Index: lib/Support/CommandLine.cpp
===================================================================
--- lib/Support/CommandLine.cpp
+++ lib/Support/CommandLine.cpp
@@ -1358,8 +1358,6 @@
 
   switch (getNumOccurrencesFlag()) {
   case Optional:
-    if (NumOccurrences > 1)
-      return error("may only occur zero or one times!", ArgName);
     break;
   case Required:
     if (NumOccurrences > 1)
Index: test/tools/llvm-nm/X86/externalonly.test
===================================================================
--- test/tools/llvm-nm/X86/externalonly.test
+++ test/tools/llvm-nm/X86/externalonly.test
@@ -1,4 +1,5 @@
 # RUN: llvm-nm -g %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s
+# RUN: llvm-nm -g -g %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s
 
 # CHECK-NOT: EH_frame0
 # CHECK: _main