feat: support net8.0

Author: xperiandri

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+- Add .NET 8 support #748 [@xperiandri]
+
 ## [0.25.0] - 2025-07-11
 
 - Migrate from `Paket` to `Directory.Packages.props` #722 [@xperiandri]

build.fsx

@@ -254,7 +254,7 @@ Target.create "SelfCheck" (fun _ ->
 
     let consoleProj = Path.Combine(srcDir.FullName, "FSharpLint.Console", "FSharpLint.Console.fsproj") |> FileInfo
     let sol = Path.Combine(rootDir.FullName, solutionFileName) |> FileInfo
-    exec "dotnet" $"run lint %s{sol.FullName}" consoleProj.Directory.FullName
+    exec "dotnet" $"run --framework net9.0 lint %s{sol.FullName}" consoleProj.Directory.FullName
 )
 
 // --------------------------------------------------------------------------------------

src/FSharpLint.Console/FSharpLint.Console.fsproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFrameworks>net9.0;net8.0</TargetFrameworks>
     <OutputType>Exe</OutputType>
 
     <Title>FSharpLint.Console</Title>

src/FSharpLint.Core/FSharpLint.Core.fsproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFrameworks>net9.0;net8.0</TargetFrameworks>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <IsPackable>true</IsPackable>
@@ -146,6 +146,7 @@
     <PackageReference Include="Ionide.ProjInfo.FCS" />
     <PackageReference Include="Ionide.ProjInfo" />
     <PackageReference Include="Microsoft.Build" ExcludeAssets="runtime" />
+    <PackageReference Update="Microsoft.Build" ExcludeAssets="runtime" Condition="$(TargetFramework) == 'net8.0'" VersionOverride="17.11.31" />
     <PackageReference Include="Microsoft.Build.Locator" />
     <PackageReference Include="Microsoft.Build.Framework" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.Build.Tasks.Core" ExcludeAssets="runtime" />

tests/FSharpLint.FunctionalTest/TestConsoleApplication.fs

@@ -34,10 +34,13 @@ module Tests =
             basePath </> "src" </> "FSharpLint.Console" </> "bin" </> configDirName |> DirectoryInfo
 
         let dll =
-            match Seq.tryExactlyOne (binDir.EnumerateDirectories()) with
-            | Some dllDir ->
-                dllDir.FullName </> "dotnet-fsharplint.dll"
-            | None -> failwithf "No folder (or too many of them) found in %s" binDir.FullName
+            let dllDir =
+                binDir.EnumerateDirectories()
+                |> Seq.sortByDescending _.Name
+                |> Seq.tryHead
+            match dllDir with
+            | Some dir -> dir.FullName </> "dotnet-fsharplint.dll"
+            | None -> failwithf "No target framework folder found in %s" binDir.FullName
 
         let startInfo = ProcessStartInfo
                                 (FileName = "dotnet",