From: ludo@gnu.org (Ludovic Courtès)
To: Arun Isaac <arunisaac@systemreboot.net>
Cc: Ricardo Wurmus <rekado@elephly.net>,
Mark H Weaver <mhw@netris.org>,
29745@debbugs.gnu.org
Subject: [bug#29745] [PATCH 0/3] Disallow phase returning <unspecified>.
Date: Tue, 19 Dec 2017 09:38:05 +0100 [thread overview]
Message-ID: <871sjr9kpe.fsf@gnu.org> (raw)
In-Reply-To: <cu7tvwoe77j.fsf@systemreboot.net> (Arun Isaac's message of "Mon, 18 Dec 2017 14:36:08 +0530")
Hi,
Arun Isaac <arunisaac@systemreboot.net> skribis:
>> For instance we could change the return value of ‘substitute*’ to be
>> #t on success; similarly for ‘install-file’.
>
> Yes, changing the return value of these functions is a good idea,
> regardless of what we decide here in this thread.
OK, let’s do that in the next ‘core-updates’.
> But, there will always be phases that do not end with a call to these
> functions, and we won't be able to cover those cases. So, this is not
> a complete solution to the problem being discussed in this thread.
True.
>>> Wouldn't it be simpler and more logical to accept unspecified values
>>> as "true" in line with Scheme's notion of "true"?
>
> Also, during patch review, the reviewer has to go to the extra trouble
> of manually checking if all phases return #t. If either the build system
> strictly checks for #t, or if #t were not strictly required (meaning
> #<unspecified> was tolerated), we would save ourselves some tedious
> manual work.
I agree.
>> That’s a good question. My take on it is that it’s clearer: the return
>> value of ‘substitute*’ for instance is unspecified, it’s not necessarily
>> *the* unspecified value.
>
> My take is that we have two options:
>
> - disallow #<unspecified> and strictly check for #t in the build system
> even though this creates a new notion of "true"
> - allow #<unspecified> as "true" in line with the rest of Scheme, and
> stop appending #t at the end of phases
>
> I have no particular preference about which option we should
> choose. But, we do have to choose one of these options
> completely. Partial solutions might only add to the existing troubles.
I get your point.
I don’t have a strong preference either, to be honest. I think Mark
did, so I’m Cc’ing him. Mark?
Ludo’.
next prev parent reply other threads:[~2017-12-19 8:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-16 23:12 [bug#29745] [PATCH 0/3] Disallow phase returning <unspecified> Arun Isaac
2017-12-16 23:16 ` [bug#29745] [PATCH 1/3] build: gnu-build-system: " Arun Isaac
2017-12-16 23:16 ` [bug#29745] [PATCH 2/3] build: gnu-build-system: Return #t from phases Arun Isaac
2017-12-16 23:16 ` [bug#29745] [PATCH 3/3] gnu: " Arun Isaac
2017-12-17 6:27 ` [bug#29745] [PATCH 0/3] Disallow phase returning <unspecified> Ricardo Wurmus
2017-12-17 16:55 ` Ludovic Courtès
2017-12-17 17:47 ` Arun Isaac
2017-12-18 8:01 ` Ludovic Courtès
2017-12-18 8:44 ` Ricardo Wurmus
2017-12-28 11:43 ` bug#29745: " Arun Isaac
2017-12-18 9:06 ` [bug#29745] " Arun Isaac
2017-12-19 8:38 ` Ludovic Courtès [this message]
2017-12-19 21:58 ` Mark H Weaver
2017-12-18 9:26 ` Andreas Enge
2017-12-17 18:14 ` Marius Bakke
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