Swift 5.1 Release Process

The primary goal of Swift 5.1 is for the language to achieve module stability.

→ swift.org/blog/5.1-release-process/

Swift 5.1 aims to achieve module stability for the language. On Apple platforms, it keeps binary compatibility with Swift 5.0 and future releases because the ABI is now stable.

On other platforms like Linux, the ABI is not yet fully stable to allow more testing, especially for new Linux-based platforms. The release expects most source code from Swift 5.0 to compile, but bug fixes may find errors in code that built before.