[MacPorts] #59835: cmake: strange libc++ "if" condition

[MacPorts]

#59835: cmake: strange libc++ "if" condition
------------------------+--------------------
  Reporter:  michaelld  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  cmake      |
------------------------+--------------------

Comment (by kencu):

 this code works properly, but is a bit outdated, in that libc++ is to be
 used on 10.5 Intel as wel


 That "not" operator "!" plays with your mind.

 Please rewrite better if you like.

 libc++ should be forced on for 10.5 Intel and up. 10.4 Intel and all PPC
 should not be forced, as they presently can't use libc++.

-- 
Ticket URL: <https://trac.macports.org/ticket/59835#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS