================
@@ -1046,6 +1046,15 @@ CodeGenModule::getVTableLinkage(const CXXRecordDecl *RD) 
{
   if (!RD->isExternallyVisible())
     return llvm::GlobalVariable::InternalLinkage;
 
+  // Previously we'll decide the linkage of the vtable by the linkage
+  // of the key function. But within modules, the concept of key functions
+  // becomes meaningless. So the linkage of the vtable should always be
+  // external if the class is externally visible.
+  //
+  // TODO: How about the case of AppleKext, DLLExportAttr and DLLImportAttr.
----------------
ChuanqiXu9 wrote:

I've updated the comments. And I'd like to leave the simplification to later 
patches.

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