Re: [Haskell-cafe] CABAL: conditional executable?

Tue, 04 Mar 2008 01:17:16 -0800 


On Tue, 4 Mar 2008, Magnus Therning wrote:


I'm putting together a package consisting of 2 executables. Only one of
them is pure Haskell and thus buildable on all platforms, the other
relies on Windows API calls and can only be built on that platform.  I
found the “if os(...)” conditional in the CABAL docs but I'm having
problems getting it to do what I want.

if os(mingw32)
 executable foo
   ...

Results in the error “Section expected”.  Swapping the two lines like this

executable foo
 if os(mingw32)
   ...

results in “Setup.hs: Error: No 'Main-Is' field found for executable foo”.
It sounds like another instance of the case that parts of a package cannot be build under some circumstances. Keep in mind that other packages might rely on the installed second executable if they find that the package is installed. Thus, I guess it's better to extract the second executable to a different package for Window's only stuff.
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