Lack Support for ARM64EC Build

[EternalARK]

Describe the bug

Cannot build WinUI3 apps with ARM64EC build. Unable to open "packages\Microsoft.WindowsAppSDK.1.5.240607001\build\native....\lib\native\win10-ARM64EC\Microsoft.UI.Dispatching.lib”

Steps to reproduce the bug

1. Create New Black WinUI3 app
2. add #include <winrt/Microsoft.UI.Dispatching.h> into pch.h
3. Compile with ARM64EC

Expected behavior

Failed to build when searching for lib file.

Screenshots

No response

NuGet package version

Windows App SDK 1.5.4: 1.5.240607001

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

No response

[jeffstall]

I'll take this for now for tracking.

[ssparach]

Thanks for raising this issue! Following your repro steps with Windows App SDK version 1.8.251003001, I was able to build for ARM64EC. Could you confirm if this still occurs on your side?

[microsoft-github-policy-service[bot]]

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 7 days. It will be closed if no further activity occurs within 7 days of this comment.