Reinier Lamers <[email protected]> writes:
> * We depend on a new version of haskeline, that depends on a new version of
> utf8-string
> * We specify a utf8-string dependency in darcs.cabal, only to make sure
> the version haskeline uses is recent enough.
>
> The second option feels dirty, and I'm not sure if it works (if I compile
> haskeline against a buggy utf8-string, and then install 0.3.6 to keep the
> darcs installation happy, won't darcs still call the buggy utf8-string via
> haskeline?). That's why I suggested a new haskeline release.
As I understand it, the point of this is to prevent users accidentally
building against an old utf8-string which has a known bug.
Something similar was done for the 2.3.1 release with hashed-storage.
Since the newer hashed-storage isn't packaged for Debian yet, I can't
package Darcs 2.3.1 for Debian -- effectively meaning that the
well-meaning dependency tightening blocked ALL other bugfixes in 2.3.1.
(Hm... on reflection, I suppose I could've made a Debian-specific patch
to lower hashed-storage's lower bound in darcs.cabal.)
Anyways, the idea in my head at the start of this post was: "gee,
wouldn't it be nice if there were build-recommends?" It occurred to me
that this might be approximated by having with a curl-pipelining-style
flag:
flag no-known-bugs-in-deps
description: when set to false, allow compilation against
library versions with known bugs.
default: True
if flag(no-known-bugs-in-deps)
depends: foo >= 1.1
else
depends: foo >= 1.0
But I'm not sure how to make cabal emit the warning... I thought I
saw HTTP or curl emit one sometime. Maybe they do it by
if ! flag(no-known-bugs-in-deps)
cflags: -DNAUGHTY_USER
And then in a .hs file, something like
#ifdef NAUGHTY_USER
# warn You're linking against a buggy library!
#endif
Given my parenthetical observation above is an adequate solution, I
suspect my rambling can simply be ignored. Posting anyway just in case
there's a good idea in there somewhere.
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