[K/N] Fix compdb usage for CLion

Merge-request: KT-MR-6483
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/cpp/GenerateCompilationDatabase.kt

@@ -129,7 +129,12 @@ abstract class GenerateCompilationDatabase : DefaultTask() {
                 serialized.addAll(gson.fromJson(it, Array<SerializedEntry>::class.java))
             }
         }
-        serialized.addAll(entries.get().flatMap { SerializedEntry.fromEntry(it) })
+        entries.get().forEach {
+            // TODO: Reconsider when we use source directory for this.
+            // Make sure directories actually exist.
+            it.directory.asFile.get().mkdirs()
+            serialized.addAll(SerializedEntry.fromEntry(it))
+        }
         FileWriter(outputFile.asFile.get()).use {
             gson.toJson(serialized, it)
         }

kotlin-native/build.gradle

@@ -748,6 +748,11 @@ compilationDatabase {
     allTargets {
         mergeFrom(provider { project("common") })
         mergeFrom(provider { project("runtime") })
+
+        // TODO: Reconsider this
+        task.configure {
+            dependsOn(":kotlin-native:runtime:downloadGoogleTest")
+        }
     }
 }