From: Mark H Weaver <mhw@netris.org>
To: Alex Vong <alexvong1995@gmail.com>
Cc: guile-user@gnu.org, bootstrappable@freelists.org
Subject: Re: Can Guile be bootstrapped from source without psyntax-pp.scm?
Date: Fri, 07 Jul 2017 12:40:46 -0400 [thread overview]
Message-ID: <87d19cfbe9.fsf@netris.org> (raw)
In-Reply-To: <87podc1h53.fsf@gmail.com> (Alex Vong's message of "Fri, 07 Jul 2017 22:00:24 +0800")
Alex Vong <alexvong1995@gmail.com> writes:
> Mark H Weaver <mhw@netris.org> writes:
>
>> At this point, I believe it would be quite feasible for a single hacker
>> to audit our psyntax-pp.scm and compare it to psyntax.scm within a
>> reasonable time frame. Furthermore, when we make local changes to
>> psyntax.scm, the corresponding changes to psyntax-pp.scm are localized
>> and quite easy to audit as well, so the full audit need not be repeated.
>>
> It is really good that small change in source --> small change in
> binary. A fancy way of saying it: the map between source and binary is
> in some sense "continuious".
Sorry, I should have qualified my statement above with the word
"usually". There are some kinds of local changes that result in
non-local changes to psyntax-pp.scm, e.g. if one of the macros are
changed.
A particularly pessimal case is when the 'syntax-object' structure is
changed, since its accessors are macros that are used throughout the
code. This case actually happened recently in these commits:
https://git.savannah.gnu.org/cgit/guile.git/commit/?h=stable-2.2&id=eb84c2f2da83cf04214bbacf4b33528ce09a5b1a
https://git.savannah.gnu.org/cgit/guile.git/commit/?h=stable-2.2&id=a42bfae65f445178d3608433356ce132d1e7369e
As far as I'm aware, this is the first time such a large non-local
change has occurred since my work to minimize psyntax-pp.scm in 2012.
Mark
next prev parent reply other threads:[~2017-07-07 16:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-06 15:24 Can Guile be bootstrapped from source without psyntax-pp.scm? Alex Vong
2017-07-07 1:42 ` Mark H Weaver
2017-07-07 14:00 ` Alex Vong
2017-07-07 16:40 ` Mark H Weaver [this message]
2017-07-07 14:55 ` Jan Nieuwenhuizen
-- strict thread matches above, loose matches on Subject: below --
2021-03-13 22:42 Michael Schierl
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