[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
 Keywords:                |       Port:
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 Ever since MacPorts 2.3.0, the default compiler on Mac OS X 10.4 is the
 MacPorts-provided version of the Apple GCC 4.2 compiler, because the
 latest Apple GCC provided by Tiger's Xcode is 4.0, which was deemed too
 old.

 However, if building on Snow Leopard using the Mac OS X 10.4u SDK,
 MacPorts uses Apple GCC 4.0 from Xcode.

 browser:trunk/base/src/port1.0/portconfigure.tcl at 138099:488-492#L473

 Why does it do this? This means that software built on Tiger uses a newer
 compiler than software built for Tiger on Snow Leopard. Shouldn't it use
 Apple GCC 4.2 from Xcode, or from MacPorts, to match what would happen
 when building directly on Tiger?

 I assume this is simply a remnant of when MacPorts < 2.3 used Apple GCC
 4.0 on Tiger.

 Jeremy, you made this change in r92159 but no ticket number was referenced
 in the commit message. I remember Snow Leopard issuing an error saying the
 10.4u SDK is not compatible with gcc 4.2, but that can't be true or else
 it wouldn't work directly on Tiger either, but it does work there.

-- 
Ticket URL: <https://trac.macports.org/ticket/48345>
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