== wtf.c ==
#include <stdio.h>
#include <string.h>

const char SYMBOLS[] = "0123456789abcdefghijklmnopqrstuvwxyz";
int max_base = strlen(SYMBOLS);

int main(int argc, char **argv) {
}

== output ==
ski@ganiodayo:~/mysrc/skixp/tmp$ cc     wtf.c   -o wtf
wtf.c:5: warning: initializer element is not constant
wtf.c:5: warning: (near initialization for ‘max_base’)