[K/N][build] Composite build with build.tools-conventions plugin

Adds convention plugin instead of sources inclusion
inside the buildSrc, effectively reducing the amount
of the code to be compiled in buildSrc.

Merge-request: KT-MR-8898

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/KotlinNativePlatform.kt

@@ -18,11 +18,10 @@ import org.gradle.nativeplatform.TargetMachine
 import org.gradle.nativeplatform.TargetMachineFactory
 import org.gradle.nativeplatform.platform.NativePlatform
 import org.gradle.nativeplatform.platform.internal.*
-import org.jetbrains.kotlin.gradle.utils.isGradleVersionAtLeast
 import org.jetbrains.kotlin.konan.target.KonanTarget
 import org.jetbrains.kotlin.konan.util.visibleName
 
-interface KotlinNativePlatform: NativePlatform {
+interface KotlinNativePlatform : NativePlatform {
     val target: KonanTarget
 }
 
@@ -38,19 +37,18 @@ fun KonanTarget.getGradleCPU(): ArchitectureInternal = architecture.visibleName.
     Architectures.forInput(it)
 }
 
-fun KonanTarget.toTargetMachine(objectFactory: ObjectFactory): TargetMachine = object: TargetMachine {
+fun KonanTarget.toTargetMachine(objectFactory: ObjectFactory): TargetMachine = object : TargetMachine {
     override fun getOperatingSystemFamily(): OperatingSystemFamily =
-        getGradleOSFamily(objectFactory)
+            getGradleOSFamily(objectFactory)
 
     override fun getArchitecture(): MachineArchitecture =
-        objectFactory.named(MachineArchitecture::class.java, this@toTargetMachine.architecture.visibleName)
+            objectFactory.named(MachineArchitecture::class.java, this@toTargetMachine.architecture.visibleName)
 }
 
-class DefaultKotlinNativePlatform(name: String, override val target: KonanTarget):
+class DefaultKotlinNativePlatform(name: String, override val target: KonanTarget) :
         DefaultNativePlatform(name, target.getGradleOS(), target.getGradleCPU()),
-        KotlinNativePlatform
-{
-    constructor(target: KonanTarget): this(target.visibleName, target)
+        KotlinNativePlatform {
+    constructor(target: KonanTarget) : this(target.visibleName, target)
 
     // TODO: Extend ImmutableDefaultNativePlatform and get rid of these methods after switch to Gradle 4.8
     private fun notImplemented(): Nothing = throw NotImplementedError("Not Implemented in Kotlin/Native plugin")
@@ -62,50 +60,36 @@ class DefaultKotlinNativePlatform(name: String, override val target: KonanTarget
 // NativeVariantIdentity constructor was changed in Gradle 5.1
 // So we have to use reflection to create instance of this class in earlier versions.
 internal fun compatibleVariantIdentity(
-    project: Project,
-    name: String,
-    baseName: Provider<String>,
-    group: Provider<String>,
-    version: Provider<String>,
-    debuggable: Boolean,
-    optimized: Boolean,
-    target: KonanTarget,
-    linkUsage: UsageContext?,
-    runtimeUsage: UsageContext?
+        project: Project,
+        name: String,
+        baseName: Provider<String>,
+        group: Provider<String>,
+        version: Provider<String>,
+        debuggable: Boolean,
+        optimized: Boolean,
+        target: KonanTarget,
+        linkUsage: UsageContext?,
+        runtimeUsage: UsageContext?
 ): NativeVariantIdentity =
-    if (isGradleVersionAtLeast(5, 1)) {
-        val targetMachineFactory = (project as ProjectInternal).services.get(TargetMachineFactory::class.java)
-        NativeVariantIdentity(
-            name,
-            baseName,
-            group,
-            version,
-            debuggable,
-            optimized,
-            targetMachineFactory.os(target.family.name),
-            linkUsage,
-            runtimeUsage
-        )
-    } else {
         NativeVariantIdentity::class.java.getConstructor(
-            String::class.java,
-            Provider::class.java,
-            Provider::class.java,
-            Provider::class.java,
-            Boolean::class.javaPrimitiveType,
-            Boolean::class.javaPrimitiveType,
-            OperatingSystemFamily::class.java,
-            UsageContext::class.java,
-            UsageContext::class.java
+                String::class.java,
+                Provider::class.java,
+                Provider::class.java,
+                Provider::class.java,
+                Boolean::class.javaPrimitiveType,
+                Boolean::class.javaPrimitiveType,
+                OperatingSystemFamily::class.java,
+                UsageContext::class.java,
+                UsageContext::class.java
         ).newInstance(
-            name,
-            baseName,
-            group,
-            version,
-            debuggable,
-            optimized,
-            target.getGradleOSFamily(project.objects),
-            linkUsage,
-            runtimeUsage
+                name,
+                baseName,
+                group,
+                version,
+                debuggable,
+                optimized,
+                target.getGradleOSFamily(project.objects),
+                linkUsage,
+                runtimeUsage
         )
-    }
+

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/konan/KonanPlugin.kt

@@ -342,7 +342,7 @@ class KonanPlugin @Inject constructor(private val registry: ToolingModelBuilderR
                 // If the JDK that was set is not available get the JDK 11 as a default
                 service.launcherFor(object : Action<JavaToolchainSpec> {
                     override fun execute(toolchainSpec: JavaToolchainSpec) {
-                        toolchainSpec.languageVersion.set(JavaLanguageVersion.of(JdkMajorVersion.JDK_11_0.majorVersion))
+                        toolchainSpec.languageVersion.set(JavaLanguageVersion.of(11))   // FIXME: not resolved from buildSrc JdkMajorVersion.JDK_11_0.majorVersion))
                     }
                 }).get()
             }