diff --git a/llvm/test/FrontendC/unnamed-addr.c b/llvm/test/FrontendC/unnamed-addr.c
new file mode 100644
index 0000000000000000000000000000000000000000..01a45d2fcb89f366c1b2439206a48982e14b50e6
--- /dev/null
+++ b/llvm/test/FrontendC/unnamed-addr.c
@@ -0,0 +1,91 @@
+// RUN: %llvmgcc -S %s -o - | FileCheck %s
+// <rdar://problem/9402870>
+typedef struct __TestResult TestResult;
+typedef struct __TestResult* TestResultRef;
+
+typedef struct __TestImplement TestImplement;
+typedef struct __TestImplement* TestImplementRef;
+
+typedef char*(*TestNameFunction)(void*);
+typedef void(*TestRunFunction)(void*,TestResult*);
+typedef int(*TestCountTestCasesFunction)(void*);
+
+struct __TestImplement {
+    TestNameFunction name;
+    TestRunFunction run;
+    TestCountTestCasesFunction countTestCases;
+};
+
+typedef struct __Test Test;
+typedef struct __Test* TestRef;
+
+struct __Test {
+    TestImplement* isa;
+};
+
+typedef struct __TestCase TestCase;
+typedef struct __TestCase* TestCaseRef;
+
+struct __TestCase {
+    TestImplement* isa;
+    const char *name;
+    void(*setUp)(void);
+    void(*tearDown)(void);
+    void(*runTest)(void);
+};
+
+extern const TestImplement TestCaseImplement;
+
+typedef struct __TestFixture TestFixture;
+typedef struct __TestFixture* TestFixtureRef;
+
+struct __TestFixture {
+    const char *name;
+    void(*test)(void);
+};
+
+typedef struct __TestCaller TestCaller;
+typedef struct __TestCaller* TestCallerRef;
+
+struct __TestCaller {
+    TestImplement* isa;
+    const char *name;
+    void(*setUp)(void);
+    void(*tearDown)(void);
+    int numberOfFixtuers;
+    TestFixture *fixtuers;
+};
+
+extern const TestImplement TestCallerImplement;
+
+void PassToFunction(const TestImplement*);
+
+const char* TestCaller_name(TestCaller* self) {
+  return self->name;
+}
+
+void TestCaller_run(TestCaller* self,TestResult* result) {
+  TestCase cs = { (TestImplement*)&TestCaseImplement, 0, 0, 0, 0, };
+  int i;
+  cs.setUp = self->setUp;
+  cs.tearDown = self->tearDown;
+  for (i=0; i<self->numberOfFixtuers; i++) {
+    cs.name = self->fixtuers[i].name;
+    cs.runTest = self->fixtuers[i].test;
+    ((Test*)(void *)&cs)->isa->run((void *)&cs,result);
+  }
+}
+
+int TestCaller_countTestCases(TestCaller* self) {
+  PassToFunction(&TestCallerImplement);
+  return self->numberOfFixtuers;
+}
+
+// CHECK: @C.0.1526 = internal unnamed_addr constant
+// CHECK-NOT: @TestCaseImplement = external unnamed_addr constant %struct.TestImplement
+// CHECK: @TestCaseImplement = external constant %struct.TestImplement
+const TestImplement TestCallerImplement = {
+  (TestNameFunction)TestCaller_name,
+  (TestRunFunction)TestCaller_run,
+  (TestCountTestCasesFunction)TestCaller_countTestCases,
+};