Compiler Error：Undefined symbols for architecture x86_64

#include<stdio.h>
int main(void) {
    return 0;
}

environment ：mac & visual studio code

command：gcc kk.c -o kk && ./kk

Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)