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-rw-r--r--libcxx/include/__config4
1 files changed, 4 insertions, 0 deletions
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 239f0a22ce4..a5afbcad797 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -289,4 +289,8 @@ template <unsigned> struct __static_assert_check {};
#define _LIBCPP_STABLE_APPLE_ABI
#endif
+#ifdef __APPLE__
+#define _LIBCPP_WCTYPE_IS_MASK
+#endif
+
#endif // _LIBCPP_CONFIG
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