Apps Built with Xcode 26 Fail to Launch on iOS 12 Devices While the Same Project Works Correctly When Built with Xcode 16

Developer Tools & Services Xcode
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PLATFORM AND VERSION iOS Development environment: Xcode 26.4.1 (17E202) (or Xcode26.3 and Xcode26.5), macOS 26.4.1 (25E253) Run-time configuration: iOS iOS12.5.7

DESCRIPTION OF PROBLEM Applications built with Xcode 26 fail to launch on iOS 12 devices.

The application installs successfully, but terminates immediately after launch. The application does not reach application startup code, including application:didFinishLaunchingWithOptions:.

The same project, source code, build configuration, and deployment target work correctly on the same iOS 12 devices when built using Xcode 16.

This issue appears to be related to binaries generated by Xcode 26 and is reproducible across multiple builds and devices running iOS 12.

We would like to confirm whether iOS 12 is expected to remain supported when building applications with Xcode 26 and whether this behavior is a known issue.

STEPS TO REPRODUCE

  1. Open an existing iOS application project.
  2. Set the deployment target to iOS 12.x.
  3. Build and archive the application using Xcode 26.
  4. Install the application on a physical device running iOS 12.x.
  5. Launch the application.
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Apps Built with Xcode 26 Fail to Launch on iOS 12 Devices While the Same Project Works Correctly When Built with Xcode 16
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