/in/foo.c: In function 'main':
/in/foo.c:14:7: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  int *b;
       ^
/in/foo.c:10:7: warning: variable 'a' set but not used [-Wunused-but-set-variable]
  int *a;
       ^
/in/foo.c:19:2: warning: 'sec1' is used uninitialized in this function [-Wuninitialized]
  printf("sec in a =%d\n",sec1);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:21:2: warning: 'sec2' is used uninitialized in this function [-Wuninitialized]
  printf("sec in b =%d\n",sec2);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~