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[Xamarin.Android.Build.Tasks] introduce $(_AndroidRuntime) property #9686

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Context: #9572 (comment)
Context: https://github.com/xamarin/xamarin-macios/blob/2009c571aa8a975ab0e0b1785e5484dbd64d6f9b/dotnet/targets/Xamarin.Shared.Sdk.targets#L1004-L1006

To align with xamarin/xamarin-macios, the following public MSBuild properties can be used to select a runtime for iOS, macOS, etc.:

  • $(UseMonoRuntime)=true: MonoVM
  • $(UseMonoRuntime)=false: CoreCLR
  • $(PublishAot)=true: NativeAOT
  • Defaults if blank, select MonoVM

Introduce a private $(_AndroidRuntime) property we can use throughout our build to know which runtime is being targetted.

This way, if a new property is designed in the future, we can keep using $(_AndroidRuntime) and simply update the defaults.

Context: #9572 (comment)
Context: https://github.com/xamarin/xamarin-macios/blob/2009c571aa8a975ab0e0b1785e5484dbd64d6f9b/dotnet/targets/Xamarin.Shared.Sdk.targets#L1004-L1006

To align with xamarin/xamarin-macios, the following public MSBuild
properties can be used to select a runtime for iOS, macOS, etc.:

* `$(UseMonoRuntime)=true`: MonoVM
* `$(UseMonoRuntime)=false`: CoreCLR
* `$(PublishAot)=true`: NativeAOT
* Defaults if blank, select MonoVM

Introduce a private `$(_AndroidRuntime)` property we can use
throughout our build to know which runtime is being targetted.

This way, if a new property is designed in the future, we can keep
using `$(_AndroidRuntime)` and simply update the defaults.
@jonathanpeppers jonathanpeppers marked this pull request as ready for review January 15, 2025 19:36
@@ -296,8 +297,8 @@ Dictionary<string, ITaskItem> MaybeGetArchAssemblies (Dictionary<AndroidTargetAr

void GenerateAdditionalProviderSources (NativeCodeGenState codeGenState, IList<string> additionalProviders)
{
if (NativeAot) {
Log.LogDebugMessage ("Skipping MonoRuntimeProvider generation for NativeAot");
if (!string.Equals (AndroidRuntime, "MonoVM", StringComparison.OrdinalIgnoreCase)) {
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For forward compatibility, I would add an enum in XABT which contains the supported targets and a helper method in MonoAndroidHelper to parse strings and return the correct enum value.

Also, I think it would be a good idea to make MonoVM, CoreCLR and NativeAOT const string members in some class (KnownRuntimes?)

Together, the two changes would minimize potential for mistakes in code.

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I'll add a helper/enum for C#.

grendello added a commit that referenced this pull request Jan 16, 2025
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It seems that, at least right now, we cannot use UseMonoRuntime because it causes build problems because of this code.

Setting UseMonoRuntime=true when building an Android app results in:

XAPerfTest.csproj : error NU1101: Unable to find package Microsoft.NETCore.App.Runtime.linux-bionic-x86. No packages exist with this id in source(s): darc-pub-dotnet-emsdk-91b783e, darc-pub-dotnet-runtime-ef07c4f, dotnet-eng, dotnet-public, dotnet-tools, dotnet10, dotnet10-transport, dotnet9, dotnet9-transport, xamarin.android util
XAPerfTest.csproj : error NU1101: Unable to find package Microsoft.NETCore.App.Runtime.linux-bionic-arm. No packages exist with this id in source(s): darc-pub-dotnet-emsdk-91b783e, darc-pub-dotnet-runtime-ef07c4f, dotnet-eng, dotnet-public, dotnet-tools, dotnet10, dotnet10-transport, dotnet9, dotnet9-transport, xamarin.android util

@jonathanpeppers
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It seems that, at least right now, we cannot use UseMonoRuntime because it causes build problems because of this code.

Setting UseMonoRuntime=true when building an Android app results in:

XAPerfTest.csproj : error NU1101: Unable to find package Microsoft.NETCore.App.Runtime.linux-bionic-x86. No packages exist with this id in source(s): darc-pub-dotnet-emsdk-91b783e, darc-pub-dotnet-runtime-ef07c4f, dotnet-eng, dotnet-public, dotnet-tools, dotnet10, dotnet10-transport, dotnet9, dotnet9-transport, xamarin.android util
XAPerfTest.csproj : error NU1101: Unable to find package Microsoft.NETCore.App.Runtime.linux-bionic-arm. No packages exist with this id in source(s): darc-pub-dotnet-emsdk-91b783e, darc-pub-dotnet-runtime-ef07c4f, dotnet-eng, dotnet-public, dotnet-tools, dotnet10, dotnet10-transport, dotnet9, dotnet9-transport, xamarin.android util

UseMonoRuntime=true is the default for all Android projects today, and nothing will work without it. I suspect the failure above is related to something else.

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