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https://stackoverflow.com/questions/56708/objective-c-for-windows
With the advent of gcc 4.6, support for Objective-C 2.0 language features (blocks, dot syntax, synthesised properties, etc) was added to the Objective-C compiler (see the release notes for full details). Their runtime has also been updated to work almost identically to Apple's own Objective-C 2.0 runtime.
https://en.wikipedia.org/wiki/Objective-C
Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. It was the main programming language supported by Apple for the macOS, iOS and iPadOS operating systems, and their respective application programming interfaces (APIs) Cocoa and Cocoa Touch until the introduction of Swift in 2014.Designed by: Tom Love and Brad Cox
https://stackoverflow.com/questions/4644814/are-objective-c-blocks-supported-by-compilers-on-linux
The official GCC does not include blocks support. For that, you either need to use Apple's patches, or use clang, an LLVM-based compiler that has good Objective-C support (because Apple has been funding its development). On linux, you're probably better off not trying to apply Apple's patches to GCC. Just go with clang.
https://gcc.gnu.org/onlinedocs/gcc-7.4.0/gcc/Objective-C-and-Objective-C_002b_002b-Dialect-Options.html
In this example, -fgnu-runtime is an option meant only for Objective-C and Objective-C++ programs; you can use the other options with any language supported by GCC. Note that since Objective-C is an extension of the C language, Objective-C compilations may also use options specific to the C front-end (e.g., -Wtraditional).
https://gcc.gnu.org/onlinedocs/gcc-9.1.0/gcc/Standards.html
GCC supports Objective-C++ and features available in Objective-C are also available in Objective-C++. GCC by default uses the GNU Objective-C runtime library, which is part of GCC and is not the same as the Apple/NeXT Objective-C runtime library used on Apple systems. There are a number of differences documented in this manual.
https://dev.haiku-os.org/ticket/3561
Obviously, what you are getting at is having the GCC optional package have Objective C support though. I think the best plan is to set up something at Haiku Ports in sys-devel for GCC so anybody can build GCC however they want, including other language support, for example.
http://www.gnustep.it/nicola/Presentations/2011/Objective-C_in_GCC_4.6.pdf
GCC 4.6 Objective-C compiler improvements and bug fxes: fxed about 50 bugs between objc compiler, objc++ compiler and libobjc a better compiler even for “traditional” Objective-C Objective-C 2.0: Syntax changes (declared and synthesized properties, dot syntax, fast enumeration, optional protocol methods, method/protocol/class attributes, class extensions)
http://wiki.gnustep.org/index.php/Objective-C_Compiler_and_Runtime_FAQ
There is an effort underway to rewrite LLVM-GCC as a plugin for GCC 4.5, at which point it should support as much Objective-C as GCC currently does. Unlike GCC, Clang features a clean abstraction layer between the runtime-specific and runtime-agnostic parts of the compiler.
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