3 files changed, 10 insertions, 2 deletions

diff --git a/src/tools/heat/Data/HarvesterWarnings.cs b/src/tools/heat/Data/HarvesterWarnings.cs
index 80ee5c31..1bbd5bed 100644
--- a/src/tools/heat/Data/HarvesterWarnings.cs
+++ b/src/tools/heat/Data/HarvesterWarnings.cs
@@ -2,13 +2,17 @@
 
 namespace WixToolset.Harvesters.Data
 {
-    using System;
     using System.Resources;
     using WixToolset.Data;
 
 #pragma warning disable 1591 // TODO: add documentation
     public static class HarvesterWarnings
     {
+        public static Message HeatIsDeprecated()
+        {
+            return Message(null, Ids.HeatIsDeprecated, "Heat is deprecated and will be removed in WiX v7. Consider alternative solutions, like the Files element.");
+        }
+
         public static Message AssemblyHarvestFailed(string file, string message)
         {
             return Message(null, Ids.AssemblyHarvestFailed, "Could not harvest data from a file that was expected to be an assembly: {0}. If this file is not an assembly you can ignore this warning. Otherwise, this error detail may be helpful to diagnose the failure: {1}", file, message);
@@ -66,6 +70,7 @@ namespace WixToolset.Harvesters.Data
 
         public enum Ids
         {
+            HeatIsDeprecated = 5149,
             SelfRegHarvestFailed = 5150,
             AssemblyHarvestFailed = 5151,
             TypeLibLoadFailed = 5152,
diff --git a/src/tools/heat/HeatCommand.cs b/src/tools/heat/HeatCommand.cs
index 34198011..c8703ec1 100644
--- a/src/tools/heat/HeatCommand.cs
+++ b/src/tools/heat/HeatCommand.cs
@@ -15,7 +15,6 @@ namespace WixToolset.Harvesters
     using WixToolset.Extensibility.Data;
     using WixToolset.Extensibility.Services;
     using WixToolset.Harvesters.Extensibility;
-    using Wix = WixToolset.Harvesters.Serialize;
 
     internal class HeatCommand : BaseCommandLineCommand
     {
diff --git a/src/tools/heat/Program.cs b/src/tools/heat/Program.cs
index f74def8f..80423e18 100644
--- a/src/tools/heat/Program.cs
+++ b/src/tools/heat/Program.cs
@@ -12,6 +12,7 @@ namespace WixToolset.Tools.Heat
     using WixToolset.Extensibility.Data;
     using WixToolset.Extensibility.Services;
     using WixToolset.Harvesters;
+    using WixToolset.Harvesters.Data;
     using WixToolset.Harvesters.Extensibility;
     using WixToolset.Tools.Core;
 
@@ -78,6 +79,9 @@ namespace WixToolset.Tools.Heat
 
             var commandLine = HeatCommandLineFactory.CreateCommandLine(serviceProvider, heatExtensions);
             var command = commandLine.ParseStandardCommandLine(arguments);
+
+            messaging.Write(HarvesterWarnings.HeatIsDeprecated());
+
             return command?.ExecuteAsync(CancellationToken.None) ?? Task.FromResult(1);
         }
     }