Protect futures test under libcpp-no-exceptions

[rogfer01]

Summary

Skip tests that expect an exception be thrown.

[mclow.lists]

LGTM.

libcxx/trunk/test/std/thread/futures/futures.promise/move_assign.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
-// XFAIL: libcpp-no-exceptions
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03
 
 // <future>
 
 // class promise<R>
 
 // promise& operator=(promise&& rhs);
 
 #include <future>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_allocator.h"
 
 int main()
 {
     assert(test_alloc_base::alloc_count == 0);
     {
         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
         std::promise<int> p(std::allocator_arg, test_allocator<int>());
         assert(test_alloc_base::alloc_count == 2);
         p = std::move(p0);
         assert(test_alloc_base::alloc_count == 1);
         std::future<int> f = p.get_future();
         assert(test_alloc_base::alloc_count == 1);
         assert(f.valid());
+#ifndef TEST_HAS_NO_EXCEPTIONS
         try
         {
             f = p0.get_future();
             assert(false);
         }
         catch (const std::future_error& e)
         {
             assert(e.code() == make_error_code(std::future_errc::no_state));
         }
+#endif
         assert(test_alloc_base::alloc_count == 1);
     }
     assert(test_alloc_base::alloc_count == 0);
     {
         std::promise<int&> p0(std::allocator_arg, test_allocator<int>());
         std::promise<int&> p(std::allocator_arg, test_allocator<int>());
         assert(test_alloc_base::alloc_count == 2);
         p = std::move(p0);
         assert(test_alloc_base::alloc_count == 1);
         std::future<int&> f = p.get_future();
         assert(test_alloc_base::alloc_count == 1);
         assert(f.valid());
+#ifndef TEST_HAS_NO_EXCEPTIONS
         try
         {
             f = p0.get_future();
             assert(false);
         }
         catch (const std::future_error& e)
         {
             assert(e.code() == make_error_code(std::future_errc::no_state));
         }
+#endif
         assert(test_alloc_base::alloc_count == 1);
     }
     assert(test_alloc_base::alloc_count == 0);
     {
         std::promise<void> p0(std::allocator_arg, test_allocator<void>());
         std::promise<void> p(std::allocator_arg, test_allocator<void>());
         assert(test_alloc_base::alloc_count == 2);
         p = std::move(p0);
         assert(test_alloc_base::alloc_count == 1);
         std::future<void> f = p.get_future();
         assert(test_alloc_base::alloc_count == 1);
         assert(f.valid());
+#ifndef TEST_HAS_NO_EXCEPTIONS
         try
         {
             f = p0.get_future();
             assert(false);
         }
         catch (const std::future_error& e)
         {
             assert(e.code() == make_error_code(std::future_errc::no_state));
         }
+#endif
         assert(test_alloc_base::alloc_count == 1);
     }
     assert(test_alloc_base::alloc_count == 0);
 }