How do I enable C++17 in Xcode for Mac OSX?
How do I enable C++17 in Xcode (9.4.1) on OSX High Sierra (10.13.5)? Steps to use C++17 in Xcode (9.4.1) on OSX High Sierra (10.13.5): Open existing or create a new C++ project in Xcode Click on the "show project navigator" button. It is located on the top-left section of Xcode window just below the minimize/maximize/close window buttons. It is the left-most icon and looks like a folder. Click on "Build Settings" and scroll down to find and expand the section "Apple LLVM 9.0 - Language - C++" Change the C++ Language Dialect combobox selection to "C++17 [-std=c++17]" Verification steps: Now