How to fix the error: clang exited with code 1

By default .NET Meteor uses the runtime identifier that match your PC architecture (iossimulator-arm64 - for Mac with Apple chip, iossimulator-x64 - for Mac with Intel chip). If you want to change this behavior, you can do the following:

1. Create the .vscode/tasks.json file with the following content:

{
    "version": "2.0.0",
    "tasks": [
        {
            "type": "dotnet-meteor.task",
            "target": "build",
            "label": "Build without runtimeId",
	    "args": [
                // It removes auto provided value
                "-p:RuntimeIdentifier="
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

You can leave the -p:RuntimeIdentifier= property empty or specify your custom value (for example: -p:RuntimeIdentifier=iossimulator-x64).

2. Create or edit the .vscode/launch.json file:

{
    "version": "0.2.0",
    "configurations": [
        {
            // Default configuration
            "name": ".NET Meteor Debugger",
            "type": "dotnet-meteor.debugger",
            "request": "launch",
            "preLaunchTask": "dotnet-meteor: Build",
        },
        {
            // Your new configuration for iossimulator-x64 only
            "name": "(simX64) .NET Meteor Debugger",
            "type": "dotnet-meteor.debugger",
            "request": "launch",
            // You can specify path to the application here
            "program": "${workspaceFolder}/bin/Debug/net8.0-ios/iossimulator-x64/MyMauiApplication.app",
            // This label should be the same as in the tasks.json file
            "preLaunchTask": "Build without runtimeId",
        }
    ]
}

3. Now you can select this new configuration in the VSCode debug window and run your application.

---

Additional info

You can also change your device settings instead of specifying program property in the launch.json. For example:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(simX64) .NET Meteor Debugger",
            "type": "dotnet-meteor.debugger",
            "request": "launch",
            "device": {
                "serial": "${command:dotnet-meteor.activeDeviceSerial}",
                "runtime_id": "iossimulator-x64",
                "platform": "ios",
                "is_emulator": true,
            },
            "preLaunchTask": "Build without runtimeId"
        }
    ]
}

The command dotnet-meteor.activeDeviceSerial contains a serial number of the selected device in the status bar. For additonal properties, see device.ts file.