my build.gradle file contains the folowing section...

# gradle

[Łukasz Gendek]

my build.gradle file contains the folowing section:

compileKotlin {
    kotlinOptions {
        jvmTarget = "14"
        allWarningsAsErrors = true
        freeCompilerArgs += [

                "-Xopt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
                "-Xopt-in=kotlin.RequiresOptIn",
                "-Xopt-in=kotlinx.coroutines.ObsoleteCoroutinesApi"]
    }
}

However since kotlin 1.6.0 the -Xopt-in flag shoud be replaced with -opt-in. The problem is that I often switch kotlin version (and then I remove/add the X character). Is there a way to have one gradle file that works for both kotlin 1.5 and kotlin 1.6?

[Vampire]

Add an if to do the right thing for the current kotlin version?

[tapchicoma]

There is a non-official method to get current Kotlin Plugin version - you could use it

[ephemient]

use languageSettings instead

[ephemient]

https://kotlinlang.slack.com/archives/C19FD9681/p1648175677903069?thread_ts=1648164152.673199&cid=C19FD9681

[ephemient]

works the same on every version

[Łukasz Gendek]

sourceSets.main {
languageSettings.optIn("kotlinx.coroutines.ExperimentalCoroutinesApi")
}

No signature of method: org.jetbrains.kotlin.gradle.plugin.sources.DefaultLanguageSettingsBuilder.optIn() is applicable for argument types: (String) values: [kotlinx.coroutines.ExperimentalCoroutinesApi]

[Vampire]

You miss the kotlin. I guess

[Łukasz Gendek]

I've tried kotlin. as well. Still the same error.

[ephemient]

try

kotlin.target.compilations.named("main") {
    languageSettings {
        optIn("...")
        optIn("...")
    }
}

in a JVM-only project

[Łukasz Gendek]

optIn option has been added in kotlin gradle plugin 1.5.30, I'm using 1.5.20, that is why I can't see it

[Łukasz Gendek]

I'm wondering if it is possible/recommended to use kotlin 1.5.20 but kotlin gradle plugin 1.5.30

[ephemient]

use langaugeSettings.optIn instead of freeCompilerArgs. the plugin will do the right thing for that version.

[christophsturm]

revc..

[christophsturm]

oops 🙂