[Gradle, Native] Override equals and hashCode in KonanTarget

"data objects" is only available since language version 1.9. But we should not use LV 1.9, because it is used in the Gradle build classpath and would be incompatible with Gradle Kotlin runtime.
Then only manually override equals/toString/ works here.

#KT-61657 Fixed


Merge-request: KT-MR-12759
Merged-by: Dmitrii Krasnov <Dmitrii.Krasnov@jetbrains.com>

native/utils/src/org/jetbrains/kotlin/konan/target/KonanTarget.kt

@@ -69,4 +69,19 @@ sealed class KonanTarget(override val name: String, val family: Family, val arch
         val deprecatedTargets = setOf(WATCHOS_X86, IOS_ARM32, LINUX_ARM32_HFP, MINGW_X86, LINUX_MIPS32, LINUX_MIPSEL32, WASM32)
         val toleratedDeprecatedTargets = setOf(LINUX_ARM32_HFP)
     }
+
+    override fun equals(other: Any?): Boolean {
+        return when {
+            this === other -> true
+            other !is KonanTarget -> false
+            else -> this.name == other.name && this.family == other.family && this.architecture == other.architecture
+        }
+    }
+
+    override fun hashCode(): Int {
+        var result = name.hashCode()
+        result = 31 * result + family.hashCode()
+        result = 31 * result + architecture.hashCode()
+        return result
+    }
 }

native/utils/tests/org/jetbrains/kotlin/konan/target/KonanTargetTest.kt

@@ -5,16 +5,41 @@
 
 package org.jetbrains.kotlin.konan.target
 
-import org.junit.Assert.assertEquals
-import org.junit.Test
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.ObjectInputStream
+import java.io.ObjectOutputStream
+import java.nio.file.Path
+
 
 class KonanTargetTest {
     @Test
     fun allPredefinedTargetsRegistered() {
         assertEquals(
-            "Some of predefined KonanTarget instances are not listed in 'KonanTarget.predefinedTargets'",
             KonanTarget::class.sealedSubclasses.mapNotNull { it.objectInstance }.toSet(),
-            KonanTarget.predefinedTargets.values.toSet()
+            KonanTarget.predefinedTargets.values.toSet(),
+            "Some of predefined KonanTarget instances are not listed in 'KonanTarget.predefinedTargets'",
         )
     }
+
+    @DisplayName("Test checks that all KonanTarget objects can be successfully serialized and deserialized")
+    @Test
+    fun checkKonanTargetsSerializationAndDeserialization(@TempDir serializedTargetsDir: Path) {
+        val konanTargetsBeforeSerialization = KonanTarget::class.sealedSubclasses.mapNotNull { it.objectInstance }.toSet()
+
+        val serializedTargetsFile = serializedTargetsDir.resolve("serializedTargets.txt")
+
+        ObjectOutputStream(FileOutputStream(serializedTargetsFile.toFile())).use {
+            it.writeObject(konanTargetsBeforeSerialization)
+        }
+        val konanTargetsAfterDeserialization = ObjectInputStream(FileInputStream(serializedTargetsFile.toFile())).use {
+            it.readObject()
+        }
+
+        assertEquals(konanTargetsBeforeSerialization, konanTargetsAfterDeserialization)
+    }
 }