Hello! I have this error after compiling KMP library with cocoapods ```There is a library attached ...

# multiplatform

[Nikita Khlebushkin]

Hello! I have this error after compiling KMP library with cocoapods

There is a library attached to the project that was compiled with an older Kotlin/Native compiler and can't be read in IDE:
			"analytics-cinterop-Analytics.klib" at $project/analytics/build/classes/kotlin/iosX64/main/analytics-cinterop-Analytics.klib
			Please edit Gradle buildfile(s) to use Kotlin Gradle plugin version 1.3.61. Then rebuild the project and re-import it in IDE.

The only place that I apply multiplatform plugin has
kotlin("multiplatform") version "1.3.61"
How can I fix it?

[Artyom Degtyarev [JB]]

You’re getting this in the IDEA right? Please check its Kotlin plugin version. Is it also 1.3.61-<something>?

[Nikita Khlebushkin]

@Artyom Degtyarev [JB] 1.3.61-release-IJ2019.3-1

[Artyom Degtyarev [JB]]

Maybe one can avoid it by invalidating caches ofc, but if it won’t help, maybe it would make sense to check klib manually.
To do it, use 'klib' tool from the ~/.konan/kotlin-native-macos-1.3.61/bin/ directory
If klibs contents will show correct symbols, then the problem is just IDE plugin.
Is it working correctly btw? I mean compilation etc.

[Nikita Khlebushkin]

The compilation works just fine, the output framework is successfully used in 33% cases (one machine out of three, the rest give the attached error)

[Nikita Khlebushkin]

Restart resolved my problem until the next build

[Nikita Khlebushkin]

klib contents showed me the content of my library that I exported via Cocoapods

[Artyom Degtyarev [JB]]

Ok. At least it means klib itself should be valid.
Can you clarify a bit, when you face the error, and when you’re getting this SwiftLint things?

[Nikita Khlebushkin]

This error pops up in Intellij Idea after I build a project from Xcode (far from every time though)

[Nikita Khlebushkin]

The error about incorrect K/N version, i mean

[Nikita Khlebushkin]

The error with crosses all over stacktrace pops up when an iOS project is built on the other machine using the compiled library as dependency via cocoapods

[Nikita Khlebushkin]

Exactly same project on the same machine that was used to compile the framework works fine

[Nikita Khlebushkin]

The framework is wrapped into cocoapods and is retrieved from private repo via

use_modular_headers!


source <mailto:'[e-mail]|'[e-mail]>:%COMPANY%/%COMPANY%cocoapods.git'
source '<https://github.com/CocoaPods/Specs.git>'

target 'Demo' do
    pod 'ProjectAnalytics', '~> 0.1.0'
end

[Nikita Khlebushkin]

import analytics is where the framework is being imported into the iOS project

[Nikita Khlebushkin]

And is where the error happens

[Nikita Khlebushkin]

Exactly same iOS project with exactly same Podfile runs flawlessly on the first machine

[Nikita Khlebushkin]

And my theory was that the error about Kotlin Gradle plugin version can be the cause of it

[Artyom Degtyarev [JB]]

Ah, I think I understand what’s the problem here. In it’s current state, CocoaPods plugin generates dummy framework on the ./gradlew podspec task execution, to avoid some problems with static/dynamic frameworks. vendored_framework= parameter in the Xcode build process. For the actual build, on some stage the plugin compiles the real framework instead of dummy one, and everything goes fine. In your case, it seems like some part of this fragile pipeline was broke.

[Artyom Degtyarev [JB]]

There was a discussion on CocoaPods plugin use for the remote repositories, see here https://kotlinlang.slack.com/archives/C9JM6Q2UX/p1580468907017200

[Nikita Khlebushkin]

Thanks! So, if I understood correctly, the first option can solve my problem here?

[Artyom Degtyarev [JB]]

Yes, sorry for a long delay. Distributing final framework as a file seems to be an optimal solution here.

[Nikita Khlebushkin]

Thank you! I have found a solution that works on my limited set of tests: I'm building Xcode project for three archs (arm64, arm32, X64); three frameworks are generated; I'm merging %module_name% files from them with lipo and put it back into one of frameworks. Finally, I edit Info.plist to mark supported platforms (IPhoneOS, IPhoneSimulator), and add this framework to an empty Cocoapod as dependency. Now, when I include this empty Cocoapod into Xcode project, I am able to build with my framework.

It's a lot of manual processes, but as long as it works...

[Artyom Degtyarev [JB]]

Just a small addition - we got some FatFrameworkTask in the Gradle plugin, maybe it could cut you some time on this lipo manipulations.

[Nikita Khlebushkin]

Thanks, even better that I thought!