[MacPorts] #39485: Portfile for megatools

[MacPorts]

#39485: Portfile for megatools
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  Reporter:  s.cloherty@…  |      Owner:  macports-tickets@…
      Type:  submission    |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:
      Port:                |
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Comment (by larryv@…):

 Replying to [comment:13 egall@…]:
 > I thought if `otool -L` said that a library is linked against, that
 > that means that it uses symbols from that library though? Is that not
 > actually the case?

 No, a binary can link against a library without actually using any of that
 library’s symbols. That’s what the whole
 [http://thread.gmane.org/gmane.os.apple.macports.devel/21805/focus=21822
 Libtool fiasco] was about.

 > Previously I've only ever seen people on here use `otool -L` to decide
 > if a library needs to be declared as a dependency, I hadn't ever heard
 > of this policy of also needing to check with `nm`, too...

 It doesn’t matter which tools you use; the salient question is whether the
 library in question is required or not. If a dependency is determined to
 actually be unused, it should be removed. End of story.

 Conversely, if a dependency is required, it should be declared directly by
 the port and not brought in indirectly through other dependencies.

 Sane builds won’t link libraries that the software in question does not
 need, so `otool(1)` usually suffices. But not all builds are sane. If
 there’s any doubt, use `nm(1)`; it requires a little more work but can
 provide a more accurate picture.

-- 
Ticket URL: <https://trac.macports.org/ticket/39485#comment:14>
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