On Mon, Apr 12, 2010 at 4:00 AM, Duncan Coutts <duncan.coutts@googlemail.com
wrote:
On Sun, 2010-04-11 at 14:28 -0700, Jason Dagit wrote:
I've noticed another type of diamond dependency problem. Suppose I build and install Foo today and it depends on Bar 2.0.0. In a week, I install Bar 2.0.1. Next I installed Baz that also depends on Bar, and it gets Bar 2.0.1. When I install a package that depends on Foo, Baz, and possibly Bar, then cabal won't be able to figure out proper dependencies because Foo needs one version of Bar and Baz needs a different version.
That's exactly the problem that cabal-install solves. It will rebuild one or the other of Foo and Baz so that the dependency on Bar is consistent.
Weird. This has not been my experience. Jason