On Tue, 13 Mar 2018 22:15:35 +0300
Jone <yeger9@gmail.com> wrote:

> I wrote a simple script:
> 
> 	TRGT="*-gtk+-2.2*"
> 	for i in $(ls -d /gnu/store/$TRGT/)
> 	do
> 		echo
> 		echo "----------> $i"
> 		echo "$(guix gc --referrers $i | grep -v \.drv)"
> 	done
> 
> Part of output:
> ----------> /gnu/store/595ydgdnkj9vdxr88dkscb0ws9rgjv0g-gtk+-2.24.31/  
> /gnu/store/595ydgdnkj9vdxr88dkscb0ws9rgjv0g-gtk+-2.24.31
> /gnu/store/6h7w5z60zqx6802qxd98wcmx1yrhnzy5-xfce4-appfinder-4.12.0
> /gnu/store/8vy4gnmb17xc3hiqjd1b5z28vfsn8jzq-gtk-im-modules
> /gnu/store/fi77qxlq9ga6rgl9gg1xfxkfw7vps2l3-gtk-im-modules
> /gnu/store/ggrwghpwyfwrmxb90aj846c3ydwprqvl-gtk-im-modules
> /gnu/store/miiv6rnlrhbjk34l1ga7v6ys1x6983q4-libxfce4ui-4.12.0
> /gnu/store/rki1c8z0v7crppym7qzqys894pikxljc-garcon-0.4.0

[..]

> ----------> /gnu/store/rbzlcg13vpabvj2sr6c67icd15wq0vhz-gtk+-2.24.31/  
> /gnu/store/16rwx833av4k48hk2diqj87mwsc457j3-gtk-im-modules
> /gnu/store/rbzlcg13vpabvj2sr6c67icd15wq0vhz-gtk+-2.24.31
> 
> 
> It is possible to draw a conclusion, that each application refers the
> SEPARATE version of library. What??? Somebody can explain it?

I also have a lot of those in my store, although I rarely do a guix gc.

Suppose you don't change anything on a packages definition, i.e.
leave name, version, depencencies, build-system etc. completely as they
were. If you then change anything on the dependencies of that package
(or its sub-dependencies) it will get rebuild (or re-downloaded) with
the same package-name and package-version but under a different
hash-sum.

That's the reason why there is the branch of "core-updates" packages
(see point 7 in [1]): Basicly every package in the distribution depends
on a core-updates package. If you change one of the core-updates, the
whole distribution needs to be rebuilt. Because this would cause much
compilation-work on users computers, core-updates will be collected and
compiled by Hydra on a separate branch. If everything is compiled and
under a certain level of errors, it will be merged back into master and
will be available via guix pull.

In your case it could be that you have installed the different library
instances via different guix pulls.

Björn

[1]
https://www.gnu.org/software/guix/manual/guix.html#Submitting-Patches