From what I gather after doing some research, there is a bug in the latest release of scan-build that prevents it from inferring the proper compiler config when running against Xcode-based iOS projects. This is easily solved by passing an option to scan-build to force it to use the clang config; however, the Jenkins plugin does not permit options to be passed directly to scan-build.

Please add the ability to pass arguments directly to scan-build via the plugin.