================
@@ -14,16 +14,30 @@
#include <__type_traits/decay.h>
#include <__type_traits/is_same.h>
#include <__type_traits/remove_cvref.h>
+#include <__type_traits/type_identity.h>
#include <__type_traits/void_t.h>
#include <__utility/declval.h>
+#include <__utility/empty.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
-#if _LIBCPP_STD_VER >= 20
+#if __has_builtin(__builtin_common_type)
+
+template <class... _Args>
+struct common_type;
+
+template <class... _Args>
+using __common_type_t = typename common_type<_Args...>::type;
+
+template <class... _Args>
+struct common_type : __builtin_common_type<__common_type_t, __type_identity,
__empty, _Args...> {};
----------------
philnik777 wrote:
@ldionne I think you actually want to export `__type_traits/type_identity.h`
and `__utility/empty.h`, since the alias resolves to one of these types in the
end.
https://github.com/llvm/llvm-project/pull/99473
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