you probably observe this error.
In order to build GHS based project in S32DS you should setup the build variable S32DS_GHS_PATH.
Go to Window -> Preferences -> C/C++ -> Build -> Build Variables (Show system varaibles) and enter the ghs tools path.
Note: If you switch your workspace to a new one - you should re-enter this path again.
Then you should be able to build GHS S32DS project:
Hope it helps!