[Haskell-cafe] Using Cabal during development

Limestraël limestrael at gmail.com
Tue Feb 9 10:03:20 EST 2010

Okay, I juste solved issue (1) :

The package compiled through Cabal has its information stored in the
dist/package.conf.inplace file.
I can then compile my main by doing :
ghc --make -package-conf dist/package.conf.inplace main.hs
I just don't know if it's really the way I'm supposed to do this.

Nevertheless, issue (2) remains...

Limestraël wrote:
> Okay, so then I have some troubles regarding the compilation of my
> executable:
> First, what do you think is the simpler : (1) build only the library
> through cabal-install and then the executable with ghc (it isn't to be
> distributed with the lib), or (2) add both to my 
> http://old.nabble.com/file/p27515830/HSFML.cabal .cabal file  and build
> them in the same time with a 'cabal build' ?
> Because I've tried both methods, and have had issues with both :
> (1) after a 'cabal build', ghc doesn't know where to find my library --
> whereas cabal-install displays 'Registering HSFL-1.5...' at the end of the
> build -- when I do 'ghc --make main.hs'. I'm not gonna do a 'cabal
> install' whenever I alter my code, am I?
> (2) well, then, when building, if I don't specify that my executable
> depends on my lib, I got:
> SFML/Direct/Graphics.hs:51:7:
>     Could not find module `SFML.Direct.Types.Enums':
>       It is a member of the hidden package `HSFML-1.5'.
>       Perhaps you need to add `HSFML' to the build-depends in your .cabal
> file.
>       it is a hidden module in the package `HSFML-1.5'
>       Use -v to see a list of the files searched for.
> and if I do what it asks me to do (to add the line 'Build-Depends:  HSFML'
> in the 'Executable' section of my .cabal file), I'm told when 'cabal
> build'ing:
> cabal: internal error: could not construct a valid install plan.
> The proposed (invalid) plan contained the following problems:
> The following packages are involved in a dependency cycle HSFML-1.5
> Miguel Mitrofanov wrote:
>> With cabal-install, usually.

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