Index: clang/include/clang/Basic/TargetInfo.h
===================================================================
--- clang/include/clang/Basic/TargetInfo.h
+++ clang/include/clang/Basic/TargetInfo.h
@@ -1388,7 +1388,7 @@
   virtual void setAuxTarget(const TargetInfo *Aux) {}
 
   /// Whether target allows debuginfo types for decl only variables.
-  virtual bool allowDebugInfoForExternalVar() const { return false; }
+  virtual bool allowDebugInfoForExternalVar() const { return true; }
 
 protected:
   /// Copy type and layout related info.
Index: clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- clang/lib/CodeGen/CGDebugInfo.cpp
+++ clang/lib/CodeGen/CGDebugInfo.cpp
@@ -4619,6 +4619,8 @@
   assert(CGM.getCodeGenOpts().hasReducedDebugInfo());
   if (D->hasAttr<NoDebugAttr>())
     return;
+  if (!(DebugKind == clang::codegenoptions::FullDebugInfo))
+    return;
 
   auto Align = getDeclAlignIfRequired(D, CGM.getContext());
   llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
Index: llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
===================================================================
--- llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -165,7 +165,12 @@
   }
 
   if (!GV->isDefinition())
+  {
     addFlag(*VariableDIE, dwarf::DW_AT_declaration);
+
+    if (DD->useAllLinkageNames())
+    addLinkageName(*VariableDIE, GV->getLinkageName());
+  }
   else
     addGlobalName(GV->getName(), *VariableDIE, DeclContext);
 
@@ -177,6 +182,7 @@
     addTemplateParams(*VariableDIE, DINodeArray(TP));
 
   // Add location.
+  if (GV->isDefinition())
   addLocationAttribute(VariableDIE, GV, GlobalExprs);
 
   return VariableDIE;