[Hackage] #604: a feature to explicitly allow multiple versions of a single dependency

[Thomas DuBuisson]

If you didn't have them both as executables at the same time but built
each separately based on a flag then this should work.

On Wed, Nov 11, 2009 at 11:40 AM, Hackage <trac at galois.com> wrote:
> #604: a feature to explicitly allow multiple versions of a single dependency
> ----------------------------+-----------------------------------------------
>  Reporter:  guest          |        Owner:
>      Type:  enhancement    |       Status:  new
>  Priority:  normal         |    Milestone:
>  Component:  Cabal library  |      Version:  1.6.0.1
>  Severity:  normal         |     Keywords:
> Difficulty:  unknown        |   Ghcversion:  6.10.1
>  Platform:  Linux          |
> ----------------------------+-----------------------------------------------
>  I wanted to build two executables for comparing the performance difference
>  between happstack-server-0.3.4 and happstack-server-0.4. So I wrote below
>  cabal file but found that cabal cannot build what I want. Here is the
>  output for "cabal configure":
>
>  {{{
>  aycan at fgt:~/haskell/tests/happstack-tests$ cabal configure
>  Resolving dependencies...
>  Configuring happstack-tests-0.1...
>  cabal: At least the following dependencies are missing:
>  happstack-server ==0.4 && ==0.3.4
>  }}}
>
>
>  {{{
>  Name: happstack-tests
>  Version: 0.1
>  Author: Aycan iRiCAN <aycan.irican at core.gen.tr>
>  Stability: Experimental
>  Category: Web
>  Synopsis: Tests for Happstack Packages
>  Cabal-version: >= 1.6
>  Build-Type: Simple
>
>  Flag base4
>     Description: Choose the even newer, even smaller, split-up base
>  package.
>
>  Executable hello-0.3.3
>   Main-Is: Hello.hs
>   Hs-source-dirs: happstack-server
>   GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused-
>  imports
>   Build-depends:
>      base
>    , happstack-server == 0.3.4
>
>  Executable hello-0.4
>   Main-Is: Hello.hs
>   Hs-source-dirs: happstack-server
>   GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused-
>  imports
>   Build-depends:
>      base
>    , happstack-server == 0.4
>  }}}
>
> --
> Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/604>
> Hackage <http://haskell.org/cabal/>
> Hackage: Cabal and related projects
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>