[PATCH v3 2/2] libstdc++: Use _GLIBCXX_HAS_BUILTIN_TRAIT

[Ken Matsui via Gcc-patches]

This patch uses _GLIBCXX_HAS_BUILTIN_TRAIT macro instead of
__has_builtin in the type_traits header. This macro supports to toggle
the use of built-in traits in the type_traits header through
_GLIBCXX_NO_BUILTIN_TRAITS macro, without needing to modify the
source code.

libstdc++-v3/ChangeLog:

        * include/std/type_traits (__has_builtin): Replace with ...
        (_GLIBCXX_HAS_BUILTIN): ... this.

Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/libstdc++-v3/include/std/type_traits 
b/libstdc++-v3/include/std/type_traits
index 9f086992ebc..12423361b6e 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -1411,7 +1411,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     : public __bool_constant<__is_base_of(_Base, _Derived)>
     { };
 
-#if __has_builtin(__is_convertible)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__is_convertible)
   template<typename _From, typename _To>
     struct is_convertible
     : public __bool_constant<__is_convertible(_From, _To)>
@@ -1462,7 +1462,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #if __cplusplus >= 202002L
 #define __cpp_lib_is_nothrow_convertible 201806L
 
-#if __has_builtin(__is_nothrow_convertible)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__is_nothrow_convertible)
   /// is_nothrow_convertible_v
   template<typename _From, typename _To>
     inline constexpr bool is_nothrow_convertible_v
@@ -1537,7 +1537,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { using type = _Tp; };
 
   /// remove_cv
-#if __has_builtin(__remove_cv)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__remove_cv)
   template<typename _Tp>
     struct remove_cv
     { using type = __remove_cv(_Tp); };
@@ -1606,7 +1606,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Reference transformations.
 
   /// remove_reference
-#if __has_builtin(__remove_reference)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__remove_reference)
   template<typename _Tp>
     struct remove_reference
     { using type = __remove_reference(_Tp); };
@@ -2963,7 +2963,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       template<typename _Tp,
               bool _Nothrow = noexcept(_S_conv<_Tp>(_S_get())),
               typename = decltype(_S_conv<_Tp>(_S_get())),
-#if __has_builtin(__reference_converts_from_temporary)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__reference_converts_from_temporary)
               bool _Dangle = __reference_converts_from_temporary(_Tp, _Res_t)
 #else
               bool _Dangle = false
@@ -3420,7 +3420,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
    */
 #define __cpp_lib_remove_cvref 201711L
 
-#if __has_builtin(__remove_cvref)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__remove_cvref)
   template<typename _Tp>
     struct remove_cvref
     { using type = __remove_cvref(_Tp); };
@@ -3515,7 +3515,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
     : public bool_constant<is_unbounded_array_v<_Tp>>
     { };
 
-#if __has_builtin(__is_layout_compatible)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__is_layout_compatible)
 
   /// @since C++20
   template<typename _Tp, typename _Up>
@@ -3529,7 +3529,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
     constexpr bool is_layout_compatible_v
       = __is_layout_compatible(_Tp, _Up);
 
-#if __has_builtin(__builtin_is_corresponding_member)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__builtin_is_corresponding_member)
 #define __cpp_lib_is_layout_compatible 201907L
 
   /// @since C++20
@@ -3540,7 +3540,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
 #endif
 #endif
 
-#if __has_builtin(__is_pointer_interconvertible_base_of)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__is_pointer_interconvertible_base_of)
   /// True if `_Derived` is standard-layout and has a base class of type 
`_Base`
   /// @since C++20
   template<typename _Base, typename _Derived>
@@ -3554,7 +3554,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
     constexpr bool is_pointer_interconvertible_base_of_v
       = __is_pointer_interconvertible_base_of(_Base, _Derived);
 
-#if __has_builtin(__builtin_is_pointer_interconvertible_with_class)
+#if 
_GLIBCXX_HAS_BUILTIN_TRAIT(__builtin_is_pointer_interconvertible_with_class)
 #define __cpp_lib_is_pointer_interconvertible 201907L
 
   /// True if `__mp` points to the first member of a standard-layout type
@@ -3590,8 +3590,8 @@ template<typename _Ret, typename _Fn, typename... _Args>
   template<typename _Tp>
     inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value;
 
-#if __has_builtin(__reference_constructs_from_temporary) \
-  && __has_builtin(__reference_converts_from_temporary)
+#if _GLIBCXX_HAS_BUILTIN_TRAIT(__reference_constructs_from_temporary) \
+  && _GLIBCXX_HAS_BUILTIN_TRAIT(__reference_converts_from_temporary)
 
 #define __cpp_lib_reference_from_temporary 202202L
 
@@ -3632,7 +3632,7 @@ template<typename _Ret, typename _Fn, typename... _Args>
   template<typename _Tp, typename _Up>
     inline constexpr bool reference_converts_from_temporary_v
       = reference_converts_from_temporary<_Tp, _Up>::value;
-#endif // __has_builtin for reference_from_temporary
+#endif // _GLIBCXX_HAS_BUILTIN_TRAIT for reference_from_temporary
 #endif // C++23
 
 #if _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED
-- 
2.41.0