iOS 8.1 Emscripten issue with std::chrono

main.cpp

#include <chrono>
#include <iostream>

int
main()
{
	std::cout << "before" << std::endl;
	auto now = std::chrono::high_resolution_clock::now();
	std::cout << "after" << std::endl;
	return 0;
}

Makefile

main.html: main.cpp
	em++ -std=c++11 -O2 main.cpp -o main.bc
	emcc -O2 main.bc -o main.html

clean:
	rm -f main.bc main.js main.html main.html.map main.html.mem