c - 期望 'struct netif *' 但参数类型为 'struct netif *'

Question

<分区>

Answer 1

这个“完整程序”

void foonetif(struct netif *dst) {
  if (dst) return;
  return;
}

struct netif {
  double bar;
};

int main(void) {
  struct netif *netif = 0; /* NULL */
  foonetif(netif);
  return 0;
}

从 gcc 10398683.c(gcc 版本 4.6.3)生成此输出，因此使用所有默认选项

10398683.c:1:22: warning: ‘struct netif’ declared inside parameter list [enabled by default]
10398683.c:1:22: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
10398683.c: In function ‘main’:
10398683.c:12:3: warning: passing argument 1 of ‘newnetif’ from incompatible pointer type [enabled by default]
10398683.c:1:6: note: expected ‘struct netif *’ but argument is of type ‘struct netif *’

注意最后一个警告(真的是一个注意事项):)