Avoid adding dependency on System.Threading.Channels to InteractiveHost (#79594)

Author: tmat

src/Dependencies/Threading/ChannelReaderExtensions.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#if !MICROSOFT_CODEANALYSIS_THREADING_NO_CHANNELS
+
 #nullable enable
 
 using System.Collections.Generic;
@@ -25,3 +27,5 @@ public static async IAsyncEnumerable<T> ReadAllAsync<T>(this ChannelReader<T> re
     }
 #endif
 }
+
+#endif

src/Dependencies/Threading/ProducerConsumer.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#if !MICROSOFT_CODEANALYSIS_THREADING_NO_CHANNELS
+
 #nullable enable
 
 using System;
@@ -395,3 +397,5 @@ private static async Task PerformActionAndCloseWriterAsync<TArgs>(
 
     #endregion
 }
+
+#endif

src/Dependencies/Threading/ProducerConsumerOptions.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#if !MICROSOFT_CODEANALYSIS_THREADING_NO_CHANNELS
+
 #nullable enable
 
 using System.Threading.Channels;
@@ -32,3 +34,5 @@ internal readonly record struct ProducerConsumerOptions
 #endif
     public bool SingleReader { get; init; }
 }
+
+#endif

src/Interactive/Host/Microsoft.CodeAnalysis.InteractiveHost.csproj

@@ -8,6 +8,9 @@
     <UseWindowsForms>true</UseWindowsForms>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GeneratePerformanceSensitiveAttribute>true</GeneratePerformanceSensitiveAttribute>
+    
+    <!-- Avoid dependency on System.Threading.Channels (unnecessary 32-bit NGEN'd binary) -->
+    <DefineConstants>$(DefineConstants);MICROSOFT_CODEANALYSIS_THREADING_NO_CHANNELS</DefineConstants>
 
     <!-- NuGet -->
     <IsPackable>true</IsPackable>
@@ -55,7 +58,6 @@
     add an explicit reference to System.Threading.Tasks.Dataflow to ensure that the correct
      BindingRedirect is included in the app.config of InteractiveHost.exe -->
     <PackageReference Include="System.Threading.Tasks.Dataflow" />
-    <PackageReference Include="System.Threading.Channels" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Update="InteractiveHostResources.resx" GenerateSource="true" />