As far as I know for the M4 core to run RPC commands it needs [cflags.tx](https://github.com/arduino/ArduinoCore-mbed/blob/master/variants/PORTENTA_H7_M4/cflags.txt) and [cxxflags.txt](https://github.com/arduino/ArduinoCore-mbed/blob/master/variants/PORTENTA_H7_M4/cxxflags.txt) to have ```-fexceptions``` inserted at the bottom of the file. Is this something that should be inserted by default for everyone? Would you like a PR for it?