There are two C++ standard libraries supported by Apple compilers.
The default for 10.8 and earlier is **libstdc++**, supported by Apple GCC compilers, GNU GCC compilers, and clang.
The default for 10.8 and earlier is **libstdc++**, supported by Apple GCC compilers, GNU GCC compilers, and clang. This was marked deprecated with a warning during compile as of Xcode 8.
The default for 10.9 is **libc++**, which is also the default for clang on older platforms when building C++11 code.
