[Gradle, MPP] Implement kotlin.mpp.absentAndroidTarget.nowarn flag

^KT-41641 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/KT41641AbsentAndroidTarget.kt

@@ -53,4 +53,37 @@ class KT41641AbsentAndroidTarget : MultiplatformExtensionTest() {
             fail("Expected no warning message to be logged. Received: $it")
         })
     }
+
+    @Test
+    fun `test kotlin-mpp-absentAndroidTarget-nowarn flag`() {
+        project.propertiesExtension["kotlin.mpp.absentAndroidTarget.nowarn"] = "true"
+        project.plugins.apply("kotlin-multiplatform")
+        project.plugins.apply("android-library")
+
+        /* Arbitrary minimal Android setup */
+        val android = project.extensions.getByName("android") as LibraryExtension
+        android.compileSdkVersion(30)
+
+        kotlin.jvm()
+
+        project.runMissingAndroidTargetProjectConfigurationHealthCheck(warningLogger = {
+            fail("Expected no warning message to be logged. Received $it")
+        })
+
+        // Test when nowarn is set to false
+        run {
+            var warningMessage: String? = null
+            project.propertiesExtension["kotlin.mpp.absentAndroidTarget.nowarn"] = "false"
+            project.runMissingAndroidTargetProjectConfigurationHealthCheck(warningLogger = { warningMessage = it })
+            assertNotNull(warningMessage, "Expected warning message to be logged")
+        }
+
+        // Test when nowarn is set to null
+        run {
+            var warningMessage: String? = null
+            project.propertiesExtension["kotlin.mpp.absentAndroidTarget.nowarn"] = null
+            project.runMissingAndroidTargetProjectConfigurationHealthCheck(warningLogger = { warningMessage = it })
+            assertNotNull(warningMessage, "Expected warning message to be logged")
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinMultiplatformProjectConfigurationHealthChecks.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.gradle.plugin
 import org.gradle.api.Project
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
 import org.jetbrains.kotlin.gradle.dsl.kotlinExtension
+import org.jetbrains.kotlin.gradle.plugin.PropertiesProvider.Companion.kotlinPropertiesProvider
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMetadataTarget
 import org.jetbrains.kotlin.gradle.targets.android.findAndroidTarget
 import org.jetbrains.kotlin.gradle.utils.androidPluginIds
@@ -33,6 +34,10 @@ internal fun Project.runMissingKotlinTargetsProjectConfigurationHealthCheck() =
 internal fun Project.runMissingAndroidTargetProjectConfigurationHealthCheck(
     warningLogger: (warningMessage: String) -> Unit = project.logger::warn
 ) = project.runProjectConfigurationHealthCheck check@{
+    if (project.kotlinPropertiesProvider.ignoreAbsentAndroidMultiplatformTarget) {
+        return@check
+    }
+
     val androidPluginId = androidPluginIds
         .firstOrNull { androidPluginId -> plugins.findPlugin(androidPluginId) != null } ?: return@check
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinProperties.kt

@@ -167,6 +167,9 @@ internal class PropertiesProvider private constructor(private val project: Proje
     val ignoreDisabledNativeTargets: Boolean?
         get() = booleanProperty(DisabledNativeTargetsReporter.DISABLE_WARNING_PROPERTY_NAME)
 
+    val ignoreAbsentAndroidMultiplatformTarget: Boolean
+        get() = booleanProperty("kotlin.mpp.absentAndroidTarget.nowarn") ?: false
+
     val ignoreIncorrectNativeDependencies: Boolean?
         get() = booleanProperty(KOTLIN_NATIVE_IGNORE_INCORRECT_DEPENDENCIES)