bug#26366: Building Guix from within a container

[Clément Lassieur]

Hi,

I had a lot of trouble building Guix recently (is it related with Guile
2.2?).  Or it did build but then 'guix' command produced things like:

;;; WARNING: loading compiled file /home/clement/.config/guix/latest/guix/ui.go 
failed:
;;; ERROR: In procedure make_objcode_from_file: bad header on object file: 
"\x7fELF\x02\x01\x01�\x00\x00\x00\x00\x00\x00\x00\x00"
;;; note: source file /home/clement/.config/guix/latest/guix/ui.scm
;;;       newer than compiled 
/gnu/store/my64yq4r2ii0bblvsbfnjq5bnkivvn07-guix-0.12.0-5.1162/share/guile/site/2.0/guix/ui.go
;;; WARNING: loading compiled file 
/home/clement/.config/guix/latest/guix/utils.go failed:
;;; ERROR: In procedure make_objcode_from_file: bad header on object file: 
"\x7fELF\x02\x01\x01�\x00\x00\x00\x00\x00\x00\x00\x00"
;;; note: source file /home/clement/.config/guix/latest/guix/utils.scm
;;;       newer than compiled 
/gnu/store/my64yq4r2ii0bblvsbfnjq5bnkivvn07-guix-0.12.0-5.1162/share/guile/site/2.0/guix/utils.go
;;; WARNING: loading compiled file 
/home/clement/.config/guix/latest/guix/config.go failed:
;;; ERROR: In procedure make_objcode_from_file: bad header on object file: 
"\x7fELF\x02\x01\x01�\x00\x00\x00\x00\x00\x00\x00\x00"
;;; note: source file /home/clement/.config/guix/latest/guix/config.scm
;;;       newer than compiled 
/gnu/store/my64yq4r2ii0bblvsbfnjq5bnkivvn07-guix-0.12.0-5.1162/share/guile/site/2.0/guix/config.go

I finally got it to work by using 'guix environment -C -N guix'.  Is it
the right way to build Guix?  If so, here is a patch that updates the
documentation.