今天想弄个多线程玩玩，可是这编译器脑回路清奇

#include<cstdio>
#include<thread>
#include<stdlib.h>
using namespace std;
void threadA(){
	printf("Hello World!");
}
int main(){
	thread t(threadA);
}

本来应该是没事的，可是你猜编译器怎么说？

[Error] 'thread' was not declared in this scope
[Note] 'std::thread' is defined in header '<thread>'; did you forget to '#include <thread>'?

到底咋回事啊啊啊啊