Index: include/llvm/LTO/LTO.h
===================================================================
--- include/llvm/LTO/LTO.h
+++ include/llvm/LTO/LTO.h
@@ -146,6 +146,22 @@
       skip();
     }
 
+    /// For COFF weak externals, returns the name of the symbol that is used
+    /// as a fallback if the weak external remains undefined.
+    std::string getCOFFWeakExternalFallback() const {
+      assert((Flags & object::BasicSymbolRef::SF_Weak) &&
+             (Flags & object::BasicSymbolRef::SF_Indirect) &&
+             "symbol is not a weak external");
+      std::string Name;
+      raw_string_ostream OS(Name);
+      SymTab.printSymbolName(OS,
+                             cast<GlobalValue>(
+                                 cast<GlobalAlias>(getGV())
+                                 ->getAliasee()->stripPointerCasts()));
+      OS.flush();
+      return Name;
+    }
+
     /// Returns the mangled name of the global.
     StringRef getName() const { return Name; }