[Haskell-cafe] Cabal: other-modules necessary?

[Brandon Allbery]

Cabal doesn't know. GHC does, and is producing the
missing-home-modules warning. And even there, you're getting lucky; it
could miss one. Only the link step knows for certain what is missing,
because you would need whole-program compilation to reliably catch it
during the compile step.

On Fri, Sep 16, 2022 at 5:24 AM Tom Ellis
<tom-lists-haskell-cafe-2017 at jaguarpaw.co.uk> wrote:
>
> On Fri, Sep 16, 2022 at 10:47:47AM +0200, Volker Wysk wrote:
> > The cabal user guide says (in section 6.2.12): "Every module in the package
> > must be listed in one of other-modules, library:exposed-modules or
> > executable:main-is fields."
> >
> > However, I only get a warning message, when I comment out the other-modules
> > field in my .cabal file. The program compiles. This is the message:
> >
> > <no location info>: warning: [-Wmissing-home-modules]
> >     These modules are needed for compilation but not listed in your .cabal
> >     file's other-modules:
> >         Hsskripte Sicherung SicherungAktionen Text Wahl Zeit
> >
> > Is it really necessary to specify all the imported modules? If so, why does
> > the program compile? Can that warning message be turned off?
>
> In response to all the sibling replies at once, is there a good reason
> for this behaviour?  Succeeding but then failing later with obscure
> errors (once the original warning message is nowhere to be seen) seems
> like the worst of all worlds.  Suppose cabal errored here and failed
> to proceed.  What would be the downside of that (besides backward
> incompatibility)?
>
> Tom
> _______________________________________________
> Haskell-Cafe mailing list
> To (un)subscribe, modify options or view archives go to:
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
> Only members subscribed via the mailman list are allowed to post.



-- 
brandon s allbery kf8nh
allbery.b at gmail.com