https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114
--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So I suggest something like:
friend bool
operator<(thread::id __x, thread::id __y) noexcept
- { return __x._M_thread < __y._M_thread; }
+ {
+#ifdef PTW32_VERSION
+ // implement operator< explicitly in terms of the internals of
+ // pthreads-win32's ptw32_handle_t.
+ return std::tie(__x._M_thread.p, __x._M_thread.x)
+ < std::tie(__y._M_thread.p, __y._M_thread.x);
+#else
+ // Pthreads doesn't define any way to do this, so we just have to
+ // assume native_handle_type is LessThanComparable.
+ return __x._M_thread < __y._M_thread;
+#endif
+ }
On trunk operator== is different to the gcc-5-branch, so would require a
similar change.
