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Using SourceGenerators leads to CS0016 when path is too long

See original GitHub issue

Version Used: 4.2.0-4.22281.5 (8d3180e5) Also observed on some previous 4.2.* versions I’m not sure when I updated to 4.1.* I think it was working on 4.0.*

Steps to Reproduce:

Clone https://github.com/SonarSource/sonar-dotnet into path that is at least 45 character long. For example

C:\Projects\.Community\Xxxxxxx sonar-dotnet

Open analyzers\SonarAnalyzer.sln
Try to build it

Expected Behavior:

Project should build. Just as it builds on shorter path like

C:\Projects\sonar-dotnet

Actual Behavior:

Build fails. Our project uses Source Generators from StyleCop that generates dozens of files. These 7 files have path longer than 256 characters and fails to be generated.

3>------ Build started: Project: SonarAnalyzer.CFG, Configuration: Debug Any CPU ------
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\net46\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionListSyntaxWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\net46\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionListSyntaxWrapper.g.cs'.'
3>Done building project "SonarAnalyzer.CFG.csproj" -- FAILED.
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\IObjectOrCollectionInitializerOperationWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\IObjectOrCollectionInitializerOperationWrapper.g.cs'.'
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\ICollectionElementInitializerOperationWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\ICollectionElementInitializerOperationWrapper.g.cs'.'
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\IStaticLocalInitializationSemaphoreOperationWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.OperationLightupGenerator\IStaticLocalInitializationSemaphoreOperationWrapper.g.cs'.'
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionListSyntaxWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionListSyntaxWrapper.g.cs'.'
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionSyntaxWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\FunctionPointerUnmanagedCallingConventionSyntaxWrapper.g.cs'.'
3>CSC : error CS0016: Could not write to output file 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\ImplicitStackAllocArrayCreationExpressionSyntaxWrapper.g.cs' -- 'Could not find a part of the path 'D:\Projects\.Community\Xxxxxxx sonar-dotnet\analyzers\src\SonarAnalyzer.CFG\obj\Debug\netstandard2.0\generated\SonarAnalyzer.ShimLayer.CodeGeneration\StyleCop.Analyzers.CodeGeneration.SyntaxLightupGenerator\ImplicitStackAllocArrayCreationExpressionSyntaxWrapper.g.cs'.'
3>Done building project "SonarAnalyzer.CFG.csproj" -- FAILED.

Note: I’m sure this was working fine before on the same path. Last time I worked with this path was around 01/2022