/in/foo.c: In function 'main':
/in/foo.c:8:3: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
   scanf_s("%d", &x);
   ^~~~~~~
   scanf
/tmp/ccROOr0L.o: In function `main':
foo.c:(.text.startup+0x1b): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status