[Bug 217664] [DRI3] OpenGL applications crash in brw_workaround_depthstencil_alignment()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217664

--- Comment #11 from Jan Beich (mail not working) <jbeich at FreeBSD.org> ---
(In reply to Jan Beich (mail not working) from comment #6)
> Perhaps, Clang miscompiled it at some point but due to infrequent updates the packages was never rebuilt

x11/libxshmfence requires PTHREAD_PROCESS_SHARED but FreeBSD only implemented
it since 11.0-RELEASE (or base r296162). Essentially, DRI3 is broken on
anything below like /stable/10 branch. x11-drivers/xf86-video-intel still
defaults to DRI2, so the only concern is modesetting DDX which is enabled by
default if xorg.conf lacks Device section.

FWIW, NetBSD has patches to use POSIX named semaphores aka sem_open() et al.

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