Can't compile Firebase Slim Binding release IPA (Undefined symbols for architecture arm64)

[gkmiel-hb]

I can't compile release ipa for iOS MAUI app (.NET8).
Compiler works fine with debug configuration (with Hot Restart enabled and my local device).
Compiler throws these errors for release configuration:

Tool xcrun execution finished (exit code = 1).
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : clang++ exited with code 1:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : Undefined symbols for architecture arm64:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRAnalytics", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRApp", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRAuth", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRAuthResult", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRAuthUser", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : "OBJC_CLASS$_MauiFIRMessaging", referenced from:
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : in registrar.o
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : ld: symbol(s) not found for architecture arm64
C:\Program Files\dotnet\packs\Microsoft.iOS.Sdk.net8.0_18.0\18.0.8316\targets\Xamarin.Shared.Sdk.targets(1648,3): error : clang++: error: linker command failed with exit code 1 (use -v to see invocation)

My environment:
Windows + Visual Studio (Version 17.12.3) + MacinCloud (Mac Mini 2023 M2 16GB RAM
macOS Sonoma XCode 16.2);

Any help would be appreciated.

[gkmiel-hb]

I have found solution to resolve compiling issue. I have set "Reference Output Assembly" property to True on interop library in Sample project dependencies.
After that I have added Firebase.MaciOS.Binding library code to another solution and without success. Compared successful and failed compilation logs. They differ in Firebase.MaciOS.Binding letters case. Original solution has "Macios" letters when project file has "MaciOS". Then I made the same in my solution it has started compile. Maybe some could explain that behavior.

[pjcollins]

@gkmiel-hb I've put up a PR to fix the inconsistencies with the FIrebase.MaciOS.Binding project file naming here #71, though I'm not sure if it's related to the error you're seeing.

Have you managed to get past this issue or are you still running into build errors? If you are still having trouble, would you be able to upload a small project which reproduces the issue, or attach a binlog that contains the build errors you are seeing?

[gkmiel-hb]

@pjcollins I haven't build issue after setting "Reference Output Assembly" property to True on interop library in Sample project dependencies. I don't know why compiling in DEBUG configuration does not need it.

[gkmiel-hb]

My compiled release ipa crashes at first call to native library interop

[gkmiel-hb]

I have succeeded to compile firebase native library, but it needs some changes to interface attributes.
Thanks to @Redth sample https://github.com/Redth/Maui.GoogleMobileAds.iOS
I have added {Protocol] attribute to each interface I had "Undefined symbols for architecture arm64" error. Now it looks like:
` // @interface MauiFIRAnalytics : NSObject

[Protocol]
[BaseType (typeof(NSObject))]
interface MauiFIRAnalytics
{
    // interface methods
}

`
Maybe someone can comment my changes?

[tonyedwardspz]

Yeah. That did it. Thanks @gkmiel-hb 👍

Don't foget to build the interop library itself if anyone has issues after implementing.