Import Cobalt 25.master.0.1033734
diff --git a/third_party/llvm-project/libcxx/include/__config b/third_party/llvm-project/libcxx/include/__config
index a5d54d4..40c9deb 100644
--- a/third_party/llvm-project/libcxx/include/__config
+++ b/third_party/llvm-project/libcxx/include/__config
@@ -35,9 +35,9 @@
#ifdef __cplusplus
// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
-// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 16.0.1 == 16.00.01), _LIBCPP_VERSION is
+// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is
// defined to XXYYZZ.
-# define _LIBCPP_VERSION 160000
+# define _LIBCPP_VERSION 170000
# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
@@ -629,7 +629,11 @@
# else
# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
# endif
-# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
+# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
+
+// This macro provides a HIDE_FROM_ABI equivalent that can be applied to extern
+// "C" function, as those lack mangling.
+# define _LIBCPP_HIDE_FROM_ABI_C _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
# ifdef _LIBCPP_BUILDING_LIBRARY
# if _LIBCPP_ABI_VERSION > 1
@@ -802,6 +806,12 @@
# define _LIBCPP_DEPRECATED_IN_CXX20
# endif
+#if _LIBCPP_STD_VER >= 23
+# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED
+#else
+# define _LIBCPP_DEPRECATED_IN_CXX23
+#endif
+
# if !defined(_LIBCPP_HAS_NO_CHAR8_T)
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED
# else
