[Pods Project Generator] Improve performance by removing redundant processing…

[Pods Project Generator] Improve performance by removing redundant processing for native target dependencies

CHANGELOG.md

@@ -11,6 +11,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 * Improve performance of the dependency resolver by removing duplicates for dependency nodes.
   [Jacek Suliga](https://github.com/jmkk)
 
+* Improve performance of Pods project generator by skipping native targets for which dependent targets have already been added.
+  [Jacek Suliga](https://github.com/jmkk)
+
 ##### Bug Fixes
 
 * Inhibit warnings for all dependencies during validation except for the one being validated  

lib/cocoapods/installer/xcode/pods_project_generator.rb

@@ -312,6 +312,10 @@ module Pod
         end
 
         def add_dependent_targets_to_native_target(dependent_targets, native_target, is_app_extension, requires_frameworks, frameworks_group)
+          @processed_native_targets ||= Set.new
+          return if @processed_native_targets.include? native_target
+          @processed_native_targets << native_target
+
           dependent_targets.each do |pod_dependency_target|
             next unless pod_dependency_target.should_build?
             native_target.add_dependency(pod_dependency_target.native_target)