[MacPorts] #60853: port mysql8 @8.0.21 fails to build on less than macOS 10.12 due to system libc++ being too old

[MacPorts]

#60853: port mysql8 @8.0.21 fails to build on less than macOS 10.12 due to system
libc++ being too old
----------------------------+-------------------------
  Reporter:  wadjei         |      Owner:  herbygillot
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:  mavericks
      Port:  mysql8 libcxx  |
----------------------------+-------------------------

Comment (by chrstphrchvz):

 Pinning the version is particularly non-ideal for a port that receives
 security updates often; I would be more inclined to check `${os.major}`
 and refuse to build on 10.11 or earlier in this case. (Security risks are
 probably already compounded by running outdated/insecure OS versions.)

 I would be curious if there's an alternative non-EOL MySQL-like port to
 recommend instead, but it seems a number of them currently have problems
 building on 10.11 and earlier; the only working one I'm aware of is
 `mariadb-10.1` (which is EOL in a few months).

-- 
Ticket URL: <https://trac.macports.org/ticket/60853#comment:11>
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