[MacPorts] #19739: ghc: uses happy during configure

[MacPorts]

#19739: ghc: uses happy during configure
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 Reporter:  ryandesign@…             |       Owner:  gwright@…           
     Type:  defect                   |      Status:  new                 
 Priority:  Normal                   |   Milestone:                      
Component:  ports                    |     Version:  1.7.1               
 Keywords:                           |        Port:  ghc                 
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Comment(by ryandesign@…):

 Replying to [comment:1 gale@…]:
 > GHC itself is written in Haskell. Every modern version of GHC requires a
 fairly recent previous version of itself to be already installed in order
 to compile. So this circularity is inherent to GHC, far beyond the issue
 with happy.

 Well I know, but the ghc port does download a bootstrap version of ghc in
 order to compile the real version of ghc. So this is not at issue here.

 > It would be nice if the way that MacPorts deals with this issue were
 documented somewhere. If it already is documented, it would be nice if the
 port description for ghc would include a link to that page.

 I'm not sure how much of this is documented, but ports cannot declare
 dependencies on themselves, it is not proper for a port to use a previous
 installed version of itself, it is not ok for a port to use software on
 which it does not declare a dependency, and there cannot be circular
 dependencies.

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Ticket URL: <http://trac.macports.org/ticket/19739#comment:2>
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