Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_FlipperKitNetworkPlugin" etc. for iOS production

Environment

System:
    OS: macOS 10.15.3
    CPU: (4) x64 Intel(R) Core(TM) i5-6267U CPU @ 2.90GHz
    Memory: 49.42 MB / 8.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 14.2.0 - /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: 1.8.4 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 13.4, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
    Android SDK:
      API Levels: 26, 28, 29
      Build Tools: 26.0.2, 28.0.3, 29.0.1, 29.0.2
      Android NDK: Not Found
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.6010548
    Xcode: 11.4/11E146 - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_212 - /usr/bin/javac
    Python: 2.7.16 - /usr/bin/python
  npmPackages:
    @react-native-community/cli: 3.1.0 => 3.1.0 
    react: 16.13.1 => 16.13.1 
    react-native: 0.63.1 => 0.63.1 
  npmGlobalPackages:
    *react-native*: Not Found

Upgrading version

0.63.2

Description

I upgraded from React Native 0.62.2 to 0.63.1 manually using the upgrade helper, because the automatic helper wasn’t working. The application builds successfully in Debug (Product -> Scheme -> Build Configuration -> Debug), but fails for the Release build configuration with the following error:

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_FlipperKitNetworkPlugin", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_SKIOSNetworkAdapter", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_FlipperKitReactPlugin", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_FKUserDefaultsPlugin", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_FlipperKitLayoutPlugin", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_SKDescriptorMapper", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_FlipperClient", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Reproducible demo

AppDelegate.m.txt Podfile.txt

Attached is my Podfile and AppDelegate.m (added txt so that it would upload to Github). Looking at the upgrade helper, I should mention that I have the following in AppDelegate.m. I also tried commenting out the #ifdef FB_SONARKIT_ENABLED and #endif but it still failed.

#ifdef FB_SONARKIT_ENABLED
#import <FlipperKit/FlipperClient.h>
#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
#import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>
static void InitializeFlipper(UIApplication *application) {
  FlipperClient *client = [FlipperClient sharedClient];
  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
  [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]];
  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
  [client addPlugin:[FlipperKitReactPlugin new]];
  [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
  [client start];
}
#endif

and in didFinishLaunchingWithOptions:

  #ifdef FB_SONARKIT_ENABLED
    InitializeFlipper(application);
  #endif

In the Podfile, the only differences from the sample are the app name, OneSignal extension, and expo unimodules. Thanks for the help in advance!

[curiousdustin]

I had the same errors in my app after upgrading from RN 0.62.2 to 0.63.2.

I was able to get my app to build for release by removing this line from Build Settings > Other C Flags > Release

-DFB_SONARKIT_ENABLED=1

I have no idea if this is a proper way to fix this or not. Can anyone confirm?

[Taylor123]

setting -DFB_SONARKIT_ENABLED=1 shouldn’t be a proper fix for this since Flipper shouldn’t be enabled in release builds. With that said, i’m facing the same issue at the moment, so i’m looking for a better fix