Hi. Maybe this is a stupid question, but I am real...

# multiplatform

[Lukasz Ciastko]

Hi. Maybe this is a stupid question, but I am really confused - how do I set a multiplatform version in my lubrary?
So far I’ve been using:

plugins {
    kotlin("multiplatform")
    kotlin("native.cocoapods")
    kotlin("plugin.serialization") version "1.6.10"
    id("com.android.library")
    id("maven-publish")
}

But now I need to make it explicit to use 1.9.10.
I tried:

plugins {
    kotlin("multiplatform") version "1.9.10"
    kotlin("native.cocoapods")
    kotlin("plugin.serialization") version "1.6.10"
    id("com.android.library")
    id("maven-publish")
}

But this results in an error:

Error resolving plugin [id: 'org.jetbrains.kotlin.multiplatform', version: '1.9.10']
> Plugin request for plugin already on the classpath must not include a version

But I don’t specify the version anywhere else in my code.
How does it figure out which version it’s using and how can I know which that is and how to change it?

[krzysztof]

I’d suspect you have defined KMP version in either root build.gradle or settings.gradle

[krzysztof]

or in root build.gradle, you declare the plugin usage without specified version and it applies the latest one there is (potentially, not sure about it), so then specifying version in sub-module gets you this error

[Lukasz Ciastko]

I am getting the Xcode 15 linker issue which was supposedly fixed in 1.9.10, so I don’t think it does use the latest…
I don’t see a version configured anywhere.

buildscript {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
    }
    dependencies {
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.10")
        classpath("com.android.tools.build:gradle:7.0.4")
    }
}

Would any of these dependencies have any impact on the Multiplatform version?
Sorry, I’m more of an iOS developer, not really good with Gradle.

[krzysztof]

I don’t see KMP plugin in your dependencies - where are those defined?

[Lukasz Ciastko]

This is in my shared folder build.gradle.kts:

import org.jetbrains.kotlin.gradle.plugin.mpp.apple.XCFramework

plugins {
    kotlin("multiplatform")
    kotlin("native.cocoapods")
    kotlin("plugin.serialization") version "1.6.10"
    id("com.android.library")
    id("maven-publish")
}

[krzysztof]

And this is your root build.gradle.kts?
https://kotlinlang.slack.com/archives/C3PQML5NU/p1695986705916549?thread_ts=1695986426.880019&cid=C3PQML5NU

[Lukasz Ciastko]

It looks like adding this in the main build.gradle.kts might work:

plugins {
    kotlin("multiplatform").version("1.9.10").apply(false)
}

I’m not sure because it complains about something else now that has changed .

[Lukasz Ciastko]

@krzysztof it’s not root, it’s in the shared.

[krzysztof]

There's a root (on project's root) build.gradle file where normally the plugins for the rest of modules are set. Setting the kmp plugin with version there will make sure rest of modules are using same version of plugin

[Lukasz Ciastko]

Yeh, i can see it does it like this now. I created a new empty project and it works the way you’re describing. My project was created around 2 years ago and it looks completely different. I might just create a new project and copy over all the code.

[krzysztof]

so in your root’s build.gradle you can set something like:

// <https://youtrack.jetbrains.com/issue/KTIJ-19369>
@Suppress("DSL_SCOPE_VIOLATION")
plugins {
  // other plugins here
  kotlin("multiplatform").version("1.9.10").apply(false)
}

[krzysztof]

few things about this code:
1. The ‘@suppress’ there is to silence issue seen on lower version of Gradle
2. apply(false) to stop applying plugins automatically, unless submodule apply the plugin (not every sub-module require all the plugins)

[krzysztof]

My project was created around 2 years ago

Ah, yeah, probably best to start over and just do copy-over, if not too big effort 😄

[Lukasz Ciastko]

It looks like adding this:

plugins {
    kotlin("multiplatform").version("1.9.10").apply(false)
}

to the top of build.gradle.kts in the shared folder helped.
Anyway, thank you.

[Lukasz Ciastko]

Now I need to deal with all the changes that happened in the last.2 years. 🙂