";
   } else {
-    T.ConstructJob(C, *JA, Result, InputInfos,
-                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
+    T->ConstructJob(C, *JA, Result, InputInfos,
+                    C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
   }
 }