Effect of CLANG_CXX_LANGUAGE_STANDARD on Swift/Objc code?

Xcode projects have a CLANG_CXX_LANGUAGE_STANDARD setting.

The question came up recently in a code review at my org, about whether this setting could impact Swift code (or for that matter, Obj. C code).

I would tend to think this would only impact C++ or Objective C++ code, but I wanted to ask you experts to make sure. Thoughts?