what's the difference between

tasks.withType<KotlinCompile> {
  kotlinOptions {
    freeCompilerArgs = listOf("-Xjsr305=strict", "-Xallow-any-scripts-in-source-roots")
  }
}

and

kotlin {
  compilerOptions {
    freeCompilerArgs.add("-Xjsr305=strict")
    freeCompilerArgs.add("-Xallow-any-scripts-in-source-roots")
  }
}

or to be more precise why the latter one does not work ?:)

The first one seems to be deprecated now: https://kotlinlang.org/docs/compatibility-guide-18.html#changes-in-compiler-options

he

kotlinOptions

task input and the

kotlinOptions{...}

task DSL are in a support mode and will be deprecated in upcoming releases.

yes

-Xallow-any-scripts-in-source-roots

is respected in the first one

You can

println

what are tasks's

compilerOptions.freeCompilerArgs

in both scenarios and compare them 🙂 They both should work the same way. I can't play with your source code, but maybe you have custom kotlinCompile tasks that are not configured by KGP, maybe the later scenario has some extra arguments in the

freeCompilerArgs

already, which are overwritten in the first scenario (by

freeCompilerArgs = listOf(

)

thanks, you are right. in parent module I had

tasks.withType<KotlinCompile> {
  kotlinOptions {
    freeCompilerArgs = listOf("-Xjsr305=strict")
  }
}

If I may continue here. I have in

tasks.withType<KotlinCompile> {
    kotlinOptions {
      freeCompilerArgs += "-Xjsr305=strict"
      jvmTarget = "17"
    }
  }

in my root build file in

allprojects

block. How can I use

kotlin

there? or how can I achieve globally set compile options that can be fine tuned in subprojects? right now this will apparently override anything I set in subprojects with

kotlin

even when using

+=

hm, something like this may work:

plugins {
    id("org.jetbrains.kotlin.jvm")
}

allprojects {
    kotlin.compilerOptions {
        // common configuration for compiler args
   }
}

that unfortunately did not work, but this looks like it did

tasks.withType<KotlinCompile> {
    compilerOptions {
      freeCompilerArgs.add("-Xjsr305=strict")
      jvmTarget.set(JvmTarget.JVM_17)
    }
  }