struct tPaths {
        char*   Logs;
        char*   Conf;
};

struct tAppConf {
        tPaths          Paths;
} AppConf;

strcpy(AppConf.Paths.Logs, "/var/logs/clgsh.log");

char fname[254];
char* sensor_name;
sensor_name = f_row[1];
sprintf(fname, "%s/%s/temperature", AppConf.Paths.Data, sensor_name);

char             fname[254];
const char *     PathData = AppConf.Paths.Data.c_str();
char*            sensor_name;
sensor_name      = f_row[1];
sprintf(fname, "%s/%s/temperature", PathData, sensor_name);

In file included from main.cpp:21:0:
sensor_temp.c: In function ‘void start_sensor_temp()’:
sensor_temp.c:122:34: error: ISO C++ forbids variable length array ‘thread’ [-Werror=vla]
sensor_temp.c:124:24: error: ISO C++ forbids variable length array ‘id’ [-Werror=vla]
cc1plus: all warnings being treated as errors

void start_sensor_temp()
{

        AppConf.Sensers.Temp_Active = true;

        // Описание дескрипторов
        MYSQL mysql;                            // Дескриптор соединения
        MYSQL_RES *res;                         // Дескриптор результирующей таблицы
        MYSQL_ROW row;

        mysql = db_connect();
        res = db_resource(mysql, "SELECT s_id, s_uid FROM v_sensors WHERE s_enabled = 1 AND s_type_id = 1 ORDER BY s_id");


        pthread_attr_t threadAttr;
        pthread_attr_init(&threadAttr);
        pthread_attr_setdetachstate(&threadAttr, PTHREAD_CREATE_DETACHED);

        unsigned num_rows = mysql_num_rows(res);

       pthread_t thread[num_rows];

        int id[num_rows];

        for (unsigned i = 0; i < num_rows; i++)
        {
                row = mysql_fetch_row(res);
                id[i] = atoi(row[0]);
                pthread_create(&thread[i], &threadAttr, thread_func, (void*)id[i]);
        }

        mysql_free_result(res); // Очищаем результаты
        mysql_close(&mysql); // Закрываем соединение

}