Tests: Support two-stage compilation in external tests

backend.native/tests/build.gradle

@@ -88,12 +88,15 @@ project.convention.plugins.executor = ExecutorServiceKt.create(project)
 // Do not generate run tasks for konan built artifacts
 ext.konanNoRun = true
 
-// Enable two-stage compilation if the test_two_stage property is set.
+// Enable two-stage test compilation if the test_two_stage property is set.
 ext.twoStageEnabled = project.hasProperty("test_two_stage")
-if (twoStageEnabled) {
-    tasks.withType(KonanCompileNativeBinary.class) {
-        enableTwoStageCompilation = true
-    }
+
+tasks.withType(KonanCompileNativeBinary.class) {
+    enableTwoStageCompilation = twoStageEnabled
+}
+
+tasks.withType(RunExternalTestGroup.class) {
+    enableTwoStageCompilation = twoStageEnabled
 }
 
 allprojects {
@@ -240,10 +243,14 @@ task resultsTask() {
     }
 }
 
-static boolean isExcluded(String dir) {
+boolean isExcluded(String dir) {
     // List of tests that fail due to unresolved compiler bugs
     def excluded = [ "codegen/box/functions/bigArity" /* KT-26140 */ ]
 
+    if (project.twoStageEnabled) {
+        excluded += ["codegen/box/closures/captureInSuperConstructorCall", "codegen/box/enum"] // KT-33207.
+    }
+
     boolean result = false
     excluded.forEach {
         if (dir.endsWith(it.replace("/", File.separator))) {

build-tools/src/main/groovy/org/jetbrains/kotlin/KonanTest.groovy

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin
 
+import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.JavaExec
 import org.gradle.api.tasks.TaskAction
 import org.gradle.process.ExecResult
@@ -297,6 +298,14 @@ class RunExternalTestGroup extends OldKonanTest {
      */
     public def inDevelopersRun = false
 
+    /**
+     * If true, the test executable will be built in two stages:
+     * 1. Build a klibrary from sources.
+     * 2. Build a final executable from this klibrary.
+     */
+    @Input
+    public def enableTwoStageCompilation = false
+
     def groupDirectory = "."
     def outputSourceSetName = "testOutputExternal"
     String filter = project.findProperty("filter")
@@ -608,7 +617,16 @@ fun runTest() {
             compileList.add(project.file("testUtils.kt").absolutePath)
             compileList.add(project.file("helpers.kt").absolutePath)
             try {
-                runCompiler(compileList, buildExePath(), flags)
+                def exePath = buildExePath()
+                if (enableTwoStageCompilation) {
+                    // Two-stage compilation.
+                    def klibPath = "${exePath}.klib"
+                    runCompiler(compileList, klibPath, flags + ["-p", "library"])
+                    runCompiler([], exePath, flags + ["-l", klibPath, "-Xsource-library=$klibPath"])
+                } else {
+                    // Regular compilation.
+                    runCompiler(compileList, exePath, flags)
+                }
             } catch (Exception ex) {
                 project.logger.quiet("ERROR: Compilation failed for test suite: $name with exception", ex)
                 project.logger.quiet("The following files were unable to compile:")