Hi, is it possible to add `kotlin-gradle-plugin` to `buildSrc`? My idea is to write reusable extensi...

# gradle

[Ivan Đorđević]

Hi, is it possible to add kotlin-gradle-plugin to buildSrc?
My idea is to write reusable extensions of various gradle types to provide usages for multiple KMM modules. But no matter what I've tried it won't work.

1. implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.31") fails with Unable to load class 'com.android.build.gradle.BaseExtension'.
2. ``compileOnly("org.jetbrains.kotlinkotlin gradle plugin1.4.31")` fails latter down the line Caused by: java.lang.ClassNotFoundException: org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
Here's the full build.gradle.kts for `buildSrc`:

repositories {
    gradlePluginPortal()
    google()
    mavenCentral()
}

plugins {
    `kotlin-dsl`
}

dependencies {
    compileOnly("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.31")
}

kotlinDslPluginOptions {
    experimentalWarning.set(false)
}

[Javier]

Yes you can, I use it with implementation. The first error is not related to Kotlin plugin but android gradle plugin.

[Ivan Đorđević]

Thanks!

I managed to get it working like this:

repositories {
    gradlePluginPortal()
    google()
    mavenCentral()
}

plugins {
    `kotlin-dsl`
}


dependencies {
        implementation("com.android.tools.build:gradle:4.1.2")
        implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.31")
}


kotlinDslPluginOptions {
    experimentalWarning.set(false)
}

Not ideal but it works 🙂

[Javier]

Try adding it

"com.android.tools.build:gradle:4.1.3"

[Javier]

Really it is ideal, you need AGP in KMM projects, you can't avoid it

[Javier]

if the project was Multiplatform with no android, then you don't need AGP

[Ivan Đorđević]

I meant more because afaik there's no way to reusably specify target versions in one place, both for buildSrc as well as root build.gradle.kts

[Javier]

What do you mean?

[Javier]

I specify all my versions in only one place 🤔

[Ivan Đorđević]

Would it be possible to do so even for build.gradle.kts of buildSrc ? Can it reference Versions.kt defined in buildSrc/src/Versions.kt at that point?

[Javier]

if you are talking about the buildscript in the root build.gradle.kts, you don't need to add kotlin and Android anymore

[Ivan Đorđević]

No no, I meant the buildscript of buildSrc

[Javier]

There is a trick based on having a buildSrc inside buildSrc

[Javier]

But it is easier to migrate to Gradle 7.0 and version catalogs

[Ivan Đorđević]

Buildsrception 🙂 Oh didn't know about those, thanks!