Linker command failed with exit code 1 - only with WebRTC dependency

[TomasHubelbauer]

I have created a brand new Swift 3 XCode 8.3.3. single view iOS project, ran pod init and pod install (with no dependencies) and verified the application runs as expected.

I have then added a WebRTC dependency: pod "WebRTC"

The project fails to build with this dependency added, the error is as follows:

Apple Mach-O Linker (ld) Error
  Linker command failed with exit code 1 (use -v to see invocation)

I ran xcodebuild -verbose in the directory of the project and found an error which says ld: framework not found Pods_{projectName}. Everything else in the output seems to be okay, although it should be noted the output is hard to read.

When I remove the WebRTC dependency and run pod install again (ending up with an empty, Pod-enabled project again), the project builds again using XCode, but running xcodebuild -verbose still fails in the project directory and for the same reason - may this have to do with caching?

Is this something I should fix or is this an issue with the dependency itself? This reproduces on a clean Swift 3 project in XCode 8.3.3, so I think this is a problem with the dependency.

[souvickcse]

Just tried it with xcode 8.3.3, it is working fine. Is there any warning message during the pod install? And just to confirm you add use_frameworks! in pod file and you are not opening .xcodeproj.

[TomasHubelbauer]

No errors when installing the WebRTC pod.

Here's the exact steps to reproduce:

• Create a new Xcode 8.3.3 Swift 3 single view iOS application project
• Test run it, deploy it to the phone - all works
• Close Xcode, cd to the directory, run pod init, code Podfile
  • Uncomment platform :io, '9.0' and use_frameworks!
  • Leave pods empty for now
• Open Xcode through the workspace file, verify it builds and runs with the new structure
• Close Xcode and run code Podfile again, add pod "WebRTC"
• Open Xcode through the workspace file, build fails with the error above

When I remove the pod, leaving an empty Podfile again, it works, builds, deploys successfully.

I will upload the repro to GitHub and link it here later today if you are not able to reproduce.

[souvickcse]

Ok I will try to reproduce it tonight(right now I don't have xcode 8.3.3). And yes upload it I will try with it as well.

[souvickcse]

Done all the steps can't able to replicate the issue. I have to disable bitcode though it was giving me error else there is no issue.

[TomasHubelbauer]

Check out my repro repo here, please: https://gitlab.com/TomasHubelbauer/WebRTC-pod-fail/tree/master Please follow the commit history and README.md. I am able to reproduce it 100 %. Attached xcodebuild log file. We can diff ours and see if we find something. Please create a new application called myApp like I did, we should have identical code that way.

[souvickcse]

Did you disable bitcode after pod install?

[TomasHubelbauer]

Sorry I am somewhat new to iOS development and I didn't know what that was (for reference, you go to your project settings, find Build Settings tab, click All and search for Bitcode). I did it now and it helped! Will you accept a PR so I can add it to README.md?

[souvickcse]

It is already there in the ReadME in BOLD. :) And I don't have permission to accept PR.

[TomasHubelbauer]

Updated my PR because this should definitely be linked from the installation section. Also for a noobie the connection from linker errors to bitcode will not be there, so this is worth a callout. Thanks for your help!

[souvickcse]

And one more thing if you go to the error description it will show that bitcode is enable in the project that is why it is creating the issue.

[TomasHubelbauer]

A good point for more experienced developers, but again, a beginner will never make this connection so I believe the README.md file should mention this explicitly.