Resolving “Undefined Symbols for Architecture x86_64” in Xcode

Resolving "Undefined Symbols for Architecture x86_64" in Xcode

28 February 2025 Stephan Petzl Leave a comment Xcode

Encountering the “Undefined symbols for architecture x86_64” error in Xcode can be frustrating, especially for beginners. This guide will walk you through the most effective solutions, drawing from practical examples and expert advice.

Understanding the Error

This error typically indicates a problem with linking, where the compiler cannot locate certain symbols or classes needed for your project. The issue often arises due to missing frameworks or incorrect project settings.

Step-by-Step Solutions

1. Add Missing Frameworks

In many cases, the error is due to a missing framework. Follow these steps to add the necessary framework:

  • Open your project in Xcode.
  • Click on your project name in the upper left of the navigator pane.
  • In the middle pane, select the Build Phases tab.
  • Under Link Binary With Libraries, click the plus button.
  • Select the IOBluetooth.framework from the list and click Add.

This ensures that the framework definitions are accessible to the linker.

2. Check Architecture Settings

Ensure your project is set to use compatible architectures. Sometimes, libraries may not support newer architectures such as x86_64. You can adjust this by:

  • Going to your project’s Build Settings.
  • Under Architectures, adjust the settings to match your target device or simulator.

3. Clean and Rebuild the Project

A corrupted build cache can also lead to this error. To resolve this, try cleaning and rebuilding your project:

  • Select Product > Clean Build Folder from the menu.
  • Rebuild your project to see if the error persists.

4. Verify Source and Target Membership

Ensure that all necessary files are included in your target:

  • Navigate to Build Phases.
  • Check that all relevant source files are listed under Compile Sources.

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