🐲 GN(android) Don't run find.py on build/android/ant/empty/res

build/config/android/internal_rules.gni

Index: build/config/android/internal_rules.gni
diff --git a/build/config/android/internal_rules.gni b/build/config/android/internal_rules.gni
index 61e5f97326d19f0c28474e7c298029b91dfd3db8..3b60f66729ee5d5557e6fa3c065cb75c675911f3 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -1827,11 +1827,16 @@ template("process_resources") {
 
     if (defined(invoker.resource_dirs)) {
       _all_resource_dirs += invoker.resource_dirs
-      sources_build_rel =
-          exec_script("//build/android/gyp/find.py",
-                      rebase_path(invoker.resource_dirs, root_build_dir),
-                      "list lines")
-      sources += rebase_path(sources_build_rel, ".", root_build_dir)
+
+      # Speed up "gn gen" by short-circuiting the empty directory.
+      if (invoker.resource_dirs != [ "//build/android/ant/empty/res" ] &&
+          invoker.resource_dirs != []) {
+        _sources_build_rel =
+            exec_script("//build/android/gyp/find.py",
+                        rebase_path(invoker.resource_dirs, root_build_dir),
+                        "list lines")
+        sources += rebase_path(_sources_build_rel, ".", root_build_dir)
+      }
     }
 
     if (defined(invoker.generated_resource_dirs)) {