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-rw-r--r--libcxx/include/version4
1 files changed, 3 insertions, 1 deletions
diff --git a/libcxx/include/version b/libcxx/include/version
index 1037ee5df40..948f64512c9 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -222,7 +222,9 @@ __cpp_lib_void_t 201411L <type_traits>
// # define __cpp_lib_destroying_delete 201806L
# define __cpp_lib_erase_if 201811L
// # define __cpp_lib_generic_unordered_lookup 201811L
-// # define __cpp_lib_is_constant_evaluated 201811L
+# if !defined(_LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED)
+# define __cpp_lib_is_constant_evaluated 201811L
+# endif
// # define __cpp_lib_list_remove_return_type 201806L
// # define __cpp_lib_ranges 201811L
// # define __cpp_lib_three_way_comparison 201711L
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