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Duplicate symbol errors with Firebase iOS SDK v5.5.0+ #1832

andwun opened this issue Sep 17, 2018 · 4 comments

Duplicate symbol errors with Firebase iOS SDK v5.5.0+ #1832

andwun opened this issue Sep 17, 2018 · 4 comments


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andwun commented Sep 17, 2018

After upgrading Firebase iOS SDK from v5.4.1 to v5.5.0 or later, duplicate symbol errors make my builds fail:

duplicate symbol _pb_field_iter_next in:
ld: 30 duplicate symbols for architecture x86_64

I'm using Cocoapods to integrate Firebase. use_frameworks! is not used.

From analyzing Podfile.lock, the dependency tree looks like:

  • Firebase/Core
    • FirebaseAnalytics
      • nanopb
      • GoogleAppMeasurement
        • nanopb

... so this seems much like a Firebase-internal problem.

Does this mean use_frameworks! is now required to use the SDK?
If so, it would be helpful to have this mentioned in the docs and release notes.


  • Xcode version: 9.4.1 and 10.0 GM
  • Firebase SDK version: Good: 5.4.1, Bad: 5.5.0
  • Cocoapods version: 1.5.3
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CocoaPods should ensure there is only one version of pb_common.o. I suspect the problem is from cruft in DerivedData between Firebase version updates. Does rm -rf ~/Library/Developer/Xcode/DerivedData help? If you're still stuck, please share the Podfile and Podfile.lock.

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I am also facing the same problem. Removing DerivedData is not helping out. Here is my Pod file

target 'XXX' do
pod 'UIColor+Hex'
pod 'AFNetworking', '> 2.6.3'
pod 'AFNetworkActivityLogger', '
> 2.0'
pod 'Lockbox', '> 2.1.0'
pod 'libextobjc', '
> 0.4'
pod 'Mantle', '1.5.4'
pod 'ReactiveCocoa', '> 2.0'
pod 'RSSwizzle', '
> 0.1.0'
pod 'GoogleTagManager', '3.15.0'
pod 'UrbanAirship-iOS-SDK', '8.6.0'
pod 'TOCropViewController', '2.2'
pod 'UICountingLabel', '~> 1.4.0'
pod 'Fabric', '1.7.2'
pod 'Crashlytics', '3.9.3'
pod 'OptimizelySDKiOS','2.1.0'
pod 'Firebase/Core'

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@Piramanayagamm can you please share your Podfile.lock as well so we can see what versions each pod resolved to? Thanks!

@paulb777 paulb777 added this to the 5.9.0 milestone Sep 20, 2018
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paulb777 commented Sep 20, 2018

We reproduced this yesterday and the fix will be in the upcoming Firebase 5.9.0 release. Internally tracked at b/116139404

Two possible workarounds:

  • Use use_frameworks! in the Podfile
  • Remove -all_load from the Other Linker Flags Build Setting

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