Script that enables Full Generic Sharing by default for all builds for Unity 2021

CppBuildPreprocessing.cs

using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;


    public class CppBuildPreprocessing : IPreprocessBuildWithReport
    {
        public int callbackOrder
        {
            get { return 0; }
        }

        public void OnPreprocessBuild(BuildReport report)
        {
            string addlArgs = "--generics-option=None,EnableFullSharing";
            UnityEngine.Debug.Log(
                $"Setting Additional IL2CPP Args = \"{addlArgs}\" for platform {report.summary.platform}");
            PlayerSettings.SetAdditionalIl2CppArgs(addlArgs);
        }
    }