Define C++17 feature-test macros

	* include/bits/allocator.h (__cpp_lib_incomplete_container_elements):
	Define feature-test macro.
	* include/bits/range_access.h (__cpp_lib_array_constexpr): Likewise.
	* include/std/shared_mutex (__cpp_lib_shared_mutex): Uncomment.
	* include/std/type_traits (__cpp_lib_logical_traits): Fix value.
	(__cpp_lib_type_trait_variable_templates): Define.

From-SVN: r239088

libstdc++-v3/ChangeLog

 2016-08-03  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/allocator.h (__cpp_lib_incomplete_container_elements):
+	Define feature-test macro.
+	* include/bits/range_access.h (__cpp_lib_array_constexpr): Likewise.
+	* include/std/shared_mutex (__cpp_lib_shared_mutex): Uncomment.
+	* include/std/type_traits (__cpp_lib_logical_traits): Fix value.
+	(__cpp_lib_type_trait_variable_templates): Define.
+
 	* include/bits/stl_function.h: Remove commented-out macro.
 	* include/bits/stl_tree.h (__cpp_lib_generic_associative_lookup):
 	Define feature-test macro.

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

@@ -49,6 +49,8 @@
 #include <type_traits>
 #endif
 
+#define __cpp_lib_incomplete_container_elements 201505
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION

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

@@ -38,6 +38,10 @@ namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
+#if __cplusplus >= 201402L
+# define __cpp_lib_array_constexpr 201603L
+#endif
+
   /**
    *  @brief  Return an iterator pointing to the first element of
    *          the container.

libstdc++-v3/include/std/shared_mutex

@@ -52,7 +52,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #ifdef _GLIBCXX_HAS_GTHREADS
 
 #if __cplusplus > 201402L
-// TODO: #define __cpp_lib_shared_mutex 201505
+#define __cpp_lib_shared_mutex 201505
   class shared_mutex;
 #endif
 

libstdc++-v3/include/std/type_traits

@@ -156,7 +156,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #if __cplusplus > 201402L
 
-#define __cpp_lib_logical_traits 201511
+#define __cpp_lib_logical_traits 201510
 
   template<typename... _Bn>
     struct conjunction
@@ -2763,6 +2763,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif // __cplusplus >= 201402L
 
 #if __cplusplus > 201402L
+# define __cpp_lib_type_trait_variable_templates 201510L
 template <typename _Tp>
   constexpr bool is_void_v = is_void<_Tp>::value;
 template <typename _Tp>