[UWP] F# code usage fails Azure DevOps build

[xperiandri]

According to dotnet/corert#6055 UWP apps referencing F# library must build.
But they are not.

Unless I execute

foreach ($file in gci -Recurse 'C:\Users\*\.nuget\packages\*.net.native.compiler\**\GatekeeperConfig.xml')
{
    (gc $file.FullName) -replace '<FSharpRule on="true">','<FSharpRule on="false">' | sc $file.FullName
}

build fails.
But this hack works only for Microsoft.NETCore.UniversalWindowsPlatform with version less than current, i.e. less than 6.2.12

And for current it fails

BuildNativePackage:
  Creating ilc response file "obj\x64\Release\ilc.SuperCharge.Mobile.UWP.rsp" with the following content: /in:"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\in" /out:"D:\a\1\b\AppStore\x64\ilc" /intermediatespath:"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\intermediate" /v:normal /keepintermediates:true /buildtype:ret /exename:"SuperCharge.Mobile.UWP.exe" /rcpath:"C:\Program Files %28x86%29\Windows Kits\10\bin\10.0.19041.0\x64\rc.exe" /targetplatformsdklibpath:"C:\Program Files %28x86%29\Windows Kits\10\lib\10.0.19041.0\um" /WindowsSdkApiXml:"C:\Program Files %28x86%29\Windows Kits\10\bin\10.0.19041.0\x64\PInvoke\SupportedAPIs.xml" /targetplatformsdkmetadatapath:"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\in\WinMetadata" /RdXmlPath:"C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\LibraryXML" /CscPath:"C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\csc\csc.exe" /suppressPDBWarnings:true /AllowNoManagedCode /frameworkDependency:"Name = Microsoft.UI.Xaml.2.5, MinVersion = 2.52012.2002.0, Publisher = 'CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US'" /frameworkDependency:"Name = Microsoft.NET.Native.Framework.2.2, MinVersion = 2.2.29512.0, Publisher = 'CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US'" /frameworkDependency:"Name = Microsoft.NET.Native.Runtime.2.2, MinVersion = 2.2.28604.0, Publisher = 'CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US'"  /UseSharedAssemblies /InSharedAssemblyPath:"C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.microsoft.net.native.sharedlibrary\2.2.8-rel-29722-00\build\..\tools\SharedLibrary" /TargetPlatform:x64
  C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.microsoft.net.native.compiler\2.2.10-rel-29722-00\build\..\tools\\x64\ilc\ilc.exe @"obj\x64\Release\ilc.SuperCharge.Mobile.UWP.rsp" "/logger:CsvLogger;2584;2308" 
  Launching 'C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\x64\ilc\ilc.exe --gatekeeper @"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\intermediate\gkargs.rsp"'
##[error]C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\Microsoft.NetNative.targets(805,5): Error : ILT0005: 'C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\x64\ilc\ilc.exe --gatekeeper @"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\intermediate\gkargs.rsp"' returned exit code 1
C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\Microsoft.NetNative.targets(805,5): error : ILT0005: 'C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\runtime.win10-x64.microsoft.net.native.compiler\2.2.10-rel-29722-00\tools\x64\ilc\ilc.exe --gatekeeper @"D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\obj\x64\Release\ilc\intermediate\gkargs.rsp"' returned exit code 1 [D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\SuperCharge.Mobile.UWP.csproj]
Done Building Project "D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\SuperCharge.Mobile.UWP.csproj" (Build target(s)) -- FAILED.
Done Building Project "D:\a\1\s\Mobile\SuperCharge.Mobile.UWP\SuperCharge.Mobile.UWP.csproj" (default targets) -- FAILED.

Because I have not write access to C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[tommcdon]

Hi @xperiandri, thanks for posting this issue. .NET Native ships as a Nuget package. It seems that the AzDO script assumed it was restored to the local nuget package folder. As a performance optimization VS ships the latest .NET native package in the off-line nuget cache. This enables the project creation scenario with File->New C# UWP without needing to download the .NET native toolchain. Unfortunately Program Files is read-only, and unless the script has write access to that folder, it will not be able to update the gatekeeper xml. As I am sure you aware, F# is not an officially supported scenario hence it is disabled by default.

[xperiandri]

So what is next? What does closing this issue mean?

[tommcdon]

So what is next? What does closing this issue mean?

.NET native does not officially support F# scenarios