Define testsuite macro for correct thread_local destructors

	* testsuite/30_threads/condition_variable/members/3.cc: Use new macro
	to detect correct thread_local destructors.
	* testsuite/util/testsuite_hooks.h (CORRECT_THREAD_LOCAL_DTORS):
	Define.

From-SVN: r244226

libstdc++-v3/ChangeLog

 2017-01-09  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/30_threads/condition_variable/members/3.cc: Use new macro
+	to detect correct thread_local destructors.
+	* testsuite/util/testsuite_hooks.h (CORRECT_THREAD_LOCAL_DTORS):
+	Define.
+
+2017-01-09  Jonathan Wakely  <jwakely@redhat.com>
 	    Aditya Kumar  <hiraditya@msn.com>
 
 	PR libstdc++/66414

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

@@ -24,6 +24,7 @@
 #include <condition_variable>
 #include <thread>
 #include <mutex>
+#include <testsuite_hooks.h>
 
 std::mutex mx;
 std::condition_variable cv;
@@ -40,12 +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
+#if CORRECT_THREAD_LOCAL_DTORS
   // Correct order of thread_local destruction needs __cxa_thread_atexit_impl
-  static thread_local Inc inc;
-#else
-  Inc inc;
+  // or similar support from libc.
+  static thread_local
 #endif
+  Inc inc;
 }
 
 int main()

libstdc++-v3/testsuite/util/testsuite_hooks.h

@@ -81,6 +81,12 @@
 # define THROW(X) noexcept(false)
 #endif
 
+#if _GLIBCXX_HAVE___CXA_THREAD_ATEXIT || _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
+// Correct order of thread_local destruction needs __cxa_thread_atexit_impl
+// or similar support from libc.
+# define CORRECT_THREAD_LOCAL_DTORS 1
+#endif
+
 namespace __gnu_test
 {
   // All macros are defined in GLIBCXX_CONFIGURE_TESTSUITE and imported