[darcs-users] new GHC support policy draft
kowey at darcs.net
Thu Mar 18 13:39:37 UTC 2010
Below is the second draft of our GHC version support, hopefully taking
in account points raised by everybody.
It appears to be a balancing act: for users, it's sometimes important to
run new Darcs on servers; for developers trying to support too many GHC
versions is problematic. This new policy leans slightly more towards
the developer end [the better to server users!] but introduces new
safeguards to compensate.
If there are no serious objections to this, I'd like to enshrine this on
the wiki as our new policy :-)
Thanks for all the comments!
Things we have to consider
* Support here means ensuring that Darcs build on this (buildbots)
and also accepting bugs for Darcs built against these versions
* Users to support:
- MacOS X / Windows: I think the latest Haskell Platform is a
safe bet here
- Folks on Desktop Linux: Recent but not bleeding edge GHC
The 6-monthly distributions like Fedora and Ubuntu are a
good guide here
- Folks on Servers: Old GHC not often available through
* Changes in GHC make supporting many versions of GHC extremely
inconvenient, which impairs our ability to make Darcs better
* Supporting many versions of GHC is also potentially unsafe, as
it leaves the door open to many untested ways of building Darcs.
1. We will support the last two stable branches of GHC.
Tying this to the GHC and not to any particular distribution
makes the number of GHC versions we promise to support a fixed
quantity. This keeps Darcs hackers sane so they can focus on
2. We will provide a human-readable recipe for installing Darcs on the
current Debian Stable on http://wiki.darcs.net/Debian. We choose
Debian Stable simply because it's a good guide for what people
running servers can be expected to have.
Before we jettison a GHC version, we will first ensure that a non
Darcs hacker can use the recipe to successfully install Darcs. We
will also try to make this procedure as simple and convenient as
possible. For example, we could write it in a way that prefers in
- what Debian Stable provides
- what Debian backports provide
- the GHC bindist
- source tarballs
Eric Kow <http://www.nltg.brighton.ac.uk/home/Eric.Kow>
PGP Key ID: 08AC04F9
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