foo.c: In function 'main':
foo.c:5:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    5 |         scanf_s("%d %d %d", &y1, &m1, &d1);
      |         ^~~~~~~
      |         scanf
foo.c:20:34: warning: iteration 12 invokes undefined behavior [-Waggressive-loop-optimizations]
   20 |                         date += m[i];
      |                                 ~^~~
foo.c:18:35: note: within this loop
   18 |                 for (int i = 1; i <= 13; i++)
      |                                 ~~^~~~~
/nix/store/j2gmfdd29cp3rcvghmn1a5kgcnmf8myp-binutils-2.40/bin/ld: /tmp/ccHOqUB6.o: in function `main':
foo.c:(.text.startup+0x1b): undefined reference to `scanf_s'
/nix/store/j2gmfdd29cp3rcvghmn1a5kgcnmf8myp-binutils-2.40/bin/ld: foo.c:(.text.startup+0x36): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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