bootstrapping SED-4.5, circular dependency?

[Jan Nieuwenhuizen <janneke@gnu.org>]

Hi!

Now that we have successfully bootstrapped GuixSD without using Gcc,
Binutils, GNU C lib, I am working to remove other binary bootstrap
seeds; such as SED and GZIP.

I have bootstrapped GNU make and Bash and was looking into building
GZIP, only to find out that it depends on a SED feature that our
bootstrap-gash does not provide.

So, I figured that SED should be built before GZIP, but I found that
SED-4.5 depends on the same SED feature that GZIP needs...apparently
a circular dependency?

Here is what I get:
--8<---------------cut here---------------start------------->8---
configure flags: ("CONFIG_SHELL=/gnu/store/md6pc5frcqnmndgwmnwk3xkmh4bx71jc-bash-mesboot-4.4.23/bin/bash" "SHELL=/gnu/store/md6pc5frcqnmndgwmnwk3xkmh4bx71jc-bash-mesboot-4.4.23/bin/bash" "--prefix=/gnu/store/hy9dq7jhmnjsgbaq9rkg59h9ssgqqzhw-sed-mesboot-4.5" "--enable-fast-install" "--build=x86_64-unknown-linux-gnu")
Backtrace:
           5 (apply-smob/1 #<catch-closure 9e5260>)
In ice-9/boot-9.scm:
    705:2  4 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
    619:8  3 (_ #(#(#<directory (guile-user) a670a0>)))
In gash/commands/sed.scm:
   132:30  2 (sed . _)
In ice-9/boot-9.scm:
   222:17  1 (map1 ("/^.*\\/\\([^/][^/]*\\)\\/*$/{\n\t    s//\\1/\n?"))
In unknown file:
           0 (scm-error misc-error #f "~A" ("SED: command not supp?") ?)

ERROR: In procedure scm-error:
SED: command not supported: "/^.*\\/\\([^/][^/]*\\)\\/*$/{\n\t    s//\\1/\n\t    q\n\t  }\n\t  /^X\\/\\(\\/\\/\\)$/{\n\t    s//\\1/\n\t    q\n\t  }\n\t  /^X\\/\\(\\/\\).*/{\n\t    s//\\1/\n\t    q\n\t  }\n\t  s/.*/./; q"
--8<---------------cut here---------------end--------------->8---

The SED throwing this error is the minimal SED from Gash, that I
implemented in GNU Guile.

Do you know whether bootstrapping of GZIP and/or SED is supported?  Can
you advise me on my next step (looking to bootstrap an earlier SED --
which version? or an earlier GZIP -- which version?)

Thanks!
janneke

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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