Project Center segfault and nil objects

[Duncan Anker]

When I initially installed GNUstep, Project Center was working fine. 
More recently (and after several upgrades of everything) It would 
segfault every time the mouse was moved over a button.

After some investigation I discovered the crash was occurring within 
objc_msg_lookup, although I couldn't see why. I added a  guard clause in 
[PCButton mouseMoved] to return immediately if ttWindow was nil, as that 
was the receiver that was crashing. It now seems to work again.

I was of the belief that it is legal to send messages to nil in 
Objective C, and nothing would happen. This is supposed to be one of the 
benefits of it after all, not having to check every object before 
sending a message. Given that assumption is true then, is it possible 
that nil has a different value between the Project Center support 
libraries and the Objective C runtime?

Everything is built with the same compiler (gcc 4.0.1 although I had the 
same problems with 3.3).

--
Duncan Anker
Server 101, Web Hosting & E-Commerce
http://www.server101.com

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