[committed] libstdc++: Fix feature test macros in <version> for freestanding

[committed] libstdc++: Fix feature test macros in <version> for freestanding

[Jonathan Wakely]

Tested powerpc64le-linux, pushed to trunk.

Backport to gcc-11 needed too.

-- >8 --

Some C++17 and C++20 feature test macros are only defined in <version>
for hosted builds, even though the features are supported for
freestanding.

All C++23 feature test macros are defined in <version> for freestanding,
but most of the features are only supported for hosted.

libstdc++-v3/ChangeLog:

	* include/std/version [!_GLIBCXX_HOSTED]
	(__cpp_lib_hardware_interference_size): Define for freestanding.
	(__cpp_lib_bit_cast): Likewise.
	(__cpp_lib_is_layout_compatible): Likewise.
	(__cpp_lib_is_pointer_interconvertible): Likewise.
	(__cpp_lib_adaptor_iterator_pair_constructor): Do not define for
	freestanding.
	(__cpp_lib_invoke_r): Likewise.
	(__cpp_lib_ios_noreplace): Likewise.
	(__cpp_lib_monadic_optional): Likewise.
	(__cpp_lib_move_only_function): Likewise.
	(__cpp_lib_spanstream): Likewise.
	(__cpp_lib_stacktrace): Likewise.
	(__cpp_lib_string_contains): Likewise.
	(__cpp_lib_string_resize_and_overwrite): Likewise.
	(__cpp_lib_to_underlying): Likewise.
---
 libstdc++-v3/include/std/version | 35 +++++++++++++++++---------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index d730a7ea3c7..535f095108a 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -108,6 +108,9 @@
 #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
 # define __cpp_lib_has_unique_object_representations 201606L
 #endif
+#ifdef __GCC_DESTRUCTIVE_SIZE
+# define __cpp_lib_hardware_interference_size 201703L
+#endif
 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
 # define __cpp_lib_is_aggregate 201703L
 #endif
@@ -142,9 +145,6 @@
 #define __cpp_lib_filesystem 201703L
 #define __cpp_lib_gcd 201606L
 #define __cpp_lib_gcd_lcm 201606L
-#ifdef __GCC_DESTRUCTIVE_SIZE
-# define __cpp_lib_hardware_interference_size 201703L
-#endif
 #define __cpp_lib_hypot 201603L
 #define __cpp_lib_invoke 201411L
 #define __cpp_lib_lcm 201606L
@@ -188,6 +188,9 @@
 #define __cpp_lib_atomic_float 201711L
 #define __cpp_lib_atomic_ref 201806L
 #define __cpp_lib_atomic_value_initialization 201911L
+#if __has_builtin(__builtin_bit_cast)
+# define __cpp_lib_bit_cast 201806L
+#endif
 #define __cpp_lib_bitops 201907L
 #define __cpp_lib_bounded_array_traits 201902L
 // __cpp_lib_char8_t is defined in <bits/c++config.h>
@@ -202,7 +205,15 @@
 #ifdef _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED
 # define __cpp_lib_is_constant_evaluated 201811L
 #endif
+#if __has_builtin(__is_layout_compatible) \
+  && __has_builtin(__builtin_is_corresponding_member)
+# define __cpp_lib_is_layout_compatible 201907L
+#endif
 #define __cpp_lib_is_nothrow_convertible 201806L
+#if __has_builtin(__is_pointer_interconvertible_base_of) \
+ && __has_builtin(__builtin_is_pointer_interconvertible_with_class)
+# define __cpp_lib_is_pointer_interconvertible 201907L
+#endif
 #define __cpp_lib_remove_cvref 201711L
 #if __has_builtin(__builtin_source_location)
 # define __cpp_lib_source_location 201907L
@@ -224,9 +235,6 @@
 # endif
 #endif
 #define __cpp_lib_bind_front 201907L
-#if __has_builtin(__builtin_bit_cast)
-# define __cpp_lib_bit_cast 201806L
-#endif
 // FIXME: #define __cpp_lib_execution 201902L
 #define __cpp_lib_integer_comparison_functions 202002L
 #define __cpp_lib_constexpr_algorithms 201806L
@@ -255,14 +263,6 @@
 #ifdef _GLIBCXX_HAS_GTHREADS
 # define __cpp_lib_jthread 201911L
 #endif
-#if __has_builtin(__is_layout_compatible) \
-  && __has_builtin(__builtin_is_corresponding_member)
-# define __cpp_lib_is_layout_compatible 201907L
-#endif
-#if __has_builtin(__is_pointer_interconvertible_base_of) \
- && __has_builtin(__builtin_is_pointer_interconvertible_with_class)
-# define __cpp_lib_is_pointer_interconvertible 201907L
-#endif
 #if __cpp_lib_atomic_wait
 # define __cpp_lib_latch 201907L
 #endif
@@ -300,12 +300,14 @@
 
 #if __cplusplus > 202002L
 // c++2b
-#define __cpp_lib_adaptor_iterator_pair_constructor 202106L
 #define __cpp_lib_byteswap 202110L
 #define __cpp_lib_constexpr_typeinfo 202106L
+#define __cpp_lib_is_scoped_enum 202011L
+
+#if _GLIBCXX_HOSTED
+#define __cpp_lib_adaptor_iterator_pair_constructor 202106L
 #define __cpp_lib_invoke_r 202106L
 #define __cpp_lib_ios_noreplace 202200L
-#define __cpp_lib_is_scoped_enum 202011L
 #if __cpp_lib_concepts
 # define __cpp_lib_monadic_optional 202110L
 #endif
@@ -321,6 +323,7 @@
 # define __cpp_lib_string_resize_and_overwrite 202110L
 #endif
 #define __cpp_lib_to_underlying 202102L
+#endif
 #endif // C++2b
 #endif // C++20
 #endif // C++17
-- 
2.34.1