[MacPorts] #71943: Explain legacy-support issue with precompiled rustc

[MacPorts]

#71943: Explain legacy-support issue with precompiled rustc
-----------------------+---------------------------------
 Reporter:  fhgwright  |      Owner:  MarcusCalhoun-Lopez
     Type:  request    |     Status:  assigned
 Priority:  Low        |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  legacy-support
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 Ticket #59135 mentions an issue with a precompiled `rustc` running on a
 different OS than the one where it was built.  But it's lacking in detail,
 both about what the issue is, and also about how the versioned-symbol hack
 [https://github.com/macports/macports-legacy-
 support/commit/834c79180070f0472e7f9593b7b99e1e7958ab4b] works to fix it.
 A better explanation would be helpful.

 I'm assigning this to Marcus, as the reporter of the issue, though I'm not
 holding my breath for a response.  Perhaps Ken knows at least some of it.

 Regarding versioned symbols, if there's some online documentation
 regarding that feature, a link would be fine.

-- 
Ticket URL: <https://trac.macports.org/ticket/71943>
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