Add support for -stdlib=libc++ in the NetBSD toolchain.

llvm-svn: 180766
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 040b6f9..3afd8dd 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -474,6 +474,11 @@
   virtual bool IsMathErrnoDefault() const { return false; }
   virtual bool IsObjCNonFragileABIDefault() const { return true; }
 
+  virtual CXXStdlibType GetCXXStdlibType(const ArgList &Args) const;
+
+  virtual void AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
+                                            ArgStringList &CC1Args) const;
+
 protected:
   virtual Tool *buildAssembler() const;
   virtual Tool *buildLinker() const;