Add a testcase for svn r153854.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/apple-kext-i386.cpp b/test/Driver/apple-kext-i386.cpp
index c82cd87..6c53607 100644
--- a/test/Driver/apple-kext-i386.cpp
+++ b/test/Driver/apple-kext-i386.cpp
@@ -40,3 +40,8 @@
// CHECK-UNSUPPORTED2: cc1plus"
// CHECK-UNSUPPORTED2-NOT: "-Wconstant-logical-operand"
+
+// Check that --serialize-diagnostics does not cause an "argument unused" error.
+// RUN: %clang -target i386-apple-darwin10 \
+// RUN: -Werror -Wall -Wno-comment -fapple-kext \
+// RUN: --serialize-diagnostics %t.dia -c %s