3.cc: Only use a thread_local when __cxa_thread_atexit_impl is available.

	* testsuite/30_threads/condition_variable/members/3.cc: Only use
	a thread_local when __cxa_thread_atexit_impl is available.

From-SVN: r218638

libstdc++-v3/ChangeLog

+2014-12-11  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/30_threads/condition_variable/members/3.cc: Only use
+	a thread_local when __cxa_thread_atexit_impl is available.
+
 2014-12-10  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/locale_facets.tcc (numpunct::_M_cache): Avoid calling

libstdc++-v3/testsuite/30_threads/condition_variable/members/3.cc

@@ -41,7 +41,12 @@ void func()
 {
   std::unique_lock<std::mutex> lock{mx};
   std::notify_all_at_thread_exit(cv, std::move(lock));
+#if _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
+  // Correct order of thread_local destruction needs __cxa_thread_atexit_impl
   static thread_local Inc inc;
+#else
+  Inc inc;
+#endif
 }
 
 int main()