From d9bac4d5e49a3b3b4848231113278010ae536bdd Mon Sep 17 00:00:00 2001
From: Vyacheslav Gerasimov <vyacheslav.gerasimov@jetbrains.com>
Date: Wed, 12 Aug 2020 21:40:04 +0300
Subject: [PATCH] Build: Warn about empty directories in sources

---
 build.gradle.kts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/build.gradle.kts b/build.gradle.kts
index 253990eb689..a0462849e2a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -457,6 +457,16 @@ allprojects {
         outputs.doNotCacheIf("https://youtrack.jetbrains.com/issue/KT-37089") { true }
     }
 
+    tasks.withType<SourceTask>().configureEach {
+        doFirst {
+            source.visit {
+                if (file.isDirectory && file.listFiles()?.isEmpty() == true) {
+                    logger.warn("Empty source directories may cause build cache misses: " + file.absolutePath)
+                }
+            }
+        }
+    }
+
     normalization {
         runtimeClasspath {
             ignore("META-INF/MANIFEST.MF")