diff --git a/llvm/test/tools/llvm-libtool-darwin/ignored-options.test b/llvm/test/tools/llvm-libtool-darwin/ignored-options.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-libtool-darwin/ignored-options.test
@@ -0,0 +1,8 @@
+## This tests some flags are correctly parsed even when they're not handled
+
+# RUN: llvm-libtool-darwin -V -syslibroot foo | FileCheck %s
+# RUN: llvm-libtool-darwin -h | FileCheck --check-prefix=HELP %s
+
+# CHECK: Default target:
+
+# HELP-NOT: syslibroot
diff --git a/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp b/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
--- a/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
+++ b/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
@@ -101,6 +101,8 @@
                                       cl::cat(LibtoolCategory),
                                       cl::init(false));
 
+static cl::opt<std::string> IgnoredSyslibRoot("syslibroot", cl::Hidden);
+
 static const std::array<std::string, 3> StandardSearchDirs{
     "/lib",
     "/usr/lib",