[MacPorts] #64694: gcc/libgcc: update older systems prior to 10.6 to a newer gcc version?

[MacPorts]

#64694: gcc/libgcc: update older systems prior to 10.6 to a newer gcc version?
----------------------------+---------------------------
  Reporter:  barracuda156   |      Owner:  (none)
      Type:  request        |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.1
Resolution:                 |   Keywords:  leopard tiger
      Port:  libgcc, gcc10  |
----------------------------+---------------------------

Comment (by barracuda156):

 PR to move 10.5 to using new `libgcc`: https://github.com/macports
 /macports-ports/pull/16843

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Ticket URL: <https://trac.macports.org/ticket/64694#comment:14>
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