On ARM platforms, `__dso_handle` is used for dynamic shared objects. But it is also required if global static objects are used. To avoid that `sys/cpp11_compat` is required only for using the (re)defined `new`/`delete` operators, `__dso_handle` is moved to module `sys/cpp_new_delete`
The `new` and `delete` operators that don't need `libtsdc++` are also provided by module `sys/cpp_new_delete` for platforms that don't have the `libstdc++`. Since these operators in `sys/cpp11-compat` are just wrappers for standard `malloc`/`free` functions like in `sys/cpp_new_delete`, the `new`/`delete` operators that don't need `libstdc++` are used from `sys/cpp_new_delete`. Only the `new`/`delete` operators that require the `libstd++` are left in `sys/cpp11-compat`.
So it is sufficient for the use of the (re)defined `new`/`delete` operators that an application uses the module `sys/cpp_new_delete` instead of `sys/cpp11-compat` and thus also works on platforms without `libstdc++`.
cppsupport.cpp contains functions which are necessary in order to use
some features of the C++ language, e.g. calling static constructors or
virtual functions.
TODO/Not implemented yet:
- Test virtual functions
- Handle exceptions (stack unwinding)
- Run time type identification (RTTI)
