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| GNUstep Objective-C Runtime 2.2 | ||
| =============================== | ||
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| This is the second update to the second major release of the GNUstep Objective-C | ||
| runtime (a.k.a. libobjc2). This runtime was designed to support the features | ||
| of modern dialects of Objective-C for use with GNUstep and other Objective-C | ||
| programs. | ||
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| Highlights of this release include: | ||
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| - Initial support for RISC-V 64-bit (rv64) including an architecture-specific | ||
| objc_msgSend, and block trampoline implementation. Please note that | ||
| double-precision floating-point support (rv64d) is required for the | ||
| objc_msgSend implementation. | ||
| - Initial support for Windows on ARM64 with fast-path objc_msgSend. | ||
| - Numerous improvements to the Objective-C++ exception interoperation code. | ||
| The runtime now dynamically detects whether the libcxxrt, libsupc++, or | ||
| libc++abi variant of the Itanium C++ Exception ABI is being used. This is | ||
| the first version to support exception interoperability with libc++abi. | ||
| - Because we no longer need to identify the specific C++ runtime, we can link | ||
| to it indirectly via the C++ standard library, which enables more C++ to be | ||
| used in the Objective-C runtime. | ||
| - The minimum CMake version has been bumped to 3.16, which supports | ||
| Objective-C. This support is now used, simplifying the build. | ||
| - Support for GC mode is gone. Apple dropped support for this a long time ago. | ||
| - `objc_setUncaughtExceptionHandler` is added, which avoids consuming code | ||
| needing to access a library-owned global. | ||
| - The selector-table code has been rewritten in C++, improving performance of | ||
| adding selectors. This is unlikely to have a measurable impact on | ||
| performance outside of contrived test cases, but the new code is more | ||
| maintainable. | ||
| - Several bug fixes in the ARC code, especially in corner cases surrounding | ||
| weak references. | ||
| - Support for fast-path allocation / initialisation functions. Root classes | ||
| that opt into this should implement `+_TrivialAllocInit` (this can be an | ||
| empty method, it is not called). Clang 18 or later will emit calls to the | ||
| fast-path functions for `+alloc`, `+allocWithZone:` and `+alloc` + `-init` | ||
| calls. This should improve code density as well as performance. | ||
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| You may obtain the code for this release from git and use the 2.2 branch: | ||
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| https://github.com/gnustep/libobjc2.git | ||
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| Alternatively, a tarball is available from: | ||
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| https://github.com/gnustep/libobjc2/archive/v2.2.zip | ||
| https://github.com/gnustep/libobjc2/archive/v2.2.tar.gz | ||
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| The runtime library is responsible for implementing the core features of the | ||
| object model, as well as exposing introspection features to the user. The | ||
| GNUstep runtime implements a superset of Apple's Objective-C Runtime APIs. | ||
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| If you come across any problems, please file them in the issue tracker: | ||
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| https://github.com/gnustep/libobjc2/issues |