Upgrading to Visual Studio 2022 breaks the x86 kernel compile due to 64-bit MSBuild

[FrankRay78]

By default, Visual Studio 2022 uses a 64-bit MSBuild, unlike earlier versions that used a 32-bit MSBuild. When I follow the instructions here, step 6. 'The OS should now build.' fails with the following message:

11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003: Library Loader encountered an unexpected error. Could not load file or assembly 'file:///D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll' or one of its dependencies. An attempt was made to load a program with an incorrect format.
11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003:    at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003:    at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003:    at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003:    at System.Reflection.Assembly.LoadFrom(String assemblyFile)
11>D:\Source\Repos\FlingOS\Kernel\Kernel\bin\Debug\Kernel.dll : error LDR0003:    at Drivers.Compiler.LibraryLoader.LoadILLibraryFromFile(String FilePath) in D:\Source\Repos\FlingOS\Drivers\Compiler\LibraryLoader.cs:line 74

An attempt was made to load a program with an incorrect format.

What is happening is the MSBuild task, built under configuration Any CPU, is being run as a 64-bit process by Visual Studio. However, the Kernel binary, built under configuration x86, is a 32-bit file. Hence the 'incorrect format' exception.

This exact issue was written about in a Microsoft blog, here: https://devblogs.microsoft.com/dotnet/msbuild-and-64-bit-visual-studio-2022/

The solution here is to run the 32-bit MSBuild task instead. Several ways exist to do that, in my case I added Architecture="x86" to the following lines in Kernel.csproj ie.

<UsingTask Architecture="x86" Condition="'$(Configuration)' == 'Debug'" AssemblyFile="$(SolutionDir)Drivers\Compiler\MSBuildTask\bin\Debug\Drivers.Compiler.MSBuildTask.dll" TaskName="MSBuildTask.BuildTask" />
<UsingTask Architecture="x86" Condition="'$(Configuration)' == 'Release'" AssemblyFile="$(SolutionDir)Drivers\Compiler\MSBuildTask\bin\Release\Drivers.Compiler.MSBuildTask.dll" TaskName="MSBuildTask.BuildTask" />

Microsoft guidance specifically says, 'This change is backward compatible... we recommend making this change unconditionally and not trying to detect Visual Studio 2022'

The x86/32-bit kernel now compiles successfully.