[MacPorts] #38684: apple-gcc42 can no longer be built on Tiger

[MacPorts]

#38684: apple-gcc42 can no longer be built on Tiger
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  Reporter:  ryandesign@…  |      Owner:  mfeiri@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:  tiger
      Port:                |
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Comment (by mfeiri@…):

 The problem here really is xnu-headers. I do make an effort to support as
 many old platforms as I can, but darwin9/ppc is the oldest one I have.
 I'll happily accept patches to support darwin8 in xnu-headers, but I can
 not do/test that myself.

 @jeremyhu: Is "newer userland headers [...] are still compatible with
 older systems" the official position of Apple? That would be nice!! I
 simply do not have the resources to do the necessary validation tests
 myself and I certainly don't have resources to do validation of a backport
 to an unsupported architecture. So, I just closely follow upstream.

 I would have expected to hear criticism suggesting the other extreme:
 Follow Apple's example and have multiple distinct SDKs, e.g.
 ${prefix}/SDKs/MacOSX10.8.sdk. Any thoughts about that?

 Anyway, in r104991 I've just removed the minimum os version checks from
 all my ports, so anyone can now check if darwin8 can use the darwin12
 versions of the headers ports.

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Ticket URL: <https://trac.macports.org/ticket/38684#comment:7>
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