gist:60c945b92fbe60a0fecaa0143c35c4af

## gistfile1.txt
Prerequisites:

- rustup target install x86_64-apple-ios

Steps:

DOCUMENTATION ON COMPILING FOR IOS SIMULATOR

1) Create a shim to the cross-compiling linker for the simulator:

xcrun --sdk iphonesimulator --show-sdk-path

  a) With the given path, create a shim called `linker_shim.sh`:

  #!/bin/sh
  cc -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.2.sdk "$@"

  b) Make it executable:

  chmod 777 linker_shim.sh

2) Set an environment variable so that cargo doesn't use the default linker:

export CARGO_TARGET_X86_64_APPLE_IOS_LINKER=~/<path>/linker_shim.sh

3) Compile tests:

cargo test --no-run --target=x86_64-apple-ios

4) Wrap as an app:

	a) Copy executable to a separate empty directory.

  mkdir app
	cp target/x86_64-apple-ios/debug/hello-a254f99d8b1ee1bc app/hello

	b) Create an Info.plist file with the following contents:

  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
    <dict>
      <key>CFBundleExecutable</key>
      <string>hello</string>
      <key>CFBundleIdentifier</key>
      <string>com.rust.tests</string>
      <key>UIRequiredDeviceCapabilities</key>
      <array>
        <string>x86_64</string>
      </array>
    </dict>
  </plist>

5) Start the iOS simulator:

open /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app

6) Install app:

xcrun simctl install booted app/

7) Running the app and seeing output.

There are several alternatives here. Since we're running on the simulator, we can just do this:

xcrun simctl launch --console booted com.rust.tests

We could also use LLDB:

Get the path of the app on the simulator:

xcrun simctl get_app_container booted com.rust.tests

Now use LLDB to run the binary:

lldb
platform select ios-simulator
platform connect <device-id>
target create /Users/<user>/Library/Developer/CoreSimulator/Devices/<device-id>/data/Containers/Bundle/Application/<app-id>/app.app/hello
run

SOURCE: Dinghy source, StackOverflow, other articles found through Google.

ISSUES:

Why can't we pass the linker when compiling the tests? Or why isn't the target doing this? Is there a way to do this? This doesn't seem to be well documented.