Are you developing an OS X application or an iOS application? Because the error message in your screenshot says that the architecture being linked is armv7, which means you're developing an iOS application, but the Oracle Instant Client libraries you downloaded are for the OS X x86_64 architecture. If you are trying to make an OS X application, then your Xcode project is set up for the wrong architecture at least. If you are trying to make an iOS application, then you'll need iOS versions of the Oracle Instant Client libraries—and I don't see any such thing listed on the Oracle Instant Client downloads page.
Thanks for your response. Yes, am trying to develop an iOS application which will use OCI. In the process, am attempting to compile OCI (which has been provided for Mac OS X) for ARM. Thoughts/suggestion?
I realized now that the image I shared previously (showing the warnings) is of poor resolution. Here's a better one: