driver.cpp

 /// Compute the desired OpenMP runtime from the flags provided.
 Driver::OpenMPRuntimeKind Driver::getOpenMPRuntime(const ArgList &Args) const {
-  StringRef RuntimeName(CLANG_DEFAULT_OPENMP_RUNTIME);
+  OptValue RuntimeName = CLANG_DEFAULT_OPENMP_RUNTIME;
 
   const Arg *A = Args.getLastArg(options::OPT_fopenmp_EQ);
   if (A)
-    RuntimeName = A->getValue();
-
-  auto RT = llvm::StringSwitch<OpenMPRuntimeKind>(RuntimeName)
-                .Case("libomp", OMPRT_OMP)
-                .Case("libgomp", OMPRT_GOMP)
-                .Case("libiomp5", OMPRT_IOMP5)
-                .Default(OMPRT_Unknown);
-
-  if (RT == OMPRT_Unknown) {
+    RuntimeName = A->getEnumValue();
+
+  switch (RuntimeName) {
+  case options::VALUE_fopenmp_EQ::libomp:
+    return OMPRT_OMP;
+  case options::VALUE_fopenmp_EQ::libgomp:
+    return OMPRT_GOMP;
+  case options::VALUE_fopenmp_EQ::libiomp5:
+    return OMPRT_IOMP5
+  default:
     if (A)
       Diag(diag::err_drv_unsupported_option_argument)
           << A->getOption().getName() << A->getValue();
     else
       // FIXME: We could use a nicer diagnostic here.
       Diag(diag::err_drv_unsupported_opt) << "-fopenmp";
+    return RT;
   }
-
-  return RT;
 }