[Haskell-cafe] Issue building with ghc-9.8.2 and packages unix, directory, filepath and os-string

Brandon Allbery allbery.b at gmail.com
Sat Jun 1 15:26:25 UTC 2024

Right, the point here is that `allow-newer` _breaks the solver_ and in
particular breaks packages that require it to obey upper bounds (like
`unix`) to produce a valid build plan. Using it blindly is therefore a very
bad idea.

On Sat, Jun 1, 2024 at 11:11 AM Henning Thielemann <
lemming at henning-thielemann.de> wrote:

> On Sat, 1 Jun 2024, Daniel Trstenjak wrote:
> > Looking at the compile error of the unix package, it looks like it gets
> > the wrong combination of filepath and os-string packages, resulting in
> > the missing symbols. This depends on the os-string flag, either the unix
> > package gets the older filepath package containing these symbols or the
> > newer one without them and additionally the os-string package now
> > containing the symbols.
> >
> > This handling with the os-string flag feels wrong to me and therefore
> > cabal can‘t resolve the right dependencies.
> It would work, but --allow-newer ignores upper version bounds and thus can
> choose old filepath with new os-string.

brandon s allbery kf8nh
allbery.b at gmail.com
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