GNU bug report logs - #46806
[PATCH] gnu: ocaml-4.07: Bootstrap.

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From: Julien Lepiller <julien <at> lepiller.eu>
To: pukkamustard <pukkamustard <at> posteo.net>
Cc: 46806 <at> debbugs.gnu.org
Subject: [bug#46806] [PATCH] gnu: ocaml-4.07: Bootstrap.
Date: Mon, 01 Mar 2021 06:44:32 -0500

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Thanks! OK to push?

Le 1 mars 2021 04:16:14 GMT-05:00, pukkamustard <pukkamustard <at> posteo.net> a écrit :
>
>I managed to build camlboot and ocaml <at> 4.07 with your patches.
>
>> Would be fantastic if you could report build time for camlboot 
>> too :).
>
>Build time (on a quad-core i7 laptop):
>
>```
>$ time ./pre-inst-env guix build camlboot --no-offload
>.
>.
>.
>successfully built 
>/gnu/store/ddi5n28hsrgvb89r8vjs0rfvapxfbaj2-camlboot-0.0.0-0.506280c.drv
>/gnu/store/79bqayhrc6qfr2k7pfk7fn6lim0f8cfx-camlboot-0.0.0-0.506280c
>
>real	322m35.119s
>user	0m1.523s
>sys	0m0.140s
>```
>
>ocaml <at> 4.07 with your patches applied:
>
>```
>$ time ./pre-inst-env guix build ocaml <at> 4.07 --no-offload
>successfully built 
>/gnu/store/sdxybpxzjhib5ijn3fx3r29ycp5vvafd-ocaml-4.07.1.drv
>/gnu/store/cniid9xi3dck7kdpfm77h56h1s0701fm-ocaml-4.07.1
>
>real	17m52.923s
>user	0m9.268s
>sys	0m1.013s
>```
>
>ocaml <at> 4.07 at master:
>
>```
>$ time ./pre-inst-env guix build ocaml <at> 4.07 --no-offload --check
>successfully built 
>/gnu/store/v599h0bhpyh2rq4nrnqqf56lwbsf0f71-ocaml-4.07.1.drv
>successfully built 
>/gnu/store/v599h0bhpyh2rq4nrnqqf56lwbsf0f71-ocaml-4.07.1.drv
>/gnu/store/s7j0vl88zakkdcyvw1jw8cypfzi6ljnd-ocaml-4.07.1
>
>real	21m44.000s
>user	0m14.546s
>sys	0m1.217s
>```
>
>> The result should be almost identical to our current ocaml-4.07, 
>> though there are some due to different output directory being 
>> embedded.
>
>Checked some random files in both ocaml's with diffoscope and can 
>confirm that differences seem to be mostly different output 
>directories.
>
>Haven't run diffoscope on everything as that would take quite some 
>time...
>
>-pukkamustard
>
>
>>>
>>>Fantastic! Thank you and thanks to the camlboot project! I will
>>>try and
>>>build this tonight.
>>>
>>>Julien Lepiller <julien <at> lepiller.eu> writes:
>>>
>>>> Hi Guix!
>>>>
>>>> This small series adds camlboot, a project to reimplement a
>>>> bootstrap
>>>> for OCaml, which lets us remove the pre-built 
>>>> boot/ocaml{c,lex}
>>>> :)
>>>>
>>>> The first patch builds the bootstraped ocamlc and ocamllex. 
>>>> This
>>>> takes
>>>> around 4 hours to build. The second patch rebuilds them using
>>>> the source
>>>> code for ocaml 4.07.1, instead of the modified sources used in
>>>> camlboot, and reuse them to run the main Makefile (make
>>>> world.opt).
>>>>
>>>> As a result, we have identical files for this bootstrap and 
>>>> the
>>>> unbootstrapped OCaml (up to output store paths and hash of 
>>>> some
>>>> files
>>>> that get embedded in native files, which differ because of the
>>>> different output path).

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