Hi Bryan,
On 8 Feb 2013, at 11:53, Bryan O'Sullivan wrote:
> On Fri, Feb 8, 2013 at 1:29 AM, Tim Watson <watson.timo...@gmail.com> wrote:
> Likewise, I'm in the process of setting up Elastic Bamboo on EC2 for Cloud
> Haskell and would be very interested in seeing how you've dealt with multiple
> versions of GHC.
>
> It's easy to parameterize builds in Jenkins based on different values of an
> environment variable, so Johan and I just have different versions of GHC
> installed side by side, and then set $GHC_VERSION to "7.6 7.4 7.2 7.0 6.12"
> (or whatever), put /usr/local/$GHC_VERSION/bin at the front of $PATH, and the
> right thing happens.
Ok cool, that's pretty much what I had in mind but I wasn't sure about
installing dependencies and using cabal-install. In my development environment
I quickly found that installing multiple GHCs and haskell-platform releases got
a bit messy, so I was wondering if there was a recognised 'best way' to do
this. I'll probably replicate what I've done with other things (such as Erlang)
and manage it with ${PREFIX}/ghc/versions/... and symlink
${PREFIX}/ghc/current/... to avoid the path switching. Hopefully telling
cabal-install to use ${PREFIX}/ghc/current/lib will 'just work' when installing
dependencies as I switch between ghc versions.
Cheers!
Tim
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