foo.c: In function 'main':
foo.c:7:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    7 |         gets(s1);
      |         ^~~~
In file included from foo.c:1:
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.c:8:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
    8 |         gets(s2);
      |         ^~~~
/nix/store/y8wfrgk7br5rfz4221lfb9v8w3n0cnyd-glibc-2.37-8-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.c:10:13: warning: unused variable 'cnt' [-Wunused-variable]
   10 |         int cnt=0;
      |             ^~~
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/ccPTi6uY.o: in function `main':
foo.c:(.text.startup+0x11): warning: the `gets' function is dangerous and should not be used.

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