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diff --git a/include/__type_traits/enable_if.h b/include/__type_traits/enable_if.h
index 77da962..c1d8896 100644
--- a/include/__type_traits/enable_if.h
+++ b/include/__type_traits/enable_if.h
@@ -32,6 +32,12 @@ template <bool _Bp, class _Tp = void>
using enable_if_t = typename enable_if<_Bp, _Tp>::type;
#endif
+// CUDA headers use libc++ internals.
+#ifdef __CUDACC__
+template <bool _Cond, class _Ret = void>
+using __lazy_enable_if _LIBCPP_NODEBUG = __enable_if_t<_Cond, _Ret>;
+#endif
+
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TYPE_TRAITS_ENABLE_IF_H
diff --git a/include/__type_traits/is_constant_evaluated.h b/include/__type_traits/is_constant_evaluated.h
index 05e070a..7907c1f 100644
--- a/include/__type_traits/is_constant_evaluated.h
+++ b/include/__type_traits/is_constant_evaluated.h
@@ -17,15 +17,19 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-#if _LIBCPP_STD_VER >= 20
+#ifndef _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED
+# if _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI inline constexpr bool is_constant_evaluated() noexcept {
return __builtin_is_constant_evaluated();
}
-#endif
+# endif
_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR bool __libcpp_is_constant_evaluated() _NOEXCEPT {
return __builtin_is_constant_evaluated();
}
+#else
+inline _LIBCPP_CONSTEXPR bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; }
+#endif // !_LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED
_LIBCPP_END_NAMESPACE_STD
diff --git a/include/__type_traits/is_nothrow_constructible.h b/include/__type_traits/is_nothrow_constructible.h
index 2f7ed84..678debb 100644
--- a/include/__type_traits/is_nothrow_constructible.h
+++ b/include/__type_traits/is_nothrow_constructible.h
@@ -25,7 +25,7 @@
_LIBCPP_BEGIN_NAMESPACE_STD
// GCC is disabled due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106611
-#if __has_builtin(__is_nothrow_constructible) && !defined(_LIBCPP_COMPILER_GCC)
+#if __has_builtin(__is_nothrow_constructible) && !defined(_LIBCPP_COMPILER_GCC) && !defined(__CUDACC__)
template < class _Tp, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
diff --git a/include/__type_traits/is_reference.h b/include/__type_traits/is_reference.h
index 42853d4..9d85646 100644
--- a/include/__type_traits/is_reference.h
+++ b/include/__type_traits/is_reference.h
@@ -18,7 +18,8 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-#if __has_builtin(__is_lvalue_reference) && __has_builtin(__is_rvalue_reference) && __has_builtin(__is_reference)
+#if __has_builtin(__is_lvalue_reference) && __has_builtin(__is_rvalue_reference) && __has_builtin(__is_reference) && \
+ !defined(__CUDACC__)
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> {};
diff --git a/include/__type_traits/is_same.h b/include/__type_traits/is_same.h
index 9561b7b..5013724 100644
--- a/include/__type_traits/is_same.h
+++ b/include/__type_traits/is_same.h
@@ -18,14 +18,29 @@
_LIBCPP_BEGIN_NAMESPACE_STD
+#if __has_keyword(__is_same) && !defined(__CUDACC__)
+
template <class _Tp, class _Up>
struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> {};
-#if _LIBCPP_STD_VER >= 17
+# if _LIBCPP_STD_VER >= 17
template <class _Tp, class _Up>
inline constexpr bool is_same_v = __is_same(_Tp, _Up);
-#endif
+# endif
+
+#else
+
+template <class _Tp, class _Up>
+struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {};
+template <class _Tp>
+struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {};
+# if _LIBCPP_STD_VER > 14
+template <class _Tp, class _Up>
+inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
+# endif
+
+#endif // __is_same
// _IsSame<T,U> has the same effect as is_same<T,U> but instantiates fewer types:
// is_same<A,B> and is_same<C,D> are guaranteed to be different types, but
// _IsSame<A,B> and _IsSame<C,D> are the same type (namely, false_type).
@@ -34,10 +49,22 @@ inline constexpr bool is_same_v = __is_same(_Tp, _Up);
// (such as in a dependent return type).
template <class _Tp, class _Up>
-using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>;
+using _IsSame = _BoolConstant<
+#if defined(__clang__) && !defined(__CUDACC__)
+ __is_same(_Tp, _Up)
+#else
+ is_same<_Tp, _Up>::value
+#endif
+ >;
template <class _Tp, class _Up>
-using _IsNotSame = _BoolConstant<!__is_same(_Tp, _Up)>;
+using _IsNotSame = _BoolConstant<
+#if defined(__clang__) && !defined(__CUDACC__)
+ !__is_same(_Tp, _Up)
+#else
+ !is_same<_Tp, _Up>::value
+#endif
+ >;
_LIBCPP_END_NAMESPACE_STD
diff --git a/include/__type_traits/remove_cv.h b/include/__type_traits/remove_cv.h
index 2c4e9e4..639a9c4 100644
--- a/include/__type_traits/remove_cv.h
+++ b/include/__type_traits/remove_cv.h
@@ -10,6 +10,8 @@
#define _LIBCPP___TYPE_TRAITS_REMOVE_CV_H
#include <__config>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_volatile.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
@@ -19,10 +21,14 @@ _LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
struct remove_cv {
+#if __has_builtin(__remove_cv)
using type _LIBCPP_NODEBUG = __remove_cv(_Tp);
+#else
+ typedef __remove_volatile_t<__remove_const_t<_Tp> > type;
+#endif
};
-#if defined(_LIBCPP_COMPILER_GCC)
+#if defined(_LIBCPP_COMPILER_GCC) || !__has_builtin(__remove_cv)
template <class _Tp>
using __remove_cv_t = typename remove_cv<_Tp>::type;
#else
diff --git a/include/__type_traits/remove_cvref.h b/include/__type_traits/remove_cvref.h
index 55f894d..0334771 100644
--- a/include/__type_traits/remove_cvref.h
+++ b/include/__type_traits/remove_cvref.h
@@ -28,6 +28,10 @@ struct __remove_cvref_gcc {
template <class _Tp>
using __remove_cvref_t _LIBCPP_NODEBUG = typename __remove_cvref_gcc<_Tp>::type;
+// compatibility with cuda && clang14
+#elif defined(__CUDACC__) || !__has_builtin(__remove_cvref)
+template <class _Tp>
+using __remove_cvref_t _LIBCPP_NODEBUG = __remove_cv_t<__libcpp_remove_reference_t<_Tp> >;
#else
template <class _Tp>
using __remove_cvref_t _LIBCPP_NODEBUG = __remove_cvref(_Tp);
@@ -39,7 +43,11 @@ using __is_same_uncvref = _IsSame<__remove_cvref_t<_Tp>, __remove_cvref_t<_Up> >
#if _LIBCPP_STD_VER >= 20
template <class _Tp>
struct remove_cvref {
+#if defined(__CUDACC__) || !__has_builtin(__remove_cvref)
+ using type _LIBCPP_NODEBUG = __remove_cvref_t<_Tp>;
+#else
using type _LIBCPP_NODEBUG = __remove_cvref(_Tp);
+#endif
};
template <class _Tp>
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