[bug#73157] [PATCH] gnu: mscgen: Fix dependencies.

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Sébastien,

Sébastien Lerique <sl@eauchat.org> writes:

> Hi! And thanks.
>
>> I've built this locally, and checked if references were retained to the
>> added inputs; it seems ijg-libjpeg is not retained as a reference, which
>> means it is unused at run time and could be left out (or perhaps it
>> tries to dynamically load it, in which case the dlopen calls could be
>> patched, but I doubt so).
>>
>> --8<---------------cut here---------------start------------->8---
>> $ guix gc -R /gnu/store/jbdbq8kxy5956wkqg4qrvfdks776gfb1-mscgen-0.20 |
>> grep ijg-libjpeg
>> -> no output
>> --8<---------------cut here---------------end--------------->8---
>>
>> Could you verify the above, and if my assumption is correct, send a v2
>> without the added ijg-libjpeg?
>>
>
> So just removing ijg-libjpeg results in
>
>   Package 'libjpeg', required by 'gdlib', not found
>
> and replacing it with libjpeg-turbo works. "libjpeg" on its own is just
> not found (and not defined in the guix source I see
> 590904cca15922e6474fbd3a71af9b3a45b268af ).
>
> Should it be the turbo one?

It should be turbo to match the default libjpeg used in Guix; but rather
than being propagated from mscgen, it should probably be propagated from
gdlib, which seems to have it listed in its pkg-config files:

--8<---------------cut here---------------start------------->8---
$ find $(guix build gd) -name '*.pc' -execdir cat {} +
refix=/gnu/store/8rl0dz3982ms15j2j50myr89dkc3h5y5-gd-2.3.3
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: gd
Description: GD graphics library
Version: 2.3.3
Requires:
Requires.private:   zlib  libpng  freetype2 >= 9.8.3  fontconfig  libjpeg
Cflags: -I${includedir}
Libs.private:  
Libs: -L${libdir} -lgd
--8<---------------cut here---------------end--------------->8---

Anything listed in pkg-config 'Requires' or 'Requires.private' should be
propagated for the pkg-config machinery to work as expected.  This topic
is brushed in the manual (see info "(guix) package References"), where
'propagated-inputs' are documented.

-- 
Thanks,
Maxim