Use user project's object version for pods project

Gemfile.lock

@@ -24,7 +24,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 6dbb3c73e5d0de6a2c171da0cabd90a5c4d20c09
+  revision: 7c37e41dafa5f6394900dab19eac9cc6580a9718
   branch: master
   specs:
     xcodeproj (0.24.0)

lib/cocoapods/installer.rb

@@ -444,7 +444,15 @@ module Pod
     #
     def prepare_pods_project
       UI.message '- Creating Pods project' do
-        @pods_project = Pod::Project.new(sandbox.project_path)
+        object_version = aggregate_targets.map(&:user_project_path).compact.map do |path|
+          Xcodeproj::Project.open(path)
+        end.map(&:object_version).map(&:to_i).sort.first
+
+        if object_version
+          @pods_project = Pod::Project.new(sandbox.project_path, false, object_version)
+        else
+          @pods_project = Pod::Project.new(sandbox.project_path)
+        end
 
         analysis_result.all_user_build_configurations.each do |name, type|
           @pods_project.add_build_configuration(name, type)

lib/cocoapods/project.rb

@@ -10,9 +10,12 @@ module Pod
     # @param  [Pathname, String] path @see path
     # @param  [Bool] skip_initialization
     #         Whether the project should be initialized from scratch.
+    # @param  [Int] object_version
+    #         Object version to use for serialization, defaults to Xcode 3.2 compatible.
     #
-    def initialize(path, skip_initialization = false)
-      super(path, skip_initialization)
+    def initialize(path, skip_initialization = false,
+        object_version = Xcodeproj::Constants::DEFAULT_OBJECT_VERSION)
+      super(path, skip_initialization, object_version)
       @support_files_group = new_group('Targets Support Files')
       @refs_by_absolute_path = {}
       @pods = new_group('Pods')

spec/unit/installer_spec.rb

@@ -440,7 +440,11 @@ module Pod
           pod_target_osx = PodTarget.new([], nil, config.sandbox)
           pod_target_ios.stubs(:platform).returns(Platform.new(:ios, '6.0'))
           pod_target_osx.stubs(:platform).returns(Platform.new(:osx, '10.8'))
-          @installer.stubs(:aggregate_targets).returns([pod_target_ios, pod_target_osx])
+          aggregate_target_ios = AggregateTarget.new(nil, config.sandbox)
+          aggregate_target_osx = AggregateTarget.new(nil, config.sandbox)
+          aggregate_target_ios.stubs(:platform).returns(Platform.new(:ios, '6.0'))
+          aggregate_target_osx.stubs(:platform).returns(Platform.new(:osx, '10.8'))
+          @installer.stubs(:aggregate_targets).returns([aggregate_target_ios, aggregate_target_osx])
           @installer.stubs(:pod_targets).returns([])
           @installer.send(:prepare_pods_project)
           build_settings = @installer.pods_project.build_configurations.map(&:build_settings)