[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:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  gcc9 gcc10  |
-------------------------+--------------------

Comment (by EJFielding):

 I recently upgraded a Mac to Monterey macOS 12.2.1 and had trouble with
 the MacPorts migration failing for the installation of `gcc9` and `gcc10`.
 It seems to be the same bug that people found previously in the build of
 `libgcc9`. I updated my Xcode to v. 13.3 to see if that would help, but it
 did not. I also tried to install `gcc8` but that installation wanted to
 install both `libgcc8` and `libgcc9` as dependencies, so it also failed.

 Now I see that `gcc11` was successfully installed, so I guess I can use
 that.

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Ticket URL: <https://trac.macports.org/ticket/64316#comment:7>
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