Enable HMPP conditionally for Kotlin 1.4.x and not 1.3.7x

Author: h0tk3y

build.gradle

@@ -2,6 +2,7 @@
  * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 import org.jetbrains.kotlin.konan.target.HostManager
+import org.gradle.util.VersionNumber
 
 apply plugin: 'jdk-convention'
 apply from: rootProject.file("gradle/experimental.gradle")
@@ -79,6 +80,11 @@ buildscript {
 
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
 
+// Hierarchical project structures are not fully supported in 1.3.7x MPP, enable conditionally for 1.4.x
+if (VersionNumber.parse(kotlin_version) > VersionNumber.parse("1.3.79")) {
+    ext.set("kotlin.mpp.enableGranularSourceSetsMetadata", "true")
+}
+
 // todo:KLUDGE: This is needed to workaround dependency resolution between Java and MPP modules
 def configureKotlinJvmPlatform(configuration) {
     configuration.attributes.attribute(KotlinPlatformType.attribute, KotlinPlatformType.jvm)

gradle.properties

@@ -56,5 +56,7 @@ org.gradle.jvmargs=-Xmx2g
 # https://github.com/gradle/gradle/issues/11412
 systemProp.org.gradle.internal.publish.checksums.insecure=true
 
-kotlin.mpp.enableGranularSourceSetsMetadata=true
+# This is commented out, and the property is set conditionally in build.gradle, because 1.3.71 doesn't work with it.
+# Once this property is set by default in new versions or 1.3.71 is dropped, either uncomment or remove this line.
+#kotlin.mpp.enableGranularSourceSetsMetadata=true
 kotlin.mpp.enableCompatibilityMetadataVariant=true