[MacPorts] #44125: cmake: default values of CMAKE_OSX_SYSROOT/DEPLOYMENT_TARGET (prevent linking against libc++)

[MacPorts]

#44125: cmake: default values of CMAKE_OSX_SYSROOT/DEPLOYMENT_TARGET (prevent
linking against libc++)
---------------------------+--------------------------------
  Reporter:  mojca@…       |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  cmake libcxx  |
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Comment (by jeremyhu@…):

 > by the CMake PortGroup unless explicitly requested otherwise.

 Yeah, the CMake PortGroup should honor configure.sdk_version and
 configure.sdkroot ... is that not the case right now?

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Ticket URL: <https://trac.macports.org/ticket/44125#comment:6>
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