Software⏱️ 2 min read📅 2026-05-31

How to Fix: File is universal (three slices), but it does not contain a(n) ARMv7-s slice error for static libraries on iOS, anyway to bypass?

Error message when using universal static libraries on iOS.

Quick Answer: Use the -luniversal_dynamic library flag to link against a universal dynamic library, which can bypass the ARMv7s slice requirement.

The issue you're encountering is due to the universal library file not containing an ARMv7s slice, which is required for static libraries on iOS. This problem can arise when using external static libraries that haven't been updated by their developers yet.

✨ Bypassing the Issue

Method 1: Using a Universal Library

  1. Step 1: Create a universal library with both armv7s and arm64 architectures.

Method 2: Using a Dynamic Library

  1. Step 1: Add the dynamic library to your project's target.

By implementing these methods, you can bypass the universal library file issue and add support for static libraries on iOS even when the developer hasn't updated their library yet.

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