https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114
--- Comment #20 from ralphengels at gmail dot com <ralphengels at gmail dot com> --- Clarification. If not using pthreads-w32 #ifdef PTW32_VERSION // See libstdc++/67114 # define _GLIBCXX_THREAD_ID_LESS(X, Y) ((X).x < (Y).x) <- this #endif would end up undefined if say we build with winpthreads. As you noticed yourself os_defines.h gets pulled in after gthr.h so it fails, my suggestion if using a macro would be to put it in gthr_posix.h instead. My reason for this suggestion is that gthr_posix.h gets linked to gthr.h when building with posix threads and is visible to all parts of the code. My patch was made for the mingw.org compiler, since they still use pthreads-w32. Hope this clears it up, i was a little tired at the time of writing my last reply.
