[MacPorts] #41783: Always use Mac OS X SDK

[MacPorts]

#41783: Always use Mac OS X SDK
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.2.99
Resolution:                |   Keywords:
      Port:                |
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Comment (by mojca@…):

 Jeremy's opinion is that specifying SDK shouldn't ever be needed at all.
 Which is exactly the contrary to what this patch is trying to do.

 Always specifying SDK will most certainly break `libc++` on 10.6 (but then
 again `libc++` could install files inside the SDK). As a consequence at
 the moment it would break '''everything''' on 10.6 if `libc++` is chosen
 by default in MacPorts configuration.

 My experience tells me that specifying SDK explicitly is often needed, in
 particular when compiling for an older Mac OS X version (I'm not excluding
 software bugs for the problems). See #44125 and please talk to Jeremy.

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Ticket URL: <https://trac.macports.org/ticket/41783#comment:10>
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