Define std::allocator<T>::is_always_equal

	* include/bits/allocator.h (allocator<T>::is_always_equal): Define.
	* testsuite/20_util/allocator/requirements/typedefs.cc: Test for
	is_always_equal.
	* testsuite/util/testsuite_allocator.h
	(uneq_allocator::is_always_equal): Define as false_type.

From-SVN: r240920

libstdc++-v3/ChangeLog

 2016-10-10  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/allocator.h (allocator<T>::is_always_equal): Define.
+	* testsuite/20_util/allocator/requirements/typedefs.cc: Test for
+	is_always_equal.
+	* testsuite/util/testsuite_allocator.h
+	(uneq_allocator::is_always_equal): Define as false_type.
+
 	* include/experimental/numeric (gcd, lcm): Make bool arguments
 	ill-formed.
 	* include/std/numeric (gcd, lcm): Likewise.

libstdc++-v3/include/bits/allocator.h

@@ -50,6 +50,9 @@
 #endif
 
 #define __cpp_lib_incomplete_container_elements 201505
+#if __cplusplus >= 201103L
+# define __cpp_lib_allocator_is_always_equal 201411
+#endif
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
@@ -80,7 +83,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       // 2103. std::allocator propagate_on_container_move_assignment
       typedef true_type propagate_on_container_move_assignment;
 
-#define __cpp_lib_allocator_is_always_equal 201411
       typedef true_type is_always_equal;
 #endif
     };
@@ -113,6 +115,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
       // 2103. std::allocator propagate_on_container_move_assignment
       typedef true_type propagate_on_container_move_assignment;
+
+      typedef true_type is_always_equal;
 #endif
 
       allocator() throw() { }

libstdc++-v3/testsuite/20_util/allocator/requirements/typedefs.cc

@@ -48,3 +48,6 @@ static_assert( is_same<allocator<int>::rebind<char>::other,
 static_assert( is_same<allocator<int>::propagate_on_container_move_assignment,
                        std::true_type>::value,
                "propagate_on_container_move_assignment" );
+
+static_assert( is_same<allocator<int>::is_always_equal, std::true_type>::value,
+               "is_always_equal" );

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

@@ -297,6 +297,7 @@ namespace __gnu_test
 
 #if __cplusplus >= 201103L
       typedef std::true_type			propagate_on_container_swap;
+      typedef std::false_type			is_always_equal;
 #endif
 
       template<typename Tp1>