g++ without typecast

This program will compile using gcc. But fails using g++ compiler ( we
need explicit type casting  here).

Is there any flag or anyother way thru which we could compile this
using g++ ( without explicit type cast )

#include <stdio.h>
int main()
{
     unsigned int addr=0xffff;
     int *ptr;
     ptr=addr;
     return 0;
}
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