On some platforms the AkOSChar string simply points to the same string, on others a new buffer is allocated on the stack using AkAlloca. This means you must make sure that:
The source string stays valid and unmodified for as long as you need the AkOSChar string (for cases where they point to the same string)
The AkOSChar string is used within this scope only -- for example, do NOT return that string from a function (for cases where it is allocated on the stack)