[MacPorts] #52537: hatari - fix for build on Snow Leopard without Xcode 4.2

[MacPorts]

#52537: hatari - fix for build on Snow Leopard without Xcode 4.2
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  Reporter:  ken.cunningham.webuse@…  |      Owner:  macports-tickets@…
      Type:  defect                   |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:  2.3.4
Resolution:                           |   Keywords:  haspatch maintainer
      Port:  hatari                   |
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Comment (by larryv@…):

 Replying to [comment:11 ken.cunningham.webuse@…]:
 > In the end I forced it to macports-clang-3.7 or newer, as most people
 > would / should likely have that clang version on Snow Leopard.

 This is not a safe assumption to make. Given that 3.7 is (a) not in the
 default fallback list for Xcode 3.2 and (b) requires manual bootstrapping,
 3.4 is almost certainly more likely to be present.

 > Even when I blacklisted { clang < 211 } the system kept choosing
 > xcode's clang. I tried bumping the number up to 500, and it
 > '''still''' chose xcode's clang, even though i have macports-clang-3.7
 > installed. Only when I blacklisted all clang did it ignore xcode's
 > clang

 This doesn’t sound right. Did you add the compiler_blacklist_versions-1.0
 portgroup? Base doesn’t support version blacklisting on its own.

 > and then it started installed macports-clang-3.4 (even though
 > macports-clang-3.7 was there).

 MacPorts does not just use whatever compiler happens to be there. It
 follows the combination of blacklist/whitelist/fallback list, which is
 deterministic.

 > I understand in a rudimentary way how the logic for this goes, but if
 > you're going to force a clang install on SL, it might as well be 3.7.

 This isn’t the place for this conversation, but I disagree because 3.7
 requires manual bootstrapping.

 I suspect you just didn’t use compiler_blacklist_versions-1.0. If you add
 that, blacklisting `{clang < 211}` should work fine.

-- 
Ticket URL: <https://trac.macports.org/ticket/52537#comment:12>
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