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[libc++] Reformulate availability in terms of LLVM releases (#87563)

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To make it easier to maintain the availability macros for both upstream
developers and vendors, this patch reformulates availability macros as a
function of the upstream LLVM release that a feature was introduced in.
This way, upstream developers can easily use the appropriate LLVM
version, and vendors can simply fill in the platform version(s) in which
a LLVM version landed.
This commit is contained in:
Louis Dionne
2024-04-25 09:27:02 -04:00
committed by GitHub
parent 584a9bfa0e
commit 182f5e9b2f
1 changed files with 239 additions and 202 deletions
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441
libcxx/include/__availability
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@@ -28,30 +28,32 @@
// that previously released library. Normally, this would be a load-time error
// when one tries to launch the program against the older library.
//
// For example, the filesystem library was introduced in the dylib in macOS 10.15.
// If a user compiles on a macOS 10.15 host but targets macOS 10.13 with their
// program, the compiler would normally not complain (because the required
// declarations are in the headers), but the dynamic loader would fail to find
// the symbols when actually trying to launch the program on macOS 10.13. To
// turn this into a compile-time issue instead, declarations are annotated with
// when they were introduced, and the compiler can produce a diagnostic if the
// program references something that isn't available on the deployment target.
// For example, the filesystem library was introduced in the dylib in LLVM 9.
// On Apple platforms, this corresponds to macOS 10.15. If a user compiles on
// a macOS 10.15 host but targets macOS 10.13 with their program, the compiler
// would normally not complain (because the required declarations are in the
// headers), but the dynamic loader would fail to find the symbols when actually
// trying to launch the program on macOS 10.13. To turn this into a compile-time
// issue instead, declarations are annotated with when they were introduced, and
// the compiler can produce a diagnostic if the program references something that
// isn't available on the deployment target.
//
// This mechanism is general in nature, and any vendor can add their markup to
// the library (see below). Whenever a new feature is added that requires support
// in the shared library, two macros are added below to allow marking the feature
// as unavailable:
// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` which must be defined
// exactly when compiling for a target that doesn't support the feature.
// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must always be defined
// and must expand to the proper availability attribute for the platform.
// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_<feature>` which must be defined
// to `_LIBCPP_INTRODUCED_IN_<version>` for the appropriate LLVM version.
// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must be defined to
// `_LIBCPP_INTRODUCED_IN_<version>_MARKUP` for the appropriate LLVM version.
//
// When vendors decide to ship the feature as part of their shared library, they
// can update these macros appropriately for their platform, and the library will
// use those to provide an optimal user experience.
// can update the `_LIBCPP_INTRODUCED_IN_<version>` macro (and the markup counterpart)
// based on the platform version they shipped that version of LLVM in. The library
// will then use this markup to provide an optimal user experience on these platforms.
//
// Furthermore, many features in the standard library have corresponding
// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` macros
// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_<feature>` macros
// are checked by the corresponding feature-test macros generated by
// generate_feature_test_macro_components.py to ensure that the library
// doesn't announce a feature as being implemented if it is unavailable on
@@ -74,237 +76,181 @@
// Availability markup is disabled when building the library, or when a non-Clang
// compiler is used because only Clang supports the necessary attributes.
// doesn't support the proper attributes.
#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCXXABI_BUILDING_LIBRARY) || !defined(_LIBCPP_COMPILER_CLANG_BASED)
# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
# endif
#endif
// When availability annotations are disabled, we take for granted that features introduced
// in all versions of the library are available.
#if defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
// These macros control the availability of std::bad_optional_access and
// other exception types. These were put in the shared library to prevent
// code bloat from every user program defining the vtable for these exception
// types.
//
// Note that when exceptions are disabled, the methods that normally throw
// these exceptions can be used even on older deployment targets, but those
// methods will abort instead of throwing.
# define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS 1
# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
# define _LIBCPP_INTRODUCED_IN_LLVM_4 1
# define _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP /* nothing */
# define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS 1
# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
# define _LIBCPP_INTRODUCED_IN_LLVM_9 1
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP /* nothing */
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_PUSH /* nothing */
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_POP /* nothing */
# define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST 1
# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST
# define _LIBCPP_INTRODUCED_IN_LLVM_10 1
# define _LIBCPP_INTRODUCED_IN_LLVM_10_MARKUP /* nothing */
// These macros control the availability of all parts of <filesystem> that
// depend on something in the dylib.
# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 1
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP
# define _LIBCPP_INTRODUCED_IN_LLVM_12 1
# define _LIBCPP_INTRODUCED_IN_LLVM_12_MARKUP /* nothing */
// This controls the availability of the C++20 synchronization library,
// which requires shared library support for various operations
// (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
// <semaphore>, and notification functions on std::atomic.
# define _LIBCPP_AVAILABILITY_HAS_SYNC 1
# define _LIBCPP_AVAILABILITY_SYNC
# define _LIBCPP_INTRODUCED_IN_LLVM_14 1
# define _LIBCPP_INTRODUCED_IN_LLVM_14_MARKUP /* nothing */
// Enable additional explicit instantiations of iostreams components. This
// reduces the number of weak definitions generated in programs that use
// iostreams by providing a single strong definition in the shared library.
//
// TODO: Enable additional explicit instantiations on GCC once it supports exclude_from_explicit_instantiation,
// or once libc++ doesn't use the attribute anymore.
// TODO: Enable them on Windows once https://llvm.org/PR41018 has been fixed.
# if !defined(_LIBCPP_COMPILER_GCC) && !defined(_WIN32)
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 1
# else
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
# endif
# define _LIBCPP_INTRODUCED_IN_LLVM_15 1
# define _LIBCPP_INTRODUCED_IN_LLVM_15_MARKUP /* nothing */
// This controls the availability of floating-point std::to_chars functions.
// These overloads were added later than the integer overloads.
# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 1
# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT
# define _LIBCPP_INTRODUCED_IN_LLVM_16 1
# define _LIBCPP_INTRODUCED_IN_LLVM_16_MARKUP /* nothing */
// This controls whether the library claims to provide a default verbose
// termination function, and consequently whether the headers will try
// to use it when the mechanism isn't overriden at compile-time.
# define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT 1
# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT
# define _LIBCPP_INTRODUCED_IN_LLVM_18 1
# define _LIBCPP_INTRODUCED_IN_LLVM_18_MARKUP /* nothing */
// This controls the availability of the C++17 std::pmr library,
// which is implemented in large part in the built library.
# define _LIBCPP_AVAILABILITY_HAS_PMR 1
# define _LIBCPP_AVAILABILITY_PMR
// These macros controls the availability of __cxa_init_primary_exception
// in the built library, which std::make_exception_ptr might use
// (see libcxx/include/__exception/exception_ptr.h).
# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 1
# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
// This controls the availability of C++23 <print>, which
// has a dependency on the built library (it needs access to
// the underlying buffer types of std::cout, std::cerr, and std::clog.
# define _LIBCPP_AVAILABILITY_HAS_PRINT 1
# define _LIBCPP_AVAILABILITY_PRINT
// This controls the availability of the C++20 time zone database.
// The parser code is built in the library.
# define _LIBCPP_AVAILABILITY_HAS_TZDB 1
# define _LIBCPP_AVAILABILITY_TZDB
// These macros determine whether we assume that std::bad_function_call and
// std::bad_expected_access provide a key function in the dylib. This allows
// centralizing their vtable and typeinfo instead of having all TUs provide
// a weak definition that then gets deduplicated.
# define _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION 1
# define _LIBCPP_AVAILABILITY_BAD_FUNCTION_CALL_KEY_FUNCTION
# define _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION 1
# define _LIBCPP_AVAILABILITY_BAD_EXPECTED_ACCESS_KEY_FUNCTION
# define _LIBCPP_INTRODUCED_IN_LLVM_19 1
# define _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP /* nothing */
#elif defined(__APPLE__)
# define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS \
(!defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) || __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 50000)
// LLVM 4
# if defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000
# define _LIBCPP_INTRODUCED_IN_LLVM_4 0
# define _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP __attribute__((availability(watchos, strict, introduced = 5.0)))
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_4 1
# define _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP /* nothing */
# endif
# define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS
# define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS
# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS __attribute__((availability(watchos, strict, introduced = 5.0)))
# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
// TODO: Update once this is released
# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 0
# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION __attribute__((unavailable))
// <filesystem>
// LLVM 9
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
// clang-format on
# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 0
# else
# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 1
# endif
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY \
__attribute__((availability(macos, strict, introduced = 10.15))) \
__attribute__((availability(ios, strict, introduced = 13.0))) \
__attribute__((availability(tvos, strict, introduced = 13.0))) \
__attribute__((availability(watchos, strict, introduced = 6.0)))
# define _LIBCPP_INTRODUCED_IN_LLVM_9 0
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP \
__attribute__((availability(macos, strict, introduced = 10.15))) \
__attribute__((availability(ios, strict, introduced = 13.0))) \
__attribute__((availability(tvos, strict, introduced = 13.0))) \
__attribute__((availability(watchos, strict, introduced = 6.0)))
// clang-format off
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH \
_Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")
# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop")
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_PUSH \
_Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \
_Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_POP \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop") \
_Pragma("clang attribute pop")
// clang-format on
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_9 1
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP /* nothing */
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_PUSH /* nothing */
# define _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_POP /* nothing */
# endif
// std::to_chars(floating-point)
// LLVM 10
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130300) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160300) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160300) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90300)
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
// clang-format on
# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 0
# define _LIBCPP_INTRODUCED_IN_LLVM_10 0
# define _LIBCPP_INTRODUCED_IN_LLVM_10_MARKUP \
__attribute__((availability(macos, strict, introduced = 11.0))) \
__attribute__((availability(ios, strict, introduced = 14.0))) \
__attribute__((availability(tvos, strict, introduced = 14.0))) \
__attribute__((availability(watchos, strict, introduced = 7.0)))
# else
# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 1
# endif
# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT \
__attribute__((availability(macos, strict, introduced = 13.3))) \
__attribute__((availability(ios, strict, introduced = 16.3))) \
__attribute__((availability(tvos, strict, introduced = 16.3))) \
__attribute__((availability(watchos, strict, introduced = 9.3)))
// c++20 synchronization library
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
// clang-format on
# define _LIBCPP_AVAILABILITY_HAS_SYNC 0
# else
# define _LIBCPP_AVAILABILITY_HAS_SYNC 1
# endif
# define _LIBCPP_AVAILABILITY_SYNC \
__attribute__((availability(macos, strict, introduced = 11.0))) \
__attribute__((availability(ios, strict, introduced = 14.0))) \
__attribute__((availability(tvos, strict, introduced = 14.0))) \
__attribute__((availability(watchos, strict, introduced = 7.0)))
// __libcpp_verbose_abort
// TODO: Update once this is released
# define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT 0
# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT __attribute__((unavailable))
// std::pmr
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100000)
// clang-format on
# define _LIBCPP_AVAILABILITY_HAS_PMR 0
# else
# define _LIBCPP_AVAILABILITY_HAS_PMR 1
# endif
// TODO: Enable std::pmr markup once https://github.com/llvm/llvm-project/issues/40340 has been fixed
// Until then, it is possible for folks to try to use `std::pmr` when back-deploying to targets that don't support
// 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
// use availability annotations until that bug has been fixed.
# if 0
# define _LIBCPP_AVAILABILITY_PMR \
__attribute__((availability(macos, strict, introduced = 14.0))) \
__attribute__((availability(ios, strict, introduced = 17.0))) \
__attribute__((availability(tvos, strict, introduced = 17.0))) \
__attribute__((availability(watchos, strict, introduced = 10.0)))
# else
# define _LIBCPP_AVAILABILITY_PMR
# define _LIBCPP_INTRODUCED_IN_LLVM_10 1
# define _LIBCPP_INTRODUCED_IN_LLVM_10_MARKUP /* nothing */
# endif
# define _LIBCPP_AVAILABILITY_HAS_TZDB 0
# define _LIBCPP_AVAILABILITY_TZDB __attribute__((unavailable))
// Warning: This availability macro works differently than the other macros.
// The dylib part of print is not needed on Apple platforms. Therefore when
// the macro is not available the code calling the dylib is commented out.
// The macro _LIBCPP_AVAILABILITY_PRINT is not used.
# define _LIBCPP_AVAILABILITY_HAS_PRINT 0
# define _LIBCPP_AVAILABILITY_PRINT __attribute__((unavailable))
// LLVM 12
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 120000) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 150000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 150000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 80000)
// clang-format on
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
# define _LIBCPP_INTRODUCED_IN_LLVM_12 0
# define _LIBCPP_INTRODUCED_IN_LLVM_12_MARKUP \
__attribute__((availability(macos, strict, introduced = 12.0))) \
__attribute__((availability(ios, strict, introduced = 15.0))) \
__attribute__((availability(tvos, strict, introduced = 15.0))) \
__attribute__((availability(watchos, strict, introduced = 8.0)))
# else
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 1
# define _LIBCPP_INTRODUCED_IN_LLVM_12 1
# define _LIBCPP_INTRODUCED_IN_LLVM_12_MARKUP /* nothing */
# endif
# define _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION 0
# define _LIBCPP_AVAILABILITY_BAD_FUNCTION_CALL_KEY_FUNCTION __attribute__((unavailable))
// LLVM 14
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130400) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160500) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160500) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90500)
// clang-format on
# define _LIBCPP_INTRODUCED_IN_LLVM_14 0
# define _LIBCPP_INTRODUCED_IN_LLVM_14_MARKUP \
__attribute__((availability(macos, strict, introduced = 13.4))) \
__attribute__((availability(ios, strict, introduced = 16.5))) \
__attribute__((availability(tvos, strict, introduced = 16.5))) \
__attribute__((availability(watchos, strict, introduced = 9.5)))
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_14 1
# define _LIBCPP_INTRODUCED_IN_LLVM_14_MARKUP /* nothing */
# endif
# define _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION 0
# define _LIBCPP_AVAILABILITY_BAD_EXPECTED_ACCESS_KEY_FUNCTION __attribute__((unavailable))
// LLVM 15-16
# define _LIBCPP_INTRODUCED_IN_LLVM_15 _LIBCPP_INTRODUCED_IN_LLVM_16
# define _LIBCPP_INTRODUCED_IN_LLVM_15_MARKUP _LIBCPP_INTRODUCED_IN_LLVM_16_MARKUP
// clang-format off
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140000) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100000)
// clang-format on
# define _LIBCPP_INTRODUCED_IN_LLVM_16 0
# define _LIBCPP_INTRODUCED_IN_LLVM_16_MARKUP \
__attribute__((availability(macos, strict, introduced = 14.0))) \
__attribute__((availability(ios, strict, introduced = 17.0))) \
__attribute__((availability(tvos, strict, introduced = 17.0))) \
__attribute__((availability(watchos, strict, introduced = 10.0)))
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_16 1
# define _LIBCPP_INTRODUCED_IN_LLVM_16_MARKUP /* nothing */
# endif
// LLVM 18
// TODO: Fill this in
# if 1
# define _LIBCPP_INTRODUCED_IN_LLVM_18 0
# define _LIBCPP_INTRODUCED_IN_LLVM_18_MARKUP __attribute__((unavailable))
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_18 1
# define _LIBCPP_INTRODUCED_IN_LLVM_18_MARKUP /* nothing */
# endif
// LLVM 19
// TODO: Fill this in
# if 1
# define _LIBCPP_INTRODUCED_IN_LLVM_19 0
# define _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP __attribute__((unavailable))
# else
# define _LIBCPP_INTRODUCED_IN_LLVM_19 1
# define _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP /* nothing */
# endif
#else
@@ -315,6 +261,97 @@
#endif
// These macros control the availability of std::bad_optional_access and
// other exception types. These were put in the shared library to prevent
// code bloat from every user program defining the vtable for these exception
// types.
//
// Note that when exceptions are disabled, the methods that normally throw
// these exceptions can be used even on older deployment targets, but those
// methods will abort instead of throwing.
#define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4
#define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP
#define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4
#define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP
#define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST _LIBCPP_INTRODUCED_IN_LLVM_4
#define _LIBCPP_AVAILABILITY_BAD_ANY_CAST _LIBCPP_INTRODUCED_IN_LLVM_4_MARKUP
// These macros control the availability of all parts of <filesystem> that
// depend on something in the dylib.
#define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY _LIBCPP_INTRODUCED_IN_LLVM_9
#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP
#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_PUSH
#define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP _LIBCPP_INTRODUCED_IN_LLVM_9_MARKUP_POP
// This controls the availability of the C++20 synchronization library,
// which requires shared library support for various operations
// (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
// <semaphore>, and notification functions on std::atomic.
#define _LIBCPP_AVAILABILITY_HAS_SYNC _LIBCPP_INTRODUCED_IN_LLVM_10
#define _LIBCPP_AVAILABILITY_SYNC _LIBCPP_INTRODUCED_IN_LLVM_10_MARKUP
// Enable additional explicit instantiations of iostreams components. This
// reduces the number of weak definitions generated in programs that use
// iostreams by providing a single strong definition in the shared library.
//
// TODO: Enable additional explicit instantiations on GCC once it supports exclude_from_explicit_instantiation,
// or once libc++ doesn't use the attribute anymore.
// TODO: Enable them on Windows once https://llvm.org/PR41018 has been fixed.
#if !defined(_LIBCPP_COMPILER_GCC) && !defined(_WIN32)
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 _LIBCPP_INTRODUCED_IN_LLVM_12
#else
# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
#endif
// This controls the availability of floating-point std::to_chars functions.
// These overloads were added later than the integer overloads.
#define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT _LIBCPP_INTRODUCED_IN_LLVM_14
#define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT _LIBCPP_INTRODUCED_IN_LLVM_14_MARKUP
// This controls whether the library claims to provide a default verbose
// termination function, and consequently whether the headers will try
// to use it when the mechanism isn't overriden at compile-time.
#define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT _LIBCPP_INTRODUCED_IN_LLVM_15
#define _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_INTRODUCED_IN_LLVM_15_MARKUP
// This controls the availability of the C++17 std::pmr library,
// which is implemented in large part in the built library.
//
// TODO: Enable std::pmr markup once https://github.com/llvm/llvm-project/issues/40340 has been fixed
// Until then, it is possible for folks to try to use `std::pmr` when back-deploying to targets that don't support
// 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
// use availability annotations until that bug has been fixed.
#define _LIBCPP_AVAILABILITY_HAS_PMR _LIBCPP_INTRODUCED_IN_LLVM_16
#define _LIBCPP_AVAILABILITY_PMR
// These macros controls the availability of __cxa_init_primary_exception
// in the built library, which std::make_exception_ptr might use
// (see libcxx/include/__exception/exception_ptr.h).
#define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION _LIBCPP_INTRODUCED_IN_LLVM_18
#define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION _LIBCPP_INTRODUCED_IN_LLVM_18_MARKUP
// This controls the availability of C++23 <print>, which
// has a dependency on the built library (it needs access to
// the underlying buffer types of std::cout, std::cerr, and std::clog.
#define _LIBCPP_AVAILABILITY_HAS_PRINT _LIBCPP_INTRODUCED_IN_LLVM_18
#define _LIBCPP_AVAILABILITY_PRINT _LIBCPP_INTRODUCED_IN_LLVM_18_MARKUP
// This controls the availability of the C++20 time zone database.
// The parser code is built in the library.
#define _LIBCPP_AVAILABILITY_HAS_TZDB _LIBCPP_INTRODUCED_IN_LLVM_19
#define _LIBCPP_AVAILABILITY_TZDB _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP
// These macros determine whether we assume that std::bad_function_call and
// std::bad_expected_access provide a key function in the dylib. This allows
// centralizing their vtable and typeinfo instead of having all TUs provide
// a weak definition that then gets deduplicated.
# define _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19
# define _LIBCPP_AVAILABILITY_BAD_FUNCTION_CALL_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP
# define _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19
# define _LIBCPP_AVAILABILITY_BAD_EXPECTED_ACCESS_KEY_FUNCTION _LIBCPP_INTRODUCED_IN_LLVM_19_MARKUP
// Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.
// Those are defined in terms of the availability attributes above, and
// should not be vendor-specific.