Added AOT compatibility test

Part of the ongoing work for jstedfast/MailKit#1844

AotCompatibility/AotCompatibility.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
+    <TrimmerSingleWarn>false</TrimmerSingleWarn>
+    <SelfContained>true</SelfContained>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <UseMimeKitLite Condition=" '$(UseMimeKitLite)' == '' ">false</UseMimeKitLite>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MimeKit\MimeKit.csproj" Condition=" '$(UseMimeKitLite)' == 'false' " />
+    <TrimmerRootAssembly Include="MimeKit" Path="..\MimeKit\MimeKit.csproj" Condition=" '$(UseMimeKitLite)' == 'false' " />
+
+    <ProjectReference Include="..\MimeKit\MimeKitLite.csproj" Condition=" '$(UseMimeKitLite)' == 'true' " />
+    <TrimmerRootAssembly Include="MimeKitLite" Path="..\MimeKit\MimeKitLite.csproj" Condition=" '$(UseMimeKitLite)' == 'true' " />
+  </ItemGroup>
+
+</Project>

AotCompatibility/Program.cs

@@ -0,0 +1,57 @@
+//
+// Program.cs
+//
+// Author: Jeffrey Stedfast <jestedfa@microsoft.com>
+//
+// Copyright (c) 2013-2024 .NET Foundation and Contributors
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+using System.Text;
+
+using MimeKit;
+
+namespace AotCompatibility {
+    class Program
+    {
+        static int Main (string[] args)
+        {
+            var location = System.AppContext.BaseDirectory;
+            var dir = Path.GetDirectoryName (location);
+
+            while (Path.GetFileName (dir) != "AotCompatibility")
+                dir = Path.GetFullPath (Path.Combine (dir!, ".."));
+
+            dir = Path.Combine (dir!, "..", "UnitTests", "TestData");
+
+            try {
+                Encoding.RegisterProvider (CodePagesEncodingProvider.Instance);
+
+                var path = Path.Combine (dir, "smime", "thunderbird-signed.txt");
+                var message = MimeMessage.Load (path);
+
+                return 0;
+            } catch (Exception ex) {
+                Console.WriteLine (ex);
+                return -1;
+            }
+        }
+    }
+}

MimeKit/MimeKit.csproj

@@ -52,9 +52,9 @@
     <DefineConstants>$(DefineConstants);SERIALIZABLE</DefineConstants>
   </PropertyGroup>
 
-  <!--<PropertyGroup>
+  <PropertyGroup>
     <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>
-  </PropertyGroup>-->
+  </PropertyGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) ">
     <Reference Include="System.Data" />

scripts/test-aot-compatibility.ps1

@@ -0,0 +1,41 @@
+param([string]$useMimeKitLite)
+
+$rootDirectory = Split-Path $PSScriptRoot -Parent
+$publishOutput = dotnet publish $rootDirectory/AotCompatibility/AotCompatibility.csproj -nodeReuse:false /p:UseSharedCompilation=false /p:ExposeExperimentalFeatures=true /p:UseMimeKitLite=$useMimeKitLite
+
+$actualWarningCount = 0
+
+foreach ($line in $($publishOutput -split "`r`n"))
+{
+    if ($line -like "*warning IL*")
+    {
+        Write-Host $line
+
+        $actualWarningCount += 1
+    }
+}
+
+pushd $rootDirectory/AotCompatibility/bin/Release/net8.0/win-x64/publish
+
+Write-Host "Executing test App..."
+./AotCompatibility.exe
+Write-Host "Finished executing test App"
+
+if ($LastExitCode -ne 0)
+{
+  Write-Host "There was an error while executing AotCompatibility Test App. LastExitCode is:", $LastExitCode
+}
+
+popd
+
+Write-Host "Actual warning count is:", $actualWarningCount
+$expectedWarningCount = 0
+
+$testPassed = 0
+if ($actualWarningCount -ne $expectedWarningCount)
+{
+    $testPassed = 1
+    Write-Host "Actual warning count:", actualWarningCount, "is not as expected. Expected warning count is:", $expectedWarningCount
+}
+
+Exit $testPassed