Review Apple architectures (add x64_64 slices for all simulators?)

[shirakaba]

Background

Running cmake-rn --apple produces the following files:

build
└── Release
    └── sum.apple.node
        ├── ios-arm64
        ├── ios-arm64-simulator
        ├── macos-arm64_x86_64
        ├── tvos-arm64
        ├── tvos-arm64-simulator
        ├── xros-arm64
        ├── xros-arm64-simulator
        ├── Info.plist
        └── react-native-node-api-module

You can review the architectures like this:

lipo -info build/arm64-apple-ios-sim/out/Release/sum.framework/sum
Non-fat file: build/arm64-apple-ios-sim/out/Release/sum.framework/sum is architecture: arm64

At the code level, the architectures are determined here:

react-native-node-api/packages/cmake-rn/src/platforms/apple.ts

Lines 57 to 68 in 8557768

	export const APPLE_ARCHITECTURES = {
	"x86_64-apple-darwin": "x86_64",
	"arm64-apple-darwin": "arm64",
	"arm64;x86_64-apple-darwin": "arm64;x86_64",
	"arm64-apple-ios": "arm64",
	"arm64-apple-ios-sim": "arm64",
	"arm64-apple-tvos": "arm64",
	// "x86_64-apple-tvos": "x86_64",
	"arm64-apple-tvos-sim": "arm64",
	"arm64-apple-visionos": "arm64",
	"arm64-apple-visionos-sim": "arm64",
	} satisfies Record<Target, AppleArchitecture>;

Issue

I noticed that, for all the simulators, we only build arm64. Shouldn't we build the x86_64 slice as well so that Intel Macs can develop for simulator?

[kraenhansen]

For context: I started this list in the context of Ferric and the missing x86_64 iOS simulator and I actually thought this was not a triplet supported by the Rust compiler ... but it turns out the triplet just has a really bad name 🙃

As per documentation:

x86_64-apple-ios: Apple iOS Simulator on 64-bit x86.