1>FastUpToDate: Source '...\da\x.resources.dll' does not exist, not up-to-date. ()

[davhdavh]

Visual Studio Version

17.14.6

Summary

FastUpToDate breaks when build has resx files but is configured to not make satellite libs.

Steps to Reproduce

1. Add resx to project
2. Add

  <ItemGroup>
    <EmbeddedResource Update="@(EmbeddedResource)">
      <GenerateResource>false</GenerateResource>
    </EmbeddedResource>
  </ItemGroup>

  <Target Name="PreventMSB3030" DependsOnTargets="ComputeIntermediateSatelliteAssemblies" BeforeTargets="GenerateSatelliteAssemblies">
    <ItemGroup>
      <IntermediateSatelliteAssembliesWithTargetPath Remove="@(IntermediateSatelliteAssembliesWithTargetPath)"></IntermediateSatelliteAssembliesWithTargetPath>
    </ItemGroup>
  </Target>
  <Target Name="PreventNU5026" DependsOnTargets="SatelliteDllsProjectOutputGroup" BeforeTargets="_GetBuildOutputFilesWithTfm">
    <ItemGroup>
      <SatelliteDllsProjectOutputGroupOutput Remove="@(SatelliteDllsProjectOutputGroupOutput)"></SatelliteDllsProjectOutputGroupOutput>
    </ItemGroup>
  </Target>

Expected Behavior

FastUpToDate uses previous output as what it supposed to be created.

Actual Behavior

FastUpToDate assumes special files are created when special files are present.

User Impact

FastUpToDate does not work for anyone using different method than satellite resx generation

[drewnoakes]

I'm unable to reproduce this with the steps above. Can you please attach a minimal repro solution, or more detailed steps?

There are some docs on the FUTDC here https://github.com/dotnet/project-system/blob/main/docs/up-to-date-check.md that include instructions on grabbing detailed logs. Those logs will show why your project is not considered up-to-date, which will help further analysis.

[davhdavh]

Details repro:

1. Create new Blazor web app
2. Add <AccelerateBuildsInVisualStudio>true</AccelerateBuildsInVisualStudio> to all projects
3. Add this to the .Client csproj:

   <ItemGroup>
      <EmbeddedResource Update="@(EmbeddedResource)">
         <DependentUpon>%(FileName)</DependentUpon>
         <GenerateResource>false</GenerateResource>
      </EmbeddedResource>
   </ItemGroup>

   <Target Name="PreventMSB3030" DependsOnTargets="ComputeIntermediateSatelliteAssemblies" BeforeTargets="GenerateSatelliteAssemblies">
      <ItemGroup>
         <IntermediateSatelliteAssembliesWithTargetPath Remove="@(IntermediateSatelliteAssembliesWithTargetPath)" />
      </ItemGroup>
   </Target>
   <Target Name="PreventNU5026" DependsOnTargets="SatelliteDllsProjectOutputGroup" BeforeTargets="_GetBuildOutputFilesWithTfm">
      <ItemGroup>
         <SatelliteDllsProjectOutputGroupOutput Remove="@(SatelliteDllsProjectOutputGroupOutput)" />
      </ItemGroup>
   </Target>

4. Add xxx.resx and xxx.da.resx in client project.
5. build... get this every single time:

Build started at 12:01...
1>FastUpToDate: Build acceleration is enabled for this project via the 'AccelerateBuildsInVisualStudio' MSBuild property. See https://aka.ms/vs-build-acceleration. (ProjectA.Client)
1>FastUpToDate: The set of project items was changed more recently (2025-07-02 12:01:02.782) than the last successful build start time (2025-07-02 12:00:59.652), not up-to-date. (ProjectA.Client)
1>FastUpToDate:     The set of changed items is empty. (ProjectA.Client)
1>------ Build started: Project: ProjectA.Client, Configuration: Debug Any CPU ------
1>ProjectA.Client -> [REDACTED_PATH]\ProjectA.Client\bin\Debug\net9.0\ProjectA.Client.dll
1>ProjectA.Client (Blazor output) -> [REDACTED_PATH]\ProjectA.Client\bin\Debug\net9.0\wwwroot
2>FastUpToDate: Build acceleration is enabled for this project via the 'AccelerateBuildsInVisualStudio' MSBuild property. See https://aka.ms/vs-build-acceleration. (ProjectA)
2>FastUpToDate: Comparing timestamps of inputs and outputs: (ProjectA)
2>FastUpToDate:     No inputs are newer than earliest output '[REDACTED_PATH]\ProjectA\obj\Debug\net9.0\ProjectA.pdb' (2025-07-02 11:56:40.728). Newest input is '[REDACTED_PATH]\ProjectA.Client\obj\Debug\net9.0\ref\ProjectA.Client.dll' (2025-07-02 11:56:34.818). (ProjectA)
2>FastUpToDate: Input UpToDateCheckInput item '[REDACTED_PATH]\ProjectA.Client\obj\Debug\net9.0\staticwebassets.build.json' is newer (2025-07-02 12:01:10.633) than earliest output '[REDACTED_PATH]\ProjectA\obj\Debug\net9.0\staticwebassets.build.json' (2025-07-02 12:01:02.105), not up-to-date. (ProjectA)
2>------ Build started: Project: ProjectA, Configuration: Debug Any CPU ------
2>ProjectA -> [REDACTED_PATH]\ProjectA\bin\Debug\net9.0\ProjectA.dll
========== Build: 2 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 12:01 and took 02,803 seconds ==========
WARNING: Potential build performance issue in 'ProjectA.csproj'. The project does not appear up-to-date after a successful build: Source '[REDACTED_PATH]\ProjectA.Client\bin\Debug\net9.0\da\ProjectA.Client.resources.dll' does not exist, not up-to-date. See https://aka.ms/incremental-build-failure.