libstdc++: Add missing feature test macros

These macros all correspond to features that are already supported, but
the macro was not defined when the feature was implemented.

	* include/bits/ptr_traits.h (__cpp_lib_constexpr_memory): Define to
	indicate P1006R1 support.
	(__cpp_lib_to_address): Define to indicate P0653R2 support.
	* include/bits/range_access.h (__cpp_lib_ssize): Define to indicate
	P1227R2 support.
	* include/bits/ranges_algo.h (__cpp_lib_shift): Define to indicate
	P0769R2 support.
	* include/std/atomic (__cpp_lib_atomic_float): Define to indicate
	P0020R6 support.
	* include/std/memory (__cpp_lib_assume_aligned): Define to indicate
	P1007R3 support.
	* include/std/memory_resource (__cpp_lib_polymorphic_allocator):
	Define to indicate P0339R6 support.
	* include/std/string_view (__cpp_lib_starts_ends_with): Define to
	indicate P0457R2 support.
	* include/std/type_traits (__cpp_lib_is_nothrow_convertible): Define
	to indicate P0758R1 support.
	(__cpp_lib_remove_cvref): Define to indicate P0550R2 support.
	(__cpp_lib_type_identity): Define to indicate P0887R1 support.
	* include/std/version (__cpp_lib_atomic_float)
	(__cpp_lib_is_nothrow_convertible, __cpp_lib_remove_cvref)
	(__cpp_lib_type_identity, __cpp_lib_assume_aligned)
	(__cpp_lib_constexpr_memory, __cpp_lib_polymorphic_allocator)
	(__cpp_lib_shift, __cpp_lib_ssize, __cpp_lib_starts_ends_with)
	(__cpp_lib_to_address): Define.
	* testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line number.

libstdc++-v3/ChangeLog

@@ -1,5 +1,32 @@
 2020-04-22  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/ptr_traits.h (__cpp_lib_constexpr_memory): Define to
+	indicate P1006R1 support.
+	(__cpp_lib_to_address): Define to indicate P0653R2 support.
+	* include/bits/range_access.h (__cpp_lib_ssize): Define to indicate
+	P1227R2 support.
+	* include/bits/ranges_algo.h (__cpp_lib_shift): Define to indicate
+	P0769R2 support.
+	* include/std/atomic (__cpp_lib_atomic_float): Define to indicate
+	P0020R6 support.
+	* include/std/memory (__cpp_lib_assume_aligned): Define to indicate
+	P1007R3 support.
+	* include/std/memory_resource (__cpp_lib_polymorphic_allocator):
+	Define to indicate P0339R6 support.
+	* include/std/string_view (__cpp_lib_starts_ends_with): Define to
+	indicate P0457R2 support.
+	* include/std/type_traits (__cpp_lib_is_nothrow_convertible): Define
+	to indicate P0758R1 support.
+	(__cpp_lib_remove_cvref): Define to indicate P0550R2 support.
+	(__cpp_lib_type_identity): Define to indicate P0887R1 support.
+	* include/std/version (__cpp_lib_atomic_float)
+	(__cpp_lib_is_nothrow_convertible, __cpp_lib_remove_cvref)
+	(__cpp_lib_type_identity, __cpp_lib_assume_aligned)
+	(__cpp_lib_constexpr_memory, __cpp_lib_polymorphic_allocator)
+	(__cpp_lib_shift, __cpp_lib_ssize, __cpp_lib_starts_ends_with)
+	(__cpp_lib_to_address): Define.
+	* testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line number.
+
 	* include/bits/stl_map.h (__cpp_lib_map_insertion): Remove old
 	macro.
 	* include/bits/unordered_map.h (__cpp_lib_unordered_map_insertion):

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

@@ -35,6 +35,7 @@
 #include <bits/move.h>
 
 #if __cplusplus > 201703L
+#define __cpp_lib_constexpr_memory 201811L
 namespace __gnu_debug { struct _Safe_iterator_base; }
 #endif
 
@@ -180,6 +181,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	return std::__to_address(__ptr.operator->());
     }
 
+#define __cpp_lib_to_address 201711L
+
   /**
    * @brief Obtain address referenced by a pointer to an object
    * @param __ptr A pointer to an object

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

@@ -322,6 +322,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif // C++17
 
 #if __cplusplus > 201703L
+#define __cpp_lib_ssize 201902L
   template<typename _Container>
     constexpr auto
     ssize(const _Container& __cont)

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

@@ -3691,6 +3691,7 @@ namespace ranges
 
 } // namespace ranges
 
+#define __cpp_lib_shift 201806L
   template<class ForwardIterator>
     constexpr ForwardIterator
     shift_left(ForwardIterator __first, ForwardIterator __last,

libstdc++-v3/include/std/atomic

@@ -1477,6 +1477,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); }
 
 #if __cplusplus > 201703L
+#define __cpp_lib_atomic_float 201711L
   template<>
     struct atomic<float> : __atomic_float<float>
     {

libstdc++-v3/include/std/memory

@@ -180,6 +180,7 @@ get_pointer_safety() noexcept { return pointer_safety::relaxed; }
 // @}
 
 #if __cplusplus > 201703L
+#define __cpp_lib_assume_aligned 201811L
   /** @brief Inform the compiler that a pointer is aligned.
    *
    *  @tparam _Align An alignment value (i.e. a power of two)

libstdc++-v3/include/std/memory_resource

@@ -61,6 +61,7 @@ namespace pmr
   template<typename _Tp>
     class polymorphic_allocator;
 #else // C++20
+# define __cpp_lib_polymorphic_allocator 201902L
   template<typename _Tp = std::byte>
     class polymorphic_allocator;
 #endif

libstdc++-v3/include/std/string_view

@@ -322,6 +322,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 
 #if __cplusplus > 201703L
+#define __cpp_lib_starts_ends_with 201711L
       constexpr bool
       starts_with(basic_string_view __x) const noexcept
       { return this->substr(0, __x.size()) == __x; }

libstdc++-v3/include/std/type_traits

@@ -1489,6 +1489,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
 #if __cplusplus > 201703L
+#define __cpp_lib_is_nothrow_convertible 201806L
   /// is_nothrow_convertible
   template<typename _From, typename _To>
     struct is_nothrow_convertible
@@ -3221,6 +3222,8 @@ template <typename _From, typename _To>
 #endif // C++17
 
 #if __cplusplus > 201703L
+#define __cpp_lib_remove_cvref 201711L
+
   /// Remove references and cv-qualifiers.
   template<typename _Tp>
     struct remove_cvref
@@ -3231,6 +3234,7 @@ template <typename _From, typename _To>
   template<typename _Tp>
     using remove_cvref_t = __remove_cvref_t<_Tp>;
 
+#define __cpp_lib_type_identity 201806L
   /// Identity metafunction.
   template<typename _Tp>
     struct type_identity { using type = _Tp; };

libstdc++-v3/include/std/version

@@ -161,10 +161,12 @@
 
 #if __cplusplus > 201703L
 // c++2a
+#define __cpp_lib_atomic_float 201711L
 #define __cpp_lib_atomic_ref 201806L
 #define __cpp_lib_atomic_value_initialization 201911L
 #define __cpp_lib_bitops 201907L
 #define __cpp_lib_bounded_array_traits 201902L
+// __cpp_lib_char8_t is defined in <bits/c++config.h>
 #if __cpp_concepts >= 201907L
 # define __cpp_lib_concepts 201806L
 #endif
@@ -176,15 +178,20 @@
 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
 # define __cpp_lib_is_constant_evaluated 201811L
 #endif
+#define __cpp_lib_is_nothrow_convertible 201806L
+#define __cpp_lib_remove_cvref 201711L
+#define __cpp_lib_type_identity 201806L
 #define __cpp_lib_unwrap_ref 201811L
 
 #if _GLIBCXX_HOSTED
+#define __cpp_lib_assume_aligned 201811L
 #define __cpp_lib_bind_front 201907L
 #define __cpp_lib_integer_comparison_functions 202002L
 #define __cpp_lib_constexpr_algorithms 201806L
 #define __cpp_lib_constexpr_complex 201711L
 #define __cpp_lib_constexpr_dynamic_alloc 201907L
 #define __cpp_lib_constexpr_invoke 201907L
+#define __cpp_lib_constexpr_memory 201811L
 #define __cpp_lib_constexpr_numeric 201911L
 #define __cpp_lib_erase_if 202002L
 #define __cpp_lib_interpolate 201902L
@@ -193,13 +200,18 @@
 #endif
 #define __cpp_lib_list_remove_return_type 201806L
 #define __cpp_lib_math_constants 201907L
+#define __cpp_lib_polymorphic_allocator 201902L
 #if __cpp_lib_concepts
 # define __cpp_lib_ranges 201911L
 #endif
+#define __cpp_lib_shift 201806L
 #define __cpp_lib_span 202002L
+#define __cpp_lib_ssize 201902L
+#define __cpp_lib_starts_ends_with 201711L
 #if __cpp_impl_three_way_comparison >= 201907L && __cpp_lib_concepts
 # define __cpp_lib_three_way_comparison 201907L
 #endif
+#define __cpp_lib_to_address 201711L
 #define __cpp_lib_to_array 201907L
 #endif
 #endif // C++2a

libstdc++-v3/testsuite/20_util/to_address/1_neg.cc

@@ -17,7 +17,7 @@
 
 // { dg-options "-std=gnu++2a" }
 // { dg-do compile { target c++2a } }
-// { dg-error "not a function pointer" "" { target *-*-* } 157 }
+// { dg-error "not a function pointer" "" { target *-*-* } 158 }
 
 #include <memory>