Enable building NativeAOT for Apple mobile platforms

[ivanpovazan]

Description

dotnet/runtime currently does not support building NativeAOT subset (framework, SDK libraries and tools) for iOS platforms. Additionally, building an appropriate runtime NuGet package for these platforms is also unavailable.

Enable building NativeAOT subset and creating matching runtime NuGet packages for the following set of platforms (target operating system and architecture combinations):

• iOS/tvOS (arm64)
• iOS/tvOS Simulator (x64, arm64)
• MacCatalyst (x64, arm64)

The feature should be conditionally included by introducing appropriate preprocessor directives

Remaining tasks:

• Enable building the NativeAOT runtime - Enable building NativeAOT for Apple mobile platforms #81780
• Fix NativeAOT ICU build integration for Apple mobile platforms  #82389
• HelloiOS sample for NativeAOT #80911
• Add runtime packs for the platforms - Add NativeAOT runtime pack build for iOS/tvOS/Catalyst #85047

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Issue Details

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Author:	ivanpovazan
Assignees:	-
Labels:	untriaged, area-NativeAOT-coreclr
Milestone:	-

[ghost]

Tagging subscribers to 'os-ios': @steveisok, @akoeplinger
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Issue Details

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Description

dotnet/runtime currently does not support building NativeAOT subset (framework, SDK libraries and tools) for iOS platforms. Additionally, building an appropriate runtime NuGet package for these platforms is also unavailable.

Proposal

Enable building NativeAOT subset and creating matching runtime NuGet packages for the following set of platforms (target operating system and architecture combinations):
- ios-arm64
- ios-x64
- iossimulator-arm64
- iossimulator-x64

The feature should be conditionally included by introducing appropriate preprocessor directives

Author:	ivanpovazan
Assignees:	-
Labels:	os-ios, area-NativeAOT-coreclr
Milestone:	-

[ivanpovazan]

@akoeplinger
I was going through the tasks, listed in the issue description, and had a question regarding:

[ ] Properly implement targeting these platforms rather than pretending to be macOS

Were you referring to this workaround (and what is brings along):

runtime/src/coreclr/tools/Common/JitInterface/CorInfoImpl.cs

Line 3066 in 8f19f4e

target.IsOSXLike ? CORINFO_OS.CORINFO_MACOS : CORINFO_OS.CORINFO_UNIX;

[akoeplinger]

@ivanpovazan yes, and that also has corresponding implications on the native side. When I initially tried this I was getting asserts in the ILCompiler so we'll probably need a bit of help from the NativeAOT side.

[ivanpovazan]

The remaining task:

• Properly implement targeting these platforms rather than pretending to be macOS

is moved and tracked separately in the top-level tracking issue as it is identified as an improvement.

Closing this issue as all other tasks are completed.