+/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it.
+/// Use to mark functions as uncallable. Member functions with this should
+/// be declared private so that some behavior is kept in C++03 mode.
+///
+/// class DontCopy {
+/// private:
+/// DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION;
+/// DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION;
+/// public:
+/// ...
+/// };
+#if (__has_feature(cxx_deleted_functions) \
+ || defined(__GXX_EXPERIMENTAL_CXX0X__))
+ // No version of MSVC currently supports this.
+#define LLVM_DELETED_FUNCTION = delete
+#else
+#define LLVM_DELETED_FUNCTION
+#endif
+
+/// LLVM_FINAL - Expands to 'final' if the compiler supports it.
+/// Use to mark classes or virtual methods as final.
+#if (__has_feature(cxx_override_control))
+#define LLVM_FINAL final
+#else
+#define LLVM_FINAL
+#endif
+
+/// LLVM_OVERRIDE - Expands to 'override' if the compiler supports it.
+/// Use to mark virtual methods as overriding a base class method.
+#if (__has_feature(cxx_override_control))
+#define LLVM_OVERRIDE override
+#else
+#define LLVM_OVERRIDE
+#endif
+