Use ComHost generation code from HostModel.

src/Tasks/Microsoft.NET.Build.Tasks/CreateComHost.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Text;
 using Microsoft.Build.Framework;
+using Microsoft.NET.HostModel.ComHost;
 
 namespace Microsoft.NET.Build.Tasks
 {
@@ -21,10 +22,17 @@ public class CreateComHost : TaskBase
 
         protected override void ExecuteCore()
         {
-            ComHost.Create(
-                ComHostSourcePath,
-                ComHostDestinationPath,
-                ClsidMapPath);
+            try
+            {
+                ComHost.Create(
+                    ComHostSourcePath,
+                    ComHostDestinationPath,
+                    ClsidMapPath);
+            }
+            catch (ComHostCustomizationUnsupportedOSException)
+            {
+                Log.LogError(Strings.CannotEmbedClsidMapIntoComhost);
+            }
         }
     }
 }

src/Tasks/Microsoft.NET.Build.Tasks/GenerateClsidMap.cs

@@ -9,6 +9,7 @@
 using System.Reflection.PortableExecutable;
 using System.Text;
 using Microsoft.Build.Framework;
+using Microsoft.NET.HostModel.ComHost;
 
 namespace Microsoft.NET.Build.Tasks
 {
@@ -40,6 +41,14 @@ protected override void ExecuteCore()
                         }
                     }
                 }
+                catch (MissingGuidException missingGuid)
+                {
+                    Log.LogError(Strings.ClsidMapExportedTypesRequireExplicitGuid, missingGuid.TypeName);
+                }
+                catch (ConflictingGuidException conflictingGuid)
+                {
+                    Log.LogError(Strings.ClsidMapConflictingGuids, conflictingGuid.TypeName1, conflictingGuid.TypeName2, conflictingGuid.Guid.ToString());
+                }
                 catch (BadImageFormatException)
                 {
                     Log.LogError(Strings.ClsidMapInvalidAssembly, IntermediateAssembly);

src/Tasks/Microsoft.NET.Build.Tasks/GenerateRegFreeComManifest.cs

@@ -9,6 +9,7 @@
 using System.Reflection.PortableExecutable;
 using System.Text;
 using Microsoft.Build.Framework;
+using Microsoft.NET.HostModel.ComHost;
 
 namespace Microsoft.NET.Build.Tasks
 {