如何在 C 中正确包含 libssh

Question

每次我尝试在 Ubuntu 上使用 gcc 编译代码时都会收到错误。

我通过输入以下命令安装了 libssh-dev：

sudo apt-get install libssh-dev

它安装得很好（没有错误消息）

我试图编译的代码是：

#include <stdlib.h>
#include <stdio.h>
#define LIBSSH_STATIC 1
#include <libssh/libssh.h>

int main(void){
    int rc;
    int port = 21;
    char *pass = "password";

    ssh_session my_ssh_session = ssh_new();
    if(my_ssh_session == NULL){
        exit(-1);
    }

    ssh_options_set(my_ssh_session, SSH_OPTIONS_HOST, "localhost");
    ssh_options_set(my_ssh_session, SSH_OPTIONS_PORT, &port);
    ssh_options_set(my_ssh_session, SSH_OPTIONS_USER, "username");

    rc = ssh_connect(my_ssh_session);
    if(rc != SSH_OK){
        fprintf(stderr, "Error connecting to localhost: %s\n", ssh_get_error(my_ssh_session) );
        exit(-1);
    } 

    ssh_userauth_password(my_ssh_session, NULL, pass);

    ssh_disconnect(my_ssh_session);
    ssh_free(my_ssh_session);
}

当我尝试编译代码时，错误消息显示：

user@neodym:~/Desktop/projects/ssh$ gcc -lssh ssh_client.c 
/tmp/ccGihId0.o: In function `main':
ssh_client.c:(.text+0x2a): undefined reference to `ssh_new'
ssh_client.c:(.text+0x57): undefined reference to `ssh_options_set'
ssh_client.c:(.text+0x6c): undefined reference to `ssh_options_set'
ssh_client.c:(.text+0x84): undefined reference to `ssh_options_set'
ssh_client.c:(.text+0x90): undefined reference to `ssh_connect'
ssh_client.c:(.text+0xa5): undefined reference to `ssh_get_error'
ssh_client.c:(.text+0xe2): undefined reference to `ssh_userauth_password'
ssh_client.c:(.text+0xee): undefined reference to `ssh_disconnect'
ssh_client.c:(.text+0xfa): undefined reference to `ssh_free'
collect2: error: ld returned 1 exit status

我已经准备好用谷歌搜索了，但到目前为止还没有任何效果。

libssh 头文件安装在/usr/include/libssh/中，因此 gcc 应该能够找到它们。

你能帮我解决这个问题吗？

Answer 1

尝试编译：

gcc -c ssh_client.c

然后与ssh库链接：

gcc -o ssh_client ssh_client.o -lssh

或者一步一步：

gcc -o ssh_client ssh_client.c -lssh