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-rw-r--r--libcxx/include/cstdlib2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcxx/include/cstdlib b/libcxx/include/cstdlib
index 298040e3f49..55e15c82192 100644
--- a/libcxx/include/cstdlib
+++ b/libcxx/include/cstdlib
@@ -147,9 +147,11 @@ using ::ldiv;
#undef lldiv
using ::lldiv;
#endif // _LIBCPP_HAS_NO_LONG_LONG
+#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::mblen;
using ::mbtowc;
using ::wctomb;
+#endif
using ::mbstowcs;
using ::wcstombs;
#ifdef _LIBCPP_HAS_QUICK_EXIT
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