Fix unrelated tasks being configured at execution time, KT-31666

Replace iteration over all tasks with `.matching { ... }` with `
.configureEach { if (...) ... }`, so that the check iterates
just over those tasks which are triggered to configure from
somewhere else.

Issue #KT-31666 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ConfigurationAvoidanceIT.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle
+
+import org.junit.Test
+
+class ConfigurationAvoidanceIT : BaseGradleIT() {
+
+    @Test
+    fun testUnrelatedTaskNotConfigured() = with(Project("simpleProject", GradleVersionRequired.AtLeast("4.10.2"))) {
+        setupWorkingDir()
+
+        val expensivelyConfiguredTaskName = "expensivelyConfiguredTask"
+        val triggeredExpensiveConfigurationText = "Triggered expensive configuration!"
+
+        gradleBuildScript().appendText("\n" + """
+            tasks.register("$expensivelyConfiguredTaskName") {
+                println("$triggeredExpensiveConfigurationText")
+            }
+        """.trimIndent())
+
+        build("compileKotlin") {
+            assertSuccessful()
+            assertNotContains(triggeredExpensiveConfigurationText)
+        }
+    }
+
+}

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.gradle.tasks
 
 import org.gradle.api.Project
+import org.gradle.api.Task
 import org.gradle.api.file.FileCollection
 import org.gradle.api.plugins.BasePluginConvention
 import org.gradle.api.tasks.*
@@ -33,6 +34,7 @@ import org.jetbrains.kotlin.gradle.plugin.KotlinMultiplatformPluginWrapper
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformPluginBase
 import org.jetbrains.kotlin.gradle.plugin.PLUGIN_CLASSPATH_CONFIGURATION_NAME
 import org.jetbrains.kotlin.gradle.report.BuildReportMode
+import org.jetbrains.kotlin.gradle.utils.isGradleVersionAtLeast
 import org.jetbrains.kotlin.gradle.utils.isParentOf
 import org.jetbrains.kotlin.gradle.utils.pathsAsStringRelativeTo
 import org.jetbrains.kotlin.gradle.utils.toSortedPathsArray
@@ -459,14 +461,27 @@ open class KotlinCompile : AbstractKotlinCompile<K2JVMCompilerArguments>(), Kotl
     private fun disableMultiModuleIC(): Boolean {
         if (!incremental || javaOutputDir == null) return false
 
-        val illegalTask = project.tasks.matching {
-            it is AbstractCompile &&
-                    it !is JavaCompile &&
-                    it !is AbstractKotlinCompile<*> &&
-                    javaOutputDir!!.isParentOf(it.destinationDir)
-        }.firstOrNull() as? AbstractCompile
+        fun forEachTask(fn: (Task) -> Unit) {
+            if (isGradleVersionAtLeast(4, 10)) {
+                project.tasks.configureEach(fn)
+            } else {
+                project.tasks.forEach(fn)
+            }
+        }
 
-        if (illegalTask != null) {
+        var illegalTaskOrNull: AbstractCompile? = null
+
+        forEachTask {
+            if (it is AbstractCompile &&
+                it !is JavaCompile &&
+                it !is AbstractKotlinCompile<*> &&
+                javaOutputDir!!.isParentOf(it.destinationDir)
+            ) {
+                illegalTaskOrNull = illegalTaskOrNull ?: it
+            }
+        }
+
+        illegalTaskOrNull?.let { illegalTask ->
             logger.info(
                 "Kotlin inter-project IC is disabled: " +
                         "unknown task '$illegalTask' destination dir ${illegalTask.destinationDir} " +