React-native-track-player: Xcode 12 Upgrade - Build Failure

[jspizziri]

Describe the bug
After upgrading to Xcode 12, apps no longer build.

To Reproduce
Steps to reproduce the behavior (reproduced by a fresh installation in a new project):

npx react-native init test --template react-native-template-typescript
cd test
npm install --save react-native-kit/react-native-track-player#dev
npm install --save react-native-swift
react-native link
cd ios && pod install && cd ..
npm start
npm run ios

Environment (please complete the following information):
Run react-native info in your project and share the content.

System:
    OS: macOS 10.15.6
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 824.09 MB / 32.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 14.3.0 - /usr/local/bin/node
    Yarn: Not Found
    npm: 6.14.4 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.9.3 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 14.0, DriverKit 19.0, macOS 10.15, tvOS 14.0, watchOS 7.0
    Android SDK:
      API Levels: 29, 30
      Build Tools: 28.0.3, 29.0.2, 30.0.2
      System Images: android-30 | Google Play Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 4.0 AI-193.6911.18.40.6626763
    Xcode: 12.0/12A7209 - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_265 - /usr/bin/javac
    Python: 2.7.16 - /usr/bin/python
  npmPackages:
    @react-native-community/cli: Not Found
    react: 16.13.1 => 16.13.1
    react-native: 0.63.2 => 0.63.2
  npmGlobalPackages:
    *react-native*: Not Found

What react-native-track-player version are you using?

github:react-native-kit/react-native-track-player#8ae5808340c435b450c71dbe4da5e75101c7b720

Are you testing on a real device or in the simulator? Which OS version are you running?

Simulator. All simulators fail.

Code
Please, share the code that is causing the issue:

See above. This can be reproduced with a fresh install of react-native and react-native-track-player.

[faraznaqvi99]

Undefined symbol: __swift_FORCE_LOAD_$_swiftUniformTypeIdentifiers
Undefined symbol: __swift_FORCE_LOAD_$_swiftCoreMIDI

When I installed updates, I am getting these two errors and the build fails. It was working fine before installing the updates. Metro bundler opens and after sometime the build fails. Xcode v12.0

[idir-s]

+1

[whsmacon]

it's sloppy but create a blank swift file in your project via xcode. It will resolve it.

[jspizziri]

@whsmacon

Bless you.

[rdhox]

@whsmacon Thanks for this solution!
Is this a "real solution" or just a trick and we can expect to have other problems in a near future?

[whsmacon]

@whsmacon Thanks for this solution!
Is this a "real solution" or just a trick and we can expect to have other problems in a near future?

This falls strongly in the "trick" category ... Hopefully the track player authors will work to resolve it.

[moonstruck]

@whsmacon Thanks for this solution!
Is this a "real solution" or just a trick and we can expect to have other problems in a near future?

This is suggested in official docs.

[mikeislearning]

After adding this trick, I can get it up and running on the simulator, but I've found that I'm now unable to deploy the app to the store.
When I try with Fastlane, I get:

[19:51:34]: ▸ 1 error generated.
[19:51:34]: ▸ <unknown>:0: error: failed to emit precompiled header '/path to file/App-Bridging-Header.h'
[19:51:34]: ▸ 3 errors generated.
[19:51:34]: ▸ <unknown>:0: error: generate-pch command failed with exit code 1 (use -v to see invocation)

And if I do it directly in Xcode, is also fails with the error

Failed to emit precompiled header

Anyone find a better workaround?

UPDATE - I went into Xcode and changed the Deployment Target from 10 to 11. That seemed to fix things.