kn: parallelize CMake builds (#142)

Author: lauzadis

aws-crt-kotlin/build.gradle.kts

@@ -71,15 +71,15 @@ kotlin {
     // see: https://github.com/JetBrains/kotlin-native/issues/2423#issuecomment-466300153
     targets.withType<KotlinNativeTarget> {
         val knTarget = this
-        logger.info("configuring $knTarget: ${knTarget.name}")
+        logger.info("configuring Kotlin/Native target $knTarget: ${knTarget.name}")
         val cmakeInstallTask = configureCrtCMakeBuild(knTarget, CMakeBuildType.Release)
         val targetInstallDir = project.cmakeInstallDir(knTarget)
         val headerDir = targetInstallDir.resolve("include")
         val libDir = targetInstallDir.resolve("lib")
 
         compilations["main"].cinterops {
             val interopDir = "$projectDir/native/interop"
-            println("configuring crt cinterop for: ${knTarget.name}")
+            logger.info("configuring crt cinterop for: ${knTarget.name}")
             val interopSettings = create("aws-crt") {
                 defFile("$interopDir/crt.def")
                 includeDirs(headerDir)

build-support/src/main/kotlin/aws/sdk/kotlin/gradle/crt/CMakeTasks.kt

@@ -151,14 +151,15 @@ private fun Project.registerCmakeBuildTask(
         outputs.dir(cmakeBuildDir)
 
         doLast {
+            val coresPlusOne = (Runtime.getRuntime().availableProcessors().toInt() + 1).toString()
+
             val args = mutableListOf(
                 "--build",
                 relativeBuildDir,
                 "--config",
                 buildType.toString(),
-                // FIXME There is a parallelism issue between linuxx64 and linuxarm64 causing flaky builds
-//                "--parallel",
-//                System.getProperty("org.gradle.workers.max", "16"),
+                "--parallel",
+                System.getProperty("org.gradle.workers.max", coresPlusOne),
             )
 
             val osxSdk = knTarget.konanTarget.osxDeviceSdkName