Ludovic Courtès <ludovic.courtes@inria.fr> skribis:

> $ guix describe
> Generacio 162	Oct 01 2020 00:23:38	(nuna)
>   guix 7607ace
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     branch: master
>     commit: 7607ace5091aea0157ba5c8a508129cc5fc4f931
> $ guix build inkscape --no-grafts -d
> /gnu/store/arjs5hb4wmy6dh5d3y8bbs808ki9abf8-inkscape-1.0.1.drv
> $ guix build inkscape --no-grafts -d --with-graft=glib=glib-networking
> /gnu/store/zd8mm3w6x9c97anfaly77fz28s5y3i5h-inkscape-1.0.1.drv
> $ guix build inkscape --no-grafts -d --with-graft=libreoffice=abiword
> /gnu/store/arjs5hb4wmy6dh5d3y8bbs808ki9abf8-inkscape-1.0.1.drv
>
> The last one is fine: it has no effect.
>
> The second one is problematic: since we’re using ‘--no-grafts’, the
> ‘--with-graft’ option should have absolutely no effect; yet, it yields a
> different derivation.
>
> On closer inspection, we see that the core issue is that
> ‘gobject-introspection’ in the second case ends up with ‘libffi’ twice
> in its ‘*-guile-builder’ script, a problem similar to
> <https://issues.guix.gnu.org/38100>.  (‘libffi’ is propagated by both
> ‘glib’ and ‘gobject-introspection’.)

Here are test cases for this: