Generate JvmTarget Gradle DSL object

This is generated based on JvmTarget compiler type without exposing
compiler internals.

^KT-27301 In Progress

generators/tests/org/jetbrains/kotlin/generators/arguments/GenerateGradleOptions.kt

@@ -34,6 +34,7 @@ fun generateKotlinGradleOptions(withPrinterToFile: (targetFile: File, Printer.()
 
     // specific Gradle types from internal compiler types
     generateKotlinVersion(apiSrcDir, withPrinterToFile)
+    generateJvmTarget(apiSrcDir, withPrinterToFile)
 
     // common interface
     val commonInterfaceFqName = FqName("org.jetbrains.kotlin.gradle.dsl.KotlinCommonToolOptions")

generators/tests/org/jetbrains/kotlin/generators/arguments/jvmTargetGenerator.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.generators.arguments
+
+import org.jetbrains.kotlin.config.JvmTarget
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.utils.Printer
+import java.io.File
+
+internal fun generateJvmTarget(
+    apiDir: File,
+    filePrinter: (targetFile: File, Printer.() -> Unit) -> Unit
+) {
+    val jvmTargetFqName = FqName("org.jetbrains.kotlin.gradle.dsl.JvmTarget")
+    filePrinter(file(apiDir, jvmTargetFqName)) {
+        generateDeclaration("enum class", jvmTargetFqName, afterType = "(val target: String)") {
+            val jvmTargetValues = JvmTarget.values()
+            val deprecatedJvmTargetValues = JvmTarget.values().subtract(JvmTarget.supportedValues().toSet())
+
+            val lastIndex = jvmTargetValues.size - 1
+            jvmTargetValues.forEachIndexed { index, jvmTarget ->
+                val lastChar = if (index == lastIndex) ";" else ","
+                val prefix = if (jvmTarget in deprecatedJvmTargetValues) {
+                    "@Deprecated(\"Will be removed soon\") "
+                } else {
+                    ""
+                }
+                println("$prefix${jvmTarget.name}(\"${jvmTarget.description}\")$lastChar")
+            }
+
+            println()
+            println("companion object {")
+            withIndent {
+                println("fun fromTarget(target: String): JvmTarget =")
+                println("    JvmTarget.values().firstOrNull { it.target == target }")
+                println("        ?: throw IllegalArgumentException(\"Unknown Kotlin JVM target: ${'$'}target\")")
+            }
+            println("}")
+        }
+    }
+}

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/dsl/JvmTarget.kt

@@ -0,0 +1,25 @@
+// DO NOT EDIT MANUALLY!
+// Generated by org/jetbrains/kotlin/generators/arguments/GenerateGradleOptions.kt
+package org.jetbrains.kotlin.gradle.dsl
+
+@Suppress("DEPRECATION")
+enum class JvmTarget (val target: String) {
+    @Deprecated("Will be removed soon") JVM_1_6("1.6"),
+    JVM_1_8("1.8"),
+    JVM_9("9"),
+    JVM_10("10"),
+    JVM_11("11"),
+    JVM_12("12"),
+    JVM_13("13"),
+    JVM_14("14"),
+    JVM_15("15"),
+    JVM_16("16"),
+    JVM_17("17"),
+    JVM_18("18");
+
+    companion object {
+        fun fromTarget(target: String): JvmTarget =
+            JvmTarget.values().firstOrNull { it.target == target }
+                ?: throw IllegalArgumentException("Unknown Kotlin JVM target: $target")
+    }
+}