isCoreLibraryDesugaringEnabled not works in gradle kotlin dsl / kts

Question

To enable desugaring in our android-library module we must put this in build.gradle:

android {
  compileOptions {
    coreLibraryDesugaringEnabled true
  }
}

But we have all scripts migrated to gradle kotlin dsl, so the problem occurs in build.gradle.kts in all three ways:

android {
    compileOptions {
        isCoreLibraryDesugaringEnabled = true
    }
}

configure<BaseExtension> {
    compileOptions {
        isCoreLibraryDesugaringEnabled = true
    }
}

android {
    if (this is com.android.build.api.dsl.LibraryExtension<*, *, *, *, *, *, *, *, *, *, *>) {
        buildFeatures.viewBinding = true
    }
}

Every time it throws Unresolved reference: isCoreLibraryDesugaringEnabled.

Does anybody have an idea how to fix this?

score 39 · Answer 1 · answered Sep 08 '20 at 13:15

39

If you're using Android Gradle Plugin version >= 4.1, use:

isCoreLibraryDesugaringEnabled = true

For versions before that, use:

coreLibraryDesugaringEnabled = true

answered Sep 08 '20 at 13:15

Saurabh Thorat

18,131
5
53
70

for version 4.0 if you use `coreLibraryDesugaringEnabled = true ` then compiler will say `Unresolved reference: coreLibraryDesugaringEnabled` – Krystian Kaniowski Sep 14 '20 at 07:07

Krystian Kaniowski · Accepted Answer · 2020-09-15T12:07:30.533

2

When I switch to the newer android plugin version (4.1.0-rc02) it theoretically works. IDE says it's bad syntax, but it works during compilation.

if (this is com.android.build.api.dsl.LibraryExtension<*, *, *, *, *>) {
    compileOptions.isCoreLibraryDesugaringEnabled = true
}

However, it's not an ideal solution

----- FINAL SOLUTION -----

Solution is similar to How to exclude (ignore) android build variants in gradle kts

It wasn't work because of missing line in top-level build.gradle.kts this line:

classpath("com.android.tools.build:gradle:4.0.1")

edited Sep 15 '20 at 12:07

answered Sep 08 '20 at 09:19

Krystian Kaniowski

1,959
17
33

Right. for me setting build tools to `4.0.1` and gradle version to `gradle-6.1.1-all.zip` worked. thanks. – omer Nov 18 '21 at 11:27
also I used `coreLib...` instead of `isCoreLib...` due to `4.0.1` and also I had to change kotlin version (due to some other jetifier errors in my case) as well to newer and compatible version. so had to change bunch of things.I am setting up a few months old project so facing these errors. – omer Nov 18 '21 at 11:46

isCoreLibraryDesugaringEnabled not works in gradle kotlin dsl / kts

2 Answers2