HYBRIDCLR/Editor/BuildProcessors/MsvcStdextWorkaround.cs

#if UNITY_EDITOR
using System;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;

namespace HybridCLR.Editor.BuildProcessors
{

    public class MsvcStdextWorkaround : IPreprocessBuildWithReport
    {
        const string kWorkaroundFlag = "/D_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS";

        public int callbackOrder => 0;

        public void OnPreprocessBuild(BuildReport report)
        {
            var clEnv = Environment.GetEnvironmentVariable("_CL_");

            if (string.IsNullOrEmpty(clEnv))
            {
                Environment.SetEnvironmentVariable("_CL_", kWorkaroundFlag);
            }
            else if (!clEnv.Contains(kWorkaroundFlag))
            {
                clEnv += " " + kWorkaroundFlag;
                Environment.SetEnvironmentVariable("_CL_", clEnv);
            }
        }
    }
}

#endif // UNITY_EDITOR