[MacPorts] #59351: Cannot compile gfortran (or even libgcc7) under Catalina

[MacPorts]

#59351: Cannot compile gfortran (or even libgcc7) under Catalina
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  Reporter:  thepeteriley  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  High          |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by kencu):

 Thank you for the report!

 Unfortunately, gcc has so far only made `gcc9` compatible with Catalina.
 Perhaps you might be able to use `gcc9` in your project.

 `gcc9` should be the current default, but if you're upgrading from older
 installations, you might still be calling in `gcc7`, which does not work
 on Catalina at present.

 We don't yet have a timeline on when or if `gcc7` will work with Catalina.

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Ticket URL: <https://trac.macports.org/ticket/59351#comment:2>
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