When I use XCode 6.3 to build the project which export from Unity4.6.6 with IL2CPP, but failed at link with that problem, someone who have meet this problem?
None of the mono_* functions are available with the IL2CPP scripting backend, so this code generates a linker error. Can you provide more information about what the code is attempting to do? We might have a different way to accomplish this with the IL2CPP scripting backend.