Address code review: fix LoadLocalFSharpBuild, simplify versions, remove unwanted files

- Fixed project files to properly use DirectoryBuildPropsPath for controlling UseLocalCompiler import
- Simplified version scheme to "local", "latest", "9" as requested
- Added all combinations with "local" on at least one side (5 test cases total)
- Removed release notes entry as it's just tests
- Removed checked-in global.json and commandline.txt files
- Added .gitignore to prevent checking in test-generated files

Co-authored-by: T-Gro <46543583+T-Gro@users.noreply.github.com>

Author: Copilot

docs/release-notes/.FSharp.Compiler.Service/10.0.100.md

@@ -6,7 +6,6 @@
 * Diagnostics: add extended data for 'No constructors' error ([PR #18863](https://github.com/dotnet/fsharp/pull/18863))
 * FSharpType.Format: support top-level prefix generic types style. ([PR #18897](https://github.com/dotnet/fsharp/pull/18897))
 * FCS: allow getting captured types ([PR $18878](https://github.com/dotnet/fsharp/pull/18878))
-* Add compiler compatibility test suite to verify anonymous records work across different F# compiler versions. Test projects under tests/projects/CompilerCompat verify backward and forward compatibility scenarios.
 
 ### Fixed
 

tests/FSharp.Compiler.ComponentTests/CompilerCompatibilityTests.fs

@@ -13,12 +13,12 @@ type CompilerCompatibilityTests() =
     let libProjectPath = Path.Combine(projectsPath, "CompilerCompatLib")
     let appProjectPath = Path.Combine(projectsPath, "CompilerCompatApp")
 
-    let createGlobalJson targetFramework projectPath =
-        let globalJsonContent = $"""{{
-  "sdk": {{
-    "version": "{targetFramework}"
-  }}
-}}"""
+    let createGlobalJson version projectPath =
+        let globalJsonContent = 
+            match version with
+            | "9" -> """{"sdk":{"version":"9.0.100"}}"""
+            | _ -> failwith $"Unsupported version for global.json: {version}"
+        
         let globalJsonPath = Path.Combine(projectPath, "global.json")
         File.WriteAllText(globalJsonPath, globalJsonContent)
         globalJsonPath
@@ -30,12 +30,9 @@ type CompilerCompatibilityTests() =
     let runDotnetBuild projectPath compilerVersion =
         let globalJsonPath = 
             match compilerVersion with
-            | "local" -> 
-                // For local compiler, use LoadLocalFSharpBuild property
-                None
-            | version -> 
-                // For specific .NET versions, create global.json
-                Some (createGlobalJson version projectPath)
+            | "local" -> None
+            | "latest" -> None  
+            | version -> Some (createGlobalJson version projectPath)
 
         let args = 
             match compilerVersion with
@@ -73,8 +70,10 @@ type CompilerCompatibilityTests() =
 
     [<Theory>]
     [<InlineData("local", "local", "Baseline scenario - Both library and app built with local compiler")>]
-    [<InlineData("10.0.100-rc.1.25411.109", "local", "Forward compatibility - Library built with .NET 10 SDK, app with local compiler")>]
-    [<InlineData("local", "10.0.100-rc.1.25411.109", "Backward compatibility - Library built with local compiler, app with .NET 10 SDK")>]
+    [<InlineData("latest", "local", "Forward compatibility - Library built with latest SDK, app with local compiler")>]
+    [<InlineData("local", "latest", "Backward compatibility - Library built with local compiler, app with latest SDK")>]
+    [<InlineData("9", "local", "Forward compatibility - Library built with .NET 9 SDK, app with local compiler")>]
+    [<InlineData("local", "9", "Backward compatibility - Library built with local compiler, app with .NET 9 SDK")>]
     member _.``Compiler compatibility test``(libCompilerVersion: string, appCompilerVersion: string, scenarioDescription: string) =
         // Clean previous builds
         cleanBinObjDirectories libProjectPath

tests/projects/CompilerCompat/.gitignore

@@ -0,0 +1,5 @@
+# Ignore test-generated files
+global.json
+commandline.txt
+StandardOutput.txt
+StandardError.txt

tests/projects/CompilerCompat/CompilerCompatApp/CompilerCompatApp.fsproj

@@ -3,6 +3,8 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net8.0</TargetFramework>
+    <DirectoryBuildPropsPath Condition="'$(LoadLocalFSharpBuild)' == 'True'">../../../../UseLocalCompiler.Directory.Build.props</DirectoryBuildPropsPath>
+    <DirectoryBuildPropsPath Condition="'$(LoadLocalFSharpBuild)' != 'True'"></DirectoryBuildPropsPath>
   </PropertyGroup>
 
   <ItemGroup>

tests/projects/CompilerCompat/CompilerCompatApp/commandline.txt

@@ -3,6 +3,8 @@
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <DirectoryBuildPropsPath Condition="'$(LoadLocalFSharpBuild)' == 'True'">../../../../UseLocalCompiler.Directory.Build.props</DirectoryBuildPropsPath>
+    <DirectoryBuildPropsPath Condition="'$(LoadLocalFSharpBuild)' != 'True'"></DirectoryBuildPropsPath>
   </PropertyGroup>
 
   <ItemGroup>