[release/8.0.1xx] [dotnet] Complete support for universal builds when…

… using NativeAOT. (#19214)

We couldn't do universal builds using NativeAOT, because .NET had a sanity
check that was a bit too eager and caused unnecessary build failures. We've
now been able to add an escape hatch to that sanity check, so let's use it.

This makes universal builds using NativeAOT work, so we can also enable/add
corresponding test variations in xharness.

Also ask the runtime to allow SelfContained without a RuntimeIdentifier (the
runtime has an overeager sanity check that doesn't apply to us, so we must
skip it). Fixes #19142.

Fixes #19142.
Fixes #19206.

Backport of #19183

dotnet/targets/Xamarin.Shared.Sdk.props

@@ -95,6 +95,10 @@
 
 		<!-- Enable the reflection-based json serializer by default. Ref: https://github.com/xamarin/xamarin-macios/issues/18057 -->
 		<JsonSerializerIsReflectionEnabledByDefault Condition="'$(JsonSerializerIsReflectionEnabledByDefault)' == ''">true</JsonSerializerIsReflectionEnabledByDefault>
+
+		<!-- Tell .NET to skip sanity checks that trigger too eagerly for builds with multiple RuntimeIdentifiers -->
+		<AllowPublishAotWithoutRuntimeIdentifier Condition="'$(AllowPublishAotWithoutRuntimeIdentifier)' == '' And '$(_UseNativeAot)' == 'true'">true</AllowPublishAotWithoutRuntimeIdentifier>
+		<AllowSelfContainedWithoutRuntimeIdentifier Condition="'$(AllowSelfContainedWithoutRuntimeIdentifier)' == ''">true</AllowSelfContainedWithoutRuntimeIdentifier>
 	</PropertyGroup>
 
 	<!-- Set the default RuntimeIdentifier if not already specified. -->

tests/xharness/Jenkins/TestVariationsFactory.cs

@@ -175,17 +175,13 @@ IEnumerable<TestData> GetTestData (RunTestTask test)
 						if (test.Platform == TestPlatform.MacCatalyst) {
 							yield return new TestData { Variation = "Release (ARM64, LLVM)", Debug = false, UseLlvm = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst) || !mac_supports_arm64, RuntimeIdentifier = arm64_runtime_identifier };
 							yield return new TestData { Variation = "Release", Debug = false, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst) };
-							// Pending: We need to skip this consistency check to support universal apps:
-							// https://github.com/dotnet/sdk/blob/f90e558092ac61038ffa1017fe3a5aca1af5ae7e/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.RuntimeIdentifierInference.targets#L224-L226
-							// because the outer build has PublishAot=true and no RuntimeIdentifier set.
-							// Filed as https://github.com/dotnet/sdk/issues/33414.
-							// yield return new TestData { Variation = "Release (NativeAOT)", Debug = false, PublishAot = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst), Defines = "NATIVEAOT", LinkMode = "Full" };
-
+							yield return new TestData { Variation = "Release (NativeAOT)", Debug = false, PublishAot = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst), Defines = "NATIVEAOT", LinkMode = "Full" };
 							yield return new TestData { Variation = "Release (NativeAOT, ARM64)", Debug = false, PublishAot = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst) || !mac_supports_arm64, Defines = "NATIVEAOT", RuntimeIdentifier = arm64_runtime_identifier, LinkMode = "Full" };
 							yield return new TestData { Variation = "Release (NativeAOT, x64)", Debug = false, PublishAot = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.MacCatalyst), Defines = "NATIVEAOT", LinkMode = "Full", RuntimeIdentifier = x64_runtime_identifier };
 						}
 						if (test.Platform == TestPlatform.Mac) {
 							yield return new TestData { Variation = "Release", Debug = false, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.Mac) };
+							yield return new TestData { Variation = "Release (NativeAOT)", Debug = false, PublishAot = true, Ignored = !jenkins.TestSelection.IsEnabled (TestLabel.Monotouch) || !jenkins.TestSelection.IsEnabled (PlatformLabel.Mac), Defines = "NATIVEAOT", LinkMode = "Full" };
 						}
 						if (test.TestProject.IsDotNetProject) {
 							yield return new TestData { Variation = "Release (all optimizations)", BundlerArguments = "--optimize:all", Registrar = "static", Debug = false, Profiling = false, LinkMode = "Full", Defines = "OPTIMIZEALL", Ignored = ignore };