[Haskell-cafe] Cabal and `main-is` field

[Gwern Branwen]

On Sun, Mar 1, 2009 at 12:10 PM, Manlio Perillo <manlio_perillo at libero.it> wrote:
> Gwern Branwen ha scritto:
>>
>> [...]
>>
>> You can hoist the common build-depends out of the executable stanzas. ie.
>> from xmonad-utils.cabal:
>>
>> build-depends:      base<4, X11>=1.3, ghc>=6.8, unix, random>=1.0
>> ...
>> executable:         hxsel
>> main-is:            Hxsel.hs
>> hs-source-dirs:     src
>> ghc-options:        -funbox-strict-fields -Wall
>> ghc-prof-options:   -prof -auto-all
>>
>> executable:         hxput
>> main-is:            Hxput.hs
>> hs-source-dirs:     src
>> ghc-options:        -funbox-strict-fields -Wall
>> ghc-prof-options:   -prof -auto-all
>> ....
>>
>> Notice that though hxput and hxsel need the packages in the top-level
>> build-depends, they don't need to declare it.
>>
>
> Thanks.
> From documentation it was not clear this feature.
>
> However, what happens if hxput add a build-depends field?
> Will this override the "global" field?
>
>
>
> Manlio Perillo

It doesn't override, but adds to. If the toplevel declares 'base', and then hxput does 'build-depends: random', hxput will be built against 'base, random'.

-- 
gwern
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