================
@@ -1830,6 +1830,9 @@ void ItaniumCXXABI::emitVTableDefinitions(CodeGenVTables 
&CGVT,
   if (VTable->hasInitializer())
     return;
 
+  if (RD->shouldEmitInExternalSource())
+    return;
----------------
dwblaikie wrote:

Yes, and we do emit them in normal builds above -O0 if the vtable is homed 
elsewhere due to a key function for instance - they can be used to allow for 
devirtualization

https://github.com/llvm/llvm-project/pull/75912
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