Re: [Buildroot] GLib/GObject-introspection bootstrap

From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Fiona Klute <fiona.klute@gmx.de>
Cc: Fabrice Fontaine <fontaine.fabrice@gmail.com>,
	iMarcus Hoffmann <buildroot@bubu1.eu>,
	buildroot@buildroot.org
Subject: Re: [Buildroot] GLib/GObject-introspection bootstrap
Date: Mon, 19 Aug 2024 22:30:46 +0200	[thread overview]
Message-ID: <ZsOrdr_Wyujsgqh7@landeda> (raw)
In-Reply-To: <44f9f8a3-9ebf-4cad-acd8-1b6331581c72@gmx.de>

Fiona, All,

+Marcus

On 2024-08-19 19:52 +0200, Fiona Klute via buildroot spake thusly:
> I'm currently trying to upgrade GLib & GObject-introspection to their
> current versions (1.80.4 and 1.80.1), not least because those work with
> musl without patching.

Not a small task you started there...

There was was some previous talks about that on IRC, but I haven't seen
anything materialising so far... Marcus, are you still looking into
that?

So, for the records, here's my suggestion below...

> The difficulty is that GLib now needs a sort of
> bootstrap process:
> 
> * Build GLib with -Dintrospection=disabled
> * Build GObject-introspection
> * Build GLib with -Dintrospection=enabled
> 
> Description in the GLib NEWS file:
> https://gitlab.gnome.org/GNOME/glib/-/blob/17d1bf3c4962d942feea0830aeee6833104fef5d/NEWS#L429-438
> 
> What would be the preferred way to implement this in Buildroot? Is there
> a built-in way to rebuild a package with different config after building
> another package for such situations? Or should I include that bootstrap
> build of GObject-introspection in libglib2.mk (like Alpine does)? In the
> latter case the GLib package would share the source archive with
> GObject-introspection and I remember reading on the ML that there's
> support for that, would be great if someone could point me at it if
> relevant.

So, the way to go would be to introduce a new package,
libglib2-bootstrap, where the no-introspection libglib2 is built.

Then GObject-introspectionGObject-GObject-introspection depends on
libglib2-bootstrap.

To share download, you'd tell libglib2-bootstrap to share its download
with libglib2:
    LIBGLIB2_BOOTSTRAP_DL_SUBDIR = libglib2

Note that there is also the case for host-libglib2: do we need an
introspection-aware host-libglib2, or can we do without it? If the
former, then we'll need libglib2-bootstrap to also be a host package.

> Also, when I prepare patches, should I just drop the glibc requirement
> for GObject-introspection, or add musl? I have no idea if it works with
> uClibc.

Just add musl.

> Likewise, are the checks for (ancient) GCC versions still relevant?

Not sure what you meant here: libglib2 has no dependency on a gcc
version. gobject-introspection does, however, and I doubt they would no
longer be releveant; they may even be more stringent. Ypou'd have to
check what libglib2 anf goi state they require.

Regards,
Yann E. MORIN.

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