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", &a, &b, &c);
      |         ^~~~~~~
      |         scanf
foo.c:13:9: warning: implicit declaration of function 'printf_s'; did you mean 'printf'? [-Wimplicit-function-declaration]
   13 |         printf_s("%d %d %d", a, b, c);
      |         ^~~~~~~~
      |         printf
/nix/store/jfkmqz20q8fsaqizcml86adxqyzlwllx-binutils-2.38/bin/ld: /tmp/ccSQa7qy.o: in function `main':
foo.c:(.text.startup+0x1b): undefined reference to `scanf_s'
/nix/store/jfkmqz20q8fsaqizcml86adxqyzlwllx-binutils-2.38/bin/ld: foo.c:(.text.startup+0x89): undefined reference to `printf_s'
collect2: error: ld returned 1 exit status

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