The

use-experimental

compiler argument either does not work as advertised (has a bug) or is not configured properly. Whats the correct way to configure the

use-experimental

compiler argument with gradle (kotlin dsl) such that I do not get warnings for using experimental APIs in my code? Right now I have this

subprojects {

  // ... 

  project.tasks.withType<KotlinCompile> {
    kotlinOptions {
      freeCompilerArgs = listOf(
        "-Xuse-experimental=kotlin.Experimental,kotlinx.coroutines.ExperimentalCoroutinesApi,kotlinx.serialization.ImplicitReflectionSerializer"
      )
    }
  }
}

in my root build gradle file but I still get warnings like in the attached image (both

Flow

and

fun dispatcher.invoke( ... )

are experimental APIs)

#gradle?

Will x-post

Have you refreshed project from Gradle after these changes?

Yes.

Both should be fine. Can you check which arguments are shown in the Kotlin facet of your module in the project structure?

Ah I forgot to add, I am using AS 3.6 canary and gradle kotlin dsl so extra information does not show up in project structure.

Could it be that a specific KotlinCompile task overrides

freeCompilerArgs

with another list?

I dont think so. I define the

freeCompilerArgs

in one location only; within

subprojects

block of the root build file. I have also tried wrapping in

project.afterEvaluate { ... }

with no luck

Then it's most likely related to importing these options into IDE, but it's hard to tell at this point what is wrong. Could you file an issue with details (and better with the build scripts to reproduce the problem) here https://kotl.in/issue?

Also confirmed, both syntaxes work for gradle build but IDE has warnings.