[Gradle] Read system properties at configuration time using Gradle providers

The change is a step to fully support Gradle configuration cache.
Relates to #KT-43605
Relates to #KT-44611

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

@@ -24,6 +24,7 @@ import org.gradle.api.internal.FeaturePreviews
 import org.gradle.api.logging.Logger
 import org.gradle.api.logging.Logging
 import org.gradle.tooling.provider.model.ToolingModelBuilderRegistry
+import org.jetbrains.kotlin.cli.common.CompilerSystemProperties
 import org.jetbrains.kotlin.gradle.dsl.*
 import org.jetbrains.kotlin.gradle.logging.kotlinDebug
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMetadataTarget
@@ -76,9 +77,6 @@ abstract class KotlinBasePluginWrapper : Plugin<Project> {
             it.add(project.dependencies.create("$KOTLIN_MODULE_GROUP:$KOTLIN_KLIB_COMMONIZER_EMBEDDABLE:$kotlinPluginVersion"))
         }
 
-        // TODO: consider only set if if daemon or parallel compilation are enabled, though this way it should be safe too
-        System.setProperty(org.jetbrains.kotlin.cli.common.KOTLIN_COMPILER_ENVIRONMENT_KEEPALIVE_PROPERTY, "true")
-
         val kotlinGradleBuildServices = KotlinGradleBuildServices.getInstance(project, listenerRegistryHolder)
 
         kotlinGradleBuildServices.detectKotlinPluginLoadedInMultipleProjects(project, kotlinPluginVersion)

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

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.build.report.metrics.BuildMetricsReporter
 import org.jetbrains.kotlin.build.report.metrics.BuildMetricsReporterImpl
 import org.jetbrains.kotlin.build.report.metrics.BuildTime
 import org.jetbrains.kotlin.build.report.metrics.measure
+import org.jetbrains.kotlin.cli.common.CompilerSystemProperties
 import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
 import org.jetbrains.kotlin.cli.common.arguments.CommonToolArguments
 import org.jetbrains.kotlin.cli.common.arguments.K2JSCompilerArguments
@@ -334,6 +335,21 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
 
     @TaskAction
     fun execute(inputs: IncrementalTaskInputs) {
+        CompilerSystemProperties.systemPropertyGetter = {
+            val value = if (it in kotlinDaemonProperties) kotlinDaemonProperties[it] else System.getProperty(it)
+            logger.warn("System property read $it = $value (declared: ${it in kotlinDaemonProperties})")
+            value
+        }
+        CompilerSystemProperties.systemPropertySetter = setter@{ key, value ->
+            val oldValue = kotlinDaemonProperties[key]
+            if (oldValue == value) return@setter oldValue
+            kotlinDaemonProperties[key] = value
+            System.setProperty(key, value)
+            logger.warn("System property set $key = $value (was: $oldValue)")
+            oldValue
+        }
+        CompilerSystemProperties.KOTLIN_COMPILER_ENVIRONMENT_KEEPALIVE_PROPERTY.value = "true"
+
         // If task throws exception, but its outputs are changed during execution,
         // then Gradle forces next build to be non-incremental (see Gradle's DefaultTaskArtifactStateRepository#persistNewOutputs)
         // To prevent this, we backup outputs before incremental build and restore when exception is thrown
@@ -425,6 +441,15 @@ abstract class AbstractKotlinCompile<T : CommonCompilerArguments>() : AbstractKo
         val taskBuildDir = taskBuildDirectory
         return taskBuildDir.walk().any { it != taskBuildDir && it.isFile }
     }
+
+    @get:Internal
+    val kotlinDaemonProperties: MutableMap<String, String?> by lazy {
+        if (isGradleVersionAtLeast(6, 5)) {
+            CompilerSystemProperties.values()
+                .associate { it.property to project.providers.systemProperty(it.property).forUseAtConfigurationTime().orNull }
+                .toMutableMap()
+        } else mutableMapOf()
+    }
 }
 
 open class KotlinCompileArgumentsProvider<T : AbstractKotlinCompile<out CommonCompilerArguments>>(taskProvider: T) {
@@ -686,17 +711,6 @@ open class Kotlin2JsCompile : AbstractKotlinCompile<K2JSCompilerArguments>(), Ko
 
     override fun getSourceRoots() = SourceRoots.KotlinOnly.create(getSource(), sourceFilesExtensions)
 
-    @get:InputFiles
-    @get:Optional
-    @get:PathSensitive(PathSensitivity.RELATIVE)
-    internal val friendDependencies: List<String>
-        get() {
-            val filter = libraryFilter
-            return friendPaths.files.filter {
-                it.exists() && filter(it)
-            }.map { it.absolutePath }
-        }
-
     @Suppress("unused")
     @get:InputFiles
     @get:Optional
@@ -760,6 +774,10 @@ open class Kotlin2JsCompile : AbstractKotlinCompile<K2JSCompilerArguments>(), Ko
                 null
         }
 
+        val friendDependencies: List<String> = friendPaths.files.filter {
+            it.exists() && libraryFilter(it)
+        }.map { it.absolutePath }
+
         args.friendModules = friendDependencies.joinToString(File.pathSeparator)
 
         if (args.sourceMapBaseDirs == null && !args.sourceMapPrefix.isNullOrEmpty()) {