xcodebuild -exportLocalizations hangs until a device is plugged / unplugged or an iOS simulator is opened / closed

Originator:carlos.pereira
Number:rdar://25857436 Date Originated:21-April-2016
Status:Open Resolved:
Product:Developer Tools Product Version:
Classification: Reproducible:
 
Summary:
When running xcodebuild -exportLocalizations on the Xcode 7.3 command line (build version 7D175), the command-line never returns, making it impossible to use in a build script. 
When an event related to a device or simulator arrives,  (connecting / disconnecting) when execution then unhangs and the command returns.

Steps to Reproduce:
Run xcodebuild -project (PROJECT_NAME) -exportLocalizations -localizationPath (OUTPUT_PATH)

Expected Results:
The xliff containing all the strings is generated on OUTPUT_PATH and the command returns the execution.

Actual Results:
The xliff containing all the strings is generated on OUTPUT_PATH but the command never returns the execution until a simulator is opened (or closed if it was open before executing the command). Or a device is plugged (or unplugged if it was plugged before the execution of the command) from the USB. Then the command returns the execution.

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