[Haskell-cafe] Cabal version constraint seems to be ignored.

[Rogan Creswick]

On Wed, Jan 22, 2014 at 4:43 AM, Carlo Hamalainen <
carlo at carlo-hamalainen.net> wrote:

> If I hide Cabal-1.18.1.2 then things work ok:
>
>
Does the behavior change if you build with a sandbox? (without hiding
either Cabal via ghc-pkg?)

If I had to hazard a guess, I'd say that the inability to specify
dependencies for the build process are causing this problem, even though
you're using build-type: simple; one cabal is used to set cabal-specific
details in the cabal_macros.h file (which I'm assuming you're using
somewhere in the source?) and another is picked based on the build-depends.

That's just a guess, though... and if true, it's a wrinkle in the
interactions between build-system dependencies and program build-time
dependencies that I haven't run across before (even with Cabal-dev!).

--Rogan


> $ ghc-pkg hide Cabal-1.18.1.2
> $ cabal install
> $ ghc-imported-from .... (runs as expected)
>
> But I can't expect a user to know that they have to hide Cabal-1.18.1.2.
>
> Is this actually a GHC bug or have I stuffed up my
> ghc-imported-from.cabal file?
>
> Thanks,
>
> --
> Carlo Hamalainen
> http://carlo-hamalainen.net
>
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