phh @ Pierre ~ % cat test.c
#include <stdio.h>

int main() {
        char *line = NULL;
        memset(&line, 0, sizeof(line));
}
phh @ Pierre ~ % gcc test.c -o test
test.c: In function âmainâ:
test.c:5: attention : incompatible implicit declaration of built-in function âmemsetâ
phh @ Pierre ~ % ./test
phh @ Pierre ~ % return $?
phh @ Pierre ~ %