[MacPorts] #41782: Default to apple-gcc-4.2 on Tiger

[MacPorts]

#41782: Default to apple-gcc-4.2 on Tiger
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.2.99
Resolution:                |   Keywords:  tiger
      Port:                |
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Comment (by ryandesign@…):

 Replying to [comment:1 jeremyhu@…]:
 > bootstrapping is the biggest annoyance.  You'll certainly need to add
 apple-gcc-4.2 to compiler.blacklist in its own Port if it isn't there
 already.  That should allow the fallback to building it with gcc-4.0 on
 the first pass.

 I set up new Tiger test environment today and am installing everything
 with this change in place. So far so good.

 My plan is for gcc-4.0 to not be in the fallback list by default, since
 gcc-4.0 won't work for whole bunches of ports on Tiger once I make the
 change in #40656. So I just set configure.compiler to gcc-4.0 explicitly.
 I also had to do the same in apple-gcc42's dependency gcc_select, because
 although it doesn't use a compiler, MacPorts base doesn't know that so it
 would still add the (circular) build dependency.

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Ticket URL: <https://trac.macports.org/ticket/41782#comment:4>
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