Xdg module unbound with utop 2.13.0

[SnarkBoojum]

With utop 2.13.0:

utop # #use_output "dune utop";;
File "_none_", line 1:             
Error: Module `Xdg' is unavailable (required by `UTop_private')
Command exited with code 1.        

and indeed, if I try "open Xdg;;" in "utop", it fails -- I have to run "utop -I /usr/lib/ocaml/xdg" to make "open Xdg;;" work. But that doesn't fix the #use_output line...

[emillon]

Hi.
Thanks for the report. How did you install utop?

#use_output "dune utop";;

This is not something that's supposed to work: dune utop (from your shell) is supposed to start utop with the right modules loaded. Does that work?

(for #use_output, the command to call is #use_output "dune top" but it's a different thing)

[SnarkBoojum]

No, "dune utop" doesn't work -- since the project doesn't build completely and that's actually what I want to debug!

[emillon]

what happens when you run dune utop from the shell?

[emillon]

hmm, forget about this. does your debugging approach work with an older version of utop? (also, how did you install utop)

[SnarkBoojum]

I install utop with the Debian package -- I'm part of the team preparing it. It did work in previous versions. I can use this debugging trick with the regular ocaml toplevel, but as you know it's a bit uncomfortable to work with.

[SnarkBoojum]

When I run "dune utop", it just sits telling me the compilation isn't done... one file is missing - the one failing!

[emillon]

It did work in previous versions.

utop 2.13.0 added a dependency against xdg >= 3.9.0, have you added that dependency on the Debian side? If so, do you have a log of utop 2.13.0 being built with it?

[SnarkBoojum]

Well, xdg isn't a separate package -- it's shipped with the dune package. The relevant part of the log is:

make[1]: Entering directory '/home/jpuydt/Debian/build/utop-2.13.0'
dune build -p utop
make[1]: Leaving directory '/home/jpuydt/Debian/build/utop-2.13.0'

where I can only see that I should find a way to make the build more verbose on what it does!

But there are neither error nor warning: dune does find xdg required from src/lib/dune.

[emillon]

I think we need to take one step back: what steps, exactly, used to work with utop 2.12.1, and do not work with the version you're packaging? If it's the dune utop command, in which project are you running this command?

[SnarkBoojum]

I just tried to build a small example of the problem -- and I couldn't reproduce the Xdg issue. And it turns out that when there's a compilation problem, you just have to wait long enough for dune to decide it has reached 100% anyway.

Sorry for the noise.