Xcode 16.4 iOS build errors

[aslkdd]

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• I confirm I have searched the Docs, Codemagic Sample Projects, and GitHub Discussions.
• I confirm the software versions on my local computer match the ones in CI environment (e.g. Xcode version, Gradle version). See here
• I confirm I am able to do a fresh clone of the repository and build the project on my local computer.

Which mobile framework are you using?

Flutter (Dart)

Steps to reproduce

1. Create a Flutter project (or use an existing one).
2. Push the project to GitHub and trigger an iOS build on Codemagic.
3. Select Xcode Latest (16.4) as the build environment.
4. Start the build using the default iOS release configuration.
5. The build fails with a linker error (details in “Actual results”).
6. If I switch to Xcode (Edge) 26.1, the build succeeds, but iOS doesn’t use the expected Google Fonts.

Expected results

The project should successfully build on Xcode Latest (16.4) without linker errors, and iOS should display the correct fonts (Google Fonts), the same way it does on Android and did on iOS builds 3 weeks ago.

Actual results

When building with Xcode Latest (16.4), the iOS build fails with the following errors:

Error (Xcode): Undefined symbol: _swift_coroFrameAlloc
Error (Xcode): Linker command failed with exit code 1 (use -v to see invocation)

When switching to Xcode (Edge) 26.1, the build completes, but all Google Fonts are ignored on iOS and replaced with default system fonts. On Android everything works correctly. The same project was building normally 3 weeks ago.

Build id (optional)

691ac3b2366dd66dc6c16695

[dam-ease]

Hello @aslkdd,
I found a similar issue/error message in the FlutterFlow community page with a suggested solution. Can you please check this out if it's similar to your own case - https://community.flutterflow.io/ask-the-community/post/error-xcode-undefined-symbol-swift-coroframealloc-LaWcFDkPqqnidRS

[aslkdd]

Yes, I’ve already seen that thread (and all the other FlutterFlow discussions about this error). The issue is similar, but there is no actual solution there. I’m also not using the YoutubePlayer widget in my project, and I checked the linked GitHub discussion as well.

To summarize: I found only one "working" workaround - as @saedAlHanash mentioned, the build succeeds on Xcode 26.1. That’s true, but it seems to build incorrectly, because iOS completely ignores my Google Fonts and displays only default system fonts. Android works perfectly, so the issue appears only on iOS builds made with Xcode 26.1.

[aslkdd]

UPD:
The latest Flutter versions in Codemagic and FlutterFlow are different, so matching the Flutter version in Codemagic fixed the font issue. Now everything builds correctly on 26.1, and the Google Fonts display properly.