https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187114
--- Comment #3 from Ed Maste <ema...@freebsd.org> ---
It turns out I had a conclusive answer on this a couple of months ago, but
unfortunately forgot about it:
> Ed is correct. The handling of ${ORIGIN} was introduced the Generic
> Application Binary Interface by July of 2000.
>
> The DF_ORIGIN is only necessary if the a.out does not use ${ORIGIN} in a
> DT_NEEDED or DT_RUNPATH tag. and expects or anticipates that a $ORIGIN
> may be encountered later in the execution such as a dlopen() call.
> DF_ORIGIN was provided as a means of insuring correct results in these
> delayed pathname resolutions without requiring every a.out to incur the
> cost of a realpath() for its true location when started.
http://lists.cs.uiuc.edu/pipermail/lldb-dev/2014-February/003428.html
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