/in/foo.c: In function 'fun':
/in/foo.c:3:14: warning: unused variable 'c' [-Wunused-variable]
  int a=1,b=1,c;
              ^
/in/foo.c:3:10: warning: unused variable 'b' [-Wunused-variable]
  int a=1,b=1,c;
          ^
/in/foo.c:3:6: warning: unused variable 'a' [-Wunused-variable]
  int a=1,b=1,c;
      ^