wip-full-source-bootstrap: from a 357-byte `hex0' to 'hello'

[Jan Nieuwenhuizen]

Hi!

I have reset Guix' wip-full-source-bootstrap branch with a first working
implementation of the, well, "Full Source Bootstrap" for x86-linux (and
x86_64-linux).  This bootstrap is rooted in the 357-byte hex0-seed from
the Stage0 project (https://savannah.gnu.org/projects/stage0):

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build hello --verbosity=1
[..]
/gnu/store/w61gf93yn2bxwyc6d1xp4y9lavvw1l3d-hello-2.10
17:58:54 janneke@dundal:~/src/guix/wip-fsb [env]
--8<---------------cut here---------------end--------------->8---

(it runs too!).

When you look at the bottom of the graph (see attached), you will notice
"%bootstrap-guile": the driver that we use for the Guix build and also
for "bootar", "gash", and "gash-utils".  This "%bootstrap-guile" is not
used as a seed in anything that is built, "%bootstrap-guile", "bootar",
"gash", and "gash-utils" could be replaced with any other driver.

Two new packages are added: "bootstrap-seeds", which contains the
hex0-seed binary
(https://github.com/oriansj/bootstrap-seeds/blob/master/POSIX/x86/hex0-seed)
with ASCII-equivalent
(https://github.com/oriansj/bootstrap-seeds/blob/master/POSIX/x86/hex0_x86.hex0),
and "m2-planet-boot" which, starting from hex0, via hex1, M0, hex2 and
M1, bootstraps the M2-Planet transpiler.  M2 is a language that closely
resembles a subset of C.

The breakthrough is that this M2-Planet can now compile a version of GNU
Mes, as yet unreleased: the wip-m2 branch.  This removes the remaining
binary seeds: %bootstrap-mescc-tools and %bootstrap-mes, together with
the "%bootstrap-mes-rewired" hack.

Apart from a review there is still some work before it can be
integrated, in short (from the top commit message):

XXX TODO:
   * wip-full-source-bootstrap
     - release mes-0.24, update
     - possibly release m2-planet-1.8.0, update
     - rebase wip-full-source-bootstrap onto core-updates
     - integrate
   * wip-arm-bootstrap
     - finish; currently stuck on gawk-mesboot0
     - release mes-0.23
     - devise strategy for integrating wip-full-source-bootstrap and
       wip-arm-bootstrap

Greetings,
Janneke

*) https://git.savannah.gnu.org/cgit/guix.git/log/?h=wip-full-source-bootstrap

gcc-core-mesboot0-graph.dot
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-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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