GHC HEAD vs Hackage, panic-free edition

Nicolas Trangez nicolas at
Tue Oct 15 14:40:29 UTC 2013

On Tue, 2013-10-15 at 10:27 -0400, Edward Kmett wrote:
> Carter and I started a conversation with the travis-ci guys about how to
> support multiple Haskell versions a year and a half ago, but it fizzled out
> and not much came of it.
> At last check they were definitely leaning more towards supporting a few
> haskell-platforms as they came out rather than something so
> maintenance-heavy as tracking HEAD.

FWIW: In the OCaml ecosystem Anil Madhavapeddy created a set of Ubuntu
PPAs, each containing a different combination of OCaml compiler version
& the 'opam' package manager, which makes it trivial to run TravisCI
jobs against these different versions.


I switched our original setup (which set up a compiler from scratch in
the TravisCI env for every job, wasting time & resources) to this system
for Arakoon, and it works like a charm, so if similar PPAs would be
available for different GHC and HP versions, and one some system which
e.g. takes nightly binaries & uploads them to the PPA for 'head' builds,
things could work out nicely.


> -Edward
> On Tue, Oct 15, 2013 at 6:51 AM, Sven Panne <svenpanne at> wrote:
> > 2013/10/15 Bryan O'Sullivan <bos at>:
> > > It's always good to fix this kind of thing early, as doing so makes it
> > > possible to find even sooner the real problems that will otherwise remain
> > > hidden by mickey mouse stuff like bad package dependencies. Finding
> > problems
> > > before a release is cut is way cheaper (even for open source volunteers)
> > > than discovering them once the code is in the wild.
> >
> > Agreed, but how are package maintainers supposed to find out problems
> > early without much hassle? For my part, I am using Travis CI, but
> > AFAICT it supports only GHC 7.4.1
> > ( There might be
> > some cruel hacks like downloading some binary builds from somewhere
> > etc., but this is not a real solution and takes ages.
> >
> > It would be very cool if Travis CI supported multiple GHC versions,
> > including a version close to HEAD.
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