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Re: %module-public-interface

From: Ludovic Courtès
Subject: Re: %module-public-interface
Date: Fri, 02 Apr 2010 11:37:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Hi Ian,

Ian Hulin <address@hidden> writes:

> On 30/03/10 22:52, Ludovic � wrote:

>> Andy Wingo<address@hidden>  writes:
>>> On Tue 30 Mar 2010 22:56, address@hidden (Ludovic Courtès) writes:
>>>>> I'm pretty sure that the submodule thing can be changed without any
>>>>> problem. But it seems that the %module-public-interface is used
>>>>> explicitly, at least by texmacs and lilypond.
>>>> How do they use it?
>>> Linking to the evil empire:
>> Lilypond does:
>> --8<---------------cut here---------------start------------->8---
>>        mod = scm_call_0 (maker);
>>        scm_module_define (mod, ly_symbol2scm ("%module-public-interface"),
>>                           mod);
>> --8<---------------cut here---------------end--------------->8---
>> Solution: do something like:
>> --8<---------------cut here---------------start------------->8---
>>    scm_set_module_public_interface_x (mod, mod);
>> #else
>>    scm_module_define (mod, ly_symbol2scm ("%module-public-interface"),
>>                       mod);
>> #endif
>> --8<---------------cut here---------------end--------------->8---
>> (We just need to add that function.)
>> TeXmacs does:
> <snip>
>>>> And we could add a ‘public-interface’ slot to ‘module-type’ and have
>>>> ‘module-public-interface’ and ‘set-module-public-interface!’ refer to
>>>> it; for backward compatibility we’d also initialize the
>>>> ‘%module-public-interface’ binding.  How does it sound?
>> Actually the trick wouldn’t work in cases where the
>> ‘%module-public-interface’ binding is mutated, as with Lilypond.
>> Given this and the above examples, I’d suggest dropping that binding
>> completely and sending patches to the Lilypond/TeXmacs people.
>> What do you think?
> If you do add scm_set_module_public_interface_x, could you back-port
> it to Guile V1.8.6 and V1.8.7?

We could back-port it to the 1.8 series, but not to the already-released
1.8.7 and 1.8.6.  We’d have to make a 1.8.8 release, but I’m not sure
that would really help anyway since that would force Lilypond users to
switch to that version.

> Those are the lowest versions of Guile the upcoming stable release of
> Lilypond will support.

How about doing #ifdef HAVE_SCM_SET_MODULE_PUBLIC_INTERFACE_X in your

We still have to agree on the change and actually implement it, the
latter being easy. ;-)  When is the new Lilypond release due?


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