[MacPorts] #65415: libgcc9 @9.5.0_1: builds fail on 10.8, 10.9, 10.10

[MacPorts]

#65415: libgcc9 @9.5.0_1: builds fail on 10.8, 10.9, 10.10
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  Reporter:  chillin-  |      Owner:  i0ntempest
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.2
Resolution:            |   Keywords:
      Port:  libgcc9   |
-----------------------+------------------------

Comment (by cjones051073):

 just blacklist clang 14 did not help, as clang 13 had the same issue.

 https://github.com/macports/macports-
 ports/commit/eacc1edf719f8db5163e02a69cd8acbd3b90d5fe

 which blacklists 12 and newer, so forces the use of clang-11 (a known
 sweet spot) seems to have perhaps done the trick, in so far as the builds
 seem to have got past gencondmd ok..

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Ticket URL: <https://trac.macports.org/ticket/65415#comment:12>
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