Use 'managed-static' as the new default registrar

[ivanpovazan]

Description

This PR sets the default registrar to be managed-static for the following platforms and build configurations:

• ios and tvos device builds in Debug and Release configurations
• macOS and MacCatalyst builds in Release configuration

This is accomplished by moving the registrar selection logic from custom linker steps (dotnet-linker) into the SDK.
Legacy code still has appropriate SelectRegistrar methods.

App size implications

Using managed-static registrar increases the dotnet new maui app on iOS by ~2-3%.

Tested with dotnet 9.0.100-preview.2.24119.3

dotnet new maui (LinkMode=SdkOnly)	static	managed-static	diff (%)
Size on disk (MB)	39,20	40,29	2,79%
Size zipped (MB)	14,52	14,80	1,92%

dotnet new maui (LinkMode=Full)	static	managed-static	diff (%)
Size on disk (MB)	29,93	30,88	3,18%
Size zipped (MB)	11,20	11,47	2,37%

---

Fixes #19769

[ivanpovazan]

@rolfbjarne not sure what to do about test.ProjectPlatform=iPhone in

xamarin-macios/tests/xharness/Jenkins/TestVariationsFactory.cs

Line 28 in e96bf83

IEnumerable<TestData> GetTestData (RunTestTask test)

as if I understand correctly we don't run tests on devices on the CI, but still the code adds different variants which would now be configured for a different default registrar and not sure how I would verify the changes.
Do you have any suggestions?

With that in mind, should we just trust ios/tvos simulators tests testing MSR and the regular static registrar support?

[rolfbjarne]

I think this looks really good now! Just a couple of really minor things left (and there's a conflict to resolve too).

[ivanpovazan]

Not sure what the exact problem is on CI, but I suppose some issue with version dependencies.
The error message:

/Users/builder/azdo/_work/1/s/xamarin-macios/builds/downloads/dotnet-sdk-9.0.100-preview.3.24129.4/sdk/9.0.100-preview.3.24129.4/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(117,5): error NETSDK1139: The target platform identifier iOS was not recognized. [/Users/builder/azdo/_work/1/s/xamarin-macios/msbuild/Xamarin.HotRestart.PreBuilt/Xamarin.PreBuilt.iOS/Xamarin.PreBuilt.iOS.csproj]

I did merge in the latest net9.0 branch changes, but this could be something new.

[rolfbjarne]

Not sure what the exact problem is on CI, but I suppose some issue with version dependencies. The error message:

/Users/builder/azdo/_work/1/s/xamarin-macios/builds/downloads/dotnet-sdk-9.0.100-preview.3.24129.4/sdk/9.0.100-preview.3.24129.4/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(117,5): error NETSDK1139: The target platform identifier iOS was not recognized. [/Users/builder/azdo/_work/1/s/xamarin-macios/msbuild/Xamarin.HotRestart.PreBuilt/Xamarin.PreBuilt.iOS/Xamarin.PreBuilt.iOS.csproj]

I did merge in the latest net9.0 branch changes, but this could be something new.

Your xml is wrong:

NoImport: /Users/builder/azdo/_work/1/s/xamarin-macios/builds/downloads/dotnet-sdk-9.0.100-preview.3.24129.4/packs/Microsoft.iOS.Sdk.net9.0_17.2/17.2.9342-ci.pr.gh20174/targets/Xamarin.Shared.Sdk.targets at (3;3) invalid file

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✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

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[ivanpovazan]

Thanks a lot, I made a typo in the targets file and somehow thought I tested it properly locally - which did not seem to be the case.