[MacPorts] #67416: libgcc12 @12.3.0: build failure on Monterey

[MacPorts]

#67416: libgcc12 @12.3.0: build failure on Monterey
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  Reporter:  hululud         |      Owner:  mascguy
      Type:  defect          |     Status:  reopened
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.8.1
Resolution:                  |   Keywords:  monterey
      Port:  gcc12 libgcc12  |
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Comment (by ryandesign):

 Xcode 13.4.1 and the Xcode 13.4 command line tools are now installed on
 the macOS 12 builders and builds of gcc12 will be happening soon. I'll
 also run builds of all the R modules since R depends on gcc12. That should
 keep things busy for awhile.

 Should still fix the code in the gcc12 Portfile so that users who have
 Xcode 14.0 or 14.0.1 get a proper early error message such as [comment:11
 what Ken suggested].

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Ticket URL: <https://trac.macports.org/ticket/67416#comment:16>
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