Compiling on m1 arm64 yields x64 app

[YVbakker]

Description

When starting a new project as described in the installation manual, upon executing dotnet build -t:Run -f net6.0-maccatalyst an application spins up. Upon closer inspection, this seems to be an x86_64 executable.

Running dotnet build -t:Run -f net6.0-maccatalyst --use-current-runtime or dotnet build -t:Run -f net6.0-maccatalyst -r osx.12-arm64 (rid obtained from: https://docs.microsoft.com/en-us/dotnet/core/rid-catalog#macos-rids) produces an error message:

/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/15.2.200-preview.12.4/targets/Xamarin.Shared.Sdk.targets(1233,3): error : The RuntimeIdentifier 'osx-arm64' is invalid. [/Users/yvbakker/Development/maui-preview-12/MyMauiApp/MyMauiApp.csproj]

respectively

/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/15.2.200-preview.12.4/targets/Xamarin.Shared.Sdk.targets(1233,3): error : The RuntimeIdentifier 'osx.12-arm64' is invalid. [/Users/yvbakker/Development/maui-preview-12/MyMauiApp/MyMauiApp.csproj]

While maui is usable on the latest macos with an m1 chip, the fact that it's producing a non-native application by default does have a performance / time penalty which significantly slows the development process. I am aware that this framework is currently very experimental, and I'm using it only in this context.

Steps to Reproduce

1. On macos 12, with an m1 chip (arm64), run dotnet new maui -n "MyMauiApp"
2. Run dotnet build -t:Run -f net6.0-maccatalyst
3. Inspect the running application with Activity Monitor or observe the output MyMauiApp -> /.../MyMauiApp/bin/Debug/net6.0-maccatalyst/maccatalyst-x64/MyMauiApp.dll

Version with bug

Preview 12 (current)

Last version that worked well

Unknown/Other

Affected platforms

macOS

Affected platform versions

MacOS 12.2

Did you find any workaround?

Compiling (by default) for x64 works fine, it launches through rosetta.

Relevant log output

No response

[gdar91]

Install rosetta 2 and try running it in release mode dotnet build -t:Run -f net6.0-maccatalyst -c Release. Hope we get native M1 support very soon.

[YVbakker]

Install rosetta 2 and try running it in release mode dotnet build -t:Run -f net6.0-maccatalyst -c Release. Hope we get native M1 support very soon.

I have rosetta 2 installed, and it runs just fine, thank you though. This issue is about the fact that there is no native executable produced even though the target is available (it seems). So far I haven't been able to configure the compiler to use this target.

[kristinx0211]

installed rosetta 2, Maui project can be build and run succeeded on m1 mac.

[Redth]

@rolfbjarne is this perhaps due to incorrect RID defaults being assumed? This might be fixed already?

[rolfbjarne]

We always default to maccatalyst-x64 as the RID for Mac Catalyst (and macOS), we don't look at the host OS.

This is to get predictable behavior between machines: one scenario we had in mind was CI machines, when you might add a new machine to your pool of machines, and most people wouldn't expect the resulting app to change.

If you want to build for ARM64, you have to specify the maccatalyst-arm64 RID.

Due to a different bug, that's not trivial for MAUI projects (dotnet/sdk#21877), but you can always set it in the csproj:

<PropertyGroup Condition="'$(TargetFramework)' == 'net6.0-maccatalyst'">
    <RuntimeIdentifier>maccatalyst-arm64</RuntimeIdentifier>
</PropertyGroup>

[Redth]

I suppose that as long as the ide infers an appropriate rid based on the host it makes sense to keep the x64 default for Cli.