diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -495,10 +495,6 @@
 #  define _LIBCPP_NO_EXCEPTIONS
 #endif
 
-#if !(__has_feature(cxx_strong_enums))
-#define _LIBCPP_HAS_NO_STRONG_ENUMS
-#endif
-
 #if __has_feature(cxx_attributes)
 #  define _LIBCPP_NORETURN [[noreturn]]
 #else
@@ -862,7 +858,7 @@
 # define _LIBCPP_USING_IF_EXISTS
 #endif
 
-#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#ifdef _LIBCPP_CXX03_LANG
 #  define _LIBCPP_DECLARE_STRONG_ENUM(x) struct _LIBCPP_TYPE_VIS x { enum __lx
 #  define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \
      __lx __v_; \
@@ -870,10 +866,10 @@
      _LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
      _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} \
      };
-#else  // _LIBCPP_HAS_NO_STRONG_ENUMS
+#else  // _LIBCPP_CXX03_LANG
 #  define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_ENUM_VIS x
 #  define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
-#endif // _LIBCPP_HAS_NO_STRONG_ENUMS
+#endif // _LIBCPP_CXX03_LANG
 
 // _LIBCPP_DEBUG potential values:
 //  - undefined: No assertions. This is the default.
diff --git a/libcxx/include/future b/libcxx/include/future
--- a/libcxx/include/future
+++ b/libcxx/include/future
@@ -400,7 +400,7 @@
 template <>
 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<future_errc> : public true_type {};
 
-#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#ifdef _LIBCPP_CXX03_LANG
 template <>
 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<future_errc::__lx> : public true_type { };
 #endif
@@ -414,7 +414,7 @@
 };
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(launch)
 
-#ifndef _LIBCPP_HAS_NO_STRONG_ENUMS
+#ifndef _LIBCPP_CXX03_LANG
 
 typedef underlying_type<launch>::type __launch_underlying_type;
 
@@ -474,7 +474,7 @@
     __x = __x ^ __y; return __x;
 }
 
-#endif // !_LIBCPP_HAS_NO_STRONG_ENUMS
+#endif // !_LIBCPP_CXX03_LANG
 
 //enum class future_status
 _LIBCPP_DECLARE_STRONG_ENUM(future_status)
diff --git a/libcxx/include/ios b/libcxx/include/ios
--- a/libcxx/include/ios
+++ b/libcxx/include/ios
@@ -403,7 +403,7 @@
 template <>
 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<io_errc> : public true_type { };
 
-#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#ifdef _LIBCPP_CXX03_LANG
 template <>
 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<io_errc::__lx> : public true_type { };
 #endif
diff --git a/libcxx/include/system_error b/libcxx/include/system_error
--- a/libcxx/include/system_error
+++ b/libcxx/include/system_error
@@ -183,7 +183,7 @@
 struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc>
     : true_type { };
 
-#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#ifdef _LIBCPP_CXX03_LANG
 template <>
 struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx>
     : true_type { };
diff --git a/libcxx/test/std/thread/futures/futures.overview/launch.pass.cpp b/libcxx/test/std/thread/futures/futures.overview/launch.pass.cpp
--- a/libcxx/test/std/thread/futures/futures.overview/launch.pass.cpp
+++ b/libcxx/test/std/thread/futures/futures.overview/launch.pass.cpp
@@ -24,7 +24,7 @@
 
 int main(int, char**)
 {
-#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#if TEST_STD_VER < 11
    LIBCPP_STATIC_ASSERT(static_cast<int>(std::launch::any) ==
                  (static_cast<int>(std::launch::async) | static_cast<int>(std::launch::deferred)), "");
 #else
diff --git a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_signed.pass.cpp
@@ -26,7 +26,7 @@
     big = 0xFFFFFFFFFFFFFFFFULL
 };
 
-#if !defined(TEST_HAS_NO_INT128) && !defined(_LIBCPP_HAS_NO_STRONG_ENUMS)
+#if !defined(TEST_HAS_NO_INT128) && TEST_STD_VER >= 11
 enum HugeEnum : __uint128_t
 {
     hugezero
@@ -62,7 +62,7 @@
 #ifndef TEST_HAS_NO_INT128
     test_make_signed< __int128_t, __int128_t >();
     test_make_signed< __uint128_t, __int128_t >();
-# ifndef _LIBCPP_HAS_NO_STRONG_ENUMS
+# if TEST_STD_VER >= 11
     test_make_signed< HugeEnum, __int128_t >();
 # endif
 #endif
diff --git a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
--- a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.sign/make_unsigned.pass.cpp
@@ -26,7 +26,7 @@
     big = 0xFFFFFFFFFFFFFFFFULL
 };
 
-#if !defined(TEST_HAS_NO_INT128) && !defined(_LIBCPP_HAS_NO_STRONG_ENUMS)
+#if !defined(TEST_HAS_NO_INT128) && TEST_STD_VER >= 11
 enum HugeEnum : __int128_t
 {
     hugezero
@@ -63,7 +63,7 @@
 #ifndef TEST_HAS_NO_INT128
     test_make_unsigned<__int128_t, __uint128_t>();
     test_make_unsigned<__uint128_t, __uint128_t>();
-# ifndef _LIBCPP_HAS_NO_STRONG_ENUMS
+# if TEST_STD_VER >= 11
     test_make_unsigned<HugeEnum, __uint128_t>();
 # endif
 #endif