diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -533,7 +533,9 @@
 #  define _LIBCPP_CRT_FUNC
 #endif
 
-#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
+// Default to no DLL visibility attributes on MinGW, unless
+// requested by defining _LIBCPP_DLLIMPORT.
+#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY) && !defined(_LIBCPP_DLLIMPORT))
 #  define _LIBCPP_DLL_VIS
 #  define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
 #  define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS