[Bug 218644] fix build lang/beignet with llvm 4.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218644

Jan Beich <jbeich at FreeBSD.org> changed:

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--- Comment #6 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Eric Camachat from comment #4)
Can you reproduce with llvm39? On what FreeBSD version? Can you press Ctrl+T to
check wait message[1] ?

I have a similar issue on 12.0 amd64 (with drm-next merged) where the process
is stuck on [umtxn]. Prepending LD_PRELOAD=/lib/libthr.so.3 makes it work fine.
The first bad appears to be base r319971, bisecting which is complicated by
FREEBSD-diffs.

[1] https://wiki.freebsd.org/WaitChannels

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