bug#60831: Are our graphs okay?

[Liliana Marie Prikler]

Hi Guix,

Continuing the discussion Ludo’ started over at guix-devel regarding
package size, note that we have

$ guix size emacs-minimal 
Store-Objekt                                                     Gesamt   Selbst
/gnu/store/lphzb1z0r4kbb453rsvnw7msrxxzp5r7-libgccjit-10.3.0       244.8   
128.5  27.2%
/gnu/store/wrzjr2g38f23fqg09rrdcn10va5gc5xl-emacs-minimal-28.2     472.4   
110.7  23.4%
/gnu/store/zyqimpkmpffc24nwwqp46cicj8ss85y5-binutils-2.37          126.0    
54.4  11.5%
/gnu/store/ayc9r7162rphy4zjw8ch01pmyh214h82-glibc-2.33              76.6    
36.6   7.8%
/gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33              38.3    
36.6   7.7%
/gnu/store/6d0pl5khj08j3c2619jnypc8bznspgx8-gcc-10.3.0-lib          71.7    
33.4   7.1%
/gnu/store/094bbaq6glba86h1d4cj16xhdi6fk2jl-gcc-10.3.0-lib          71.7    
33.4   7.1%
/gnu/store/8fpk2cja3f07xls48jfnpgrzrljpqivr-coreutils-8.32          91.6    
16.4   3.5%
/gnu/store/9rrnm5hdjw7cy96a2a9rfgh6y08wsbmf-ncurses-6.2.20210619    77.6     
5.9   1.3%
/gnu/store/pmq05n0q25v4qjyibxfrp53v4391k7vh-mpfr-4.1.0              78.4     
4.0   0.9%
/gnu/store/ajw8nnrnd6hr183skwqdgc8c7mazg97h-isl-0.23                77.3     
2.9   0.6%
/gnu/store/fwbiihd2sbhai63y1pvvdh0f2bakfzrf-gmp-6.2.1               74.4     
2.7   0.6%
/gnu/store/4f304c7dp68hkcp1zi1i07zm8nfvvyp7-bash-static-5.1.8        1.7     
1.7   0.4%
/gnu/store/720rj90bch716isd8z7lcwrnvz28ap4y-bash-static-5.1.8        1.7     
1.7   0.4%
/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8      39.3     
1.0   0.2%
/gnu/store/xjwp2hsd9256icjjybfrmznppjicywf6-grep-3.6                73.5     
0.8   0.2%
/gnu/store/ba02g5xkqiss6s5z8mbj9cvkal6l7b9g-mpc-1.2.1               78.8     
0.4   0.1%
/gnu/store/a38k2v29l6l0iz6pmlk4dmzwdbvl10lq-acl-2.3.1               72.3     
0.3   0.1%
/gnu/store/a7ggx0af69gv4k5mr1k617p4vy9kgx2v-libcap-2.62             72.0     
0.3   0.1%
/gnu/store/jkjs0inmzhj4vsvclbf08nmh0shm7lrf-attr-2.5.1              71.9     
0.2   0.1%
/gnu/store/8qv5kb2fgm4c3bf70zcg9l6hkf3qzpw9-zlib-1.2.11             71.9     
0.2   0.0%
/gnu/store/0c1yfbxyv877mlgychfgvmk5ha2jqh52-gzip-1.10               73.7     
0.2   0.0%
Gesamt: 472.4 MiB

but 

$ guix graph --path emacs-minimal libgccjit 
guix graph: Fehler: Kein Pfad von „emacs-minimal@28.2“ nach
„libgccjit@12.2.0“

and 

$ guix graph --path /gnu/store/wrzjr2g38f23fqg09rrdcn10va5gc5xl-emacs-
minimal-28.2 /gnu/store/lphzb1z0r4kbb453rsvnw7msrxxzp5r7-libgccjit-
10.3.0 --type=referrers
guix graph: Fehler: Kein Pfad von
„/gnu/store/wrzjr2g38f23fqg09rrdcn10va5gc5xl-emacs-minimal-28.2“ nach
„/gnu/store/lphzb1z0r4kbb453rsvnw7msrxxzp5r7-libgccjit-10.3.0“

This is rather curious.  How does libgccjit land in emacs-minimal's
closure?