Index: lld/ELF/SymbolTable.cpp
===================================================================
--- lld/ELF/SymbolTable.cpp
+++ lld/ELF/SymbolTable.cpp
@@ -599,9 +599,14 @@
   for (InputFile *F : SharedFiles) {
     for (StringRef U : cast<SharedFile<ELFT>>(F)->getUndefinedSymbols()) {
       Symbol *Sym = find(U);
-      if (!Sym || !Sym->isDefined())
+      if (!Sym)
         continue;
-      Sym->ExportDynamic = true;
+      if (auto *L = dyn_cast<Lazy>(Sym))
+        if (InputFile *File = L->fetch())
+          addFile<ELFT>(File);
+
+      if (Sym->isDefined())
+        Sym->ExportDynamic = true;
     }
   }
 }
Index: lld/test/ELF/shlib-undefined-archive.s
===================================================================
--- /dev/null
+++ lld/test/ELF/shlib-undefined-archive.s
@@ -0,0 +1,18 @@
+# REQUIRES: x86
+
+# Undefined symbols in a DSO should pull out object files from archives
+# to resolve them.
+
+# RUN: echo '.globl foo' | llvm-mc -filetype=obj -triple=x86_64-linux-gnu -o %t1.o -
+# RUN: ld.lld -shared -o %t.so %t1.o
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64-linux-gnu -o %t2.o %s
+# RUN: llvm-ar cru %t.a %t2.o
+# RUN: ld.lld -o %t.exe %t.a %t.so
+# RUN: llvm-nm -D %t.exe | FileCheck %s
+
+# CHECK: T foo
+
+.globl foo
+foo:
+  ret