ADTools clib2

C++-support using clib2 clib (enabled via -mcrt=clib2) is much better than with
the newlib clib at the moment. If you encounter any errors when compiling C++
projects using newlib, also try clib2. To be successful, you should use this
archive and install its
contents into the SDK: folder.

Also for C++, it is recommended not to use the shared objects feature (aka
dynload) for now. The reason is that the C++-ABI may change in the future.
Lastly, you should link the final executable using the --athread=native
option if you use anything from libstdc++.