Index: libcxx/include/string
===================================================================
--- libcxx/include/string
+++ libcxx/include/string
@@ -1834,6 +1834,9 @@
 #endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 
 template <class _CharT, class _Traits, class _Allocator>
+#ifndef _LIBCPP_BUILDING_STRING
+inline _LIBCPP_INLINE_VISIBILITY
+#endif
 basic_string<_CharT, _Traits, _Allocator>::~basic_string()
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
Index: libcxx/src/string.cpp
===================================================================
--- libcxx/src/string.cpp
+++ libcxx/src/string.cpp
@@ -7,6 +7,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+// For keeping the definition of ~basic_string in this translation unit.
+#define _LIBCPP_BUILDING_STRING
+
 #include "string"
 #include "cstdlib"
 #include "cwchar"