Merge pull request #24130 from dotnet/prkrishn/pin-compiler-version

Pin the compiler version in RSG to an exact version

Author: chsienki

eng/Versions.props

@@ -153,6 +153,7 @@
   <PropertyGroup Label="Manually updated">
     <!-- Dependencies from https://github.com/microsoft/MSBuildLocator -->
     <MicrosoftBuildLocatorPackageVersion>1.4.1</MicrosoftBuildLocatorPackageVersion>
+    <MicrosoftCodeAnalysisCSharpAnalyzerPinnedVersionPackageVersion>4.0.1</MicrosoftCodeAnalysisCSharpAnalyzerPinnedVersionPackageVersion>
   </PropertyGroup>
   <PropertyGroup>
     <!-- Dependencies from https://github.com/dotnet/xliff-tasks -->

src/RazorSdk/SourceGenerators/Microsoft.NET.Sdk.Razor.SourceGenerators.csproj

@@ -11,8 +11,14 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <!-- Use a pinned version of the compiler unless building from source. This avoids issues where the source generator is unable to launch in VS because the compiler versions is older than the one in the SDK. -->
+    <RSG_MicrosoftCodeAnalysisCSharpPackageVersion Condition="'$(DotNetBuildFromSource)' != 'true'">$(MicrosoftCodeAnalysisCSharpAnalyzerPinnedVersionPackageVersion)</RSG_MicrosoftCodeAnalysisCSharpPackageVersion>
+    <RSG_MicrosoftCodeAnalysisCSharpPackageVersion Condition="'$(DotNetBuildFromSource)' == 'true'">$(MicrosoftCodeAnalysisCSharpPackageVersion)</RSG_MicrosoftCodeAnalysisCSharpPackageVersion>
+  </PropertyGroup>
+
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(MicrosoftCodeAnalysisCSharpPackageVersion)" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(RSG_MicrosoftCodeAnalysisCSharpPackageVersion)" />
     <PackageReference Include="Microsoft.AspNetCore.Razor.SourceGenerator.Tooling.Internal" Version="$(MicrosoftAspNetCoreRazorSourceGeneratorToolingInternalPackageVersion)" GeneratePathProperty="true" />
   </ItemGroup>