[Bug c++/66360] thread_local variable needs copy constructor

["pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66360

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This has nothing to do with thread_local.  That is removing static thread_local
still causes it to produce an error.


Here is a more reduced testcase:
template <typename T>
struct wrapper final
{
  T value;
  template <typename ...Args>
  wrapper(Args &&...args)
    : value(args...)
  {
  }
};

struct non_copyable
{
  non_copyable(const non_copyable &) = delete;
  non_copyable();
  ~non_copyable();
};

template <typename T>
class thread_local_variable final
{
private:
  wrapper<T> *pointer;
public:
  template <typename ...Args>
  thread_local_variable(Args &&...args)
  {
    wrapper<T> v(args...);
    pointer = &v;
  }
  T &get()
  {
    return pointer->value;
  }
};

non_copyable &fn()
{
  thread_local_variable<non_copyable> v;
  return v.get();
}


--- CUT ----
args here is {}.  I suspect an empty arguments it not being treated correctly.