Segmentation Error: 11 starts of Xcode using xctool

Question

I am trying to use xctool to run my Xcode unit tests from a Jenkins server for CI purposes. When I run my tests with:

 xctool -project MyApp.xcodeproj -scheme MyApp test -sdk iphonesimulator 

I get the following error:

 /Users/Shared/Jenkins/Library/Developer/Xcode/DerivedData/MyApp-fxgsgucvulucjcbkdjllermhnvah/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyAppTests.build/Script-FA92AE8E162C5E1900A410A1.sh: line 3: 10301 Segmentation fault: 11 "${SYSTEM_DEVELOPER_DIR}/Tools/RunUnitTests" Command /bin/sh failed with exit code 139 

If I remove the default Run Script , which has:

 # Run the unit tests in this test bundle. "${SYSTEM_DEVELOPER_DIR}/Tools/RunUnitTests" 

from my test target, the xctool call works fine - and I can still run my unit tests directly in Xcode via Cmd+U

I made my way through a lot of searches, trying to find the “right” solution for this, but no luck. Just delete this post post post that causes RunUnitTests acceptable? What does it do?