Avoid “creating” the same directory over & over

lib/cocoapods/installer/xcode/pods_project_generator/target_installer.rb

@@ -109,13 +109,13 @@ module Pod
           # @return [Object] the result of the generator.
           #
           def update_changed_file(generator, path)
-            path.dirname.mkpath
             if path.exist?
               result = generator.save_as(support_files_temp_dir)
               unless FileUtils.identical?(support_files_temp_dir, path)
                 FileUtils.mv(support_files_temp_dir, path)
               end
             else
+              path.dirname.mkpath
               result = generator.save_as(path)
             end
             clean_support_files_temp_dir if support_files_temp_dir.exist?

lib/cocoapods/sandbox/headers_store.rb

@@ -96,6 +96,7 @@ module Pod
       # @return [Array<Pathname>]
       #
       def add_files(namespace, relative_header_paths)
+        root.join(namespace).mkpath unless relative_header_paths.empty?
         relative_header_paths.map do |relative_header_path|
           add_file(namespace, relative_header_path)
         end
@@ -115,9 +116,9 @@ module Pod
       #
       # @return [Pathname]
       #
-      def add_file(namespace, relative_header_path)
+      def add_file(namespace, relative_header_path, directory_made: false)
         namespaced_path = root + namespace
-        namespaced_path.mkpath unless File.exist?(namespaced_path)
+        namespaced_path.mkpath unless directory_made
 
         absolute_source = (sandbox.root + relative_header_path)
         source = absolute_source.relative_path_from(namespaced_path)