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Re: [Chicken-users] segfault using cairo/SDL

From: Christian Kellermann
Subject: Re: [Chicken-users] segfault using cairo/SDL
Date: Thu, 22 Dec 2011 09:41:05 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

* Markus Klotzbuecher <address@hidden> [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
> , 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

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

Thanks for your help!


Who can (make) the muddy water (clear)? Let it be still, and it will
gradually become clear. Who can secure the condition of rest? Let
movement go on, and the condition of rest will gradually arise.
 -- Lao Tse. 

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