@@ -636,7 +636,7 @@ namespace std
# if __GNUC__ >= 9
# define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
# endif
-#elif defined(__is_identifier)
+#elif defined(__is_identifier) && defined(__has_builtin)
// For non-GNU compilers:
# if ! __is_identifier(__has_unique_object_representations)
# define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
@@ -644,10 +644,10 @@ namespace std
# if ! __is_identifier(__is_aggregate)
# define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
# endif
-# if ! __is_identifier(__builtin_launder)
+# if __has_builtin(__builtin_launder)
# define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
# endif
-# if ! __is_identifier(__builtin_is_constant_evaluated)
+# if __has_builtin(__builtin_is_constant_evaluated)
# define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
# endif
#endif // GCC