Thank you, @f8bet00net.
Yeah, I remember I had gone though this with you before. But recently, we found there is a way to customize TreatSpecificWarningsAsErrors settings in projectdefinition.txt for MSVCBase.props for windows VS projects.
So I asked this question again just to double confirm if we could do similar things for MacOS XCode settings.
Thanks for confirming this is not possible on MacOS.
B