[Therion] Loch fails on Fedora 30

[Bill Gee]

Good idea!  But no joy ...  No Wayland here - I am still on X.  

$ echo $XDG_SESSION_TYPE 
x11 

Just in case - I tried your command to force x11 and got exactly the same error.

-- 
Bill Gee



On Wednesday, July 17, 2019 3:57:32 PM CDT Olly Betts wrote:
> On Wed, Jul 17, 2019 at 09:22:55PM +0100, James Begley wrote:
> > The build of Loch from the copr repository works for me on my fedora 30
> > workstation, so I'm guessing that there is an incompatibility with some
> > libraries on your laptop and desktop. You say that Loch "no longer works",
> > so presumably it used to work? Do you know vaguely when it stopped working?
> > Note that the build of Loch in the copr repository hasn't changed since the
> > therion 5.4.4 build on the 1st of May, so if Loch was working after that
> > date, and isnt working now then it would point to an external library
> > problem.
> > 
> > Your error message points to a problem within the lxR2P.c file (
> > https://github.com/therion/therion/blob/master/loch/lxR2P.c) which would
> > suggest that the mesa-libGL package might be causing this issue. I've got
> > version 19.0.8-1 installed here, which was built on the 26th June (see
> > https://koji.fedoraproject.org/koji/packageinfo?packageID=184), but the
> > Loch copr package would have been originally built against 19.0.3-1 . Does
> > that help? (The mesa changelogs from https://www.mesa3d.org/ don't help me
> > very much!).
> 
> Currently wxWidgets' OpenGL support requires X and doesn't work with
> Wayland.
> 
> Fedora now defaults to Wayland, so perhaps Bill is using that default
> but James is still using X?
> 
> You can override for a single application by running it from a terminal
> like so:
> 
> GDK_BACKEND=x11 loch
> 
> In Survex this workaround is implemented in the aven code, but I don't
> see anything equivalent in the therion code.
> 
> Cheers,
>     Olly
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