[K/N][build] Make kotlin-native shared be included subproject

kotlin-native/build-tools/build.gradle.kts

@@ -59,6 +59,8 @@ dependencies {
 
     implementation("org.jetbrains.kotlin:kotlin-util-klib:${project.bootstrapKotlinVersion}")
     implementation("org.jetbrains.kotlin:kotlin-native-utils:${project.bootstrapKotlinVersion}")
+
+    api(project(":kotlin-native-shared"))
 }
 
 java {
@@ -91,8 +93,6 @@ kotlin {
     sourceSets {
         main {
             kotlin.srcDir("src/main/kotlin")
-            kotlin.srcDir("../../kotlin-native/shared/src/library/kotlin")
-            kotlin.srcDir("../../kotlin-native/shared/src/main/kotlin")
             kotlin.srcDir("../../kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin")
         }
     }

kotlin-native/build-tools/gradle.properties

@@ -12,3 +12,5 @@ org.gradle.java.installations.fromEnv=\
   JDK_15_0,JDK_15,\
   JDK_16_0,\
   JDK_17_0
+
+kotlin.native.build.composite-bootstrap=true

kotlin-native/build-tools/settings.gradle.kts

@@ -26,4 +26,18 @@ buildscript {
     dependencies {
         classpath("org.jetbrains.kotlin:kotlin-build-gradle-plugin:$buildGradlePluginVersion")
     }
-}
+}
+
+include(":kotlin-native-shared")
+project(":kotlin-native-shared").projectDir = File("$rootDir/../shared")
+
+// This code could potentially remove the need of bootstrapping code that use util-klib and util-io
+// by building them, but it's not possible right now, because they use buildSrc plugins (like JPS) and methods (like commonDependency).
+// This could be fixed by replacing the buildSrc with the composite build like build-tools, and splitting it to several parts.
+//include(":native:kotlin-native-utils")
+//include(":kotlin-util-klib")
+//include(":kotlin-util-io")
+
+//project(":native:kotlin-native-utils").projectDir = File("$rootDir/../../native/kotlin-native-utils")
+//project(":kotlin-util-klib").projectDir = File("$rootDir/../../compiler/util-klib")
+//project(":kotlin-util-io").projectDir = File("$rootDir/../../compiler/util-io")