react-native: App crashes with `dyld[38734]: symbol not found in flat namespace '_jump_fcontext'` with `use_frameworks!`

So, I was able to test using Firebase Test Lab and it looks like that older devices are working.

I created PRs also for the supported versions:

• 0.73: https://github.com/facebook/react-native/pull/42227
• 0.72: https://github.com/facebook/react-native/pull/42228
• 0.71: https://github.com/facebook/react-native/pull/42229

@cipolleschi, I tried those steps, and I get the dyld[620]: symbol not found in flat namespace '_jump_fcontext' error only when I run in a physical device. If I target a simulator, everything works fine.

Here’s the requested info, if it helps:

$ xcodebuild -version
Xcode 15.1
Build version 15C65

And the output of react-native info:

$ npx react-native@latest info
info Fetching system and libraries information...
System:
  OS: macOS 14.2
  CPU: (10) arm64 Apple M1 Max
  Memory: 2.28 GB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.10.0
    path: ~/.nvm/versions/node/v20.10.0/bin/node
  Yarn:
    version: 1.22.21
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.2.5
    path: ~/.nvm/versions/node/v20.10.0/bin/npm
  Watchman:
    version: 2023.12.04.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.14.3
    path: /Users/rfontes/.rvm/gems/ruby-3.0.6/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.2
      - iOS 17.2
      - macOS 14.2
      - tvOS 17.2
      - watchOS 10.2
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.1 AI-231.9392.1.2311.11076708
  Xcode:
    version: 15.1/15C65
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 11.0.21
    path: /usr/bin/javac
  Ruby:
    version: 3.0.6
    path: /Users/rfontes/.rvm/rubies/ruby-3.0.6/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.1
    wanted: 0.73.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false

@piraces yes, I’ll work on that this week or next week, worst case scenario. There are a few test that I want to run, to make sure we don’t break React Native for other users, but I’m planning that work! Many thanks for reporting this.

I’m very sad. Xcode 15.2 => everytyhing works. Xcode 15.3 => crashes with the above error.

This is an Xcode regression. I’ll try to:

1. apply the old -Wl -ld_classic flags and see if it fixes.
2. try to reach out to Apple to talk about this.

Hi everyone. I’ve spent a couple of days investigating the issue. I think we should be able to fix the problem by adding this patch to the utils.rb file:

• line 165

              project.build_configurations.each do |config|
                # fix for weak linking
                self.safe_init(config, other_ld_flags_key)
-              if self.is_using_xcode15_or_greater(:xcodebuild_manager => xcodebuild_manager)
+             if self.is_using_xcode15_0(:xcodebuild_manager => xcodebuild_manager)

• line 389

-  def self.is_using_xcode15_or_greater(xcodebuild_manager: Xcodebuild)
+  def self.is_using_xcode15_0(xcodebuild_manager: Xcodebuild)
        xcodebuild_version = xcodebuild_manager.version

        # The output of xcodebuild -version is something like
        # Xcode 15.0
        # or
        # Xcode 14.3.1
        # We want to capture the version digits
        regex = /(\d+)\.(\d+)(?:\.(\d+))?/
        if match_data = xcodebuild_version.match(regex)
            major = match_data[1].to_i
+         minor = match_data[2].to_i     
-          return major >= 15
+          return major == 15 && minor == 0
        end

        return false
    end

With these changes, I was able to run a 0.73 app on the device.

However, the reason why we have to add the -ld_classic flag with Xcode 15 was because Apple reimplemented the linker in Xcode 15 and it was not compatible with versions of iOS < 15.

Now, I cannot install iOS 14.5 on my laptop anymore, because it is not compatible with Sonoma. The last version of macOS that can install and build iOS < 15 is macOS 13.5 IIRC (which is Ventura).

Is there someone that can help out by:

1. Create a new app with 0.73
2. Modify the node_modules/react-native/scripts/cocoapods/utils.rb file applying the patches above
3. Run the app on a simulator/device using iOS < 15 (e.g. 14.5)
4. Report its finding 🙏🙏🙏🙏

The help would be much appreciated and will help the whole community!

Thanks for the reporting. Next week I’ll be back in the office, with a better connection and bandwidth, and I’ll be able to download multiple Xcode and test with/without the flags on multiple system to implement a solution that might work for everyone.

My understanding, as of today is that:

• If you use Xcode < 15 => You don’t need flags, but you can’t target iOS 17
• if you use Xcode >= 15.0.0 && < 15.1.0 => You need the flags, you can target iOS 17
• if you use Xcode >= 15.1 => You don’t need flags, you can target iOS 17

I want to test these hypothesis, but my current connectivity foes not allow me to download 30+ Gb in a day 🤦

I’m really sorry for this as I hoped we fixed this for good. 😦 I’m discussing internally how to move forward, perhaps we can find a fix and backport it to 0.73 as well, but it will take some time…

Hi everyone, I was on a long PTO (3 weeks) and came back this week. I’m looking into this.

Hi there @cipolleschi , I keep getting the error mentioned in the issue when running on a physical device (using the USE_FRAMEWORKS=static workaround).

Using Xcode 15.1:

$ xcodebuild -version
Xcode 15.1
Build version 15C65

The output of react-native info:

$ npx react-native@latest info
info Fetching system and libraries information...
System:
  OS: macOS 14.2.1
  CPU: (12) x64 Intel(R) Core(TM) i7-8700B CPU @ 3.20GHz
  Memory: 1.55 GB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.18.0
    path: /usr/local/bin/node
  Yarn:
    version: 1.22.21
    path: /usr/local/bin/yarn
  npm:
    version: 9.8.1
    path: /usr/local/bin/npm
  Watchman:
    version: 2023.12.04.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.14.3
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.2
      - iOS 17.2
      - macOS 14.2
      - tvOS 17.2
      - watchOS 10.2
  Android SDK:
    API Levels:
      - "33"
      - "34"
    Build Tools:
      - 30.0.3
      - 33.0.0
      - 34.0.0
    System Images:
      - android-33 | Google APIs Intel x86_64 Atom
      - android-34 | Google APIs Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: Not Found
  Xcode:
    version: 15.1/15C65
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.9
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.1
    wanted: 0.73.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false

Any ideas on how to get on this? Thank you!

EDIT: managed to build & run successfully by removing -ld_classic from the Pods project:

Dynamic frameworks are not critical in my app, so let’s get back to the good old static 🐢 🐢

Thanks for looking into this! Got really confused to have the crash back when upgrading to XCode 15.3 🥲

Some good and bad news here.

The good news are that:

1. 0.73 is broken only with Dynamic Frameworks. Static Frameworks and Static Libraries works properly. Previous versions of React Native were not supporting Dynamic Frameworks, so they should not be affected.
2. 0.74 is not affected, it works properly even with Dynamic Frameworks.

The reason why 0.74 is not affected even with Dynamic Frameworks is the following:

1. The root cause for the failure is that Folly/Futures can’t find the symbol _jump_fcontext.
2. The symbol _jump_fcontext is provided by boost, but boost is linked as an empty target in React Native, so, when it compiled to a Dynamic Frameworks, there is no code that the dynamic linker can search for the symbol.
3. 0.74 removed the dependency from Folly/Future, so we are not looking for the symbol anymore.

The bad news is that, even by re-enabling the -ld_classic flag, 0.73 with Dynamic Frameworks is still broken.

@bruno-centanaro @sunzongzheng how critical is the dynamic framework setup for you? Would your app work also with the static framework setup?

No I was only building. I’ll try to connect a device, then.

Are you running it on a device later? Because my issue is not compiling/building but if I run it on a physical device

@cipolleschi, I’ve attempted to target iOS 17 using Xcode 15.1, but I’m encountering the same issue on a real device:

dyld[1495]: symbol not found in flat namespace ‘_jump_fcontext’

@cipolleschi i have the exact same problem. Started a new project npx react-native@latest init AwesomeProjectTest, ran USE_FRAMEWORKS=dynamic NO_FLIPPER=1 pod install

and then i get this

React Native info:

info Fetching system and libraries information...
System:
  OS: macOS 14.2
  CPU: (10) arm64 Apple M1 Max
  Memory: 309.75 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.16.1
    path: ~/.nvm/versions/node/v18.16.1/bin/node
  Yarn:
    version: 1.22.17
    path: /opt/homebrew/bin/yarn
  npm:
    version: 9.5.1
    path: ~/.nvm/versions/node/v18.16.1/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.14.3
    path: /Users/mateioprea/.rvm/gems/ruby-2.7.6/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.2
      - iOS 17.2
      - macOS 14.2
      - tvOS 17.2
      - watchOS 10.2
  Android SDK:
    API Levels:
      - "28"
      - "29"
      - "30"
      - "31"
      - "32"
      - "33"
      - "33"
    Build Tools:
      - 28.0.3
      - 29.0.2
      - 30.0.2
      - 30.0.3
      - 32.0.0
      - 33.0.0
      - 33.0.2
      - 34.0.0
    System Images:
      - android-31 | Google Play ARM 64 v8a
      - android-32 | Google APIs ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: Giraffe 2022.3.1 Patch 2 Giraffe 2022.3.1 Patch 2
  Xcode:
    version: 15.1/15C65
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 20.0.1
    path: /opt/homebrew/opt/openjdk/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/mateioprea/.rvm/rubies/ruby-2.7.6/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.0
    wanted: 0.73.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false