[MacPorts] #69812: /usr/bin/clang++ cannot compile anything when trying to compile as x86_64 on a current arm system against the MacOSX10.13.sdk

[MacPorts]

#69812: /usr/bin/clang++ cannot compile anything when trying to compile as x86_64
on a current arm system against the MacOSX10.13.sdk
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  Reporter:  lukaso  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by lukaso):

 Thanks for looking into this. The really odd thing is that it works fine
 on arm64, just not on rosetta.

 > and now I just have to remind myself why we are trying to bash our heads
 in building against the 10.13 SDK again ...

 I know, this is a huge pain... The reason is to be able to compile GIMP
 for x86_64 now that CI providers are sunsetting their intel Macs. It's
 definitely feeling like this approach is running against a brick wall, so
 finding a hosted old mac might be the only path. Although, right now, the
 more likely is that GIMP stops supporting Intel Macs.

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Ticket URL: <https://trac.macports.org/ticket/69812#comment:23>
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