Thank you for your quick answer !
I know that my request is quite difficult to handle knowing that switching over STL implementations certainly need some tests on your side.
Unfortunately, i don’t think we’ve got a lot of time here waiting for the next FMOD release due to a release date for our game that comes very soon and we switch over FMOD a few weeks ago for the MAC version that works well. At that time i didn’t notice the IOS problem and now it’s quick painful to me to switch back to my previous-homemade-ugly sound engine :oops:
However, i tried to import the missing STL functions, using what i found at http://www.opensource.apple.com/source/libstdcxx/libstdcxx-56/src/tree.cc, in the projet that now compiles and seems to work well… thank’s god 
I’ve committed this workaround in the previous project and if you’re interested, please have a look at https://github.com/kdridi/FMODSample.git
Again, thank a lot for your quick answers and i hope i’ll get some good news for the next FMOD release soon 
Have a nice day !