foo.cc: In function 'int main()':
foo.cc:21:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   21 |         gets(s1), gets(s2);
      |         ~~~~^~~~
In file included from foo.cc:1:
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:21:23: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   21 |         gets(s1), gets(s2);
      |                   ~~~~^~~~
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/nix/store/3r87a2wq1w4l66wnsm7rqvy608mx23h6-binutils-2.40/bin/ld: /tmp/ccxHW6wp.o: in function `main':
foo.cc:(.text.startup+0xb): warning: the `gets' function is dangerous and should not be used.

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