// -*- C++ -*- //===----------------------------------------------------------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #ifndef _LIBCPP___CONFIGURATION_AVAILABILITY_H #define _LIBCPP___CONFIGURATION_AVAILABILITY_H #include <__configuration/compiler.h> #include <__configuration/language.h> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) # pragma GCC system_header #endif // Libc++ is shipped by various vendors. In particular, it is used as a system // library on macOS, iOS and other Apple platforms. In order for users to be // able to compile a binary that is intended to be deployed to an older version // of a platform, Clang provides availability attributes [1]. These attributes // can be placed on declarations and are used to describe the life cycle of a // symbol in the library. // // The main goal is to ensure a compile-time error if a symbol that hasn't been // introduced in a previously released library is used in a program that targets // 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 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_<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 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_<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 // the deployment target. // // Note that this mechanism is disabled by default in the "upstream" libc++. // Availability annotations are only meaningful when shipping libc++ inside // a platform (i.e. as a system library), and so vendors that want them should // turn those annotations on at CMake configuration time. // // [1]: https://clang.llvm.org/docs/AttributeReference.html#availability // For backwards compatibility, allow users to define _LIBCPP_DISABLE_AVAILABILITY // for a while. #if defined(_LIBCPP_DISABLE_AVAILABILITY) # if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS) #define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS # endif #endif // Availability markup is disabled when building the library, or when a non-Clang // compiler is used because only Clang supports the necessary 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) #define _LIBCPP_INTRODUCED_IN_LLVM_19 … #define _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_18 … #define _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_17 … #define _LIBCPP_INTRODUCED_IN_LLVM_17_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_16 … #define _LIBCPP_INTRODUCED_IN_LLVM_16_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_15 … #define _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_14 … #define _LIBCPP_INTRODUCED_IN_LLVM_14_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_13 … #define _LIBCPP_INTRODUCED_IN_LLVM_13_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_12 … #define _LIBCPP_INTRODUCED_IN_LLVM_12_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_11 … #define _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_10 … #define _LIBCPP_INTRODUCED_IN_LLVM_10_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_9 … #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_PUSH … #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_POP … #define _LIBCPP_INTRODUCED_IN_LLVM_8 … #define _LIBCPP_INTRODUCED_IN_LLVM_8_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_4 … #define _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE … #elif defined(__APPLE__) // clang-format off // LLVM 19 // TODO: Fill this in #define _LIBCPP_INTRODUCED_IN_LLVM_19 … #define _LIBCPP_INTRODUCED_IN_LLVM_19_ATTRIBUTE … // LLVM 18 // TODO: Fill this in #define _LIBCPP_INTRODUCED_IN_LLVM_18 … #define _LIBCPP_INTRODUCED_IN_LLVM_18_ATTRIBUTE … // LLVM 17 # if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140400) || \ (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170400) || \ (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170400) || \ (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100400) #define _LIBCPP_INTRODUCED_IN_LLVM_17 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_17 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_17_ATTRIBUTE … // LLVM 16 # 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) #define _LIBCPP_INTRODUCED_IN_LLVM_16 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_16 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_16_ATTRIBUTE … // LLVM 15 # 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) #define _LIBCPP_INTRODUCED_IN_LLVM_15 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_15 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_15_ATTRIBUTE … // LLVM 14 #define _LIBCPP_INTRODUCED_IN_LLVM_14 … #define _LIBCPP_INTRODUCED_IN_LLVM_14_ATTRIBUTE … // LLVM 13 # if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130000) || \ (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160000) || \ (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160000) || \ (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90000) #define _LIBCPP_INTRODUCED_IN_LLVM_13 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_13 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_13_ATTRIBUTE … // LLVM 12 # if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 120300) || \ (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 150300) || \ (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 150300) || \ (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 80300) #define _LIBCPP_INTRODUCED_IN_LLVM_12 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_12 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_12_ATTRIBUTE … // LLVM 11 # 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) #define _LIBCPP_INTRODUCED_IN_LLVM_11 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_11 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE … // LLVM 10 #define _LIBCPP_INTRODUCED_IN_LLVM_10 … #define _LIBCPP_INTRODUCED_IN_LLVM_10_ATTRIBUTE … // LLVM 9 # 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) #define _LIBCPP_INTRODUCED_IN_LLVM_9 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_9 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE … #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_PUSH … #define _LIBCPP_INTRODUCED_IN_LLVM_9_ATTRIBUTE_POP … // LLVM 4 # if defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000 #define _LIBCPP_INTRODUCED_IN_LLVM_4 … # else #define _LIBCPP_INTRODUCED_IN_LLVM_4 … # endif #define _LIBCPP_INTRODUCED_IN_LLVM_4_ATTRIBUTE … // clang-format on #else // ...New vendors can add availability markup here... # error \ "It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!" #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 … #define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS … #define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS … #define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS … #define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST … #define _LIBCPP_AVAILABILITY_BAD_ANY_CAST … // These macros control the availability of all parts of <filesystem> that // depend on something in the dylib. #define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY … #define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY … #define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH … #define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_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 … #define _LIBCPP_AVAILABILITY_SYNC … // 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 … #else #define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 … #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 … #define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT … // 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 … #define _LIBCPP_AVAILABILITY_VERBOSE_ABORT … // 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 … #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 … #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 … #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 … #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 … #define _LIBCPP_AVAILABILITY_BAD_FUNCTION_CALL_KEY_FUNCTION … #define _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION … #define _LIBCPP_AVAILABILITY_BAD_EXPECTED_ACCESS_KEY_FUNCTION … // 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. #if defined(_LIBCPP_HAS_NO_EXCEPTIONS) #define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST #define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS #define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS #else #define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST … #define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS … #define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS … #endif // Define availability attributes that depend on both // _LIBCPP_HAS_NO_EXCEPTIONS and _LIBCPP_HAS_NO_RTTI. #if defined(_LIBCPP_HAS_NO_EXCEPTIONS) || defined(_LIBCPP_HAS_NO_RTTI) # undef _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION # undef _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION #define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION … #define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION #endif #endif // _LIBCPP___CONFIGURATION_AVAILABILITY_H
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