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Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs

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+using System.Collections.Generic;
+using UnityEditor;
+
+namespace Mirror
+{
+    static class PreprocessorDefine
+    {
+        /// <summary>
+        /// Add define symbols as soon as Unity gets done compiling.
+        /// </summary>
+        [InitializeOnLoadMethod]
+        public static void AddDefineSymbols()
+        {
+#if UNITY_2021_2_OR_NEWER
+            string currentDefines = PlayerSettings.GetScriptingDefineSymbols(UnityEditor.Build.NamedBuildTarget.FromBuildTargetGroup(EditorUserBuildSettings.selectedBuildTargetGroup));
+#else
+            // Deprecated in Unity 2023.1
+            string currentDefines = PlayerSettings.GetScriptingDefineSymbolsForGroup(EditorUserBuildSettings.selectedBuildTargetGroup);
+#endif
+            // Remove oldest when adding next month's symbol.
+            // Keep a rolling 12 months of symbols.
+            HashSet<string> defines = new HashSet<string>(currentDefines.Split(';'))
+            {
+                "MIRROR",
+                "MIRROR_79_OR_NEWER",
+                "MIRROR_81_OR_NEWER",
+                "MIRROR_82_OR_NEWER",
+                "MIRROR_83_OR_NEWER",
+                "MIRROR_84_OR_NEWER",
+                "MIRROR_85_OR_NEWER",
+                "MIRROR_86_OR_NEWER",
+                "MIRROR_89_OR_NEWER"
+            };
+
+            // only touch PlayerSettings if we actually modified it,
+            // otherwise it shows up as changed in git each time.
+            string newDefines = string.Join(";", defines);
+            if (newDefines != currentDefines)
+            {
+#if UNITY_2021_2_OR_NEWER
+                PlayerSettings.SetScriptingDefineSymbols(UnityEditor.Build.NamedBuildTarget.FromBuildTargetGroup(EditorUserBuildSettings.selectedBuildTargetGroup), newDefines);
+#else
+                // Deprecated in Unity 2023.1
+                PlayerSettings.SetScriptingDefineSymbolsForGroup(EditorUserBuildSettings.selectedBuildTargetGroup, newDefines);
+#endif
+            }
+        }
+    }
+}