Fix error in kapt on enum constructors with parameters

Do not skip writing the fictitious 'java/lang/Synthetic' annotation in KAPT
mode, because its absence makes ASM confuse indices of enum constructor
parameters (it cannot figure out that there are two additional parameters, name
and ordinal)

 #KT-12694 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/FunctionCodegen.java

@@ -294,7 +294,7 @@ public class FunctionCodegen {
 
     private void markEnumOrInnerConstructorParameterAsSynthetic(MethodVisitor mv, int i) {
         // IDEA's ClsPsi builder fails to annotate synthetic parameters
-        if (state.getClassBuilderMode() != ClassBuilderMode.FULL) return;
+        if (state.getClassBuilderMode() == ClassBuilderMode.LIGHT_CLASSES) return;
 
         // This is needed to avoid RuntimeInvisibleParameterAnnotations error in javac:
         // see MethodWriter.visitParameterAnnotation()

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/KaptIT.kt

@@ -36,6 +36,22 @@ class KaptIT: BaseGradleIT() {
         }
     }
 
+    @Test
+    fun testEnumConstructor() {
+        val project = Project("kaptEnumConstructor", GRADLE_VERSION)
+
+        project.build("build") {
+            assertSuccessful()
+            assertContains(":compileKotlin")
+            assertContains(":compileJava")
+            assertFileExists("build/tmp/kapt/main/wrappers/annotations.main.txt")
+        }
+
+        project.build("build") {
+            assertSuccessful()
+        }
+    }
+
     @Test
     fun testStubs() {
         val project = Project("kaptStubs", GRADLE_VERSION)

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/kaptEnumConstructor/build.gradle

@@ -0,0 +1,27 @@
+buildscript {
+    ext.kotlin_version = '1.1-SNAPSHOT'
+
+    repositories {
+        maven { url 'file://' + pathToKotlinPlugin }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: "java"
+apply plugin: "kotlin"
+
+repositories {
+    maven { url 'file://' + pathToKotlinPlugin }
+}
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    compile "org.jetbrains.kotlin:annotation-processor-example:$kotlin_version"
+    kapt "org.jetbrains.kotlin:annotation-processor-example:$kotlin_version"
+}
+
+kapt {
+    generateStubs = true
+}

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/kaptEnumConstructor/src/main/java/javaPackage/JavaClass.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package javaPackage;
+
+import example.TestEnum;
+
+public class JavaClass {
+    public void test() {
+        TestEnum t = TestEnum.ENTRY;
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/kaptEnumConstructor/src/main/java/test.kt

@@ -0,0 +1,7 @@
+// See KT-12694 Java class cannot access (Kotlin) enum with String constructor param
+
+package example
+
+enum class TestEnum(val value: String) {
+    ENTRY("");
+}