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

[MacPorts]

#71943: Explain legacy-support issue with precompiled rustc
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  Reporter:  fhgwright       |      Owner:  MarcusCalhoun-Lopez
      Type:  request         |     Status:  reopened
  Priority:  Low             |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  legacy-support  |
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Comment (by kencu):

 Hi Marcus! I hope you are well.

 I don't think there is any source for official documentation of the magic
 linker symbols, but the 5 references above including the source code
 reference in ld64 in particular are - as a whole - quite comprehensive
 about how the symbol hiding/showing mechanism works I found.

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Ticket URL: <https://trac.macports.org/ticket/71943#comment:5>
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