Swift 6.3 Released

Swift is designed to be the language you reach for at every layer of the software stack. Whether you’re building embedded firmware, internet-scale services, or full-featured mobile apps, Swift delivers strong safety guarantees, performance control when you need it, and expressive language features and APIs.

Swift.org

> Swift 6.3 introduces the @c attribute, which lets you expose Swift functions and enums to C code in your project. Annotating a function or enum with @c prompts Swift to include a corresponding declaration in the generated C header that you can include in your C/C++ files

Why did this take so long to be added? Such strange priorities. Adding an entire C++ compiler for C++ interoperability before adding... C exports. Bizarre.

They had it earlier, as an underscored attribute.