GCC 6.1 (C++17) doesn't compile std::atomic<std::chrono::system_clock::time_point> with default ctor

#include <iostream>
#include <atomic>
#include <chrono>
int main()
{
std::atomic<std::chrono::system_clock::time_point> at; // won't compile in GCC 6.1 (C++17)
std::cout << std::boolalpha	<< "is lock free? "	<< std::atomic_is_lock_free(&at) << '\n';
std::cin.get();
}

GCC 6.1 (C++17) doesn't compile std::atomic<std::chrono::system_clock::time_point> with default constructor.

Compiler messages:

main.cpp: In function 'int main()':

main.cpp:6:53: error: use of deleted function 'std::atomic<_Tp>::atomic() [with _Tp = std::chrono::time_point<std::chrono::_V2::system_clock, std::chrono::duration<long int, std::ratio<1l, 1000000000l> > >]'

std::atomic<std::chrono::system_clock::time_point> at;

^~

In file included from main.cpp:2:0:

/usr/local/include/c++/6.1.0/atomic:185:7: note: 'std::atomic<_Tp>::atomic() noexcept [with _Tp = std::chrono::time_point<std::chrono::_V2::system_clock, std::chrono::duration<long int, std::ratio<1l, 1000000000l> > >]' is implicitly deleted because its exception-specification does not match the implicit exception-specification ''

atomic() noexcept = default;

^~~~~~

However, clang 3.8 (C++ 14) and visual c++ 2013 compiler do.

The code below will help you get through:

#include <iostream>
#include <atomic>
#include <chrono>
int main()
{
std::atomic<std::chrono::system_clock::time_point> at(std::chrono::system_clock::now());
std::cout << std::boolalpha	<< "is lock free? "	<< std::atomic_is_lock_free(&at) << '\n';
std::cin.get();
}

tag: atomic<time_point>