KMP Build Setup (Gradle)

Overview

The Kotlin Multiplatform Gradle plugin's kotlin {} block declares targets; from the declared targets it generates a source-set hierarchy (commonMain → intermediate iosMain → leaf iosArm64Main) via the default hierarchy template. Shared code lives in commonMain, platform code in the platform source sets. Requires Kotlin 1.9.20+ (hierarchy template); current line is Kotlin 2.1.x.

When to use

• New or broken shared/build.gradle.kts
• Adding a target (iosArm64, jvm, js, wasmJs) or a source set
• "source set not found" or dependency-wiring issues across commonMain/iosMain
• Configuring the android {} block for androidTarget

Plugins + targets