Re: SIGSEGV from qwt3diodummy constructor

[Andreas H. <an...@xs...>]

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Hi Stefan!

Thanks for your response!

Stefan Blum schrieb:
| Hi Andreas,
|
| as any help is appreciated ...
|
| I am not too familiar with qwt_plot3d and have no experience with labplot,
| but the type of error looks to me like a typical mismatch of different Qt
| versions. Make sure that you have compiled  and linked every single piece
| with the _same_ Qt version (perhaps including KDE). And, it is worth
| noting that different linux platforms will use different Qt versions. You
| probaly will have to let the compiler run on each single installation. To
| see the library dependencies, use ldd + executable/shared object.
|
In my case the whole system was compiled by myself from
sources a few days ago, as we use our own Linux distribution
here. So I know for sure that KDE, LabPlot etc. was compiled
against the very same QT library (version 3.3.4).

During my tests I recompiled LabPlot, Qt and qwtplot3d
several times with different compile options, just to
get something what I would call "differential diagnosis":
slightly change some well defined parts of the system until
you get a different outcome. Then you know which part is
responsible for it. But in this case I _always_ got the same
result: it always crashes in the constructor of Qwt3d::IO on
access to the QString::null object.

If it was a library mismatch, I think I would have seen
at least some difference in behaviour during those many
compile runs...

- - andreas

- --
Andreas Haumer                     | mailto:an...@xs...
*x Software + Systeme              | http://www.xss.co.at/
Karmarschgasse 51/2/20             | Tel: +43-1-6060114-0
A-1100 Vienna, Austria             | Fax: +43-1-6060114-71
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