Can't set <PublishAot> in the .csproj file with multiple TargetFrameworks

[felixf4xu]

Current behavior

In a Uno project with multiple TargetFrameworks, I can't set <PublishAot> to enable AOT, the error message is:

error NETSDK1203: Ahead-of-time compilation is not supported for the target runtime identifier 'browser-wasm'.

Expected behavior

Standard AOT configurations should be able to use in Uno project file, like:

      <PublishTrimmed>true</PublishTrimmed>
      <PublishAot>true</PublishAot>
      <PublishSingleFile>true</PublishSingleFile>

How to reproduce it (as minimally and precisely as possible)

A project file with multiple TargetFrameworks:

<TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst;net9.0-windows10.0.26100;net9.0-browserwasm;net9.0-desktop</TargetFrameworks>

Add these configurations into the .csproj file

      <PublishTrimmed>true</PublishTrimmed>
      <PublishAot>true</PublishAot>
      <PublishSingleFile>true</PublishSingleFile>

then run dotnet publish -f net9.0-desktop

Workaround

I have to remove net9.0-browserwasm from the <TargetFrameworks> temporarily to run:

dotnet publish -f net9.0-desktop

Works on UWP/WinUI

None

Environment

No response

NuGet package version(s)

No response

Affected platforms

No response

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

Same error on Ubuntu if only dotnet publish -f net9.0-desktop is used (no VS publish)

[jeromelaban]

Thanks for the report. .NET WebAssembly does not support AOT to be set this way, so does .NET Android.

If you want to use those properties, you'll need to set them in a TFM conditional way, as such:

<PropertyGroup Condition=" '$(TargetFramework)' == 'net9.0-desktop' ">
      <PublishTrimmed>true</PublishTrimmed>
      <PublishAot>true</PublishAot>
      <PublishSingleFile>true</PublishSingleFile>
</PropertyGroup>

Note that single file publishing is not yet fully supported by Uno, particularly on Windows.