CXX_STANDARD AND CMAKE_OSX_DEPLOYMENT target
While working in CMake files for wxWidgets (https://github.com/wxWidgets/wxWidgets/tree/master/build/cmake) I came across an issue that I think would make sense to address in CMake
When building with CXX_STANDARD 11 libc++ is required. When the deployment target is 10.9+ this is automatically selected. Lower deployment targets require explicit -stdlib=libc++ compile and link flags.
As setting CXX_STANDARD should automatically set required compiler flags it might make sense to automatically add this with deployment targets 10.7 - 10.8.