/in/foo.cc: In function 'int read()':
/in/foo.cc:10:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return y=='-'?-x:x;
         ~~~~~~^~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:10:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return y=='-'?-x:x;
         ~~~~~~^~~~~
/in/foo.cc:7:15: note: 'y' was declared here
  int x=0;char y;char o=getchar();
               ^
/in/foo.cc:10:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return y=='-'?-x:x;
         ~~~~~~^~~~~
/in/foo.cc:7:15: note: 'y' was declared here
  int x=0;char y;char o=getchar();
               ^
/in/foo.cc:10:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return y=='-'?-x:x;
         ~~~~~~^~~~~
/in/foo.cc:7:15: note: 'y' was declared here
  int x=0;char y;char o=getchar();
               ^