On Thu, Dec 22, 2011 at 10:57:39AM +0100, Markus Klotzbuecher wrote:
On Thu, Dec 22, 2011 at 09:41:05AM +0100, Christian Kellermann wrote:
* Markus Klotzbuecher m...@marumbi.de [111221 21:12]:
Dear All,
I'm trying to use the cairo and sdl eggs for a small visualization
tool. One thing I would like to do is to use the mouse to move around
the current figure by clicking and holding it. However, I am getting
frequent segfaults after a few seconds of this moving around. The
crash happens both when running compiled and interpreted. Below an
slightly modified version of the test-cairo.scm from the cairo egg
that implements this dragging (I would have pasted it to
http://paste.call-cc.org/ , but the service seems down)
Is anyone else using these eggs and has seen such problems? Does
anyone have a suggestions how to track this down?
Yes, I am currently using it for a small doodle framework for easy
visualisations and games. I haven't looked (yet) into mouse support.
The SDL egg is rather dusty and there might be such dark corners.
I will file this as a bug and will have a look at it during the
holidays.
Great, much appreciated!
If you find the time you could build a chicken with debugging
information (add DEBUGBUILD=1 to the make call) and show be the
backtrace of that. This might be of more help than the standard
backtrace.
Fine, i'll try to do that during the holidays!
The problem seems to be triggered by the use of text-extents. I
uploaded a newer testcase to the bug report that makes heavier use of
extents and also crashes almost immediately on my machine. I also
added a backtraces from a CHICKEN built with DEBUGBUILD=1.
Best regards
Markus
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