Can c == c be false?

a.cpp

#include <iostream>
#include <thread>

// Compile with g++ -std=c++11 a.cpp -pthread

volatile int c = 0;
volatile bool done = false;

void change_c() {
  while (!done) {
    c++;
  }
}

void check_c() {
  while (c == c);
  done = true;
}

int main() {
  std::thread t1(change_c);
  std::thread t2(check_c);

  t2.join();
  t1.join();
  std::cout << "Done at c = " << c << std::endl;
}