Change KAPT class generation path

Question

I want to instruct my Kotlin annotation processor to change the output directory of the generated classes.

I want from my Gradle build script to change the kapt.kotlin.generated argument. I have tried the following to no avail.

1. Doesn't work, path doesn't change

   kapt { arguments { arg("kapt.kotlin.generated", new File('path')) } }

2. Doesn't work, path doesn't change

   kapt { javacOptions { option("kapt.kotlin.generated", new File('path')) } }

3. Doesn't work, NullPointerException when building

   kapt { javacOptions { option("-Akapt.kotlin.generated", new File('path')) } }

Same results for all three when using a string path instead of a file.

I am at a loss, any help would be appreciated.

Answer 1

Use a different option name:

kapt{
    arguments {
        arg("kapt.kotlin.custom.generated",
                rootProject.file("foobar/build/generated/source/kaptKotlin/main").absolutePath)
    }
}

then retrieve the custom option in your annotation processor and use that as the target