[GHC] #2373: Build fails to pass locations of external tools to libraries

[GHC]

#2373: Build fails to pass locations of external tools to libraries
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    Reporter:  bos      |       Owner:          
        Type:  bug      |      Status:  new     
    Priority:  normal   |   Component:  Compiler
     Version:  6.8.2    |    Severity:  normal  
    Keywords:           |    Testcase:          
Architecture:  Unknown  |          Os:  Unknown 
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 I am trying to build GHC 6.8.3, and the default version of Haddock on my
 system is 2.0.0.0.  I have Haddock 0.9 installed as
 `/usr/bin/haddock-0.9`, but `libraries/Makefile` does not pass this
 information down to the libraries it is building.  I am already running
 the top-level `configure` script with the `HaddockCmd` environment
 variable set appropriately (and verified in the output from `configure`
 and inspection of `mk/config.mk`), so it's a simple matter of passing the
 information along.

 I have attached a patch that passes the build's configured versions of
 Alex, Haddock, and Happy down to Cabal for each library.  This fixes the
 problem for me, and I think it ought to apply to HEAD as well as to the
 6.8 branch.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2373>
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