Upgrading from 0.15.6 to 0.15.7 causes compiler mismatch issues

[Jetski5822]

We recently just tried to upgrade BenchmarkDotNet from 0.15.6 to 0.15.7.

When we try to compile however, we get this error

CSC : error CS9057: The analyzer assembly 'C:\Users\some.username\.nuget\packages\benchmarkdotnet.annotations\0.15.7\analyzers\dotnet\cs\BenchmarkDotNet.Analyzer
s.dll' references version '4.14.0.0' of the compiler, which is newer than the currently running version '4.11.0.0'. [C:\code\I
ntegration.Benchmark\Integration.Benchmark.csproj]

CSProj pretty much looks like this

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <IsPackable>false</IsPackable>
    <GenerateProgramFile>false</GenerateProgramFile>
    <NoWarn>$(NoWarn),CS7022</NoWarn>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="BenchmarkDotNet" />
    <PackageReference Include="BenchmarkDotNet.Diagnostics.dotMemory" />
    <PackageReference Include="BenchmarkDotNet.Diagnostics.dotTrace" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="BenchmarkDotNet.Artifacts\" />
  </ItemGroup>
  <ItemGroup>
    <RuntimeHostConfigurationOption Include="System.GC.ConserveMemory" Value="9" />
    <RuntimeHostConfigurationOption Include="System.GC.HeapHardLimit" Value="147000000" />
  </ItemGroup>
</Project>

and Directory.Packages.props has these specified

    <PackageVersion Include="BenchmarkDotNet" Version="0.15.7" />
    <PackageVersion Include="BenchmarkDotNet.TestAdapter" Version="0.15.7" />
    <PackageVersion Include="BenchmarkDotNet.Diagnostics.dotMemory" Version="0.15.7" />
    <PackageVersion Include="BenchmarkDotNet.Diagnostics.dotTrace" Version="0.15.7" />

The global.json file is

{
    "sdk": {
      "version": "8.0.415",
      "rollForward": "latestFeature"
    }
 }

The solution this is referenced is a dotnet 8.0.

my local SDKS look like

C:\code\L\some-service>dotnet --list-sdks
8.0.415 [C:\Program Files\dotnet\sdk]
9.0.307 [C:\Program Files\dotnet\sdk]
10.0.100 [C:\Program Files\dotnet\sdk]

Thoughts? as we are a little perplexed as to why this is failing given that the nuget versions all look correct.

[timcassell]

You can suppress that warning, it shouldn't affect functionality.

Cc @silkfire

[timcassell]

@silkfire Can you also take a look at this? Is there anything we can do here?

[silkfire]

@timcassell I got the same error too but in the latest version of VS 2022/2026. I got rid of it by downgrading the Microsoft.CodeAnalysis.CSharp package from 5.3.0 to 5.0.0 in the analyzer. But yeah maybe it has no effect for older VS versions...

[timcassell]

FWIW we also hit this warning on our side, but it's suppressed. I wonder what the proper guidance is, considering analyzers have to be netstandard2.0, but very old sdks support that tfm, and newer sdks also support it, but it complains about non-matching compiler versions...

[silkfire]

I got the "Inconsistent language versions" exception when I used an older version of Microsoft.CodeAnalysis.CSharp (< 5.0.0) when using the analyzer with .NET 10. So as you're saying maybe suppressing the warning is the way to go as I don't know how to properly resolve it.

For reference: Supported Roslyn package version mappings

[timcassell]

It looks like we may be able to multi-target for older compilers. dotnet/roslyn#81256 (reply in thread)