I had the same problem after I copied an existing build configuration in S32DS 2018.R1 and delete the configuration gain in S32DS.
The problem is that S32DS does not completely delete the reference to the configuration but only deletes its properties:
Working configuration:
<configuration configurationName="Release">
<resource resourceType="PROJECT" workspacePath="/Project_Name"/>
</configuration>
Deleted Configuration:
<configuration configurationName="Debug_Release"/>
So what I did to solve the warnings is:
- Right click and delete all warnings in the console after opening the project
- Close the project
- Delete the unused configuration tag shown above in the .cproject file located in the project root folder
This was of course after I had already deleted the built configuration in S32DS itself.