[MacPorts] #61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS 11.0 Big Sur

[MacPorts]

#61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS
11.0 Big Sur
-------------------------+--------------------
  Reporter:  kgerheiser  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  bigsur
      Port:  libgcc9     |
-------------------------+--------------------

Comment (by michaelld):

 Might be related ... might not ... I updated my ports to tree to get this
 latest GCC9 patch. `libgcc9` failed to install anything during `destroot`
 ... I'm running macOS 11.0.1 20B29 && Xcode 12.2 12B5035g. I'll attach a
 highly-compressed build log; maybe it will help

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Ticket URL: <https://trac.macports.org/ticket/61494#comment:7>
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