Hi Conal.
On Sun, Feb 5, 2012 at 12:36 AM, Conal Elliott
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.
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