static_assert报错为什么？

mac os静态编译报错，下面报错：
static_assert(offsetof(sockaddr_in, sin_family) == 0, “sin_family offset 0”);
static_assert(offsetof(sockaddr_in6, sin6_family) == 0, “sin6_family offset 0”);
其中两个定义如下：
struct sockaddr_in {
__uint8_t sin_len;
sa_family_t sin_family;
in_port_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};

struct sockaddr_in6 {
__uint8_t sin6_len; /* length of this struct(sa_family_t) /
sa_family_t sin6_family; / AF_INET6 (sa_family_t) /
in_port_t sin6_port; / Transport layer port # (in_port_t) /
__uint32_t sin6_flowinfo; / IP6 flow information /
struct in6_addr sin6_addr; / IP6 address /
__uint32_t sin6_scope_id; / scope zone index */
};