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Update 2.3.0 compatibility guide with advice for registering generated sources #5362

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sarahhaggarty merged 3 commits into from
Feb 12, 2026
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Update 2.3.0 compatibility guide with advice for registering generated sources #5362

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chore: add generated sources change to 2.3.0 compat guide
sarahhaggarty Feb 9, 2026
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Yahor review
sarahhaggarty Feb 11, 2026
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Daniel review
sarahhaggarty Feb 12, 2026
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17 changes: 17 additions & 0 deletions docs/topics/compatibility-guides/compatibility-guide-23.md
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Expand Up @@ -735,6 +735,23 @@ perspective (for example, from Java) is out of the scope of this document.
> - 2.2.20: report a warning
> - 2.3.0: raise the warning to an error

### Change the approach to registering all generated sources

> **Issue**: [KT-45161](https://youtrack.jetbrains.com/issue/KT-45161)
>
> **Component**: Gradle
>
> **Incompatible change type**: source
>
> **Short summary**: Kotlin 2.3.0 introduces a new [Experimental](components-stability.md#stability-levels-explained) API in the [`KotlinSourceSet`](https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-source-set/) interface that lets you [register generated
> sources](gradle-configure-project.md#register-generated-sources) in a Gradle project. Previously, you could use the [`kotlin`](https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-source-set/kotlin.html) property
> to access all generated sources. Starting with Kotlin 2.3.0, if your plugin or build logic needs access to all generated
> sources, use the [`allKotlinSources`](https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-source-set/all-kotlin-sources.html) property instead.
>
> **Migration advice**:
> * To register generated sources, use the [`generatedKotlin`](https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-source-set/generated-kotlin.html) property.
> * To access all sources, including non-generated sources, use the [`allKotlinSources`](https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-source-set/all-kotlin-sources.html) property.

## Build tool removal

### Remove support for Ant
Expand Down