[MacPorts] #64316: gcc9 @9.4.0_1 & gcc10 @10.3.0_1: build failure: Undefined symbols for architecture x86_64

[MacPorts]

#64316: gcc9 @9.4.0_1 & gcc10 @10.3.0_1: build failure: Undefined symbols for
architecture x86_64
-------------------------+------------------------
  Reporter:  i0ntempest  |      Owner:  i0ntempest
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:  fixed       |   Keywords:
      Port:  gcc9 gcc10  |
-------------------------+------------------------

Comment (by jmroot):

 That patch doesn't appear to take into account the different versioning
 schemes of Apple clang and llvm.org clang. It's likely mishandling some
 versions of one or the other.

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Ticket URL: <https://trac.macports.org/ticket/64316#comment:19>
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