KotlinJvmOptions useIR option

Question

Starting from 1.3.70 EAP, there is a new option in

org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions

Which is

var useIR: kotlin.Boolean

And which activates

-Xuse-ir

(see https://github.com/JetBrains/kotlin/commit/383239aff62ad353fa5e9a927003d7973e4565be)

This option seems not described in the documentation. What does it do? What are the implications? I notice a decreased build size (in the KB order tho).

user_2196460 · Answer

This option enables the new implementation of the JVM compiler back-end, the part that generates the bytecode for the JVM, in the Kotlin compiler.

As of Kotlin 1.3.71, it's not production-ready yet, and the flag has been added for internal testing, so please don't use it for any real-life projects just yet.

KotlinJvmOptions useIR option

1 Answers