Xcode returns linker error "library not found for -lFirebaseAuth"

Question

I wanted to test firebase initial app on Unity. I made a build from Unity in macOS and in Xcode project folder, I have runned the pod command successfully.

pod install

After this I opened Xcode project and I clicked to build button. Before this, I was getting framework not found error. I fixed it and now I am getting

ld: warning: directory not found for option '-L/Users/ali/Library/Developer/Xcode/DerivedData/Unity-iPhone-giljorflztrrychfchrkhcfbqtbh/Build/Products/ReleaseForRunning-iphoneos/FirebaseAuth'
ld: warning: directory not found for option '-L/Users/ali/Library/Developer/Xcode/DerivedData/Unity-iPhone-giljorflztrrychfchrkhcfbqtbh/Build/Products/ReleaseForRunning-iphoneos/FirebaseCore'
ld: warning: directory not found for option '-L/Users/aliavci/Library/Developer/Xcode/DerivedData/Unity-iPhone-giljorflztrrychfchrkhcfbqtbh/Build/Products/ReleaseForRunning-iphoneos/GTMSessionFetcher'
ld: warning: directory not found for option '-L/Users/ali/Library/Developer/Xcode/DerivedData/Unity-iPhone-giljorflztrrychfchrkhcfbqtbh/Build/Products/ReleaseForRunning-iphoneos/GoogleToolboxForMac'
ld: warning: directory not found for option '-L/Users/ali/Library/Developer/Xcode/DerivedData/Unity-iPhone-giljorflztrrychfchrkhcfbqtbh/Build/Products/ReleaseForRunning-iphoneos/nanopb'
ld: library not found for -lFirebaseAuth
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I have already added library pathes to library search path. I added some screenshots as attachments.

Solution

I solved the error by opening ".xcworkspace" file, instead of ".xcodeproj" file.

Comments

[えるまる]

Possible duplicate of ld: framework not found after pod install

[andreszs]

Whenever you are using CocoaPods, you must always open the xcworkspace.

[Justin Waite]

Important to set fastlane's gym to use workspace instead of project.