Fix compiler issue with Kotlin 1.9 and Backlinks (#1470)

Author: cmelchior

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ### Fixed
 * Rare corruption causing 'Invalid streaming format cookie'-exception. Typically following compact, convert or copying to a new file. (Issue [#1440](https://github.com/realm/realm-kotlin/issues/1440))
+* Compiler error when using Kotlin 1.9.0 and backlinks. (Issue [#1469](https://github.com/realm/realm-kotlin/issues/1469))
 
 ### Compatibility
 * File format: Generates Realms with file format v23.

buildSrc/src/main/kotlin/Config.kt

@@ -127,7 +127,7 @@ object Versions {
     const val jvmTarget = "1.8"
     // When updating the Kotlin version, also remember to update /examples/min-android-sample/build.gradle.kts
     const val kotlin = "1.8.21" // https://github.com/JetBrains/kotlin and https://kotlinlang.org/docs/releases.html#release-details
-    const val latestKotlin = "1.9.0-Beta" // https://kotlinlang.org/docs/eap.html#build-details
+    const val latestKotlin = "1.9.0" // https://kotlinlang.org/docs/eap.html#build-details
     const val kotlinCompileTesting = "1.5.0" // https://github.com/tschuchortdev/kotlin-compile-testing
     const val ktlint = "0.45.2" // https://github.com/pinterest/ktlint
     const val ktor = "2.1.2" // https://github.com/ktorio/ktor

examples/kmm-sample/gradle.properties

@@ -24,3 +24,4 @@ kotlin.mpp.enableGranularSourceSetsMetadata=true
 kotlin.native.enableDependencyPropagation=false
 
 kotlin.mpp.stability.nowarn=true
+kotlin.mpp.androidSourceSetLayoutVersion1.nowarn=true

examples/kmm-sample/shared/src/commonMain/kotlin/io/realm/example/kmmsample/AllTypes.kt

@@ -17,6 +17,7 @@
 
 package io.realm.example.kmmsample
 
+import io.realm.kotlin.ext.backlinks
 import io.realm.kotlin.ext.realmListOf
 import io.realm.kotlin.types.ObjectId
 import io.realm.kotlin.types.RealmInstant
@@ -83,4 +84,7 @@ class AllTypes : RealmObject {
     var objectIdRealmList: RealmList<ObjectId> = realmListOf(ObjectId.create())
     var objectIdRealmListNullable: RealmList<ObjectId?> = realmListOf(null)
     var objectRealmList: RealmList<AllTypes> = realmListOf()
+
+    // Special types
+    val parent by backlinks(AllTypes::objectField)
 }

packages/plugin-compiler/build.gradle.kts

@@ -44,7 +44,7 @@ dependencies {
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
     kotlinOptions {
         jvmTarget = "${Versions.jvmTarget}"
-        freeCompilerArgs = listOf("-Xjvm-default=enable")
+        freeCompilerArgs = listOf("-Xjvm-default=all-compatibility")
     }
 }
 

packages/plugin-compiler/src/main/kotlin/io/realm/kotlin/compiler/IrUtils.kt

@@ -587,11 +587,11 @@ fun getBacklinksTargetPropertyType(declaration: IrProperty): IrType? {
 fun getLinkingObjectPropertyName(backingField: IrField): String {
     (backingField.initializer!!.expression as IrCall).let { irCall ->
         val propertyReference = irCall.getValueArgument(0) as IrPropertyReference
-        val targetProperty = propertyReference.symbol.owner
+        val targetProperty: IrProperty = propertyReference.symbol.owner
         return if (targetProperty.hasAnnotation(PERSISTED_NAME_ANNOTATION)) {
             SchemaProperty.getPersistedName(targetProperty)
         } else {
-            propertyReference.referencedName.identifier
+            targetProperty.name.identifier
         }
     }
 }

packages/plugin-compiler/src/test/kotlin/io/realm/kotlin/compiler/GenerationExtensionTest.kt

@@ -402,7 +402,7 @@ class GenerationExtensionTest {
             componentRegistrars = plugins
             inheritClassPath = true
             kotlincArguments = listOf(
-                "-Xjvm-default=enable",
+                "-Xjvm-default=all-compatibility",
                 "-Xdump-directory=${inputs.outputDir()}",
                 "-Xphases-to-dump-after=ValidateIrBeforeLowering"
             )

packages/test-base/src/jvmMain/kotlin/io/realm/kotlin/test/util/Compiler.kt

@@ -34,6 +34,6 @@ object Compiler {
             messageOutputStream = System.out
             componentRegistrars = plugins
             inheritClassPath = true
-            kotlincArguments = listOf("-Xjvm-default=enable")
+            kotlincArguments = listOf("-Xjvm-default=all-compatibility")
         }.compile()
 }