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wegas
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Joined: 19 Jul 2014
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PostPosted: Sat Jul 19, 2014 8:34 pm    Post subject: Qt4 broken Reply with quote

Hello Forums,
I'm having trouble lately with Qt4.

Since I wanted to use QtCreator 5 I thought it a good idea to use the online installer. QtCreator could run fine, but sometimes crashed and it seemed to me that QtCreator actually used Qt4 and Qt5 in a mix. Later I wanted remove QtCreator 5 altogether with the bundled libs, which seems to not have worked.

From then on every program that uses Qt4 threw a floating point exception and I get the following error messages from gdb:
Code:

$ gdb /usr/bin/qtconfig
[...]
0x00007ffff75ef2e8 in QFontEngineFT::averageCharWidth() const ()
   from /usr/lib64/qt4/libQtGui.so.4

Code:

$ gdb /usr/bin/vlc
[...]
0x00007fffed7192e8 in QFontEngineFT::averageCharWidth() const () from /usr/lib64/qt4/libQtGui.so.4


I have already reemerged qtcore and vlc, as well as doing a world-update, preserved rebuild, as well as a revdep-rebuild. The Qt5 online (de-)installer won't start, because it needs a working Qt environment to draw its windows. Reading the strace files didn't get me any further but I uploaded them nonetheless: qtcreator, vlc.

Hopefully someone has another idea.
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The Doctor
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Joined: 27 Jul 2010
Posts: 2546

PostPosted: Sat Jul 19, 2014 8:47 pm    Post subject: Reply with quote

Welcome to the forums.

In the future, you may want to do an overlay search before manually installing software. Manual installations are practically guaranteed to mess up your system. I believe qt5 is in the qt overlay.

A targeted rebuild of all your qt packages should do the trick. You can use qlist to get a list like so emerge -1 $(qlist -IC dev-qt/*)

If that doesn't work you may as well recompile the entire dependency tree. emerge -1ev qt-creator should do the trick, but it will also get a bunch of other packages unfortunately.
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Apologies if I take a while to respond. I'm currently working on the dematerialization circuit for my blue box.
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wegas
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PostPosted: Mon Jul 21, 2014 3:06 pm    Post subject: Reply with quote

Took my old machine quite some time for those ~300 packages.

Unfortunately that didn't work out, everything is still giving the same error as before. Thanks for the tips though, The Doctor.

I think it may have to do something with Infinality being installed on my system and it the only thing I currently can imagine having to do with fonts within Qt. The strange thing is that GTK works fine, even when I play around with fontconfig.

If some other idea comes up, I'd be happy to know.
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wegas
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PostPosted: Wed Jul 23, 2014 7:39 am    Post subject: Reply with quote

Unfortunately disabling and removing infinality did not help.

Does anyone else have an idea on how to progress?
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