[MacPorts] #71616: icu{, -devel} @76.1: buildbot builds fails for 10.13 and earlier, due to dependency cycle

[MacPorts]

#71616: icu{,-devel} @76.1: buildbot builds fails for 10.13 and earlier, due to
dependency cycle
----------------------------+------------------------
  Reporter:  mascguy        |      Owner:  mohd-akram
      Type:  defect         |     Status:  assigned
  Priority:  High           |  Milestone:
 Component:  ports          |    Version:  2.10.5
Resolution:                 |   Keywords:
      Port:  icu icu-devel  |
----------------------------+------------------------

Comment (by mascguy):

 Replying to [comment:2 kencu]:
 > clang-11-bootstrap was created to help with this kind of problem…

 Ah, should `icu` have a build dependency on `clang-11-bootstrap`, like how
 it's done for ports like `libcxx`? (Along with removal of
 `compiler.cxx_standard 2017`, to avoid auto-selection?)

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Ticket URL: <https://trac.macports.org/ticket/71616#comment:5>
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