BL_BuildPostProcess.cs

using UnityEngine;
using UnityEditor;
using UnityEditor.Callbacks;
using System.Collections;
using UnityEditor.iOS.Xcode;
using System.IO;

public class BL_BuildPostProcess
{

    [PostProcessBuild]
    public static void OnPostprocessBuild(BuildTarget buildTarget, string path)
    {
#if UNITY_IOS

        if (buildTarget == BuildTarget.iOS)
        {
            Debug.Log("BuildTarget IOS!!");
            string projPath = path + "/Unity-iPhone.xcodeproj/project.pbxproj";
            Debug.Log("PATH: " + path);
            Debug.Log("PROJPATH: " + projPath);


            PBXProject proj = new PBXProject();
            string src = File.ReadAllText(projPath);
            Debug.Log("SRC: " + src);
            proj.ReadFromString(src);

            string target = proj.TargetGuidByName("Unity-iPhone");
            Debug.Log("TARGET" + target);

            //proj.AddBuildProperty(target, "OTHER_LDFLAGS", "$(inherited)");
            //proj.AddBuildProperty(target, "HEADER_SEARCH_PATHS", "$(inherited)");
            //proj.AddBuildProperty(target, "OTHER_CFLAGS", "$(inherited)");
            proj.UpdateBuildProperty(target, "OTHER_LDFLAGS", new string[] { "$(inherited)" }, new string[] { });
            proj.UpdateBuildProperty(target, "HEADER_SEARCH_PATHS", new string[] { "$(inherited)" }, new string[] { });
            proj.UpdateBuildProperty(target, "OTHER_CFLAGS", new string[] { "$(inherited)" }, new string[] { });
            proj.SetBuildProperty(target, "ENABLE_BITCODE", "NO");
            
            string guid = proj.FindFileGuidByProjectPath("Libraries/Plugins/iOS/GPGSAppController.mm");
            System.Collections.Generic.List<string> args = new System.Collections.Generic.List<string> { "-fobjc-arc" };
            proj.SetCompileFlagsForFile(target, guid, args);


            string dst = proj.WriteToString();
            Debug.Log("DST" + dst);
            File.WriteAllText(projPath, dst);



            // Add url schema to plist file
            string plistPath = path + "/Info.plist";
            PlistDocument plist = new PlistDocument();
            plist.ReadFromString(File.ReadAllText(plistPath));

            // Get root
            PlistElementDict rootDict = plist.root;
            rootDict.SetBoolean("UIRequiresFullScreen", true);
            plist.WriteToFile(plistPath);
        }
#endif
    }
}

Podfile

platform :ios, '7.0'

target 'Unity-iPhone' do
    pod 'GooglePlayGames', '5.1.2'
end

target 'Unity-iPhone Tests' do
    pod 'GooglePlayGames', '5.1.2'
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['ENABLE_BITCODE'] = 'NO'
    end
  end
end