[Hackage] #199: when installing a new version of GHC, there should be a way to upgrade my packages

[Hackage]

#199: when installing a new version of GHC, there should be a way to upgrade my
packages
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  Reporter:  guest               |        Owner:                 
      Type:  enhancement         |       Status:  new            
  Priority:  normal              |    Milestone:  Cabal-1.8      
 Component:  cabal-install tool  |      Version:  1.2.3.0        
  Severity:  normal              |   Resolution:                 
  Keywords:                      |   Difficulty:  easy (<4 hours)
Ghcversion:  6.8.2               |     Platform:  Linux          
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Comment (by thaldyron):

 Replying to [comment:7 duncan]:
 > Replying to [comment:6 Saizan]:
 > > How does this interact with keeping multiple compilers/versions side
 by side?
 > > maybe we should have a world file for each one and be able to install
 the packages in world-compiler1 using compiler2
 >
 > There being just one world file is a feature, not a bug :-). It means
 that moving between compilers is easy. It's not likely that you want some
 things in one but not another. What is more likely is that there are some
 things that simply cannot be installed with an older version.

 I agree with that; if different world-files are really necessary, you can
 always (albeit manually) select them with the --world-file flag.

 Btw: Maybe adding a "--oneshot" install-flag makes sense for installing
 without updating world.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/199#comment:8>
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