make error

[hauntedvalleyaspect]

在make运行DKRL的代码的时候，报错显示
g++ Train_cnn_multi.cpp -o Train_cnn_multi -O2 -lpthread
Train_cnn_multi.cpp: 在函数‘void run(int, int, int, double, double, int)’中:
Train_cnn_multi.cpp:296:12: 警告：extended initializer lists only available with -std=c++11 or -std=gnu++11 [默认启用]
mut_mutex =PTHREAD_MUTEX_INITIALIZER;
^
Train_cnn_multi.cpp: 在函数‘void sgd()’中:
Train_cnn_multi.cpp:491:57: 警告：将一个整数转换为大小不同的指针 [-Wint-to-pointer-cast]
pthread_create(&threads[k], NULL, rand_sel, (void *)k); //train
^
Train_cnn_multi.cpp:499:61: 警告：将一个整数转换为大小不同的指针 [-Wint-to-pointer-cast]
pthread_create(&threads2[k], NULL, update_grad, (void *)k); //update
^
g++ Test_cnn.cpp -o Test_cnn -O2 -lpthread
，请问该如何解决