Does not build on xcode 26.4 for iOS

[SamuelBrucksch]

Description

The build fails with

❌  Undefined symbols for architecture arm64
┌─ Symbol: SkFontMgr_New_CoreText(__CTFontCollection const*)
└─ Referenced from: RNSkia::RNSkApplePlatformContext::createFontMgr() in react_native_skia[11](RNSkApplePlatformContext.o)


❌  ld: symbol(s) not found for architecture arm64

With xcode 26.4, fmt 12.1. is needed:
facebook/react-native#56099

Applying these changes, result in the above error.

React Native Skia Version

2.5.3

React Native Version

0.81

Using New Architecture

• Enabled

Steps to Reproduce

Apply the fmt version changes and build the app on iOS.

Snack, Code Example, Screenshot, or Link to Repository

---

[wcandillon]

Can you provide a reproduction? What could be the link between the fmt upgrade and React Native Skia? I happen to use 26.4 as well.

[SamuelBrucksch]

Hey,
it just happened when updating fmt (which is a prerequisite in any react native app anyways, otherwise it immediately fails to build). I don't have any reproduction app yet. As xcode 26.4. was just force installed yesterday evening, did you actually try a new release build with that version? Might be necessary to pod install again. Also you need the fmt 12 version. Will check if i can provide a reproduction, but i guess it should easily be reproducible on every project. We use expo also, maybe that is relevant.

If your project already builds without the fmt error, you might have to try again anyways.

The ios target also needs to be 26.4.

Here is a reproduction of the fmt error:
https://github.com/Brett-Best/rn-fmt-reproducer

So adding this lib in there probably should do the job.

[SamuelBrucksch]

One of my favorite quotes related to apple:

Sorry for taking your time.

[wcandillon]

Please don't apologize, flagging facebook/react-native#56099 to me already saved me a lot of time this morning :)