Set Main-Class attr for KMP 1.9.0 or above (#1410)

https://github.com/JetBrains/kotlin/releases/tag/v1.9.0
JetBrains/kotlin@e0389a0
https://youtrack.jetbrains.com/issue/KT-58661

Author: Goooler

docs/changes/README.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased](https://github.com/GradleUp/shadow/compare/9.0.0-beta12...HEAD) - 2025-xx-xx
 
+**Changed**
+
+- Set `Main-Class` attr for KMP 1.9.0 or above. ([#1410](https://github.com/GradleUp/shadow/pull/1410))
+
 **Fixed**
 
 - Avoid creating jvm targets eagerly for KMP. ([#1378](https://github.com/GradleUp/shadow/pull/1378))

docs/kotlin-plugins/README.md

@@ -83,7 +83,7 @@ automatically configure additional tasks for bundling the shadowed JAR for its `
     kotlin {
       @Suppress("OPT_IN_USAGE")
       jvm().mainRun {
-        // Optionally, set the main class for `runJvm`, it's available from Kotlin 2.1.0
+        // Optionally, set the main class for `runJvm`.
         mainClass = "myapp.MainKt"
       }
       sourceSets {
@@ -121,7 +121,7 @@ automatically configure additional tasks for bundling the shadowed JAR for its `
 
     kotlin {
       jvm().mainRun {
-        // Optionally, set the main class for `runJvm`, it's available from Kotlin 2.1.0
+        // Optionally, set the main class for `runJvm`.
         it.mainClass.set('myapp.MainKt')
       }
       sourceSets {

src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/ShadowKmpPlugin.kt

@@ -30,7 +30,7 @@ public abstract class ShadowKmpPlugin : Plugin<Project> {
         },
       )
 
-      if (!isAtLeastKgpVersion(2, 1, 0)) return@registerShadowJarCommon
+      if (!isAtLeastKgpVersion(1, 9, 0)) return@registerShadowJarCommon
 
       @OptIn(ExperimentalKotlinGradlePluginApi::class)
       target.mainRun {