CocoaPods - Duplicate symbols when app & framework share a dependency - ios

Question

I am writing an iOS app, using CocoaPods 1.6.0 as my dependency manager. My project consists of a iOS app project (myapp-ui), as well as 3 iOS framework projects (myapp-common, myapp-model, and myapp-editor). I'm also leveraging Fabric.io for crash reporting and app metrics. My myapp-ui and myapp-model projects both make use of the Fabric and Crashlytics frameworks. My Pods file looks like this:
platform :ios, '11.0'
workspace 'MyApp.xcworkspace'
project 'myapp-ui/myapp-ui.xcodeproj'
project 'myapp-common/myapp-common.xcodeproj'
project 'myapp-model/myapp-model.xcodeproj'
project 'myapp-editor/myapp-editor.xcodeproj'
target 'myapp-ui' do
use_frameworks!
project 'myapp-ui/myapp-ui.xcodeproj'
# Pods for myapp-ui
pod 'SwiftyBeaver'
pod 'SwifterSwift'
pod 'Fabric'
pod 'Crashlytics'
pod 'KeychainSwift', '~> 13.0'
target 'myapp-uiTests' do
inherit! :search_paths
# Pods for testing
end
end
target 'myapp-common' do
use_frameworks!
project 'myapp-common/myapp-common.xcodeproj'
# Pods for myapp-common
pod 'SwiftyBeaver'
pod 'SwifterSwift'
pod 'KeychainSwift', '~> 13.0'
end
target 'myapp-model' do
use_frameworks!
project 'myapp-model/myapp-model.xcodeproj'
# Pods for myapp-model
pod 'SwiftyBeaver'
pod 'SwifterSwift'
pod 'Fabric'
pod 'Crashlytics'
end
target 'myapp-editor' do
use_frameworks!
project 'myapp-editor/myapp-editor.xcodeproj'
# Pods for myapp-editor
end
The pods install just fine, and my app builds with no issue. However, when I run it I see a large number of errors in the console that look something like this:
objc[62607]: Class CLSInternalReport is implemented in both <SOME LOCATION>/Build/Products/Debug-iphonesimulator/myapp_model.framework/myapp_model (0x11252f960) and <SOME OTHER LOCATION>/myapp-ui.app/myapp-ui (0x10f2831e8). One of the two will be used. Which one is undefined.
objc[62607]: Class Crashlytics is implemented in both <SOME LOCATION>/Products/Debug-iphonesimulator/myapp_model.framework/myapp_model (0x11252f9b0) and <SOME OTHER LOCATION>/myapp-ui.app/myapp-ui (0x10f283238). One of the two will be used. Which one is undefined.
objc[62607]: Class CLSFileManager is implemented in both <SOME LOCATION>/Build/Products/Debug-iphonesimulator/myapp_model.framework/myapp_model (0x11252fa00) and <SOME OTHER LOCATION>/myapp-ui.app/myapp-ui (0x10f283288). One of the two will be used. Which one is undefined.
objc[62607]: Class CLSAlert is implemented in both <SOME LOCATION>/Build/Products/Debug-iphonesimulator/myapp_model.framework/myapp_model (0x11252fa78) and <SOME OTHER LOCATION>/myapp-ui.app/myapp-ui (0x10f283300). One of the two will be used. Which one is undefined.
Is there a way to address these warnings? I've tried removing them from myapp-ui thinking that myapp-ui makes use of myapp-model (and would therefore inherit the dependency) but that didn't work. I'm at a loss as to how to address this. Thoughts?

Answer 1

I was getting the same warnings you're seeing and took me a while to find a fix. Turns out this happens when you have a dependency that comes pre-compiled, like Fabric and Crashlytics. I think it's because they are copied twice.
What I did was to add those pods only to the app target. My Podfile ended up looking somewhat like this
def pods
pod 'CGMath'
...
end
def app
pod 'Crashlytics'
pod 'Fabric'
end
target 'FrameworkTarget' do
pods
end
target 'AppTarget' do
pods
app
end