After upgrading to flutter latest version 3.7 and doing all packages upgrade. I am not able to build my project for iOS, for android its working fine.
Error Log
Swift Compiler Error (Xcode): Include of non-modular header inside framework module 'GTMSessionFetcher.GTMSessionFetcherLogging':
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcherLogging.h:15:8
Swift Compiler Error (Xcode): Duplicate interface definition for class 'GTMSessionFetcherUserDefaultsFactory'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:419:0
Swift Compiler Error (Xcode): Redefinition of 'GTMSessionFetcherError'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:429:27
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorDownloadFailed'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:430:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorUploadChunkUnavailable'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:431:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorBackgroundExpiration'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:432:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorBackgroundFetchFailed'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:433:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorInsecureRequest'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:434:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorTaskCreationFailed'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:435:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherErrorUserCancelled'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:439:2
Swift Compiler Error (Xcode): Redefinition of 'GTMSessionFetcherStatus'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:442:27
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherStatusNotModified'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:444:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherStatusBadRequest'
/ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:445:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherStatusUnauthorized'
ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:446:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherStatusForbidden'
ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:447:2
Swift Compiler Error (Xcode): Redefinition of enumerator 'GTMSessionFetcherStatusPreconditionFailed'
ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:448:2
Swift Compiler Error (Xcode): Reference to 'GTMSessionFetcherServiceProtocol' is ambiguous
Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:676:37
Swift Compiler Error (Xcode): Unknown class name 'GTMSessionFetcherServiceProtocol'; did you mean 'GTMSessionFetcherService'?
Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:676:37
Swift Compiler Error (Xcode): Type argument 'GTMSessionFetcherService' must be a pointer (requires a '*')
ios/Pods/GTMSessionFetcher/Sources/Core/Public/GTMSessionFetcher/GTMSessionFetcher.h:676:37
Swift Compiler Error (Xcode): Too many errors emitted, stopping now
Swift Compiler Error (Xcode): Could not build Objective-C module 'GTMSessionFetcher'
I tried all solutions -
the latest version of the library installed.
all the necessary dependencies are installed and up-to-date.
Clean the build folder and then build the project again.
updating your pods and running 'pod install'.
deleting the derived data folder and build again.
Finally got the solution to it
For me a xcode setting got changed while updating (i suppose)
The errors are caused by changing the User Header Search Paths to: Pods/** (recursive)
To remove the error we just need to delete it. So,
Go to General > Build Settings > Search User Header Search Paths > Delete Pods/**
Do flutter clean
Do flutter build ios
Now You error should be gone
Special Thanks and references to these links
https://github.com/firebase/firebase-ios-sdk/issues/10726 https://github.com/lsamaria/GTMSessionFetcherIssue