Steps to reproduce:
1. Open a terminal and change directories to your top-level WebKit checkout.
2. Run `Tools/Scripts/run-webkit-app -g --release /Applications/Safari.app`
Then run-webkit-app exits with the following output:
$ Tools/Scripts/run-webkit-app -g --release /Applications/Safari.app
Starting -g with DYLD_FRAMEWORK_PATH set to point to built WebKit in /Volumes/.../OpenSource/WebKitBuild/Release.
Unable to find application named '-g'
Created attachment 335946 [details]
Comment on attachment 335946 [details]
Clearing flags on attachment: 335946
Committed r229710: <https://trac.webkit.org/changeset/229710>
All reviewed patches have been landed. Closing bug.