[MacPorts] #67788: Refuse to run if install_name_tool is broken

[MacPorts]

#67788: Refuse to run if install_name_tool is broken
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 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.8.1
 Keywords:              |       Port:
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 I was just reminded that [https://lists.macports.org/pipermail/macports-
 dev/2020-November/042641.html Apple shipped a broken install_name_tool in
 Xcode 12.2], the first Xcode version for Big Sur. Any ports whose builds
 involve the use of `install_name_tool` on a symlink will probably succeed
 but will be wrong. This is a pain to diagnose when it happens. It would be
 impractical to analyze all ports to determine which ones use
 `install_name_tool` and update them individually to prevent the use of the
 bad `install_name_tool`. I'd like to propose that, if MacPorts doesn't
 already do this, it should check the version of Xcode and/or command line
 tools, and if it's one that has the broken `install_name_tool`, it should
 simply refuse to install any port and require the user to upgrade to a
 non-broken version. I think this will save some grief.

 I know Xcode 12.2 was affected. I don't know whether 12.3 was affected. I
 believe 12.4 was no longer affected. Apple never responded to my bug
 report to indicate when it was fixed. I was going to try downloading those
 command line tools versions, extracting `install_name_tool` from them, and
 testing to see which versions were affected.

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Ticket URL: <https://trac.macports.org/ticket/67788>
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