Rebuild if processing options changed

Author: ting-yuan

gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt

@@ -24,6 +24,7 @@ import org.gradle.api.UnknownTaskException
 import org.gradle.api.artifacts.Configuration
 import org.gradle.api.file.ConfigurableFileCollection
 import org.gradle.api.provider.Provider
+import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.SourceSetOutput
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.api.tasks.compile.JavaCompile
@@ -184,6 +185,11 @@ internal fun findJavaTaskForKotlinCompilation(compilation: KotlinCompilation<*>)
 open class KspTask : KspTaskJ() {
     lateinit var options: List<SubpluginOption>
 
+    @Input
+    open fun getApOptions(): Map<String, String> {
+        return project.extensions.getByType(KspExtension::class.java).apOptions
+    }
+
     init {
         // kotlinc's incremental compilation isn't compatible with symbol processing in a few ways:
         // * It doesn't consider private / internal changes when computing dirty sets.