Warning when compiling with clang++

Warning when compiling with clang++

When I compile the code:
#include <iostream>
#include <string.h>
using namespace std;
int main(void) {
string m1;
cout<< "enter your name: "<<endl;
getline(cin,m1);
cout << "Your name is: " << m1 << endl;
return EXIT_SUCCESS;
}
It give the following warning:
type of symbol `_main' changed from 32 to 512 in
>C:\Users\KDesktop\AppData\Local\Temp\cc7XPBuL.o
Secondly, the compiler does generate an .exe file, but whenever I run it,
the program crashes immediately. Can someone help me with this issue.
Thank you