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when implementing an optional protocol requirement When an Objective-C method implements an optional protocol requirement, allow the method to use a newer introduced or older obsoleted availability version than what's specified on the method in the protocol itself. This allows SDK adopters to adopt an optional method from a protocol later than when the method is introduced in the protocol. The users that call an optional method on an object that conforms to this protocol are supposed to check whether the object implements the method or not, so a lack of appropriate `if (@available)` check for a new OS version is not a cause of concern as there's already another runtime check that's required. Differential Revision: https://reviews.llvm.org/D102459 |
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runtime | ||
test | ||
tools | ||
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CMakeLists.txt | ||
CODE_OWNERS.TXT | ||
INSTALL.txt | ||
LICENSE.TXT | ||
ModuleInfo.txt | ||
NOTES.txt | ||
README.txt |
//===----------------------------------------------------------------------===// // C Language Family Front-end //===----------------------------------------------------------------------===// Welcome to Clang. This is a compiler front-end for the C family of languages (C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM compiler infrastructure project. Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer. If you're interested in more (including how to build Clang) it is best to read the relevant web sites. Here are some pointers: Information on Clang: http://clang.llvm.org/ Building and using Clang: http://clang.llvm.org/get_started.html Clang Static Analyzer: http://clang-analyzer.llvm.org/ Information on the LLVM project: http://llvm.org/ If you have questions or comments about Clang, a great place to discuss them is on the Clang development mailing list: http://lists.llvm.org/mailman/listinfo/cfe-dev If you find a bug in Clang, please file it in the LLVM bug tracker: http://llvm.org/bugs/