Pass kotlin_Werror_override and kotlin_additional_cli_options to int tests (#316)

Closes #315

Author: fzhinkin

integration/build.gradle.kts

@@ -38,4 +38,8 @@ tasks.test {
     }
     systemProperty("minSupportedGradleVersion", libs.versions.minSupportedGradle.get())
     systemProperty("minSupportedKotlinVersion", libs.versions.minSupportedKotlin.get())
+    systemProperty("kotlin_Werror_override", if (getAllWarningsAsErrorsValue(project)) "enable" else "disable")
+    project.providers.gradleProperty("kotlin_additional_cli_options").orNull?.let {
+        systemProperty("kotlin_additional_cli_options", it)
+    }
 }

integration/src/main/kotlin/kotlinx/benchmark/integration/ProjectBuilder.kt

@@ -45,6 +45,26 @@ private val kotlin_api_version = System.getProperty("kotlin_api_version")?.let {
     "apiVersion = org.jetbrains.kotlin.gradle.dsl.KotlinVersion.fromVersion('$it')"
 }.orEmpty()
 
+private val kotlin_warnings_settings = System.getProperty("kotlin_Werror_override")?.let {
+    when (it) {
+        "disable" -> "freeCompilerArgs.addAll(\"-Wextra\", \"-Xuse-fir-experimental-checkers\")"
+        else -> "allWarningsAsErrors = true"
+    }
+} ?: false
+
+private val kotlin_additional_cli_options = System.getProperty("kotlin_additional_cli_options")?.let {
+    val args = it.split(' ').map(String::trim).filter(String::isNotBlank)
+        .joinToString(prefix = "\"", separator = "\", \"", postfix = "\"") { opt ->
+            opt.replace("\\", "\\\\")
+                .replace("\n", "\\n")
+                .replace("\t", "\\t")
+                .replace("\b", "\\b")
+                .replace("\r", "\\r")
+                .replace("\"", "\\\"")
+        }
+    "freeCompilerArgs.addAll($args)"
+} ?: ""
+
 private fun generateBuildScript(kotlinVersion: String, jvmToolchain: Int) =
     """
     buildscript {
@@ -86,7 +106,8 @@ private fun generateBuildScript(kotlinVersion: String, jvmToolchain: Int) =
             $kotlin_api_version
 
             progressiveMode = true
-            allWarningsAsErrors = true
+            $kotlin_warnings_settings
+            $kotlin_additional_cli_options         
         }
     }
     """.trimIndent()