Build hangs on "Looking for compilation errors..."

[morganbr]

Running .\DoAll.ps1 -ExcludeSamples -ExcludePackages hangs on the EmitWinmd task with "Looking for compliation errors...". I let it run for about 3 hours on a 24-core Xeon W-2265 before giving up. At that time, dotnet.exe was using about 30% cpu and 6gb of ram. My full build log is below:

PS G:\win32metadata> .\DoAll.ps1 -ExcludeSamples -ExcludePackages
Restoring buildtools project...
Determining projects to restore...
Restored G:\win32metadata\sources\WinmdUtils\WinmdUtils.csproj (in 405 ms).
Restored G:\win32metadata\sources\ClangSharpSourceToWinmd\ClangSharpSourceToWinmd.csproj (in 405 ms).
Restored G:\win32metadata\sources\ConstantsScraper\ConstantsScraper.csproj (in 405 ms).
Restored G:\win32metadata\buildtools\BuildTools.proj (in 405 ms).
Restored G:\win32metadata\sources\MetadataUtils\MetadataUtils.csproj (in 405 ms).
Restored G:\win32metadata\sources\GeneratorSdk\MetadataTasks\MetadataTasks.csproj (in 405 ms).
Building buildtools project...
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
MetadataUtils -> G:\win32metadata\bin\Release\net8.0\MetadataUtils.dll
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
ConstantsScraper -> G:\win32metadata\bin\Release\net8.0\ConstantsScraper.dll
MetadataTasks -> G:\win32metadata\bin\Release\net8.0\MetadataTasks.dll
WinmdUtils -> G:\win32metadata\bin\Release\net8.0\WinmdUtils.dll
ClangSharpSourceToWinmd -> G:\win32metadata\bin\Release\net8.0\ClangSharpSourceToWinmd.dll

Build succeeded.
0 Warning(s)
0 Error(s)

Time Elapsed 00:00:08.09
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet

---

** Visual Studio 2022 Developer PowerShell v17.14.8
** Copyright (c) 2025 Microsoft Corporation

---

*** Creating G:\win32metadata\bin\Windows.Win32.winmd...
Determining projects to restore...
Restored G:\win32metadata\generation\WinSDK\Windows.Win32.proj (in 517 ms).
Scraping headers for crossarch...
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
Audio.DirectMusic:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Audio.DirectMusic.cs..
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ApplicationVerifier:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\ApplicationVerifier.
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AllJoyn:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\AllJoyn.cs...
Audio.DirectSound:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Audio.DirectSound.cs..
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Audio.Apo:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Audio.Apo.cs...
Antimalware:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Antimalware.cs...
AppxPackaging:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\AppxPackaging.cs...
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AppxPackaging:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\AppxPackaging.cs...
Audio.Endpoints:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Audio.Endpoints.cs...
Audio:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\Audio.cs...
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Acquired bearer token using 'MSAL Silent'
[NuGet Manager] [Info] [CredentialProvider]VstsCredentialProvider - Attempting to exchange the bearer token for an Azure DevOps session token.
[NuGet Manager] [Warning] The plugin credential provider could not acquire credentials. Authentication may require manual action. Consider re-running the command with --interactive for dotnet, /p:NuGetInteractive="true" for MSBuild or removing the -NonInteractive switch for NuGet
Audio:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Audio.cs...
Authorization.UI:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Authorization.UI.cs...
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Certificates:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Certificates.cs...
Audio:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Audio.cs...
ClrHosting:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\ClrHosting.cs...
Cabinets:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Cabinets.cs...
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CmpApi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\CmpApi.cs...
Com.CallObj:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Com.CallObj.cs...
Com.ChannelCreds:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Com.ChannelCreds.cs...
Com.Events:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Com.Events.cs...
Com.StructuredStorage:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Com.StructuredStor
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CEIP:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\CEIP.cs...
Com.Urlmon:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Com.Urlmon.cs...
Communication:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Communication.cs...
ComOle:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\ComOle.cs...
CompositionSwapchain:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\CompositionSwapchai
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Controls.RichEdit:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\Controls.RichEdit.cs...
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Cloudapi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Cloudapi.cs...
Debug.ActiveScript:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Debug.ActiveScript.cs
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DeviceAccess:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\DeviceAccess.cs...
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Devices.1394:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Devices.1394.cs...
Devices.Cdrom:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Devices.Cdrom.cs...
Devices.Dvd:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Devices.Dvd.cs...
Devices.Properties:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Devices.Properties.cs
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Controls:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Controls.cs...
Direct2D.Common:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Direct2D.Common.cs...
Devices.Beep:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Devices.Beep.cs...
Direct2D:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Direct2D.cs...
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Direct3D12:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Direct3D12.cs...
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DevInst:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\DevInst.cs...
Direct3D9:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Direct3D9.cs...
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Direct3D:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Direct3D.cs...
Debug.WebApp:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Debug.WebApp.cs...
Dfs:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Dfs.cs...
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DevInst:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\DevInst.cs...
DirectComp:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\DirectComp.cs...
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EapHost:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\EapHost.cs...
Dhcp:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Dhcp.cs...
DlgBox:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\DlgBox.cs...
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Display:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Display.cs...
DirectDraw:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\DirectDraw.cs...
Enstor:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Enstor.cs...
Direct3D9on12:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Direct3D9on12.cs...
DTC:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\DTC.cs...
DXCore:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\DXCore.cs...
Eap:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Eap.cs...
Dxgi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Dxgi.cs...
DlgBox:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\DlgBox.cs...
Etw:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Etw.cs...
FileHistory:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\FileHistory.cs...
Fsrm:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Fsrm.cs...
Display:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Display.cs...
Enclave:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Enclave.cs...
FunctionDiscovery:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\FunctionDiscovery.cs..
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Environment:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Environment.cs...
GamingDvcInfo:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\GamingDvcInfo.cs...
Gpmc:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Gpmc.cs...
HostComputeNetwork:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\HostComputeNetwork.cs
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Dlna:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Dlna.cs...
Fax:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Fax.cs...
HttpServer:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\HttpServer.cs...
Enclave:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Enclave.cs...
Identity:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Identity.cs...
Iis:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Iis.cs...
Fs:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Fs.cs...
Gdiplus:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Gdiplus.cs...
HostComputeSystem:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\HostComputeSystem.cs..
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IndexSrv:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\IndexSrv.cs...
Hid:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\Hid.cs...
Foundation:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Foundation.cs...
Hypervisor:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Hypervisor.cs...
Input.Ime:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Input.Ime.cs...
HtmlHelp:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\HtmlHelp.cs...
ImagingDevice:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\ImagingDevice.cs...
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Intl:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Intl.cs...
Ioctl:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\Ioctl.cs...
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IdentityProvider:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\IdentityProvider.cs...
IMapi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\IMapi.cs...
IScsiDisc:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\IScsiDisc.cs...
Js:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Js.cs...
InternetConnectionWizard:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\InternetConnect
ionWizard.cs...
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GameInput:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\GameInput.cs...
Ioctl:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Ioctl.cs...
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MachineLearning:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MachineLearning.cs...
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MadCap:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MadCap.cs...
InternetExplorer:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\InternetExplorer.cs...
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GameMode:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\GameMode.cs...
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LibraryLoader:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\LibraryLoader.cs...
Mbn:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Mbn.cs...
MagApi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MagApi.cs...
Media.DShow:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Media.DShow.cs...
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KeyboardAndMouseInput:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\KeyboardAndMouseIn
put.cs...
IO:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\IO.cs...
MdmReg:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MdmReg.cs...
MsChap:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MsChap.cs...
Mapi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Mapi.cs...
Js:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\Js.cs...
MenuRc:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\MenuRc.cs...
MsTv:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MsTv.cs...
Media.DShow.Xml:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Media.DShow.Xml.cs...
IpHlp:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\IpHlp.cs...
Mmc:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Mmc.cs...
MsCs:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MsCs.cs...
Multimedia:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Multimedia.cs...
NetworkAccessProtection:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\NetworkAccessPro
tection.cs...
MenuRc:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\MenuRc.cs...
IScsiDisc:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\IScsiDisc.cs...
Nfp:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Nfp.cs...
NWifi:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\NWifi.cs...
Nfc:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Nfc.cs...
Monitor:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Monitor.cs...
Media.KernelStreaming:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\Media.KernelStreaming.cs
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Nla:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Nla.cs...
MsHtml:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\MsHtml.cs...
OpenGL:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\OpenGL.cs...
Pipes:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Pipes.cs...
Ndf:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Ndf.cs...
Power:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Power.cs...
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PrintTicket:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\PrintTicket.cs...
Nps:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Nps.cs...
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Ndis:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Ndis.cs...
Opc:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Opc.cs...
Proc_Snap:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Proc_Snap.cs...
Properties:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Properties.cs...
Policy:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Policy.cs...
ProjFs:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\ProjFs.cs...
Media.KernelStreaming:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\Media.KernelStreamin
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Parcon:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Parcon.cs...
NetBios:x86 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x86\NetBios.cs...
Rpc:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Rpc.cs...
Security.AppLocker:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.AppLocker.cs
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NetBios:x64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\x64\NetBios.cs...
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Security.ConfigurationSnapin:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.Co
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NetBios:arm64 - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\arm64\NetBios.cs...
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NetMgmt:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\NetMgmt.cs...
Security.Cryptography.Sip:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.Crypt
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PWM:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\PWM.cs...
Registry:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Registry.cs...
Media:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Media.cs...
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NetShell:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\NetShell.cs...
RemoteAssist:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\RemoteAssist.cs...
Security.Cryptography.UI:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.Crypto
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Security.WinWlx:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.WinWlx.cs...
Media.DxMediaObjects:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Media.DxMediaObject
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PicAcq:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\PicAcq.cs...
Security:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\Security.cs...
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WebServicesOnDevices:common - Scanning to G:\win32metadata\generation\WinSDK\obj\generated\common\WebServicesOnDevice
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[riverar]

Hmm, after replacing the Win32Metadata feed in nuget.config with <add key="NuGet" value="https://api.nuget.org/v3/index.json" /> and ran the script, it completed in 6-7 minutes.

[morganbr]

I found the issues here:

1. The hang was due to a massive number of errors in the compilation. Roslyn ends up creating hundreds of worker threads that do a ton of allocation and contend with each other.
2. The "Looking for compilation errors" task enumerating compilation diags doesn't seem to be necessary because the generator will also identify errors on its own without taking forever to do it -- the way I was able to figure out what was going on was to comment it out.
3. The root cause of the errors was related to Add NativeAnnotationAttribute to the metadata file #2001 -- I turned out to have clangsharppinvokegenerator 18 installed (no idea why, I think I've only used it for this repo) and it was generating a ton of NativeAnnotationAttributes that didn't compile. Downgrading to 17 removed the attributes.