maintainer-feedback requested: [Bug 239630] x11/libxshmfence: prefer SHM_ANON over mksotemp()

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-x11 mailing list
<x11 at FreeBSD.org> for maintainer-feedback:
Bug 239630: x11/libxshmfence: prefer SHM_ANON over mksotemp()
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239630



--- Description ---
SHM_ANON is faster and more similar to memfd_create(). Not bothering to
upstream because futex/mksotemp fixes didn't get any feedback after 2 years.
Patchwork is complete crap for one-off contributors i.e., those humble enough
to not annoy everyone on patch maillist why their contribution wasn't reviewed
yet.

libxshmfence is only used by DRI3, so make sure to define LIBGL_DRI3_ENABLE via
environ(7) due to drm-legacy-kmod hacks in mesa-dri and if using
xf86-video-intel add Option "DRI" "3" to xorg.conf.