配置at_device组件并打开ESP32后编译报错

发布于 2023-12-13 11:44:12 浏览：706 订阅该版

[tocm]

- BSP：stm32l431-BearPi
- rt-thread版本：RT-Thread v5.0.2 released
- 报错内容：
```
../../../components/net/sal/impl/af_inet_at.c(85): error: incompatible function pointer types initializing 'int (*)(int, struct msghdr *, int)' with an expression of type 'int (int, int, int, void *, socklen_t *)' (aka 'int (int, int, int, void *, unsigned int *)') [-Wincompatible-function-pointer-types]
```

- 报错截屏：
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231213/1a6b5b31845620e5f3e053f866731384.png.webp)
### 复现步骤：
1. 全新clone：https://github.com/RT-Thread/rt-thread.git
2. 使用menuconfig进行配置，打开lpuart1，打开AT_DEVICE组件（IOT分类下）和Espressif ESP32并配置为lpuart1
3. 保存，运行`pkgs --update`
4. 运行`scons --target=mdk5`
5. keil内更改编译器为ARM Compiler V6.19，将Language C改为C11
6. 编译即报错

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231213/5571cdafd7e5d530f5d1f7b456c72221.png)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231213/0ed74cb621e586b0f73c8aa585d9ea1d.png)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231213/9f5e1b684d7c2fc37ea75e88b067afaa.png.webp)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231213/786a7e826b930f7c27e17dfcad6a482b.png.webp)

### 报错原因分析
`.\components\net\sal\impl\af_inet_at.c中sal_socket_ops`赋值与
`.\components\net\sal\include\sal_low_lvl.h`中的定义不一致，缺少了sendmsg与recvmsg
头文件中定义如下

```c
/* network interface socket opreations */
struct sal_socket_ops
{
    int (*socket)     (int domain, int type, int protocol);
    int (*closesocket)(int s);
    int (*bind)       (int s, const struct sockaddr *name, socklen_t namelen);
    int (*listen)     (int s, int backlog);
    int (*connect)    (int s, const struct sockaddr *name, socklen_t namelen);
    int (*accept)     (int s, struct sockaddr *addr, socklen_t *addrlen);
    int (*sendto)     (int s, const void *data, size_t size, int flags, const struct sockaddr *to, socklen_t tolen);
    int (*sendmsg)    (int s, const struct msghdr *message, int flags);
    int (*recvmsg)    (int s, struct msghdr *message, int flags);
    int (*recvfrom)   (int s, void *mem, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
    int (*getsockopt) (int s, int level, int optname, void *optval, socklen_t *optlen);
    int (*setsockopt) (int s, int level, int optname, const void *optval, socklen_t optlen);
    int (*shutdown)   (int s, int how);
    int (*getpeername)(int s, struct sockaddr *name, socklen_t *namelen);
    int (*getsockname)(int s, struct sockaddr *name, socklen_t *namelen);
    int (*ioctlsocket)(int s, long cmd, void *arg);
    int (*socketpair) (int s, int type, int protocol, int *fds);
#ifdef SAL_USING_POSIX
    int (*poll)       (struct dfs_file *file, struct rt_pollreq *req);
#endif
};
```

源文件如下：

```c
static const struct sal_socket_ops at_socket_ops =
{
    at_socket,
    at_closesocket,
    at_bind,
#ifdef AT_USING_SOCKET_SERVER
    at_listen,
#else
    NULL,
#endif
    at_connect,
#ifdef AT_USING_SOCKET_SERVER
    at_accept,
#else
    NULL,
#endif
    at_sendto,
    at_recvfrom,
    at_getsockopt,
    at_setsockopt,
    at_shutdown,
    NULL,
    NULL,
    NULL,
#ifdef SAL_USING_POSIX
    at_poll,
#endif /* SAL_USING_POSIX */
};
```