[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
---------------------------------+------------------------------------------
  Reporter:  guest               |        Owner:                   
      Type:  enhancement         |       Status:  new              
  Priority:  normal              |    Milestone:  cabal-install-0.8
 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):

 The new patch (see attachment) adds world-file support for the 0.7 HEAD
 branch.
 Whenever you install a package, an entry is added to the world-file,
 storing the specified package-name, package-version, and user flags.
 For example, the entry generated by
 {{{
 # cabal install stm-io-hooks --flags="-debug"
 }}}
 looks like this:

 {{{
 stm-io-hooks -any --flags="-debug"
 }}}
 The requires dependencies of a packge, however, are not recorded in the
 world file, only the packages explicitly requested by the user.

 To rebuild all previously installed packages (e.g. on updating GHC),
 use
 {{{
 # cabal install world
 }}}

 The previous version of this patch supported the "cabal upgrade world"
 command, which is now disabled until "cabal upgrade" is fixed.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/199#comment:10>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects