Build: add kotlin.build.useIRForLibraries to enable JVM IR for libraries separately

The next step for JVM IR adoption in our project is going to be enabling
`kotlin.build.useIR`, but keeping `kotlin.build.useIRForLibraries`
disabled until we fix all remaining ABI incompatibility issues for
library code.

gradle.properties

@@ -8,7 +8,12 @@ defaultSnapshotVersion=1.4.255-SNAPSHOT
 
 kotlin.compiler.effectSystemEnabled=true
 kotlin.compiler.newInferenceEnabled=true
+
+# Enable JVM IR backend for all modules except libraries such as kotlin-stdlib, kotlin-reflect, kotlin-test.
 #kotlin.build.useIR=true
+# Enable JVM IR backend for the libraries mentioned above.
+#kotlin.build.useIRForLibraries=true
+
 #maven.repository.mirror=http://repository.jetbrains.com/remote-repos/
 #bootstrap.kotlin.repo=https://dl.bintray.com/kotlin/kotlin-dev
 #bootstrap.kotlin.version=1.1.50-dev-1451

libraries/commonConfiguration.gradle

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 ext.configureJavaOnlyJvm6Project = { Project project ->
     project.tasks.withType(JavaCompile) {
         sourceCompatibility = 1.6
@@ -193,6 +195,19 @@ ext.configureLegacyPublishing = { Project project ->
     }
 }
 
+ext.configureJvmIrBackend = { Project project ->
+    project.tasks.withType(KotlinCompile.class) { task ->
+        task.kotlinOptions {
+            if (CommonUtilKt.getBooleanProperty(project, "kotlin.build.useIRForLibraries")) {
+                useIR = true
+                freeCompilerArgs += ["-Xir-binary-with-stable-abi"]
+            } else {
+                useIR = false
+            }
+        }
+    }
+}
+
 allprojects { project ->
     project.ext.configureSourcesJar = { lambda = {} ->
         ArtifactsKt.sourcesJar(project) { task ->

libraries/kotlin.test/junit/build.gradle

@@ -38,6 +38,8 @@ compileTestKotlin {
     kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
 }
 
+configureJvmIrBackend(project)
+
 if (includeJava9) {
     compileJava9Sources(project, 'kotlin.test.junit')
 }

libraries/kotlin.test/junit5/build.gradle

@@ -48,6 +48,8 @@ compileTestKotlin {
     kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
 }
 
+configureJvmIrBackend(project)
+
 if (includeJava9) {
     compileJava9Sources(project, 'kotlin.test.junit5')
 }

libraries/kotlin.test/jvm/build.gradle

@@ -53,6 +53,8 @@ compileTestKotlin {
     kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
 }
 
+configureJvmIrBackend(project)
+
 if (includeJava9) {
     compileJava9Sources(project, 'kotlin.test')
 }

libraries/kotlin.test/testng/build.gradle

@@ -41,6 +41,8 @@ compileTestKotlin {
     kotlinOptions.freeCompilerArgs = ["-Xallow-kotlin-package"]
 }
 
+configureJvmIrBackend(project)
+
 if (includeJava9) {
     compileJava9Sources(project, 'kotlin.test.testng')
 }

libraries/reflect/api/build.gradle

@@ -52,6 +52,8 @@ compileKotlin {
     }
 }
 
+configureJvmIrBackend(project)
+
 jar {
     manifestAttributes(manifest, project, "internal")
 }

libraries/stdlib/jdk7/build.gradle

@@ -91,6 +91,8 @@ compileTestKotlin {
     ]
 }
 
+configureJvmIrBackend(project)
+
 compileJava9Sources(project, 'kotlin.stdlib.jdk7')
 
 test {

libraries/stdlib/jdk8/build.gradle

@@ -84,6 +84,8 @@ compileTestKotlin {
     ]
 }
 
+configureJvmIrBackend(project)
+
 compileJava9Sources(project, 'kotlin.stdlib.jdk8')
 
 test {

libraries/stdlib/jvm/build.gradle

@@ -145,6 +145,8 @@ compileLongRunningTestKotlin {
     kotlinOptions.freeCompilerArgs += "-Xopt-in=kotlin.ExperimentalStdlibApi"
 }
 
+configureJvmIrBackend(project)
+
 task longRunningTest(type: Test, dependsOn: longRunningTestClasses) {
     group = "verification"
     testClassesDirs = sourceSets.longRunningTest.output.classesDirs

libraries/tools/kotlin-annotations-jvm/build.gradle

@@ -33,3 +33,4 @@ compileKotlin {
     ]
 }
 
+configureJvmIrBackend(project)

libraries/tools/script-runtime/build.gradle

@@ -39,3 +39,5 @@ compileKotlin {
             "-module-name", project.name
     ]
 }
+
+configureJvmIrBackend(project)