Index: ELF/LTO.cpp
===================================================================
--- ELF/LTO.cpp
+++ ELF/LTO.cpp
@@ -144,7 +144,11 @@
     // be removed.
     R.Prevailing = !ObjSym.isUndefined() && B->getFile() == &F;
 
-    R.VisibleToRegularObj = Sym->IsUsedInRegularObj ||
+    // Don't strip external symbols in relocatable links.
+    bool ExternalReloc = Config->Relocatable && Sym->computeBinding() != STB_LOCAL &&
+                       Sym->Visibility == STV_DEFAULT;
+
+    R.VisibleToRegularObj = ExternalReloc || Sym->IsUsedInRegularObj ||
                             (R.Prevailing && Sym->includeInDynsym()) ||
                             UsedStartStop.count(ObjSym.getSectionName());
     if (R.Prevailing)