[MacPorts] #59389: Failed to build libgcc7 in Catalina

[MacPorts]

#59389: Failed to build libgcc7 in Catalina
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  Reporter:  mengqiz  |      Owner:  (none)
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  wontfix  |   Keywords:
      Port:           |
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Comment (by mengqiz):

 Thanks. But when I tried to install gcc9, it said that it's broken and
 that gcc7 & gcc8 need to be rebuilt, as following

 --->  Found 12 broken files, matching files to ports
 --->  Found 2 broken ports, determining rebuild order
 You can always run 'port rev-upgrade' again to fix errors.
 The following ports will be rebuilt:
  gcc7 @7.3.0

  gcc8 @8.2.0
 Continue? [Y/n]:

 After I keyed in Y, gcc7 still can't be installed. Any suggestions?
 Thanks.

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Ticket URL: <https://trac.macports.org/ticket/59389#comment:3>
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