Re: [PATCH 2/6] build-system/emacs: Use "emacs" from native-inputs if specified.

[Alex Kost <alezost@gmail.com>]

Ludovic Courtès (2016-05-19 14:54 +0300) wrote:

> Alex Kost <alezost@gmail.com> skribis:
>
>> * guix/build-system/emacs.scm (lower): Do not add "emacs" to
>>   build-inputs if it is already specified in the native-inputs.
>
> In theory, one could want to have Emacs both in ‘native-inputs’ (to
> build .elc files, for instance) and in ‘inputs’ (for instance because
> the program embeds a reference to the ‘emacs’ program.)

I don't see a problem here, if "emacs" should be added to inputs, it may
just go there.  Nothing prohibits it.

> So I’m rather reluctant about this approach.
>
> Did you find packages where Emacs wrongfully appears twice in the
> inputs?  It might be best to fix those packages instead.

Do you mean: appears both in "inputs" and "native-inputs"?  If so, then
no, there are no such packages.

But I don't understand how this concerns.  The purpose of this patch is
to allow us to use a different "emacs" to build emacs packages.  I
would say this is the core patch of the whole patchset.  I didn't like
the fact that emacs-build-system uses a full-featured (and heavy on
dependencies) "emacs" package, and I would like to use "emacs-minimal"
instead.  But for some rare cases (currently only for auctex),
"emacs-minimal" (or "emacs-no-x") is not enough, so it should be
substituted somehow.  That's why I made this patch.

-- 
Alex