[GHC] #7841: Stage1Only conditional program/package building

[GHC]

#7841: Stage1Only conditional program/package building
-------------------------------+--------------------------------------------
  Reporter:  elliottt          |          Owner:                  
      Type:  feature request   |         Status:  closed          
  Priority:  normal            |      Milestone:                  
 Component:  Build System      |        Version:  7.7             
Resolution:  worksforme        |       Keywords:  Stage1Only      
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by elliottt):

 It looks like libraries/base_dist-install_NOT_NEEDED would prevent base
 from being built at all, instead of just with a specific stage of the
 compiler.  This should be good enough for libraries that shouldn't be
 built at all for the target of the stage 1 compiler, but wouldn't defining
 it for a utility program like hsc2hs prevent it from being built with
 stage 0?

 I hadn't noticed the guard on the call to build-package in
 libraries/array/ghc.mk, and just assumed that it would be built with the
 stage 2 compiler.

 In the case where stage 2 doesn't get build, what causes the RTS to build,
 without all_rts being a dependency of all?

 I'm very interested in getting some version of Stage1Only working, and am
 happy to do the work to implement it.  Could you give me a little guidance
 so that I can submit a better patch?

 Thanks!

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7841#comment:3>
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