Add -std=c++1y argument, for *highly* experimental C++14 support.

llvm-svn: 166139

clang/lib/Frontend/InitPreprocessor.cpp

@@ -288,6 +288,8 @@ static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
     else if (!LangOpts.GNUMode && LangOpts.Digraphs)
       Builder.defineMacro("__STDC_VERSION__", "199409L");
   } else {
+    // FIXME: LangOpts.CPlusPlus1y
+
     // C++11 [cpp.predefined]p1:
     //   The name __cplusplus is defined to the value 201103L when compiling a
     //   C++ translation unit.