After upgrading project from 1.3.31 (Konan, lipo l...

# multiplatform

[Konstantin Petrukhnov]

After upgrading project from 1.3.31 (Konan, lipo linking) to 1.3.50 (MPP, fatframework task), tests stop working with error:

*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Only one Kotlin framework can be loaded currently'
*** First throw call stack:

Any suggestion how to fix it? App runs fine, only tests are failing. And tests were working before without any problem.

[Konstantin Petrukhnov]

ios app is separate project using cocoapods. If I build only for arm64, it show same error.

[olonho]

Likely your app ends up having two Kotlin frameworks linked in, which is not yet supported.

[Konstantin Petrukhnov]

Only my lib is the kotlin fw in the project. And when I use older version of my lib, tests works. I suspect that there is some differences in fatframework task vs manual lipo.

[Konstantin Petrukhnov]

so with konan, library was dynamically linked. With fat framework it is statically linked. +some bad configuration in our ios project podfile.

[Konstantin Petrukhnov]

@olonho How do I build dynamic one (kotlin mpp)? Are there are some gradle configuration example?

[Kris Wong]

i use a fat framework in my iOS app and it works with no issues

[Artyom Degtyarev [JB]]

So, you were using cocoapods with 1.3.31, and the only difference is in the FatFrameworkTask? If so, you can somehow specify isStatic parameter for every native target with a binary of “framework” type e.g.

kotlin {
    targets.withType<KotlinNativeTarget> {
        binaries.withType<Framework> {
            isStatic = false
        }
    }
}

[Kris Wong]

i am not using cocoapods. the default for a framework target is to be dynamic.

[Kris Wong]

the typical way i see to configure is:

targets {
        configure([ios, iosArm32, iosArm64]) {
            binaries.framework {
                baseName = "$ios_framework_name"
            }
        }
    }

[Konstantin Petrukhnov]

@Artyom Degtyarev [JB] We used 1.3.31 and Konan task and manual lipo linking. Now we using 1.3.50 and MPP structure and FatFramework task.

[Konstantin Petrukhnov]

When i use "file build/fat-framework/MyFw.framework/MyFw", it output:

Mach-O universal binary with 2 architectures: [x86_64:current ar archive random library] [arm64]
(for architecture x86_64):	current ar archive random library
(for architecture arm64):	current ar archive random library

[Konstantin Petrukhnov]

When they linked dynamically, output is:
Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit dynamically linked shared library x86_64] [arm64]
(for architecture x86_64): Mach-O 64-bit dynamically linked shared library x86_64
(for architecture arm64): Mach-O 64-bit dynamically linked shared library arm64

[Artyom Degtyarev [JB]]

Can you share your gradle script? I cannot reproduce this result by myself, but this is not how everything was supposed to work.

[Konstantin Petrukhnov]

@Artyom Degtyarev [JB] https://gist.github.com/petrukhnov/92b9475ce2c8ac6aeb2b8450e9dc268c