[GHC] #4172: GHC build failes when BuildFlavour = prof is used

[GHC]

#4172: GHC build failes when BuildFlavour = prof is used
----------------------------------+-----------------------------------------
  Reporter:  Phyx-                |          Owner:  simonpj         
      Type:  bug                  |         Status:  closed          
  Priority:  high                 |      Milestone:  6.14.1          
 Component:  Compiler             |        Version:  6.13            
Resolution:  fixed                |       Keywords:                  
  Testcase:                       |      Blockedby:                  
Difficulty:                       |             Os:  Unknown/Multiple
  Blocking:  4237                 |   Architecture:  Unknown/Multiple
   Failure:  Building GHC failed  |  
----------------------------------+-----------------------------------------
Changes (by simonpj):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 The bug here is really that DPH uses Template Haskell, and Template
 Haskell doesn't work when profiling.  So if you use a profiled stage-2
 compiler, you can't use that compiler to compile DPH.  So it's really a
 build-system problem.  Simon and I made this patch:
 {{{
 Fri Aug 13 15:00:21 BST 2010  simonpj at microsoft.com
   * Do not build DPH when GhcProfiled (fixes #4172)

   Reason: DPH uses Template Haskell and TH doesn't work
   in a profiled compiler
 }}}
 While we were at it, we did this too
 {{{
 Fri Aug 13 15:01:52 BST 2010  simonpj at microsoft.com
   * Delete GhcLibProfiled

   Simon M and I looked at this, and we think GhcLibProfiled is
   (a) not needed (b) confusing.

   Ian should review.

   Really, if GhcProfiled is on we should also
   check that 'p' is in the GhcLibWays
 }}}
 The lint error Ian found isn't the source of the original seg-fault, but
 it too is fixed by the fix to #4237.

 Finally, we should do somethign better than seg-fault if you try to use TH
 with a profiled compiler. I've opened #4255.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4172#comment:10>
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