swift build -c release
Generated on 4/29/2025
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The command swift build -c release is used to build a Swift package in release configuration, which optimizes the build for performance. At WWDC 2024, there were several sessions that discussed improvements in Swift and Xcode that could impact how builds are handled.
In the session What’s new in Swift, improvements to how Xcode builds Swift code were highlighted. These improvements include better parallelism and more predictable builds through the use of explicitly built modules. This means that when you build your Swift code, the modules can be built in parallel, leading to faster and more efficient builds.
Additionally, the session What’s new in Xcode 16 introduced explicit modules, which are enabled by default for C and Objective-C, and can be opted into for Swift. This feature improves build performance by allowing better parallelism and faster debugging.
For more detailed information on explicitly built modules, you can refer to the session Demystify explicitly built modules, which explains how these modules work and how they can optimize your build process.
These sessions collectively provide insights into the advancements in build processes for Swift and Xcode, which can enhance the performance and efficiency of building Swift projects, especially in release configurations.
Analyze heap memory
Dive into the basis for your app’s dynamic memory: the heap! Explore how to use Instruments and Xcode to measure, analyze, and fix common heap issues. We’ll also cover some techniques and best practices for diagnosing transient growth, persistent growth, and leaks in your app.
Demystify explicitly built modules
Explore how builds are changing in Xcode 16 with explicitly built modules. Discover how modules are used to build your code, how explicitly built modules improve transparency in compilation tasks, and how you can optimize your build by sharing modules across targets.
Platforms State of the Union
Discover the newest advancements on Apple platforms.
Migrate your app to Swift 6
Experience Swift 6 migration in action as we update an existing sample app. Learn how to migrate incrementally, module by module, and how the compiler helps you identify code that’s at risk of data races. Discover different techniques for ensuring clear isolation boundaries and eliminating concurrent access to shared mutable state.
What’s new in Xcode 16
Discover the latest productivity and performance improvements in Xcode 16. Learn about enhancements to code completion, diagnostics, and Xcode Previews. Find out more about updates in builds and explore improvements in debugging and Instruments.
Xcode essentials
Edit, debug, commit, repeat. Explore the suite of tools in Xcode that help you iterate quickly when developing apps. Discover tips and tricks to help optimize and boost your development workflow.
Platforms State of the Union 5-Minute Recap
Watch a quick recap of the newest advancements on Apple platforms.
What’s new in Swift
Join us for an update on Swift. We’ll briefly go through a history of Swift over the past decade, and show you how the community has grown through workgroups, expanded the package ecosystem, and increased platform support. We’ll introduce you to a new language mode that achieves data-race safety by default, and a language subset that lets you run Swift on highly constrained systems. We’ll also explore some language updates including noncopyable types, typed throws, and improved C++ interoperability.
Meet Swift Testing
Introducing Swift Testing: a new package for testing your code using Swift. Explore the building blocks of its powerful new API, discover how it can be applied in common testing workflows, and learn how it relates to XCTest and open source Swift.