r324915 - Further cleanup to Driver mode code, as suggested by dblaikie [NFC]

[Erich Keane via cfe-commits]

Author: erichkeane
Date: Mon Feb 12 09:47:01 2018
New Revision: 324915

URL: http://llvm.org/viewvc/llvm-project?rev=324915&view=rev
Log:
Further cleanup to Driver mode code, as suggested by dblaikie [NFC]

Modified:
    cfe/trunk/lib/Driver/Driver.cpp

Modified: cfe/trunk/lib/Driver/Driver.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Driver.cpp?rev=324915&r1=324914&r2=324915&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Driver.cpp (original)
+++ cfe/trunk/lib/Driver/Driver.cpp Mon Feb 12 09:47:01 2018
@@ -148,15 +148,13 @@ void Driver::setDriverModeFromOption(Str
     return;
   StringRef Value = Opt.drop_front(OptName.size());
 
-  auto M = llvm::StringSwitch<llvm::Optional<DriverMode>>(Value)
-                           .Case("gcc", GCCMode)
-                           .Case("g++", GXXMode)
-                           .Case("cpp", CPPMode)
-                           .Case("cl", CLMode)
-                           .Default(None);
-
-  if (M)
-    Mode = M.getValue();
+  if (auto M = llvm::StringSwitch<llvm::Optional<DriverMode>>(Value)
+                   .Case("gcc", GCCMode)
+                   .Case("g++", GXXMode)
+                   .Case("cpp", CPPMode)
+                   .Case("cl", CLMode)
+                   .Default(None))
+    Mode = *M;
   else
     Diag(diag::err_drv_unsupported_option_argument) << OptName << Value;
 }