On 28 April 2014 18:40, Roman Cheplyaka <roma@ro-che.info> wrote:

* Simon Marlow <marlowsd@gmail.com> [2014-04-28 09:26:23+0100]
> No, the idea would be to use hs-source-dirs like this:
>
> hs-source-dirs: A.B.C=src
>
> Cabal just passes this in a -i option to GHC, so it almost Just Works,
> except that Cabal needs to preprocess some source files so it needs to find
> them, and also sdist needs to find source files.

In that case, I'm in favour of this proposal.

Please consider the reversed syntax instead:

hs-source-dirs: src=A.B.C

I find it more intuitive, because A.B.C becomes sort of an optional parameter,
the empty prefix being its default value.

src=A.B.C implies a 1-1 mapping between a srcdir and a module root, whereas A.B.C=src allows different modules (eg. all a project) to live in the same dir:

Graphics.UI.Gtk=src System.IO.EEG=src Game.Flappy2048=src

Conrad.