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This post describes the goals, release process, and estimated schedule forSwift 5.0.

Motivation and Goals

The primary goal of Swift 5.0 is for the language toachieve ABI stability. This will enable a stable Swiftruntime to be deployed by OS vendors that can be linked against by executablesand libraries.

Related to ABI stability, module stabilitywill be a primary focal point as well. This willland in either the Swift 5.0 release or in a subsequent 5.x releasedepending on its readiness.

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Binary Compatibility

Swift 5.0 is not binary compatible with earlier Swift releases. Binarycompatibility allows Swift code compiled by different Swift compilers tolink together and interoperate at a runtime level.

However, future Swift releases will be binary compatible with Swift 5.

Source Compatibility

As with Swift 4.2, the vast majority of sources that built with the Swift 4.2compiler should compile with the Swift 5.0 compiler.

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However, the Swift 3 compatibility mode will not be supported in the Swift 5compiler. Swift 4.2 is the last release of Swift to support Swift 3 mode.There are important changes to both the surface of the language and theinterior of its implementation in the releases following Swift 3 that will bethe basis of future (and lasting) source and binary stability.

Snapshots of Swift 5.0

Downloadable snapshots of the Swift 5.0 release branch will be postedregularly as part of continuous integration testing.

Once Swift 5.0 is released, the official final builds will also be posted inaddition to the snapshots.

Getting Changes into Swift 5.0

The swift-5.0-branch contains the changes that will be released in Swift5.0. The branch will be managed as follows:

• The swift-5.0-branch has already been initially cut from master.

• Periodically, the master development branch will be merged intoswift-5.0-branch until the final branch date. Beascost.

• November 16, 2018 (final branching): The swift-5.0-branch will havechanges merged from master one last time. After the final branch datethere will be a 'bake' period in which only select, critical fixes will gointo the release (via pull requests).

Five notable exceptions to this plan are swift-package-manager,swift-llbuild, swift-corelibs-foundation, swift-corelibs-xctest, andswift-corelibs-libdispatch whichwill merge from master into swift-5.0-branch daily and whose final cutoffdate for changes will extend beyond November 16 and will be announced later.

Philosophy on Taking Changes into Swift 5.0

• All language and API changes for Swift 5.0 will go through the SwiftEvolution process, with criteriafor what changes are in scope for the release documented there.

• Other changes (e.g., bug fixes, diagnostic improvements, SourceKit interfaceimprovements) will be accepted based on their risk and impact.

• Low-risk test tweaks will also be accepted late into the release branch ifit aids in the qualification of the release.

• As the release converges, the criteria for accepted changes will becomeincreasingly restrictive.

Impacted Repositories

The following repositories will have a swift-5.0-branch branch to tracksources as part of Swift 5.0 release:

Release Managers

The overall management of the release will be overseen by the followingindividuals, who will announce when stricter control of change goes intoeffect for the Swift 5.0 release as the release converges:

• Ted Kremenek is the overall release manager for Swift 5.0.

• Duncan Exon Smith is the release manager forswift-llvm, swift-clang, and swift-compiler-rt.

• Fred Riss is the release manager for swift-lldb.

• Ben Cohen is the release manager for theSwift Standard Library.

• Tony Parker is the release manager forswift-corelibs-foundation.

• Pierre Habouzit is the release manager forswift-corelibs-libdispatch.

• Brian Croom is the release manager forswift-corelibs-xctest.

• Rick Ballard is the release manager forswift-package-manager.

• Daniel Dunbar is the release manager forswift-llbuild.

Please feel free to post on the development forumor contact Ted Kremenek directly concerning any questions about the release managementprocess.

The following repositories will have a swift-5.0-branch branch to tracksources as part of Swift 5.0 release:

Release Managers

The overall management of the release will be overseen by the followingindividuals, who will announce when stricter control of change goes intoeffect for the Swift 5.0 release as the release converges:

• Ted Kremenek is the overall release manager for Swift 5.0.

• Duncan Exon Smith is the release manager forswift-llvm, swift-clang, and swift-compiler-rt.

• Fred Riss is the release manager for swift-lldb.

• Ben Cohen is the release manager for theSwift Standard Library.

• Tony Parker is the release manager forswift-corelibs-foundation.

• Pierre Habouzit is the release manager forswift-corelibs-libdispatch.

• Brian Croom is the release manager forswift-corelibs-xctest.

• Rick Ballard is the release manager forswift-package-manager.

• Daniel Dunbar is the release manager forswift-llbuild.

Please feel free to post on the development forumor contact Ted Kremenek directly concerning any questions about the release managementprocess.

Pull Requests for Release Branch

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In order for a pull request to be considered for inclusion in the releasebranch after the final re-branch from master it must include the followinginformation:

• Explanation: A description of the issue being fixed or enhancement beingmade. This can be brief, but it should be clear.

• Scope: An assessment of the impact/importance of the change. Forexample, is the change a source-breaking language change, etc.

• SR Issue: The SR if the change fixes/implements an issue/enhancement onbugs.swift.org.

• Risk: What is the (specific) risk to the release for taking this change?

• Testing: What specific testing has been done or needs to be done tofurther validate any impact of this change?

• Reviewer: One or more code ownersfor the impacted components should review the change. Technical review canbe delegated by a code owner or otherwise requested as deemed appropriate oruseful.

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All change going into the swift-5.0-branch (outside changes being mergedin automatically from master) must go through pull requests that areaccepted by the corresponding release manager.