/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s1);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:8:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s2);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c: In function 'Length':
/in/foo.c:16:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;s[i]!='\0';i++)
  ^~~
/in/foo.c:18:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return m;
   ^~~~~~
/tmp/ccwO0Jbd.o: In function `main':
foo.c:(.text.startup+0xb): warning: the `gets' function is dangerous and should not be used.