iOS Release Build - Missing Required Architecture x86_64

Steps to reproduce the problem

Everything works fine in debug mode. When I went to edit scheme -> clicked run option -> changed build configuration to Release and unchecked “debug executable”. I then went to Product -> build.

I have downloaded the bitcode thinking maybe that would solve the issue but it did not.

I tried removing my ios/pods and node_modules directories and installing everything fresh to see if that was the issue, it was not.

Expected behavior

I would expect this to build correctly.

Observerd behavior

ld: warning: ignoring file /Users/tom/bitbybit/mobile/node_modules/react-native-webrtc/apple/WebRTC.xcframework/ios-arm64/WebRTC.framework/WebRTC, missing required architecture x86_64 in file /Users/tom/bitbybit/mobile/node_modules/react-native-webrtc/apple/WebRTC.xcframework/ios-arm64/WebRTC.framework/WebRTC (1 slices)

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_RTCMediaConstraints", referenced from:
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule+RTCPeerConnection.o)

  "_OBJC_CLASS_$_RTCDataBuffer", referenced from:
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule+RTCDataChannel.o)

  "_OBJC_CLASS_$_RTCDataChannel", referenced from:
      __OBJC_$_CATEGORY_RTCDataChannel_$_React in libreact-native-webrtc.a(WebRTCModule+RTCDataChannel.o)

  "_OBJC_CLASS_$_RTCMediaStreamTrack", referenced from:
      __OBJC_$_CATEGORY_RTCMediaStreamTrack_$_React in libreact-native-webrtc.a(RTCMediaStreamTrack+React.o)

  "_OBJC_CLASS_$_RTCIceCandidate", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RCTConvert+WebRTC.o)

  "_OBJC_CLASS_$_RTCConfiguration", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RCTConvert+WebRTC.o)

  "_OBJC_CLASS_$_RTCIceServer", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RCTConvert+WebRTC.o)

  "_OBJC_CLASS_$_RTCPeerConnectionFactory", referenced from:
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule.o)

  "_OBJC_CLASS_$_RTCDefaultVideoDecoderFactory", referenced from:
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule.o)

  "_OBJC_CLASS_$_RTCDataChannelConfiguration", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RCTConvert+WebRTC.o)

  "_OBJC_CLASS_$_RTCEAGLVideoView", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RTCVideoViewManager.o)

  "_OBJC_CLASS_$_RTCDefaultVideoEncoderFactory", referenced from:
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule.o)

  "_OBJC_CLASS_$_RTCSessionDescription", referenced from:
      objc-class-ref in libreact-native-webrtc.a(RCTConvert+WebRTC.o)
      objc-class-ref in libreact-native-webrtc.a(WebRTCModule+RTCPeerConnection.o)

  "_OBJC_CLASS_$_RTCPeerConnection", referenced from:
      __OBJC_$_CATEGORY_RTCPeerConnection_$_VideoTrackAdapter in libreact-native-webrtc.a(WebRTCModule+VideoTrackAdapter.o)
      __OBJC_$_CATEGORY_RTCPeerConnection_$_React in libreact-native-webrtc.a(WebRTCModule+RTCPeerConnection.o)

  "_OBJC_CLASS_$_RTCCameraVideoCapturer", referenced from:
      objc-class-ref in libreact-native-webrtc.a(VideoCaptureController.o)

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Platform information

• React Native version: 0.63.2
• Plugin version: 1.87.1
• OS: iOS
• OS version: 14.0

[gla5001]

I actually found a solution. I just had to run the downloadBitcode script as a pre build step ./node_modules/react-native-webrtc/tools/downloadBitcode.sh.

[emndeniz]

This issue is crazy. I am working on it at least 2 days and couldn’t found a proper solution. WebRTC.xcframework contains multiple architecture and when I delete arm64 compilation will success. Somehow when there is an arm64 architecture exist xcode can not compile it for simulator.