Github user jablko commented on the issue:
https://github.com/apache/trafficserver/pull/1408
I rebased this onto #1416. My theory is that traffic_top (etc.) was getting
hwloc (etc.) because of Libtool's link_all_deplibs [1]. As I understand it,
when Libtool links to a library (libfoo), link_all_deplibs calls ld with
-llibrary for all of libfoo's dependencies (inter-library dependencies).
link_all_deplibs is turned off on Debian and Ubuntu (maybe other platforms) --
that's why I didn't see it on my machine -- but the default is "unknown", which
is a synonym for "yes".
We can set link_all_deplibs ourselves, but calling the linker with
--as-needed (#1416) is even more powerful because it will skip unused
-llibraries that we add to the command line (because we add them to LIBS) as
well as those that Libtool adds.
[1]
https://www.gnu.org/software/libtool/manual/libtool.html#index-link_005fall_005fdeplibs
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