[MacPorts] #48345: Building for 10.4u SDK on 10.6 uses gcc-4.0 even though building directly on 10.4 uses the newer apple-gcc-4.2

[MacPorts]

#48345: Building for 10.4u SDK on 10.6 uses gcc-4.0 even though building directly
on 10.4 uses the newer apple-gcc-4.2
-------------------------+--------------------------------
  Reporter:  ryandesign  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.3.99
Resolution:              |   Keywords:
      Port:              |
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Comment (by jmroot):

 The Xcode 3.1 release notes say:

 > GCC 4.2 is a new optional compiler with stricter C and C++ language
 enforcement, security enhancements, performance optimizations, and bug
 fixes over GCC 4.0. Requires the Mac OS X 10.5 SDK or "Current OS" SDK

 The Xcode 3.2 release notes say:

 > • Using the Clang compiler requires the 10.6 SDK
 > • Using GCC LLVM or GCC 4.2 requires the 10.5 SDK or 10.6 SDK


 See also e.g.:
 [https://lists.macports.org/pipermail/macports-
 users/2009-October/017218.html], #18765, #21511, #20948, #21662, #23149,
 #28046, #28800, #31946

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Ticket URL: <https://trac.macports.org/ticket/48345#comment:2>
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