bug#41177: Fontconfig issues in Java applications that use fonts

[Ludovic Courtès]

Hi,

Fabien SK <fabsk@free.fr> skribis:

> Regarding Java, I think (but I'm not sure) that it's loaded by
> "libawt_xawt.so". In fontpath.c [1], there is a dlopen of
> libfontconfig. But if I do a "ldd" on the shared library itself, it
> looks like it does not depend on libfontconfig.so.
> [1]
> https://github.com/openjdk/jdk16/blob/37043b05576c8b81b43ac41a8f06de0d0bbb3f5b/src/java.desktop/unix/native/common/awt/fontpath.c#L566
> Also libfontconfig is not on its RUNPATH:

Indeed, all the ‘openjdk’ packages have fontconfig has an input, but
‘guix size openjdk | grep fontconfig’ shows it’s not there, meaning that
nothing actually linked against fontconfig.

Perhaps we should patch this ‘fontpath.c’, with ‘substitute*’, so that
it refers to libfontconfig.so by its absolute file name?

Thanks,
Ludo’.