duncan.coutts at worc.ox.ac.uk
Wed Feb 25 07:59:58 EST 2009
On Wed, 2009-02-25 at 10:58 +0000, Neil Mitchell wrote:
> Hi Duncan,
> >> i.e. cabal accepts the --builddir command, but the setup that cabal
> >> builds doesn't. Why?
> > Hmm. Does your ghc-6.8 have Cabal-188.8.131.52 registered? If you built
> > Cabal-184.108.40.206 and cabal-install with ghc-6.10 but not also for 6.8 then
> > cabal-install will be forced to pick an older Cabal lib when compiling
> > Setup scripts for 6.8.
> Cabal-220.127.116.11 is registered and built with ghc-6.8.3 - I installed it
> with Cabal seconds before running this example.
Did you see from the -v3 output what version it was actually using?
If you compile Setup.hs manually using -package Cabal-18.104.22.168 does the
--builddir= flag work? It should do.
> My cabal.exe comes from the hackage website, the binary you put up
> some time ago. I guess that is probably the issue.
What version is that then?
I'm interested because we've not actually worked out why the problem was
> > Really of course we should notice this earlier and complain that we
> > cannot use this new feature while using the older lib version. We should
> > file a ticket about that. In fact the whole issue with what the Setup
> > command line must accept is a tricky issue when it comes to working with
> > custom build systems.
> Meh. Custom build scripts are brittle and evil - in my particular case
> the custom build script was trivial so adding build-type:Simple fixes
> everything. However, I'd like to know (before I push a change) that
> build-type:Simple will work out the box with the Cabal that got
> installed with ghc-6.8.3.
> So that means figuring out what Cabal ghc-6.8.3 shipped with,
> and which Cabal can cope with build-type:Simple - is there any way to
> figure that out in general, and what is the answer in this specific
If you're lucky, "cabal check" will tell you that you're using features
but not specifying a high enough cabal-version: >=x.y value. Otherwise
you can consult old versions of the user guide or the source.
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