Microsoft.NET.ILLink.Tasks in .NET 8 does not target .NET 8 #82241
Description
Description
The Microsoft.NET.ILLink.Tasks NuGet in .NET 8 preview 1 does not target .NET 8, causing problems for custom linker steps when they are built with .NET 8.
Reproduction Steps
Follow the instructions here: https://gist.github.com/jonathanpeppers/99961b4639823206c2537c03c856b097, except:
- Install a later version of the .NET 8 preview 1
- Make sure .NET 7 is installed too.
Create a new maui project and try to build it:
$ dotnet new maui
$ dotnet build -f net8.0-iosExpected behavior
Successful build.
Actual behavior
Build failure:
Fatal error in IL Linker
Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Collections, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. File name: 'System.Collections, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at MonoTouch.Tuner.CoreTypeMapStep..ctor()
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions)
--- End of inner exception stack trace ---
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions)
at Mono.Linker.Driver.AddCustomStep(Pipeline pipeline, String arg)
at Mono.Linker.Driver.SetupContext(ILogger customLogger)
at Mono.Linker.Driver.Run(ILogger customLogger)
at Mono.Linker.Driver.Main(String[] args)
/Users/dmo/.nuget/packages/microsoft.net.illink.tasks/8.0.100-1.23067.1/build/Microsoft.NET.ILLink.targets(133,5): error MSB6006: "dotnet" exited with code 134. [/Users/dmo/work/CrazyEights/CrazyEights.csproj::TargetFramework=net8.0-ios]
/Users/dmo/.nuget/packages/microsoft.net.illink.tasks/8.0.100-1.23067.1/build/Microsoft.NET.ILLink.targets(86,5): error NETSDK1144: Optimizing assemblies for size failed. Optimization can be disabled by setting the PublishTrimmed property to false. [/Users/dmo/work/CrazyEights/CrazyEights.csproj::TargetFramework=net8.0-ios]
Regression?
Yes
Known Workarounds
Remove .NET 7.
Configuration
.NET 8.0.100-preview.1.23115.2
Other information
It's because this NuGet: https://dev.azure.com/dnceng/public/_artifacts/feed/dotnet8/NuGet/Microsoft.NET.ILLink.Tasks/versions/8.0.100-1.23067.1 is built for .NET 7:
$ unzip -l /Users/rolf/Downloads/microsoft.net.illink.tasks.8.0.100-1.23067.1.nupkg
Archive: /Users/rolf/Downloads/microsoft.net.illink.tasks.8.0.100-1.23067.1.nupkg
Length Date Time Name
--------- ---------- ----- ----
520 01-17-2023 18:35 _rels/.rels
977 01-17-2023 18:35 Microsoft.NET.ILLink.Tasks.nuspec
39872 01-17-2023 18:35 tools/net472/ILLink.Tasks.dll
421328 01-17-2023 18:34 tools/net472/Mono.Cecil.dll
20856 02-19-2020 10:05 tools/net472/System.Buffers.dll
189312 10-19-2020 18:37 tools/net472/System.Collections.Immutable.dll
141184 02-19-2020 10:05 tools/net472/System.Memory.dll
115856 05-15-2018 13:29 tools/net472/System.Numerics.Vectors.dll
462728 10-19-2020 18:45 tools/net472/System.Reflection.Metadata.dll
16768 10-19-2020 18:46 tools/net472/System.Runtime.CompilerServices.Unsafe.dll
721296 01-17-2023 18:35 tools/net7.0/illink.dll
40376 01-17-2023 18:35 tools/net7.0/ILLink.Tasks.dll
421328 01-17-2023 18:34 tools/net7.0/Mono.Cecil.dll
103888 01-17-2023 18:35 tools/net7.0/Mono.Cecil.Pdb.dll
6822 01-17-2023 18:35 tools/net7.0/illink.deps.json
324 01-17-2023 18:35 tools/net7.0/illink.runtimeconfig.json
24890 01-17-2023 18:35 tools/net7.0/ILLink.Tasks.deps.json
783 01-17-2023 18:33 Sdk/Sdk.props
1451 01-17-2023 18:33 build/Microsoft.NET.ILLink.Tasks.props
21256 01-17-2023 18:33 build/Microsoft.NET.ILLink.targets
10806 01-17-2023 18:33 build/6.0_suppressions.xml
7006 12-30-2022 18:15 Icon.png
787 01-17-2023 18:35 [Content_Types].xml
664 01-17-2023 18:35 package/services/metadata/core-properties/c7cfde231f344fc9b00bdaf0b59aea91.psmdcp
11403 01-17-2023 10:38 .signature.p7s
--------- -------
2782481 25 filesand our custom linker steps are built using .NET 8, thus things go wrong when the .NET 7 version of illink.dll (running on .NET 7) tries to load the custom linker steps built with .NET 8 (and this is also why having .NET 7 installed is required to reproduce the problem: if .NET 7 is not installed, illink.dll will be executed with .NET 8, and everything works).