================
@@ -1802,6 +1802,12 @@ void ItaniumCXXABI::emitVTableDefinitions(CodeGenVTables 
&CGVT,
   if (VTable->hasInitializer())
     return;
 
+  // If the class is attached to a C++ named module other than the one
+  // we're currently compiling, the vtable should be defined there.
+  if (Module *M = RD->getOwningModule();
+      M && M->isNamedModule() && M != CGM.getContext().getCurrentNamedModule())
----------------
ChuanqiXu9 wrote:

If we feel this is too long, I can wrap them into a member function of Decl in 
a following patch.

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