[Mesa-dev] [Bug 98428] Undefined non-weak-symbol in dri-drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98428

--- Comment #9 from Kyle Brenneman <kyle.brenneman at gmail.com> ---
> > >  - And last but not least - reuse GLVND dispatch. For this we would need to
> > > convince Kyle that GLdisplatch.so can be accessible by vendors and it gets
> > > some ABI stability (note the GLVND libraries in general seem ABI unstable).
> > 
> > We're likely to want libGLdispatch to be stable API anyway, yes. Consider
> > this bit of discussion:
> > 
> > https://github.com/NVIDIA/libglvnd/pull/100#issuecomment-254588402
> 
> I've mentioned a similar thing [1] [2] and it seems that one "has to" go
> through the winsys library/ies [2].
> 
> Even convincing to version GLdispatch.so ended up quite a process [3].
> 
> My personal favourite: "To clarify: libGLdispatch.so does not have an ABI." 
> Sure it doesn't ... ;-)
> 
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=92877#c2
> [2] https://github.com/NVIDIA/libglvnd/pull/85
> [3] https://github.com/NVIDIA/libglvnd/issues/59.

libGLdispatch.so doesn't have an ABI because it has no direct interface *at
all* to applications or drivers. The entire interface is defined in libGLX.so
and libEGL.so, including anything that passes through to libGLdispatch.so.

Now, providing more direct control over the dispatch tables is something that's
come up before. This is the current version of that:
https://github.com/NVIDIA/libglvnd/pull/89

I don't have a good enough understanding of what Mesa needs out of it to be
sure if that's sufficient, but if that overall design looks like it would work,
then I'd be happy to dust it off and get it updated for the current EGL and GLX
interfaces.

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