Resolving the ARMv7s Architecture Error in iOS Static Libraries

28 February 2025 Stephan Petzl Leave a comment Xcode

Encountering the “ld: file is universal (3 slices) but does not contain a(n) armv7s slice” error can be a stumbling block when upgrading Xcode versions, particularly when using external static libraries. This error arises because the library in question lacks support for the ARMv7s architecture, a requirement introduced in newer iOS devices. Fortunately, there are strategies to bypass this hurdle until the library developer provides an update.

Understanding the Issue

This error typically occurs when the linker is unable to find the necessary architecture slices in a static library. The ARMv7s architecture was introduced to optimize performance for certain iOS devices, and if your library does not include this architecture, the build process will fail.

Solutions to Bypass the ARMv7s Architecture Error

Modify Build Settings

One of the most straightforward solutions is to modify your project’s build settings. You can remove the ARMv7s architecture from the “Valid Architectures” list in your project. Here’s how:

• Navigate to Project > Build Settings
• Locate the Valid Architectures setting
• Remove armv7s from the list

This adjustment acts as a temporary measure, allowing the project to compile without needing the ARMv7s slice, while you await an update from the library developer.

Toggle “Build Active Architecture Only”

Another viable workaround is to toggle the “Build Active Architecture Only” setting to “Yes” for the debug configuration. This setting ensures that only the currently active architecture is built, bypassing the need for ARMv7s support during development.

• Go to your target’s build settings
• Set Build Active Architecture Only to Yes for the debug configuration

Remember to switch this setting back to “No” for release builds to ensure comprehensive architecture support.

Advanced Solution: Library Modification

For those comfortable with a more technical approach, you can modify the library itself. This involves using tools like lipo to split the library into its constituent architectures, duplicate and modify the ARMv7 slice, and reassemble the library. This method should be approached with caution, as it can lead to unexpected issues if not done correctly.

Enhancing Test Automation with Repeato

While addressing architecture issues is crucial, ensuring your apps perform well across all configurations is equally important. This is where a robust test automation tool like Repeato can make a significant difference. Repeato is a no-code test automation tool that supports iOS, Android, and web apps, allowing you to create, run, and maintain automated tests efficiently.

Leveraging computer vision and AI, Repeato offers a fast test recording capability, making it a practical alternative to other tools like Katalon. With support for data-driven and keyword-driven testing, Repeato ensures your app’s performance is seamless across different architectures and configurations, aligning well with the solutions discussed above.

For more insights on test automation and how Repeato can assist in optimizing your development workflow, visit our blog.

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