Question
Answer and Explanation
Determining the exact version of Apple Swift used to build an SDK can sometimes be tricky, as it often depends on the specific SDK and the build environment employed by the SDK's developers. Apple typically keeps its tools and technologies updated, including the Swift compiler, to ensure developers have the latest capabilities.
Generally, when referring to an Apple SDK (such as the iOS SDK, macOS SDK, watchOS SDK, or tvOS SDK), the Swift version used to compile it aligns with the latest stable version of Swift available when the SDK was released or updated. Here’s how you can approach finding out this information:
1. Check the Release Notes:
- Always begin by consulting the official release notes of the SDK. Apple usually specifies the Swift compiler version that was used. These release notes can be found on the Apple Developer website. Look for sections detailing compatibility and compiler versions.
2. SDK Documentation:
- Sometimes, specific SDK documentation will mention the supported Swift version, especially for important updates or when major Swift language version changes are involved.
3. Compiler Compatibility in Xcode:
- When you're working with an SDK in Xcode, the IDE will often alert you if there is a version mismatch between the SDK and the Swift compiler version you have chosen. You can usually find project build settings to specify the Swift version.
4. Framework Compatibility:
- If you're referencing third-party Swift frameworks or libraries alongside Apple’s SDK, you'll also need to ensure that all versions are compatible. The framework documentation is crucial in these cases.
5. Swift Language Version Settings in Your Project:
- In Xcode, you can set the Swift language version for your projects. If an SDK has specific requirements, this could be mentioned in its documentation or might become evident during build times if you get errors.
General Guidance
- Apple tends to upgrade the Swift version with each major release of Xcode and associated SDKs. While specific details should be confirmed through official documentation, keeping Xcode up to date typically ensures your development environment uses compatible toolchains.
- It's important to maintain compatibility because code compiled with a particular Swift version is not necessarily forward- or backward-compatible with other versions of Swift. The general recommendation is to use the latest tools to keep everything in sync.
In conclusion, while there isn’t a single place to see the version of Swift each individual SDK is built with, the combination of release notes, SDK documentation, Xcode settings, and attention to framework compatibility should give you the information necessary to have a successful build.