Index: test/tools/llvm-nm/libtool-response-file.test
===================================================================
--- /dev/null
+++ test/tools/llvm-nm/libtool-response-file.test
@@ -0,0 +1,4 @@
+RUN: llvm-nm --help | FileCheck %s
+Check that the output of llvm-nm --help contains the literal text @FILE; this
+indicates to libtool that llvm-nm does support response files.
+CHECK: @FILE
Index: tools/llvm-nm/llvm-nm.cpp
===================================================================
--- tools/llvm-nm/llvm-nm.cpp
+++ tools/llvm-nm/llvm-nm.cpp
@@ -183,6 +183,8 @@
 cl::opt<bool> NoLLVMBitcode("no-llvm-bc",
                             cl::desc("Disable LLVM bitcode reader"));
 
+cl::extrahelp HelpResponse("\nPass @FILE as argument to read options from FILE.\n");
+
 bool PrintAddress = true;
 
 bool MultipleFiles = false;