NativeAOT: Enable building app extensions with NativeAOT

[ivanpovazan]

Description

This PR enables building app extensions with NativeAOT.

App extensions are class libraries and to build them with NativeAOT we must not specify CustomNativeMain=true. If we do, ILC would expect that the input assembly has a managed Main as the module entry point.

Additionally, when building class libraries (with the absence of a managed Main entry point), our static reference from:

xamarin-macios/runtime/nativeaot-bridge.m

Line 39 in 2e5ef1e

return __managed__Main (argc, argv);

requires build-time symbol resolution. To avoid linking errors, we generate an empty __managed__Main
in the native bootstrapping code of the app extension (e.g., in main.arm64.mm).

Testing

The unit tests have been introduced to test building app extensions with both Mono and NativeAOT.
Executing an iOS app TodayExtension built with NativeAOT has been verified manually on an actual device.

---

Fixes: #20653

[github-actions]

⚠️ Your code has been reformatted. ⚠️

If this is not desired, add the actions-disable-autoformat label, and revert the reformatting commit.

If files unrelated to your change were modified, try reverting the reformatting commit + merging with the target branch (and push those changes).

[rolfbjarne]

Does it work with universal apps?

Suggested change

	[TestCase (ApplePlatform.MacOSX, "osx-x64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", true)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", true)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64;osx-arm64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64;osx-arm64", true)]

[ivanpovazan]

It does not work with the universal apps.
In fact, I discovered that we have a more general issue when building universal apps with NativeAOT and opened: #20903 about it.
For now, I commented out universal app extension tests with NativeAOT.

[rolfbjarne]

Does it work with universal apps?

Suggested change

	[TestCase (ApplePlatform.MacOSX, "osx-x64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", true)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64", true)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64;osx-arm64", false)]
	[TestCase (ApplePlatform.MacOSX, "osx-x64;osx-arm64", true)]

[vs-mobiletools-engineering-service2]

📚 [CI Build] Artifacts 📚

Packages generated

View packages

• xamarin.ios-17.5.0.202.pkg
• xamarin.mac-9.5.0.202.pkg

Pipeline on Agent
Hash: [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build] Tests on macOS X64 - Mac Sonoma (14) passed 💻

✅ All tests on macOS X64 - Mac Sonoma (14) passed.

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build] Tests on macOS M1 - Mac Monterey (12) passed 💻

✅ All tests on macOS M1 - Mac Monterey (12) passed.

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build] Tests on macOS M1 - Mac Ventura (13) passed 💻

✅ All tests on macOS M1 - Mac Ventura (13) passed.

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]

[ivanpovazan]

@mandel-macaque @dalexsoto
could you please take a look?

Regarding Rolf's comment about including universal app extensions tests with NativeAOT I opened: #20903 for tracking as we don't seem to properly support building regular universal apps with NativeAOT either.

[vs-mobiletools-engineering-service2]

❌ [CI Build] Windows Integration Tests failed ❌

❌ Failed ❌

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 170 tests passed 🎉

Tests counts

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 6 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 7 tests passed. Html Report (VSDrops) Download
✅ generator: All 2 tests passed. Html Report (VSDrops) Download
✅ install-source: All 1 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 7 tests passed. Html Report (VSDrops) Download
✅ introspection: All 8 tests passed. Html Report (VSDrops) Download
✅ linker: All 65 tests passed. Html Report (VSDrops) Download
✅ mac-binding-project: All 1 tests passed. Html Report (VSDrops) Download
✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
✅ mononative: All 6 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (watchOS): All 4 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ mtouch: All 1 tests passed. Html Report (VSDrops) Download
✅ xammac: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 8 tests passed. Html Report (VSDrops) Download
✅ xtro: All 2 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build] Windows Integration Tests passed 💻

✅ All Windows Integration Tests passed.

Pipeline on Agent
Hash: 1f368ca80e33545981dc37e5175e858ac2c197af [PR build]