[MacPorts] #71182: Ports that depend on non-existent / removed ports

[MacPorts]

#71182: Ports that depend on non-existent / removed ports
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  Reporter:  szhorvat  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:            |
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Comment (by szhorvat):

 To be clear, I am not doing this to find issues in MacPorts. That's just a
 side effect of checking the dependency graph dataset (which I'm interested
 in) for consistency. It is possible that there are mistakes, though I
 haven't found any so far.

 `py37-build` depends on `py37-pyproject_hooks`, then `py37-build` has 217
 ports depending on it, excluding test dependencies, but including all
 other dependency types, including build dependencies. The majority are
 probably build dependencies.

 This number is confirmed by `port echo rdepends:py37-build | wc`.

 I posted these numbers in hope that they're helpful, since I have the
 entire dependency graph here and I can run queries fairly easily. Let me
 know if you want me to test anything (for example, exclude certain
 dependency types).

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Ticket URL: <https://trac.macports.org/ticket/71182#comment:11>
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