CMake 3.9.1:

1. IPHONEOS_DEPLOYMENT_TARGET (relates build: fix Xcode 10 build problems #12586 iOS Framework build failure with Xcode 10 beta 6, related to NEON #12418):

IPHONEOS_DEPLOYMENT_TARGET = 6.0
warning: The iOS deployment target is set to 6.0, but the range of supported deployment target versions for this platform is 8.0 to 12.0.

2. libc++:

warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]

warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of iOS 7 [-Wdeprecated]