Question

问题

对mosquitto_lib_init及其他一些C函数的未定义引用，产生此错误：

gcc -o“Protheus”./src/Brain/Brain.o ./src/Brain/Network.o
./src/Brain/Network.o：在函数mqtt_init_server': Network.c:(.text+0x1b8): undefined reference to mosquitto_new' Network.c :(。text + 0x1cf）：对mosquitto_connect' Network.c:(.text+0x1d8): undefined reference to mosquitto_lib_init'的未定义引用 makefile：30：目标'Protheus'的配方失败了 Network.c :(。text + 0x1f2）：对mosquitto_subscribe' Network.c:(.text+0x203): undefined reference to mosquitto_message_callback_set'的未定义引用 Network.c :(。text + 0x215）：对mosquitto_loop_forever' Network.c:(.text+0x21d): undefined reference to mosquitto_destroy'的未定义引用 Network.c :(。text + 0x222）：未定义的引用`mosquitto_lib_cleanup' collect2：错误：ld返回1退出状态 make：*** [Protheus]错误1
我尝试使用mosquitto.h运行代码，但我无法编译该源代码。
当我尝试运行代码时，我的makefile就坏了。

[MAKEFILE]

    -include ../makefile.init

    RM := rm -rf

    # All of the sources participating in the build are defined here
    -include sources.mk
    -include src/Brain/subdir.mk
    -include subdir.mk
    -include objects.mk

    ifneq ($(MAKECMDGOALS),clean)
    ifneq ($(strip $(C_DEPS)),)
    -include $(C_DEPS)
    endif
    endif

    -include ../makefile.defs

    # Add inputs and outputs from these tool invocations to the build variables 

    # All Target
    all: Protheus

    # Tool invocations
    Protheus: $(OBJS) $(USER_OBJS)
        @echo 'Building target: $@'
        @echo 'Invoking: GCC C Linker'
        gcc  -o "Protheus" $(OBJS) $(USER_OBJS) $(LIBS)
        @echo 'Finished building target: $@'
        @echo ' '

    # Other Targets
    clean:
        -$(RM) $(EXECUTABLES)$(OBJS)$(C_DEPS) Protheus
        -@echo ' '

    .PHONY: all clean dependents
    .SECONDARY:

-include ../makefile.targets

=============================================== ===================

我的代码是：

int ip_address(){
    int fd;
    struct ifreq ifr;
    char iface[] = "eth0";
    fd = socket(AF_INET, SOCK_DGRAM, 0);


    ifr.ifr_addr.sa_family = AF_INET;


    strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
    ioctl(fd, SIOCGIFADDR, &ifr);
    close(fd);


    IFACE = iface;
    IP_ADDRESS = inet_ntoa(((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr);
    if (IP_ADDRESS != NULL && strlen(IP_ADDRESS) > 7) {

    return 1;
    }

return 0;    }

int check_connection（）{

   if (ip_address()){


        return 0;
    }

return 1;}

void my_message_callback（struct mosquitto * mosq，void * obj，const struct mosquitto_message * message）{

printf（“收到消息：％s \ n”，（char *）message-＆gt; payload）;

}

int mqtt_init_server(){
    MOSQUITTO *mosq = NULL;
    mosq    = mosquitto_new(NULL,0,NULL);
    int ret = mosquitto_connect(mosq, MQTT_HOSTNAME,MQTT_PORT,0);

    if (0 == ret || !mosquitto_lib_init() || !mosq)
        {
            fprintf (stderr, "Can't initialize Mosquitto library\n");
            return 0;
        }

    ret = mosquitto_subscribe(mosq,NULL,MQTT_TOPIC,0);
    if(ret)
        {
            fprintf (stderr, "Can't publish to Mosquitto server\n");
            return 0;
        }

    mosquitto_message_callback_set (mosq, my_message_callback);
    mosquitto_loop_forever(mosq,-1,1);
    mosquitto_destroy (mosq);
    mosquitto_lib_cleanup();

    return 1;
    printf("CONECTED");
}

有人可以帮助我吗？

对mosquitto_lib_init的未定义引用

0 个答案: