[MacPorts] #20132: ghc missing variable definitions in 10.6

[MacPorts]

#20132: ghc missing variable definitions in 10.6
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 Reporter:  snc@…             |       Owner:  gwright@…           
     Type:  defect            |      Status:  assigned            
 Priority:  Normal            |   Milestone:                      
Component:  ports             |     Version:  1.8.0               
 Keywords:  snowleopard       |        Port:  ghc                 
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Comment(by gwright@…):

 >
 > Replying to [comment:100 gwright@…]:
 > > I'd like to have the 64 bit version as the default.  For users that
 need a 32 bit compiler (for example, to make binaries that will run both
 on Leopard and Snow Leopard) I will make a new port, ghc-sl32.  You will
 be able to install both ports simultaneously.  (My original idea of making
 a 32 bit compiler on Snow Leopard a variant made it impossible to have
 both compilers at the same time.)
 >
 > Instead of making a separate ghc-sl32 port, can't you make the ghc port
 respect the build_arch and universal_archs variables and do it the way
 every other port in MacPorts does it?

 No, it is unfortunately not yet possible to make ghc do this.  The
 underlying problem is that ghc cooks its host platform into the code
 generator.  You can't, for example, output 64 bit code using a ghc that
 was built as a 32 bit binary (and vice versa).

 This is a known problem.  An old cross-compilation system that never
 worked and has been ripped out.  Parts of a new one are in 6.12.x, but are
 not working yet.

 At the moment, the only way to generate binaries for both 32 and 64 bit
 platforms is to have two compilers.

 I have mentioned these problems to the upstream maintainers and they have
 given it somewhat more attention of late.  But most of their efforts are
 going to parallelism and type hackery.

-- 
Ticket URL: <http://trac.macports.org/ticket/20132#comment:106>
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