/in/foo.cc: In function 'int main()':
/in/foo.cc:11:16: error: cast from 'void*' to 'int' loses precision [-fpermissive]
    ::"a" ((int)new_stack + n_byte))
                ^
/in/foo.cc:76:3: note: in expansion of macro 'new_stack'
   new_stack(16777216);
   ^~~~~~~~~