Xcode throws 'atomic_notify_one<unsigned long>' is unavailable

Question

I installed Xcode 12 on my Mac, tried building my react native app that runs perfectly on android, and get 'atomic_notify_one<unsigned long>' is unavailable. This is the most information I get from the error.

Answer 1

Instead of commenting out flipper here is a solution that worked for me.

Update flipper in your Podfile to look like this

use_flipper!({ 'Flipper-Folly' => '2.5.3', 'Flipper' => '0.87.0', 'Flipper-RSocket' => '1.3.1' })

Run pod repo update inside the ios folder

And finally, update your project pods using

pod install

Answer 2

This issue happened again today after the iOS simulators were updated to iOS 14.5. The answer posted by "Shared S Katre" seems to be a good work-around.

Because React-Native is open source code, I would think that any big updates on iOS can definitely bring about breaking changes. I imagine those will be fixed later.

Anyways - the issue does seem to be with Flipper, which serves as a debugging tool for RN (https://reactnative.dev/blog/2020/03/26/version-0.62).

If you just need to get your project to build, you can just simply comment out flipper in your podfile, and re-install your pods like so.

Podfile

# Enables Flipper.
#
# Note that if you have use_frameworks! enabled, Flipper will not work and
# you should disable the next line.
# use_flipper!()

Next, re-install your pods. I cd'd into the root of the project and used npx.

$ npx pod-install

Last, try building and running your project:

$ npx react-native run-ios

Update:

Per the comments, looks like this has been fixed now. If you want flipper, you should be able to revert your Podfile and update flipper.

See: https://stackoverflow.com/a/67314652/9906042

Thanks Stackers!

Answer 3

1. Fix Podfile as shown in below image
2. cd ios
3. delete Pods folder and Podfile.lock
4. pod install
5. pod update
6. cd .. && npx react-native run-ios

Answer 4

If someone has still this error (I have just updated Mac, Xcode, etc), you can fix the build without disabling Flipper and Hermes; in your Pod file under post_install just add (I have found it somewhere on the web and changed it to fix new errors with the last updates):

post_install do |installer|
    flipper_post_install(installer)
    react_native_post_install(installer)

    # # to build for the simulator on Apple M1
    # installer.pods_project.targets.each do |target|
    #   target.build_configurations.each do |config|
    #     # disables arm64 builds for the simulator
    #     config.build_settings['EXCLUDED_ARCHS[sdk=iphonesimulator*]'] = 'arm64'
    #   end
    # end

    ## Fix for XCode 12.5 & RN 0.62.2 - See https://github.com/facebook/react-native/issues/28405
    find_and_replace("../node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm",
      "_initializeModules:(NSArray<id<RCTBridgeModule>> *)modules", "_initializeModules:(NSArray<Class> *)modules")

    find_and_replace("../node_modules/react-native/ReactCommon/turbomodule/core/platform/ios/RCTTurboModuleManager.mm",
      "RCTBridgeModuleNameForClass(strongModule))", "RCTBridgeModuleNameForClass(Class(strongModule)))")

    ## Fix for Flipper-Folly on iOS 14.5
    find_and_replace("Pods/Flipper-Folly/folly/synchronization/DistributedMutex-inl.h",
      "atomic_notify_one(state)", "folly::atomic_notify_one(state)")

    find_and_replace("Pods/Headers/Private/RCT-Folly/folly/synchronization/DistributedMutex-inl.h",
      "atomic_notify_one(state)", "folly::atomic_notify_one(state)")

    find_and_replace("Pods/Flipper-Folly/folly/synchronization/DistributedMutex-inl.h",
      "atomic_wait_until(&state, previous | data, deadline)", "folly::atomic_wait_until(&state, previous | data, deadline)")
  end

Before your target, add

# fixes for last Mac updates
def find_and_replace(dir, findstr, replacestr)
  Dir[dir].each do |name|
      text = File.read(name)
      replace = text.gsub(findstr,replacestr)
      if text != replace
          puts "Fix: " + name
          File.open(name, "w") { |file| file.puts replace }
          STDOUT.flush
      end
  end
  Dir[dir + '*/'].each(&method(:find_and_replace))
end

Answer 5

I have to comment all #ifdef FB_SONARKIT_ENABLED in AppDelegate.m, set hermes to false and comment Flipper in Podfile.

After all, delete Pods and Podfile.lock, then pod install