Apple Mach -O Linker (Id) Error?

问题

I am trying to build this xcode workspace which was built from Unity. And after modifying the project a little bit when I getting to the very end of building the project (linking) I get the Apple Mach -O Linker (Id) Error. I can't open the error tab to see what exactly is causing the error. All it says is "Linker command failed with exit code 1 (use -v to see invocation). There are also two Apple Mach -O Linker (Id) Errors which occur but I have no idea how to solve them.

Any help is greatly appreciated!

I can't expand these tabs.. this is all I get told This is the warning tab expanded, the two Apple Mach -O Linker (Id) warnings are the same

回答1:

This problem has different solutions , one of them is to set Enable Bitcode to No . ( I don't know why by default it is Yes )

This problem is a ghost like problem . Clearing Cache , Restarting Xcode , Simulator and MAC ,Ensuring proper linking of Frameworks ,Changing app Architecture or , Sometimes just doing nothing can solve this problem .

回答2:

This issue was connected to "Link Binary With Libraries". I've renamed the target, and there were two .framework files for the Pods. Thus, after removing the outdated one - the issue was solved.

回答3:

If you just installed/ uninstalled a pod you might want to look at this. Here's what worked for me:

First make sure you are opening the .xcworkspace file not the .xcodeproj. But this is probable not what's causing the issue.
Delete the pod that was recently just installed.
In the project directory on Xcode, open the frameworks folder and if the pod which was just removed is still listed there as one recentlyremovedpod.framework, delete it from there also. This step is what made my project compile eventually.

回答4:

Another possible cause is if you rename one of your targets (why did I do that?) and you're using pods. You end up with a version of your old target name in the Frameworks folder in your main project (not the Pods project), like pods_oldtarget_framework which no longer exists.

Just delete the old version (or name your target back to it's original and delete the new one), and you should be good to go.

回答5:

For me it was missing frameworks. Try searching the errors you get on Google and find out which frameworks they're part of, then import them in the Build phases tab.

回答6:

I was having the same issue, and resolved by

installing the latest CocoaPods
then do pod setup

回答7:

For me I had the problem because I was using Xcode 9 (beta), then I open the same project with another Xcode 8.3. To solve the problem for me just Clean then Run again.

回答8:

If building on mac for ios in unity, make sure that in the build settings you disable "Metal Editor Support" under other settings for the ios platform.

回答9:

I used xcode 9.3 and I got this same error. But with 9.2 it works. The error may happen because of incompatibilities between the artifacts produced by the two xcodes. The project that threw the error included a framework built with xcode 9.2