Kotlin UP: Fulfill the new requirements for Kotlin User Projects (#4392)

Author: woainikk

build.gradle.kts

@@ -1,6 +1,9 @@
 import org.jetbrains.kotlin.config.KotlinCompilerVersion
 import org.jetbrains.kotlin.gradle.dsl.*
 import org.gradle.kotlin.dsl.*
+import org.gradle.kotlin.dsl.withType
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompilationTask
+import kotlin.collections.joinToString
 
 buildscript {
     if (shouldUseLocalMaven(rootProject)) {
@@ -171,3 +174,10 @@ if (isSnapshotTrainEnabled(rootProject)) {
     // Report Kotlin compiler version when building project
     println("Using Kotlin compiler version: ${KotlinCompilerVersion.VERSION}")
 }
+
+tasks.withType<KotlinCompilationTask<*>>().configureEach {
+    doFirst {
+        logger.info("Added Kotlin compiler flags: ${compilerOptions.freeCompilerArgs.get().joinToString(", ")}")
+        logger.info("allWarningsAsErrors=${compilerOptions.allWarningsAsErrors.get()}")
+    }
+}

buildSrc/src/main/kotlin/CommunityProjectsBuild.kt

@@ -201,11 +201,12 @@ fun KotlinCommonCompilerOptions.configureKotlinUserProject() {
  * See <https://github.com/Kotlin/kotlinx.coroutines/pull/4392#issuecomment-2775630200>
  */
 fun KotlinCommonCompilerOptions.addExtraCompilerFlags(project: Project) {
-    val extraOptions = project.providers.gradleProperty("kotlin_additional_cli_options").orNull
-    if (extraOptions != null) {
-        LOGGER.info("""Adding extra compiler flags '$extraOptions' for a compilation in the project $${project.name}""")
-        extraOptions.split(" ").forEach {
-            if (it.isNotEmpty()) freeCompilerArgs.add(it)
+    val extraOptions = project.providers.gradleProperty("kotlin_additional_cli_options")
+        .orNull?.let { options ->
+            options.removeSurrounding("\"").split(" ").filter { it.isNotBlank() }
         }
+    extraOptions?.forEach { option ->
+        freeCompilerArgs.add(option)
+        LOGGER.info("""Adding extra compiler flag '$option' for a compilation in the project $${project.name}""")
     }
 }