My github actions workflow doesn't work after migrated header file to mixed module way.

[hoshiizumiya (hoshiizumiya)]

You can check my workflow file here. https://github.com/hoshiizumiya/OpenNet/actions/runs/27895217083/workflow
I dont know what caused it. The path is looked fine.

But winrt module files and vcpkg provided header files all can't be found. It works in my computer but CI.

Yexuan Xiao (@YexuanXiao) suggested it's my workflow file or vcxproj file's problem, but it is werid. They're all looks fine.
Richard Thomson (@LegalizeAdulthood) Mark Callow (@MarkCallow) Ryan Shepherd (@DefaultRyan) Charles Milette (@sylveon)

[Andrei Ovcharenko (krotname)]

The log points to the vcpkg manifest restore happening too late for the first C++ module pass.

In both matrix jobs, the first real failures are:

• TorrentMetadataFetcher.ixx: libtorrent/fwd.hpp not found
• Aria2Models.ixx / Aria2Helpers.ixx: nlohmann/json.hpp not found

Those dependencies are in OpenNet/vcpkg.json, and OpenNet.vcxproj has VcpkgEnableManifest=true, so vcpkg is being picked up. But in the failed run the order is roughly:

1. MSVC starts scanning/compiling .ixx files with an include path like OpenNet\vcpkg_installed\arm64-windows\arm64-windows\include.
2. The headers are not there yet, so the scan emits C1083 and then MSB8074 for the module dependency files.
3. Only after that, MSBuild enters C:\vcpkg\scripts\buildsystems\msbuild\support\InstallImplementation.targets and runs vcpkg install with --x-manifest-root=...\OpenNet\ and --x-install-root=...\OpenNet\vcpkg_installed\arm64-windows\.

So I would make the vcpkg restore explicit before the msbuild OpenNet\OpenNet.vcxproj step, using the same manifest root and install root that MSBuild later expects:

$triplet = if ('${{ matrix.platform }}' -eq 'ARM64') { 'arm64-windows' } else { 'x64-windows' }

& "$env:VCPKG_INSTALLATION_ROOT\vcpkg.exe" install `
  --triplet $triplet `
  --vcpkg-root "$env:VCPKG_INSTALLATION_ROOT" `
  --x-manifest-root "$env:GITHUB_WORKSPACE\OpenNet" `
  --x-install-root "$env:GITHUB_WORKSPACE\OpenNet\vcpkg_installed\$triplet"

Put that after the vcpkg NuGet source setup and before Build MSIX. vcpkg integrate install wires the MSBuild integration, but in this run it does not populate the manifest install tree before the module dependency scan starts.

The later std, winrt_base, and winrt.Windows.Foundation module errors look secondary. I would fix the vcpkg restore order first, then rerun once to see if any real C++/WinRT issue remains.

[hoshiizumiya (hoshiizumiya)]

Thank you. It works after I update with your suggestion. And do you think it's a msbuild&vcpkg work defect? I think it'a bug with this situation.

[Charles Milette (sylveon)]

Duplicate of #41479