I have a program in lazarus with a thread .
When there is a SegF in this thread it exits without notifying GDB. So the error is silent even with GDB (Windows/Linux/OSX) I have to wrap it like this :

try
   ..
except
   RaiseGDBException(...)
end;

May I miss something like an option to enable, since the error is caught by the try..except statement ?

I don't know about gdb, but I know that you have to be extremely careful with exceptions in a thread, since any uncaught exception will silently terminate it.

Bye

It is actually the point of my problem.
Is there any way to avoid this behavior ? Because without GDB you are not aware that a thread has just exited.

Your program has to catch all the exceptions. I wrote a small demo for NX (see on my web site) that is called "nx_demo_thread". It is very simplistic regarding thread management but it could help you to see how this program catches the exceptions.

mm

Oki I see you use a double try statement in the execute method.