[Ipe-discuss] IPE 7 crashing constantly on MacOS X :-(

Otfried Cheong otfried at ipe.airpost.net
Sat May 14 16:33:20 CEST 2011

elwood151 wrote:
> I've submitted the logs for the last 25 crashes...
> https://sourceforge.net/apps/mantisbt/ipe7/view.php?id=41

Is there any reason you created a new bug instead of adding to bug #20? 
  Do you  believe this is a different issue?

Just for clarity, Mac OS is not a supported platform for Ipe - I do not 
have a Mac, are unwilling to learn Apple's idiosyncracies, and have no 
way to help fix a problem that only appears on Macs.  I have done quite 
a bit of testing with valgrind to see if there are memory allocation 
errors in Ipe.

I have not had Ipe crashing on me for years now on the Linux platform 
(which is the only one I actually use).

My suspicion is that this is once again a Qt bug.  Qt has become so 
large and is developed at such a fast rate that it seems somewhat 
brittle to me.  Can anyone recommend an alternative lighter GUI library 
that works for Unix, Apple, and Windows?

Olivier's observation that this might be a reentrance problem is 
interesting.  Nearly all Ipe actions are executed through MODEL:action 
in actions.lua - one could set a flag here when one enters the action, 
reset it when leaving, and see if the code is ever called while the flag 
is set.  (I don't see how this could happen, though.)

To summarize: I am not working on this problem, and posting new bug 
reports is useless until a Mac user actually sits down and debugs the 
problem.  But perhaps it will just go away with a new version of Qt 
sometime (like some previous 'Ipe bugs').


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