[GHC] #4469: recompilation or build system bug

[GHC]

#4469: recompilation or build system bug
---------------------------------+------------------------------------------
    Reporter:  igloo             |        Owner:              
        Type:  bug               |       Status:  merge       
    Priority:  normal            |    Milestone:  7.0.2       
   Component:  Build System      |      Version:  6.12.3      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by simonmar):

  * status:  new => merge


Comment:

 Fixed.  It was indeed a good bug to catch - probably led to real link
 errors in the wild.

 {{{
 Thu Dec  2 12:23:49 GMT 2010  Simon Marlow <marlowsd at gmail.com>
   * Fix a recomp bug: make classes/datatypes depend directly on DFuns
 (#4469)
   And remove the old mechanism of recording dfun uses separately,
   because it didn't work.

   This wiki page describes recompilation avoidance and fingerprinting.
   I'll update it to describe the new method and what went wrong with the
   old method:

 http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4469#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler