Index: libcxx/include/__locale
===================================================================
--- libcxx/include/__locale
+++ libcxx/include/__locale
@@ -1493,6 +1493,8 @@
 
     ~__narrow_to_utf8();
 
+    void other_function();
+
     template <class _OutputIterator, class _CharT>
     _LIBCPP_INLINE_VISIBILITY
     _OutputIterator
Index: libcxx/src/locale.cpp
===================================================================
--- libcxx/src/locale.cpp
+++ libcxx/src/locale.cpp
@@ -4359,6 +4359,10 @@
 {
 }
 
+void __narrow_to_utf8<16>::other_function()
+{
+}
+
 // __narrow_to_utf8<32>
 
 __narrow_to_utf8<32>::~__narrow_to_utf8()