It is entirely up to the compiler if this will work or not. None of the language standards can obviously say anything about what the other language should do.
In the best case, the exception will pass the C code and get back to the next C++ level while possibly leaking any dynamically allocated C structures. In the less good case, it will crash and burn!
One possibilty is of course to compile the C code as C++, while also checking that it is exception neutral.
