1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___CONFIGURATION_AVAILABILITY_H
11#define _LIBCPP___CONFIGURATION_AVAILABILITY_H
12
13#include <__configuration/compiler.h>
14#include <__configuration/language.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20// Libc++ is shipped by various vendors. In particular, it is used as a system
21// library on macOS, iOS and other Apple platforms. In order for users to be
22// able to compile a binary that is intended to be deployed to an older version
23// of a platform, Clang provides availability attributes [1]. These attributes
24// can be placed on declarations and are used to describe the life cycle of a
25// symbol in the library.
26//
27// The main goal is to ensure a compile-time error if a symbol that hasn't been
28// introduced in a previously released library is used in a program that targets
29// that previously released library. Normally, this would be a load-time error
30// when one tries to launch the program against the older library.
31//
32// For example, the filesystem library was introduced in the dylib in LLVM 9.
33// On Apple platforms, this corresponds to macOS 10.15. If a user compiles on
34// a macOS 10.15 host but targets macOS 10.13 with their program, the compiler
35// would normally not complain (because the required declarations are in the
36// headers), but the dynamic loader would fail to find the symbols when actually
37// trying to launch the program on macOS 10.13. To turn this into a compile-time
38// issue instead, declarations are annotated with when they were introduced, and
39// the compiler can produce a diagnostic if the program references something that
40// isn't available on the deployment target.
41//
42// This mechanism is general in nature, and any vendor can add their markup to
43// the library (see below). Whenever a new feature is added that requires support
44// in the shared library, two macros are added below to allow marking the feature
45// as unavailable:
46// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_<feature>` which must be defined
47// to `_LIBCPP_INTRODUCED_IN_<version>` for the appropriate LLVM version.
48// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must be defined to
49// `_LIBCPP_INTRODUCED_IN_<version>_MARKUP` for the appropriate LLVM version.
50//
51// When vendors decide to ship the feature as part of their shared library, they
52// can update the `_LIBCPP_INTRODUCED_IN_<version>` macro (and the markup counterpart)
53// based on the platform version they shipped that version of LLVM in. The library
54// will then use this markup to provide an optimal user experience on these platforms.
55//
56// Furthermore, many features in the standard library have corresponding
57// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_<feature>` macros
58// are checked by the corresponding feature-test macros generated by
59// generate_feature_test_macro_components.py to ensure that the library
60// doesn't announce a feature as being implemented if it is unavailable on
61// the deployment target.
62//
63// Note that this mechanism is disabled by default in the "upstream" libc++.
64// Availability annotations are only meaningful when shipping libc++ inside
65// a platform (i.e. as a system library), and so vendors that want them should
66// turn those annotations on at CMake configuration time.
67//
68// [1]: https://clang.llvm.org/docs/AttributeReference.html#availability
69
70// For backwards compatibility, allow users to define _LIBCPP_DISABLE_AVAILABILITY
71// for a while.
72#if defined(_LIBCPP_DISABLE_AVAILABILITY)
73# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
74# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
75# endif
76#endif
77
78// Availability markup is disabled when building the library, or when a non-Clang
79// compiler is used because only Clang supports the necessary attributes.
80#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCXXABI_BUILDING_LIBRARY) || !defined(_LIBCPP_COMPILER_CLANG_BASED)
81# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
82# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
83# endif
84#endif
85
86// When availability annotations are disabled, we take for granted that features introduced
87// in all versions of the library are available.
88#if defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
89
90# define _LIBCPP_INTRODUCED_IN_LLVM_19 1
91# define _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE /* nothing */
92
93# define _LIBCPP_INTRODUCED_IN_LLVM_18 1
94# define _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE /* nothing */
95
96# define _LIBCPP_INTRODUCED_IN_LLVM_17 1
97# define _LIBCPP_INTRODUCED_IN_LLVM_17_ATTRIBUTE /* nothing */
98
99# define _LIBCPP_INTRODUCED_IN_LLVM_16 1
100# define _LIBCPP_INTRODUCED_IN_LLVM_16_ATTRIBUTE /* nothing */
101
102# define _LIBCPP_INTRODUCED_IN_LLVM_15 1
103# define _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE /* nothing */
104
105# define _LIBCPP_INTRODUCED_IN_LLVM_14 1
106# define _LIBCPP_INTRODUCED_IN_LLVM_14_ATTRIBUTE /* nothing */
107
108# define _LIBCPP_INTRODUCED_IN_LLVM_13 1
109# define _LIBCPP_INTRODUCED_IN_LLVM_13_ATTRIBUTE /* nothing */
110
111# define _LIBCPP_INTRODUCED_IN_LLVM_12 1
112# define _LIBCPP_INTRODUCED_IN_LLVM_12_ATTRIBUTE /* nothing */
113
114# define _LIBCPP_INTRODUCED_IN_LLVM_11 1
115# define _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE /* nothing */
116
117# define _LIBCPP_INTRODUCED_IN_LLVM_10 1
118# define _LIBCPP_INTRODUCED_IN_LLVM_10_ATTRIBUTE /* nothing */
119
120# define _LIBCPP_INTRODUCED_IN_LLVM_9 1
121# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE /* nothing */
122# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_PUSH /* nothing */
123# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_POP /* nothing */
124
125# define _LIBCPP_INTRODUCED_IN_LLVM_8 1
126# define _LIBCPP_INTRODUCED_IN_LLVM_8_ATTRIBUTE /* nothing */
127
128# define _LIBCPP_INTRODUCED_IN_LLVM_4 1
129# define _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE /* nothing */
130
131#elif defined(__APPLE__)
132
133// clang-format off
134
135// LLVM 19
136// TODO: Fill this in
137# define _LIBCPP_INTRODUCED_IN_LLVM_19 0
138# define _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE __attribute__((unavailable))
139
140// LLVM 18
141// TODO: Fill this in
142# define _LIBCPP_INTRODUCED_IN_LLVM_18 0
143# define _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE __attribute__((unavailable))
144
145// LLVM 17
146# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140400) || \
147 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170400) || \
148 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170400) || \
149 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100400)
150# define _LIBCPP_INTRODUCED_IN_LLVM_17 0
151# else
152# define _LIBCPP_INTRODUCED_IN_LLVM_17 1
153# endif
154# define _LIBCPP_INTRODUCED_IN_LLVM_17_ATTRIBUTE \
155 __attribute__((availability(macos, strict, introduced = 14.4))) \
156 __attribute__((availability(ios, strict, introduced = 17.4))) \
157 __attribute__((availability(tvos, strict, introduced = 17.4))) \
158 __attribute__((availability(watchos, strict, introduced = 10.4)))
159
160// LLVM 16
161# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140000) || \
162 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170000) || \
163 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170000) || \
164 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100000)
165# define _LIBCPP_INTRODUCED_IN_LLVM_16 0
166# else
167# define _LIBCPP_INTRODUCED_IN_LLVM_16 1
168# endif
169# define _LIBCPP_INTRODUCED_IN_LLVM_16_ATTRIBUTE \
170 __attribute__((availability(macos, strict, introduced = 14.0))) \
171 __attribute__((availability(ios, strict, introduced = 17.0))) \
172 __attribute__((availability(tvos, strict, introduced = 17.0))) \
173 __attribute__((availability(watchos, strict, introduced = 10.0)))
174
175// LLVM 15
176# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130400) || \
177 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160500) || \
178 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160500) || \
179 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90500)
180# define _LIBCPP_INTRODUCED_IN_LLVM_15 0
181# else
182# define _LIBCPP_INTRODUCED_IN_LLVM_15 1
183# endif
184# define _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE \
185 __attribute__((availability(macos, strict, introduced = 13.4))) \
186 __attribute__((availability(ios, strict, introduced = 16.5))) \
187 __attribute__((availability(tvos, strict, introduced = 16.5))) \
188 __attribute__((availability(watchos, strict, introduced = 9.5)))
189
190// LLVM 14
191# define _LIBCPP_INTRODUCED_IN_LLVM_14 _LIBCPP_INTRODUCED_IN_LLVM_15
192# define _LIBCPP_INTRODUCED_IN_LLVM_14_ATTRIBUTE _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE
193
194// LLVM 13
195# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130000) || \
196 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160000) || \
197 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160000) || \
198 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90000)
199# define _LIBCPP_INTRODUCED_IN_LLVM_13 0
200# else
201# define _LIBCPP_INTRODUCED_IN_LLVM_13 1
202# endif
203# define _LIBCPP_INTRODUCED_IN_LLVM_13_ATTRIBUTE \
204 __attribute__((availability(macos, strict, introduced = 13.0))) \
205 __attribute__((availability(ios, strict, introduced = 16.0))) \
206 __attribute__((availability(tvos, strict, introduced = 16.0))) \
207 __attribute__((availability(watchos, strict, introduced = 9.0)))
208
209// LLVM 12
210# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 120300) || \
211 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 150300) || \
212 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 150300) || \
213 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 80300)
214# define _LIBCPP_INTRODUCED_IN_LLVM_12 0
215# else
216# define _LIBCPP_INTRODUCED_IN_LLVM_12 1
217# endif
218# define _LIBCPP_INTRODUCED_IN_LLVM_12_ATTRIBUTE \
219 __attribute__((availability(macos, strict, introduced = 12.3))) \
220 __attribute__((availability(ios, strict, introduced = 15.3))) \
221 __attribute__((availability(tvos, strict, introduced = 15.3))) \
222 __attribute__((availability(watchos, strict, introduced = 8.3)))
223
224// LLVM 11
225# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) || \
226 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
227 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) || \
228 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
229# define _LIBCPP_INTRODUCED_IN_LLVM_11 0
230# else
231# define _LIBCPP_INTRODUCED_IN_LLVM_11 1
232# endif
233# define _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE \
234 __attribute__((availability(macos, strict, introduced = 11.0))) \
235 __attribute__((availability(ios, strict, introduced = 14.0))) \
236 __attribute__((availability(tvos, strict, introduced = 14.0))) \
237 __attribute__((availability(watchos, strict, introduced = 7.0)))
238
239// LLVM 10
240# define _LIBCPP_INTRODUCED_IN_LLVM_10 _LIBCPP_INTRODUCED_IN_LLVM_11
241# define _LIBCPP_INTRODUCED_IN_LLVM_10_ATTRIBUTE _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE
242
243// LLVM 9
244# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) || \
245 (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000) || \
246 (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) || \
247 (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
248# define _LIBCPP_INTRODUCED_IN_LLVM_9 0
249# else
250# define _LIBCPP_INTRODUCED_IN_LLVM_9 1
251# endif
252# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE \
253 __attribute__((availability(macos, strict, introduced = 10.15))) \
254 __attribute__((availability(ios, strict, introduced = 13.0))) \
255 __attribute__((availability(tvos, strict, introduced = 13.0))) \
256 __attribute__((availability(watchos, strict, introduced = 6.0)))
257# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_PUSH \
258 _Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \
259 _Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \
260 _Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \
261 _Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")
262# define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_POP \
263 _Pragma("clang attribute pop") \
264 _Pragma("clang attribute pop") \
265 _Pragma("clang attribute pop") \
266 _Pragma("clang attribute pop")
267
268// LLVM 4
269# if defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000
270# define _LIBCPP_INTRODUCED_IN_LLVM_4 0
271# else
272# define _LIBCPP_INTRODUCED_IN_LLVM_4 1
273# endif
274# define _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE __attribute__((availability(watchos, strict, introduced = 5.0)))
275
276// clang-format on
277
278#else
279
280// ...New vendors can add availability markup here...
281
282# error \
283 "It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!"
284
285#endif
286
287// These macros control the availability of std::bad_optional_access and
288// other exception types. These were put in the shared library to prevent
289// code bloat from every user program defining the vtable for these exception
290// types.
291//
292// Note that when exceptions are disabled, the methods that normally throw
293// these exceptions can be used even on older deployment targets, but those
294// methods will abort instead of throwing.
295#define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4
296#define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE
297
298#define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4
299#define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE
300
301#define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST _LIBCPP_INTRODUCED_IN_LLVM_4
302#define _LIBCPP_AVAILABILITY_BAD_ANY_CAST _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE
303
304// These macros control the availability of all parts of <filesystem> that
305// depend on something in the dylib.
306#define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY _LIBCPP_INTRODUCED_IN_LLVM_9
307#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE
308#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_PUSH
309#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_POP
310
311// This controls the availability of the C++20 synchronization library,
312// which requires shared library support for various operations
313// (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
314// <semaphore>, and notification functions on std::atomic.
315#define _LIBCPP_AVAILABILITY_HAS_SYNC _LIBCPP_INTRODUCED_IN_LLVM_11
316#define _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE
317
318// Enable additional explicit instantiations of iostreams components. This
319// reduces the number of weak definitions generated in programs that use
320// iostreams by providing a single strong definition in the shared library.
321//
322// TODO: Enable additional explicit instantiations on GCC once it supports exclude_from_explicit_instantiation,
323// or once libc++ doesn't use the attribute anymore.
324// TODO: Enable them on Windows once https://llvm.org/PR41018 has been fixed.
325#if !defined(_LIBCPP_COMPILER_GCC) && !defined(_WIN32)
326# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 _LIBCPP_INTRODUCED_IN_LLVM_12
327#else
328# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
329#endif
330
331// This controls the availability of floating-point std::to_chars functions.
332// These overloads were added later than the integer overloads.
333#define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT _LIBCPP_INTRODUCED_IN_LLVM_14
334#define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_INTRODUCED_IN_LLVM_14_ATTRIBUTE
335
336// This controls whether the library claims to provide a default verbose
337// termination function, and consequently whether the headers will try
338// to use it when the mechanism isn't overriden at compile-time.
339#define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT _LIBCPP_INTRODUCED_IN_LLVM_15
340#define _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE
341
342// This controls the availability of the C++17 std::pmr library,
343// which is implemented in large part in the built library.
344//
345// TODO: Enable std::pmr markup once https://github.com/llvm/llvm-project/issues/40340 has been fixed
346// Until then, it is possible for folks to try to use `std::pmr` when back-deploying to targets that don't support
347// it and it'll be a load-time error, but we don't have a good alternative because the library won't compile if we
348// use availability annotations until that bug has been fixed.
349#define _LIBCPP_AVAILABILITY_HAS_PMR _LIBCPP_INTRODUCED_IN_LLVM_16
350#define _LIBCPP_AVAILABILITY_PMR
351
352// These macros controls the availability of __cxa_init_primary_exception
353// in the built library, which std::make_exception_ptr might use
354// (see libcxx/include/__exception/exception_ptr.h).
355#define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION _LIBCPP_INTRODUCED_IN_LLVM_18
356#define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE
357
358// This controls the availability of C++23 <print>, which
359// has a dependency on the built library (it needs access to
360// the underlying buffer types of std::cout, std::cerr, and std::clog.
361#define _LIBCPP_AVAILABILITY_HAS_PRINT _LIBCPP_INTRODUCED_IN_LLVM_18
362#define _LIBCPP_AVAILABILITY_PRINT _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE
363
364// This controls the availability of the C++20 time zone database.
365// The parser code is built in the library.
366#define _LIBCPP_AVAILABILITY_HAS_TZDB _LIBCPP_INTRODUCED_IN_LLVM_19
367#define _LIBCPP_AVAILABILITY_TZDB _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE
368
369// These macros determine whether we assume that std::bad_function_call and
370// std::bad_expected_access provide a key function in the dylib. This allows
371// centralizing their vtable and typeinfo instead of having all TUs provide
372// a weak definition that then gets deduplicated.
373#define _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19
374#define _LIBCPP_AVAILABILITY_BAD_FUNCTION_CALL_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE
375#define _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19
376#define _LIBCPP_AVAILABILITY_BAD_EXPECTED_ACCESS_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE
377
378// Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.
379// Those are defined in terms of the availability attributes above, and
380// should not be vendor-specific.
381#if defined(_LIBCPP_HAS_NO_EXCEPTIONS)
382# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
383# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
384# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
385#else
386# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_ANY_CAST
387# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
388# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
389#endif
390
391// Define availability attributes that depend on both
392// _LIBCPP_HAS_NO_EXCEPTIONS and _LIBCPP_HAS_NO_RTTI.
393#if defined(_LIBCPP_HAS_NO_EXCEPTIONS) || defined(_LIBCPP_HAS_NO_RTTI)
394# undef _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION
395# undef _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
396# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 0
397# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
398#endif
399
400#endif // _LIBCPP___CONFIGURATION_AVAILABILITY_H
401