[Haskell-cafe] some problem with Cabal
qiqi789 at gmail.com
Wed Mar 9 03:57:15 CET 2011
Daniel Fischer wrote:
> On Wednesday 09 March 2011 02:51:35, qiqi wrote:
>> I used cabal install xmobar --flags="all_extensions" .
> In order, the following would be installed:
> containers-0.3.0.0 (new version)
> filepath-184.108.40.206 (new version)
> directory-220.127.116.11 (reinstall) changes: filepath-18.104.22.168 -> 22.214.171.124
> hinotify-0.3.1 (new package)
> mtl-126.96.36.199 (new version)
> network-188.8.131.52 (new version)
> process-184.108.40.206 (reinstall) changes: filepath-220.127.116.11 -> 18.104.22.168
> stm-22.214.171.124 (new package)
> syb-0.3 (new package)
> X11-126.96.36.199 (new package)
> time-1.1.4 (new version)
> random-188.8.131.52 (reinstall) changes: time-184.108.40.206 -> 1.1.4
> haskell98-220.127.116.11 (reinstall)
> utf8-string-0.3.6 (new package)
> X11-xft-0.3 (new package)
> libmpd-0.5.0 (new package)
> xmobar-0.12 (new package)
> I haven't looked further, but libmpd is at least partially responsible, it
> depends on filepath < 1.2, time < 1.2 and a couple other old packages.
>> Is it true that every package installed from hackage should not install
>> any package, which already exists in the global with the same version
>> number , in the local db?
> Generally, it shouldn't (and doesn't), but here some packages have to be
> reinstalled because they have to be built against different dependencies.
> I'd prefer cabal install to refuse here (overridable with a --force flag)
> because reinstalling boot libs (containers, filepath, directory, process,
> time) tends to be a bad idea.
> However, xmobar is an executable and no library, so if you unregister the
> packages (from the user db!) after installing before they can cause
> trouble, you should be fine (but no guarantees).
> This is exactly what I am doing. I unregistered those packages but kept
> the xmobar's executable under ~/.cabal/bin. It works fine.
> Thanks Daniel. I appreciate it!
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