[MacPorts] #64412: mariadb-10.6/7 fails to build on Mojave 10.14.6

[MacPorts]

#64412: mariadb-10.6/7 fails to build on Mojave 10.14.6
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  Reporter:  ArtKoKo                    |      Owner:  michaelld
      Type:  defect                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.7.1
Resolution:                             |   Keywords:  mojave
      Port:  mariadb-10.6 mariadb-10.7  |
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Changes (by ryandesign):

 * keywords:  mariadb mojave => mojave


Comment:

 Apple clang and open source clang use different version numbering schemes.
 Open source clang 10 is not the same thing as Apple clang 10.

 It would not be correct to check for `__APPLE__` here since it is
 perfectly valid to use either Apple clang or open source clang on Apple
 platforms. If you want to know if Apple clang is being used, you would
 check for `__apple_build_version__`.

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Ticket URL: <https://trac.macports.org/ticket/64412#comment:3>
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