Hey all, I’ve tried to create a library project which depends on firebase-kotlin-sdk and when build...

# multiplatform

[Harri Hohteri]

Hey all,

I’ve tried to create a library project which depends on firebase-kotlin-sdk and when building klib gradlew :shared:build it failed because of

> Task :shared:linkPodReleaseFrameworkIosArm64 FAILED
e: Compilation failed: Linking globals named 'kniprot_cocoapods_FirebaseAuth0_FIRUserInfo': symbol multiply defined!

 * Source files: 
 * Compiler version: 2.1.21-RC
 * Output kind: FRAMEWORK

e: java.lang.Error: Linking globals named 'kniprot_cocoapods_FirebaseAuth0_FIRUserInfo': symbol multiply defined!

I got it fixed by defining the following into cocoapods block:

cocoapods {
        version = "10"
        ios.deploymentTarget = libs.versions.ios.deploymentTarget.get()
        framework {
            baseName = "FirebaseFirestoreXXX"
            isStatic = !enableFirebasePodsForTests
        }

Ie. added isStatic whenever not running tests from Android Studio and renaming baseName to something else than `FirebaseFirestore`as I copied the configuration from the firebase-kotlin-sdk project.

This fixed it yesterday but today for whatever reason I’m back to the same error about symbol multiply defined. Any pointers would be helpful.

Running tests from Android Studio work fine. I can build an XCFramework fine, but klib fails again.

Any help would be appreciated, thanks.

[Andrey Yastrebov]

Hi, can you provide a minimal reproducer project?

[Harri Hohteri]

Hi, I made a minimal sample (attached), it had the same issue but when I removed the below dependency to FirebaseAuth, it compiles fine:

pod("FirebaseAuth") {
    linkOnly = enableFirebasePodsForTests
    version = libs.versions.firebase.cocoapods.get()
    extraOpts += listOf("-compiler-option", "-fmodules")
}

minimal_sample.zip

[Andrey Yastrebov]

So, your primary goal is to create an xcframework with firebase-kotlin-sdk?

[Harri Hohteri]

Eventually but not in this library (I forgot the XCFramework part there, it works). I want to create klib so I can import it to another KMP library but the compilation fails if I have FirebaseAuth included as a dependency which is required by some tests

[Andrey Yastrebov]

You need to run tests in the lib? Which tests?

[Harri Hohteri]

We wrap firestore into a persistence service and test against the firebase emulator that our wrapper functions work along with document to object mapping

[Andrey Yastrebov]

I would recommend to use the following approach:

1. Libaray "A", which have a dependency on firebase-kotlin-sdk. No cocoapods or xcframeworks here
2. Consumer project "B", consumes the library "A", adds a cocoapods dependency on native ios Firebase libs.
Then you should be able to run tests from B

[Harri Hohteri]

Ah, you are correct that it compiles the klib without cocoapods altogether, didn’t realize that. Thanks! We can include them only for the tests when needed.