[GHC] #4253: stage1 compiler uses packages out of the user database

[GHC]

#4253: stage1 compiler uses packages out of the user database
-------------------------------+--------------------------------------------
    Reporter:  elliottt        |       Owner:                     
        Type:  bug             |      Status:  new                
    Priority:  normal          |   Component:  Build System       
     Version:  6.12.3          |    Keywords:                     
    Testcase:                  |   Blockedby:                     
          Os:  Linux           |    Blocking:                     
Architecture:  x86_64 (amd64)  |     Failure:  Building GHC failed
-------------------------------+--------------------------------------------
 When building 6.12.3 with a version of 6.12.3 that has packages registered
 in the user package database, the stage1 compiler started preferring
 versions of packages that were registered in the user package database.

 Steps to reproduce:

 1. install 6.12.3 binary distribution
 2. install mtl-1.1.0.2 in the user package database
 3. build 6.12.3 from source, using the version from step 1
 4. the build should fail when it gets to haskeline

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4253>
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