Xcode 27 incorrectly links a Catalyst binary, _UIFontTextStyleCallout Expected in AppKit

Question

Created Jun ’26

Replies 10

Boosts 0

Participants 4

I have a personal iOS project that I also compile for macOS with Catalyst. When built with Xcode 26.x, everything is linked correctly. When built with Xcode 27 betas, the following runtime error occurs:

Termination Reason:  Namespace DYLD, Code 4, Symbol missing
Symbol not found: _UIFontTextStyleCallout
Referenced from: <046ED276-F81A-31B4-82FF-6DC82E9041BC> /Applications/Photo Library.app/Contents/MacOS/Photo Library
Expected in:     <298B64F6-9BC0-3BFB-BE72-EBDC2BE0FF19> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit

Any assistance?

Thanks

Answered by DTS Engineer in 895563022

Thanks for filing a bug report. It is still being screened. If possible, please add a small Xcode project that can be use to reproduce the problem to your bug report.

Answer 1

Leo Natan OP

Jun ’26

FB23420382

Answer 2

DTS Engineer OP

Apple

Jun ’26

Recommended

Thanks for filing a bug report. It is still being screened. If possible, please add a small Xcode project that can be use to reproduce the problem to your bug report.

Answer 3

Leo Natan OP

2w

Unfortunately, the issue persists with Xcode 27 beta 3.

Answer 4

DTS Engineer OP

Apple

2w

Thanks for the update. I added a note to your bug report. At this time the bug you filed remains open and under investigation.

Answer 5

Leo Natan OP

2w

Would attaching just the Xcode project (.xcodeproj) + a build log that includes the above error assist?

Answer 6

LeoNatan25 OP

1w

Hi,

Just to update, this seems to be an issue of Xcode 27 on macOS 26. The app launches correctly on macOS 27.0.

Answer 7

DTS Engineer OP

Apple

6d

Hi [@Leo Natan](https://developer.apple.com/forums/profile/Leo Natan). Please try testing your software with iOS 27.0 beta 4.

Answer 8

Leo Natan OP

6d

Thanks for reaching! Unfortunately, I have updated my Mac to Golden Gate beta. This issue only occurred on macOS 26.0 with Xcode 27.0 betas. I am unable to verify.

Answer 9

DTS Engineer OP

Apple

5d

Unfortunately, I have updated my Mac to Golden Gate beta.

Your main work Mac? Well, that’s… courageous (-:

Anyway, if you have some free disk space there’s a really easy way to test this fix: Install macOS 26 in a virtual machine.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 10

Leo Natan OP

3d

🙂 Hi Quinn

My personal machine. I think every personal device is now on 27. Once I figures I can change the version number of Xcode 26 in the Info.plist to fool the OS to let me run it from the icon, I just upgraded. But ended up not needed, as reported above.

Work machine is Tahoe, but I seperate the two lives.

If I have time this weekend, I'll see if I can install a VM and quickly try to build.