foo.c: In function 'main':
foo.c:6:9: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    6 |         scanf_s("%d %d", &x1,&x2);
      |         ^~~~~~~
      |         scanf
/nix/store/vhf2cr6immz4qdxd83y025fnxim8mmfg-binutils-2.38/bin/ld: /tmp/ccpKcime.o: in function `main':
foo.c:(.text.startup+0x28): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

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