Isn't Linux support in libc++ still not 100%? I'm using libc++/c++14 on a new project and I love it! Much better than my last experience with c++ (c++98).
I was worried about using libc++, but I recently found a great VPS provider which lets you install from an ISO so I can run FreeBSD in production. I no longer have any need for Linux. Develop on OSX, deploy on FreeBSD.
It's not quite 100%. There are still a few outstanding faults, mostly due to different localization assumptions made by the underlying libc. http://libcxx.llvm.org/results.Linux.html
I was worried about using libc++, but I recently found a great VPS provider which lets you install from an ISO so I can run FreeBSD in production. I no longer have any need for Linux. Develop on OSX, deploy on FreeBSD.