Index: lld/trunk/ELF/Driver.cpp
===================================================================
--- lld/trunk/ELF/Driver.cpp
+++ lld/trunk/ELF/Driver.cpp
@@ -223,8 +223,10 @@
       // default action without the LTO hack described above.
       for (const std::pair<MemoryBufferRef, uint64_t> &P :
            getArchiveMembers(MBRef))
-        if (identify_magic(P.first.getBuffer()) != file_magic::bitcode)
+        if (identify_magic(P.first.getBuffer()) != file_magic::bitcode) {
+          error(Path + ": archive has no index; run ranlib to add one");
           return;
+        }
 
       for (const std::pair<MemoryBufferRef, uint64_t> &P :
            getArchiveMembers(MBRef))
Index: lld/trunk/test/ELF/archive-no-index.s
===================================================================
--- lld/trunk/test/ELF/archive-no-index.s
+++ lld/trunk/test/ELF/archive-no-index.s
@@ -0,0 +1,13 @@
+# REQUIRES: x86
+# Tests error on archive file without a symbol table
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux -o %t.o %s
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux -o %t.archive.o %S/Inputs/archive.s
+# RUN: rm -f %t.a
+# RUN: llvm-ar crS %t.a %t.archive.o
+
+# RUN: not ld.lld -o out.wasm %t.o %t.a 2>&1 | FileCheck %s
+
+.globl _start
+_start:
+
+# CHECK: error: {{.*}}.a: archive has no index; run ranlib to add one
Index: lld/trunk/test/ELF/lto/archive-no-index.ll
===================================================================
--- lld/trunk/test/ELF/lto/archive-no-index.ll
+++ lld/trunk/test/ELF/lto/archive-no-index.ll
@@ -26,7 +26,7 @@
 ; RUN: rm -f %t3.a
 ; RUN: llvm-ar crS %t3.a %t3.o
 ; RUN: not ld.lld -o /dev/null -emain %t1.o %t3.a 2>&1 | FileCheck -check-prefix=ERR1 %s
-; ERR1: error: undefined symbol: f
+; ERR1: error: {{.*}}.a: archive has no index; run ranlib to add one
 
 ; RUN: rm -f %t4.a
 ; RUN: llvm-ar cr %t4.a