[MacPorts] #44125: cmake needs to support building against / with a deployment target set (prevents libc++ support on Snow Leopard for cmake projects)

[MacPorts]

#44125: cmake needs to support building against / with a deployment target set
(prevents libc++ support on Snow Leopard for cmake projects)
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  Reporter:  mojca@…       |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  cmake libcxx  |
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Comment (by jeremyhu@…):

 The patch just makes it such that / can be chosen as a syslibroot when
 setting a deployment target... the exact thing we're trying to do in the
 PortGroup

 > On the other hand I understand that setting target to 10.6 on 10.7
 without specifying the SDK might render the resulting binary useless on
 10.6.

 Why do you say that?  The whole point of setting the deployment target to
 10.6 means that the resulting binary will work on 10.6 unless there's a
 bug in the toolchain for some reason (which setting the sysroot won't
 solve).

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Ticket URL: <https://trac.macports.org/ticket/44125#comment:15>
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