Call __cxa_thread_finalize for the main thread.

Bug: http://b/20231984
Bug: http://b/16696563
Change-Id: I71cfddd0d404d1d4a593ec8d3bca9741de8cb90f
diff --git a/tests/__cxa_thread_atexit_test.cpp b/tests/__cxa_thread_atexit_test.cpp
index fea60b7..59d2efd 100644
--- a/tests/__cxa_thread_atexit_test.cpp
+++ b/tests/__cxa_thread_atexit_test.cpp
@@ -50,6 +50,29 @@
   ASSERT_EQ("dtor called.", class_with_dtor_output);
 }
 
+class ClassWithDtorForMainThread {
+ public:
+  void set_message(const std::string& msg) {
+    message = msg;
+  }
+
+  ~ClassWithDtorForMainThread() {
+    fprintf(stderr, "%s", message.c_str());
+  }
+ private:
+  std::string message;
+};
+
+static void thread_atexit_main() {
+  static thread_local ClassWithDtorForMainThread class_with_dtor_for_main_thread;
+  class_with_dtor_for_main_thread.set_message("d-tor for main thread called.");
+  exit(0);
+}
+
+TEST(thread_local, dtor_for_main_thread) {
+  ASSERT_EXIT(thread_atexit_main(), testing::ExitedWithCode(0), "d-tor for main thread called.");
+}
+
 extern "C" int __cxa_thread_atexit_impl(void (*fn)(void*), void* arg, void* dso_handle);
 
 static void thread_atexit_fn1(void* arg) {