Oddity with 'cabal install' in GHC 7.4.1

Thomas DuBuisson thomas.dubuisson at gmail.com
Sun Feb 5 07:22:59 CET 2012

On Sat, Feb 4, 2012 at 9:51 PM, Andres Löh <andres.loeh at googlemail.com> wrote:
> Hi Conal.
> On Sun, Feb 5, 2012 at 12:36 AM, Conal Elliott <conal at conal.net> wrote:
>> Since upgrading to 7.4.1, if I 'cabal install' successfully and then 'cabal
>> install' a second time without first doing a 'ghc-pkg unregister
>> <package-name>', I get the following complaint:
>> [...]
> The warning is intended to prevent you from breaking your system
> without knowing that you know that you're running a potentially
> dangerous cabal invocation.
> The --force-reinstalls flag should always make it build. If it
> doesn't, it's a bug.
> In addition, I'm planning to make the warning a little bit less
> aggressive before the release.

Before the release of what? (seeing as GHC 7.4.1 has been released)

>> The only path I've found so far that's willing to rebuild or even say
>> nothing needs rebuilding (when nothing does) is to 'ghc-pkg unregister' and
>> then 'cabal install' again. I'm getting the same behavior on Red Hat 5 and
>> Mac OS 10.6.8, both compiled from sources.
> I'd be surprised if the OS matters. But as I said, I've not yet
> encountered a situation where it wouldn't build given
> --force-reinstalls.
> Cheers,
>  Andres
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