Read Gradle build dir in config cache compatible way (#4)

* Read Gradle build dir in config cache compatible way

* Enable Gradle config cache in sample

Author: DSteve595

kotlin-preprocessors/src/main/kotlin/com/utopiarise/kotlin/preprocessors/gradle/PreProcessorPlugin.kt

@@ -44,9 +44,12 @@ open class GenerateDefinitions : DefaultTask() {
     @Input
     val definitionsObjectName = project.objects.property(String::class.java)
 
+    private val buildDirProvider = project.layout.buildDirectory.asFile
+
     @TaskAction
     fun execute() {
-        val output = project.buildDir.resolve("definitions")
+        val buildDir = buildDirProvider.get()
+        val output = buildDir.resolve("definitions")
         output.deleteRecursively()
 
         output.generateDefinitions(definitions.get(), definitionsObjectName.getOrElse(DEFAULT_DEFINITION_CLASS))

samples/gradle.properties

@@ -1 +1,3 @@
+org.gradle.configuration-cache=true
+
 kotlin.code.style=official