Using CleanroomLogger in a Swift script fails to resolve DefaultLogConfiguration - swift

Question

I'm just starting to play with Swift 2.0 for scripting and running into an issue with symbols being resolved.
Using Carthage I bootstrap from a Cartfile containing
github "emaloney/CleanroomLogger"
I am able to get CleanroomLogger working inside of Playground by:
Create a Workspace inside of XCode 7.1.1
Add the CleanroomLogger.xcodeproj file from ./Carthage/Checkouts/CleanroomLogger
Create a new Playground in the project
Inside of the playground I enter the code
import CleanroomLogger
var logConfig = DefaultLogConfiguration.init(minimumSeverity: LogSeverity.Debug, synchronousMode: true)
Log.enable(logConfig)
Log.debug?.message("Sample message sent to debug")
Log.debug?.value("Sample value sent to debug")
This plays without error. I only see () as the output in the playground next to each Log.debug? call which is expected. If I open up the Console app I see two entries:
11/20/15 10:33:51.455 PM Cleanroom Logger[70056]: DEBUG | <EXPR>:5 — Sample message sent to debug
11/20/15 10:33:51.455 PM Cleanroom Logger[70056]: DEBUG | <EXPR>:6 — <String: "Sample value sent to debug">
So clearly I have CleanroomLogger checked out and properly built at this point.
I proceed to try and use Cleanroom Logger from a script logger-demo.swift located in the same directory as my Cartfile. This script is identical to the playground code with the addition of the shebang at the start
#!/usr/bin/env swift -F Carthage/Build/Mac
import CleanroomLogger
var logConfig = DefaultLogConfiguration.init(minimumSeverity: LogSeverity.Debug, synchronousMode: true)
Log.enable(logConfig)
Log.debug?.message("Hello from inside my Mac")
Log.debug?.value("This is a test of value")
Running the script results in the following output:
$ ./logger-demo.swift
LLVM ERROR: Program used external function '__TMdV15CleanroomLogger23DefaultLogConfiguration' which could not be resolved!
Why would this resolve in a playground but not from a swift script?

Answer 1

Wow, that sounds complicated ...
Maybe try SwiftyBeaver logger for Swift 2 instead. It is simple(!), supports colors, is fast & is much more feature-complete.
P.S.: I am the creator :)