On Sunday, May 08, 2016 10:10:42 PM Andrew Deryabin wrote:
> Hi guys,
> Looking at lots of messages about lv2+gtk gui crashes I also installed
> latest ubuntu and can confirm that muse 3 crashes while opening calf guis.
>
> But it seems, that it's not related only to muse 3. Actual crash is not
> in calf library and not in muse's executables, but in library called
> libQt5XcbQpa.so, function QXcbWindow::setParent(...).
>
> This is a known bug of Qt 5.5.1.
> Here is the link (one of them): https://bugs.kde.org/show_bug.cgi?id=356583
>
> Or you can just type 'libqt5xcbqpa setParent segfault' in google :).
>
> Latest ubuntu uses this broken qt 5 version, so this will be a permanent
> bug, until qt5 is not updated. By the way - this bug is fixed already in
> latest qt5 versions.
Howdy list, hi Andrew. I'm speakin' at ya' from this brand new...
OpenSUSE Leap 42.1 installation !
Guess what? Everything's fine here. MusE and QTractor-Qt5.
SUSE is one of those distros where they patch to the hilt.
I used it for several years before Ubuntu. I bought boxed versions.
Mandrake/Mandriva (now Mageia) as well.
Whereas, I read, KUbuntu stays relatively faithful to the original code.
KUbuntu uses Qt5 5.5.1-10.The fixes are applied in Qt5 5.5.1-11.
Looking at the SUSE versions and change log for QT5,
it is version 5.5.1-10-1. It is a /patched/ version.
The change log indicates there is /more/ than one fix for this
'setParent' problem, spread over some time.
This seems to makes sense, since the bug report link pointed to (above)
only seemed to fix broken dialogs and apparently that fix made it into Qt
just in time - the dialogs work fine in KUbuntu 16.04.
But apparently there were still problems left over that weren't solved
by release time, as we see with this 'setParent' LV2 Gtk UI crash.
Apparently the Qt camp was having trouble with 'screens'.
Ah well, KDE5 and Qt's QWindow are all brand new stuff.
Give it time I suppose.
> Muse 2.2.1 is on qt4, so it just works.
>
> P.S. QTractor in ubuntu 16.04 is also built against Qt 4, so tests of
> muse3 vs qtractor have nothing to do.
True, but QTractor Qt5 built on Ubuntu 16.04 crashes in the very same spot.
-----
[* SUSE MusE Bug alert *]
Andrew, there is a bug on SUSE where our lv2GtkHelper library
fails to compile with several errors like this:
lv2Gtk2Helper.cpp:20:54: error: ISO C++ forbids casting between pointer-to-
function and pointer-to-object [-Werror=pedantic]
sz_cb_fn fn = reinterpret_cast<sz_cb_fn>(user_data);
(I recently split the makefile into 32 and 64 bit, and made it easier to
recompile your own versions - placing the results into their own build dir
while not touching the shipped versions.)
The 'pedantic' thing and the 'casting' thing are pretty touchy subjects,
I read about that error today. Some solutions are out there.
* I was going to try to fix it but I though i would ask you if you'd
like to try since you know the code. Or... suggestions that you
want me to try?
Also I want to try to move that helper library code into the cmake project
and ask the user if they'd like to build it themselves (requiring Gtk stuff).
Actually, I was thinking rather of not shipping a pre-built version at all
and /requiring/ Gtk developer packages in order to support LV2 Gtk Uis.
It's Gtk dependencies are simple enough that I think we can get away with it.
Thanks.
Tim.
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